Head-up display system and method of designing the same

Abstract

The application provides a head-up display system and a design method thereof. The head-up display system comprises a laminated glass and a projection assembly. The laminated glass comprises a first transparent substrate having a first surface and a second surface, a second transparent substrate having a third surface and a fourth surface, and an intermediate bonding layer arranged between the first transparent substrate and the second transparent substrate and used for bonding the second surface and the third surface. The laminated glass has at least one projection display area. The projection display area has a wedge-shaped cross-sectional shape with an upper side edge thickness greater than a lower side edge thickness when the laminated glass is mounted on a vehicle. The projection display area has a section with a wedge angle continuously and nonlinearly monotonously decreasing from the lower side edge to the upper side edge. The ratio of the length of the section to the length of the projection display area is not less than 70%. The projection assembly comprises at least one projection light source capable of projecting onto the at least one projection display area. Projection light emitted by the projection light source is incident on the projection display area to form a projection image.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobiles, in particular to a head-up display system and a design method thereof. BACKGROUND

[0002] With the development of automobile intelligence, head-up display (HUD) systems are increasingly applied to automobiles. The head-up display system displays images, such as driving information, in real time in front of the front windshield. The front windshield is usually a laminated glass, and a middle bonding layer with a wedge angle needs to be set to eliminate the sub-images generated by the projection onto the front windshield. When a high-reflective medium layer is provided in the front windshield, such as a metal coating layer containing Ag, a high-reflectivity modified PET, etc., reflection will also occur and more sub-images will be generated. When the driver sees two or more offset images at the same time, the image observed by the human eye will be blurred, and there will be a sense of dizziness, which is not a good experience. Since the height of each driver is different and more and more automobiles are provided with multiple HUDs with different display distances or functions, the middle bonding layer with a single wedge angle value is not good for reducing the sub-images projected onto the front windshield, thereby resulting in low quality of the head-up display image projected onto the front windshield. SUMMARY

[0003] The present application discloses a head-up display system, which can solve the technical problem of low quality of the head-up display image projected onto the front windshield.

[0004] In a first aspect, the present application provides a head-up display system, which comprises a laminated glass and a projection assembly.

[0005] The laminated glass comprises:

[0006] a first transparent substrate having a first surface and a second surface;

[0007] a second transparent substrate having a third surface and a fourth surface; and

[0008] a middle bonding layer provided between the first transparent substrate and the second transparent substrate and used for bonding the second surface and the third surface;

[0009] The laminated glass has at least one projection display area, the projection display area has a wedge-shaped cross-sectional shape with an upper side thickness greater than a lower side thickness when the laminated glass is installed on a vehicle, the projection display area has a section with a wedge angle continuously and nonlinearly monotonically decreasing from the lower side to the upper side, and the ratio of the length of the section to the length of the projection display area is not less than 70%.

[0010] The projection assembly comprises at least one projection light source capable of projecting to the at least one projection display area, and projection light emitted by the projection light source is incident to the projection display area to form a projection image.

[0011] In a second aspect, the application further provides a design method of a head-up display system, the design method of the head-up display system comprising:

[0012] The projection assembly and the laminated glass are provided, and projection light emitted by the projection assembly is incident to at least one projection display area on the laminated glass;

[0013] An eyebox surface located in the vehicle is determined;

[0014] A virtual image surface is designed;

[0015] The eyebox surface comprises a plurality of sub-eyebox surfaces in turn from high to low, and the virtual image surface comprises a plurality of sub-virtual image surfaces in turn from low to high, wherein each sub-virtual image surface corresponds to a sub-eyebox surface;

[0016] An observation point array is selected on each sub-eyebox surface, and a virtual image point array is selected on each sub-virtual image surface, a line connecting a point in the observation point array and a point in the virtual image point array passes through a corresponding projection display area, and an intersection of the line and the projection display area is an incident point;

[0017] A plurality of first theoretical wedge angle values of the laminated glass when the projection image at the position of the corresponding incident point has no secondary image are calculated according to the projection assembly, the laminated glass and the plurality of lines;

[0018] A first change curve of the wedge angle with the distance of the incident point to the bottom edge of the laminated glass is fitted according to the plurality of first theoretical wedge angle values and the distance of the incident point corresponding to each first theoretical wedge angle value to the bottom edge of the laminated glass; and

[0019] The wedge angle value of the laminated glass at the corresponding projection display area is determined according to the first change curve.

[0020] The head-up display system provided by the application comprises a laminated glass and a projection assembly, the laminated glass can weaken or even eliminate secondary images of each head-up display image formed through a plurality of projection display areas by means of a wedge-shaped cross-sectional shape with a thickness of an upper side greater than a thickness of a lower side and a wedge angle continuously and non-linearly monotonically decreasing from the lower side to the upper side, thereby improving the quality of the head-up display image projected on the laminated glass, and also being conducive to the driver to switch observation between a plurality of head-up display images, further improving driving safety and comfort. Therefore, the head-up display system provided by the application can improve the quality of the head-up display image. BRIEF DESCRIPTION OF DRAWINGS

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a head-up display system provided in one embodiment of this application.

[0023] Figure 2 for Figure 1 A schematic cross-sectional view of the laminated glass along line AA in the head-up display system provided in the implementation method.

[0024] Figure 3 for Figure 1 A schematic diagram of the imaging of the first projected image in the head-up display system provided in the implementation method.

[0025] Figure 4 for Figure 1 The wedge angle variation curve of the laminated glass in the head-up display system provided in the implementation method.

[0026] Figure 5 for Figure 1 A schematic diagram of the structure of the intermediate adhesive layer in the head-up display system provided in the implementation method.

[0027] Figure 6 This is a schematic diagram of the structure of a head-up display system provided in another embodiment of this application.

[0028] Figure 7 This is a schematic diagram illustrating the calculation of the wedge angle value at any point in laminated glass according to an embodiment of this application.

[0029] Figure 8 This is a schematic diagram of the combination of sub-eye box surface and sub-virtual image surface provided in one embodiment of this application.

[0030] Figure 9 This is a schematic diagram of a first variation curve provided for one embodiment of this application.

[0031] Figure 10 A schematic diagram of the fitting curve provided for another embodiment of this application.

[0032] Figure 11 A schematic diagram of the fitting curve provided for another embodiment of this application.

[0033] Figure 12 This is a schematic diagram of the structure of a head-up display system provided in another embodiment of this application.

[0034] Figure 13 for Figure 12The head-up display system according to an embodiment of the present application.

[0035] Figure 14 The head-up display system according to an embodiment of the present application.

[0036] Figure 15 The head-up display system according to an embodiment of the present application. Figure 14 The head-up display system according to an embodiment of the present application.

[0037] Figure 16 The head-up display system according to an embodiment of the present application. Figure 12 The head-up display system according to an embodiment of the present application.

[0038] Figure 17 The head-up display system according to an embodiment of the present application. Figure 12 The head-up display system according to an embodiment of the present application.

[0039] Figure 18 The head-up display system according to an embodiment of the present application. Figure 12 The head-up display system according to an embodiment of the present application.

[0040] Figure 19 The head-up display system according to an embodiment of the present application.

[0041] Figure 20 The head-up display system according to an embodiment of the present application.

[0042] Figure 21 The head-up display system according to an embodiment of the present application.

[0043] Figure 22 The head-up display system according to an embodiment of the present application.

[0044] Figure 23 The head-up display system according to an embodiment of the present application.

[0045] Figure 24 The head-up display system according to an embodiment of the present application.

[0046] Figure 25 The head-up display system according to an embodiment of the present application. Figure 24 The head-up display system according to an embodiment of the present application.

[0047] Figure 26 The head-up display system according to an embodiment of the present application. Figure 24 The head-up display system according to an embodiment of the present application.

[0048] Figure 27 For Figure 24 The schematic diagram of eyebox surface and first virtual image surface in the design method of head-up display system provided by the embodiment.

[0049] Figure 28 The schematic diagram of the first variation curve calculated by the design method of head-up display system provided by the embodiment.

[0050] Figure 29 The schematic diagram of the optimization design of two first variation curves in the design method of head-up display system provided by the embodiment.

[0051] Figure 30 The schematic diagram of the second variation curve calculated by the design method of head-up display system provided by the embodiment.

[0052] Figure 31 The schematic diagram of the optimization of the first variation curve and the second variation curve provided by the embodiment.

[0053] BRIEF DESCRIPTION OF DRAWINGS: head-up display system 1; laminated glass 10; projection assembly 20; first transparent substrate 100; first surface 110; second surface 120; second transparent substrate 200; third surface 210; fourth surface 220; intermediate adhesive layer 300; top edge 10a; bottom edge 10b; projection light source 201; first projection light source 211; second projection light source 212; folding mirror 230; aspheric mirror 240; projection display area 410; lower side edge 420; upper side edge 430; first projection display area 411; second projection display area 412; first projection image 4111; second projection image 4121; first left projection image 4111L; first right projection image 4111R; second left projection image 4121L; second right projection image 4121R; eyebox surface EB10; first virtual image surface TB20; second virtual image surface TB30; sub-eyebox surface EB11; first sub-eyebox surface EB12; second sub-eyebox surface EB13; third sub-eyebox surface EB14; first sub-virtual image surface TB21; first low virtual image surface TB22; first middle virtual image surface TB23; first high virtual image surface TB24; observation point array EB111; first sub-observation point array EB121; second sub-observation point array EB131; third sub-observation point array EB141; first virtual image point array TB211; first low virtual image point array TB221; first middle virtual image point array TB231; first high virtual image point array TB241; second sub-virtual image surface TB31; second virtual image point array TB311; observer's eye E10; first variation curve L1; second variation curve L2; first discrete graph T10; sub-discrete graph T11; first sub-discrete graph T12; second sub-discrete graph T13; third sub-discrete graph T14. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0055] The terms "first", "second", and the like in the specification of the present application, the claims, and the above drawings are used to distinguish different objects, rather than to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device including a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed or can optionally include other steps or units inherent to the process, method, product, or device.

[0056] Reference herein to "an embodiment" or "embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment or embodiments can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, or that it is an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] An embodiment of the present application provides a head-up display system 1. Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 A structural schematic diagram of the head-up display system provided by an embodiment of the present application is shown in FIG. 1. Figure 2 A sectional view along the line A-A of the head-up display system provided by an embodiment is shown in FIG. 2. Figure 1 An imaging schematic diagram of the first projected image in the head-up display system provided by an embodiment is shown in FIG. 3. Figure 3 An imaging schematic diagram of the second projected image in the head-up display system provided by an embodiment is shown in FIG. 4. Figure 1 An imaging schematic diagram of the third projected image in the head-up display system provided by an embodiment is shown in FIG. 5. Figure 4 An imaging schematic diagram of the fourth projected image in the head-up display system provided by an embodiment is shown in FIG. 6. Figure 1The wedge angle variation curve of the laminated glass in the head-up display system is provided. The head-up display system 1 comprises a laminated glass 10 and a projection assembly 20. The laminated glass 10 comprises a first transparent substrate 100, a second transparent substrate 200 and an interlayer 300. The first transparent substrate 100 has a first surface 110 and a second surface 120. The second transparent substrate 200 has a third surface 210 and a fourth surface 220. The interlayer 300 is arranged between the first transparent substrate 100 and the second transparent substrate 200, and is used to bond the second surface 120 and the third surface 210. The laminated glass 10 has at least one projection display area 410. The projection display area 410 has a wedge-shaped cross-sectional shape with the thickness of the upper side 430 being greater than the thickness of the lower side 420 when the laminated glass 10 is installed on a vehicle.

[0058] The projection display area 410 has a section with the wedge angle continuously and non-linearly monotonically decreasing from the lower side 420 to the upper side 430, and the ratio of the length of the section to the length of the projection display area 410 is not less than 70%. It can be understood that, in the projection display area 410, the wedge angle of other sections except the section can be equal to 0, can be a constant wedge angle, can be linearly increased or linearly decreased, or can continuously and non-linearly monotonically decrease together with the wedge angle of the section. Preferably, the ratio of the length of the section to the length of the projection display area 410 is not less than 75%, or not less than 80%, or not less than 85%, or not less than 90%, or not less than 95%, or equal to 100%. Preferably, the wedge angle of each projection display area 410 continuously and non-linearly monotonically decreases from the lower side 420 to the upper side 430. The length is measured in the direction from the lower side 420 to the upper side 430.

[0059] For example, the projection display area 410 comprises at least one first projection display area 411. The projection assembly 20 comprises at least one projection light source 201 projecting to the plurality of projection display areas 410, and the projection light emitted by the projection light source 201 forms a first projection image 4111 incident to the first projection display area 411.

[0060] In the present embodiment, the head-up display system 1 is applied to information display on the front windshield of a vehicle. The head-up display system 1 comprises a projection assembly 20, and the image projected by the projection assembly 20 to the plurality of projection display areas 410 comprises at least one of a plurality of types of HUD images, a plurality of angles of HUD images, and a plurality of display distances of HUD images, so that the head-up display system 1 has the function of multi-information display, and the richness of image display of the head-up display system 1 is increased. The plurality of projection display areas 410 are used to display HUD images, and specifically, the plurality of projection display areas 410 can be used to set up an augmented reality head-up display (AR-HUD) or a windshield head-up display (W-HUD), etc.

[0061] In the present embodiment, the projection assembly 20 comprises at least one projection light source 201 projecting to the plurality of projection display areas 410. One projection light source 201 corresponds to one projection display area 410, or one projection light source 201 corresponds to a plurality of projection display areas 410. In an embodiment, the projection light source 201 emits light rays directly projecting to the projection display area 410. In another embodiment, the projection light emitted by the projection assembly 20 is projected to the projection display area 410 through a reflection device.

[0062] In the embodiment, the wedge angle of the laminated glass 10 in the plurality of projection display areas 410 is used to eliminate the secondary image when the projection light emitted by the projection assembly 20 is incident to the plurality of projection display areas 410 to form a projection image. Specifically, the laminated glass 10 is exemplarily described as applied to a vehicle. When the projection assembly 20 projects the light forming the first projection image 4111 to the projection display area 410, due to the thickness of the laminated glass 10, the image of the light reflected on the first transparent substrate 100 to the observer's eye E10 located in the driver's cabin and the image of the light reflected on the second transparent substrate 200 to the observer's eye E10 exist secondary images. When the laminated glass 10 further has a high-reflective medium layer, such as a metal coating layer containing Ag, a modified PET with high reflectivity, etc., reflection will also occur and more secondary images will be generated. In order to eliminate the secondary image, the laminated glass 10 needs to set a corresponding wedge angle in the plurality of projection display areas 410, so that the secondary image coincides with the primary image, and then the observer can see the first projection image 4111 without secondary image through the projection display area 410. Since the light reflected into the observer's eye E10 of the first projection image 4111 on different areas of the plurality of projection display areas 410 has different angles, and the observer in the driver's cabin will also make the light of the first projection image 4111 entering the observer's eye E10 have different angles due to different sitting positions. Therefore, the laminated glass 10 needs to set different wedge angle values on different areas of the plurality of projection display areas 410.

[0063] In the embodiment (please refer to Figure 4 ), each of the projection display areas 410 has a wedge-shaped cross-sectional shape when the laminated glass 10 is installed on a vehicle, in which the thickness of the upper side 430 is greater than the thickness of the lower side 420, and the wedge angle continuously and non-linearly monotonically decreases from the lower side 420 to the upper side 430. For example, the wedge angle of the laminated glass 10 in each of the projection display areas 410 presents a second-order to fifth-order function non-linear gradual decrease in the direction from the lower side 420 to the upper side 430. Figure 4 The first variation curve L1 is a curve showing the change of the wedge angle of the laminated glass 10 in one of the projection display areas 410 with the distance to the bottom edge 10b of the laminated glass 10. The wedge angle of the laminated glass 10 corresponding to each of the projection display areas 410 non-linearly gradually decreases in the direction from the lower side 420 to the upper side 430, so as to weaken or even eliminate the problem of secondary image of the heads-up display image in each of the projection display areas 410.

[0064] In the prior art, the wedge angle change of the laminated glass 10 in the plurality of projection display areas 410 is only a linear segment splicing design of several wedge angle values, or based on this, a simple arc transition is made at the bending position of the spliced linear segment, which cannot solve the problem of the multiple area head-up display image sub-images in the plurality of projection display areas 410.

[0065] Compared with the prior art, the head-up display system provided by the embodiments of the present application includes a laminated glass 10 and a plurality of projection assemblies 20, the laminated glass 10 can weaken or even eliminate the sub-image of each head-up display image formed by at least one projection display area 410 through the wedge-shaped cross-sectional shape that the thickness of the upper side 430 is greater than the thickness of the lower side 420, and the wedge angle continuously and monotonically decreases from the lower side 420 to the upper side 430, thereby improving the quality of the head-up display image projected onto the laminated glass 10, and also being beneficial to the driver to switch between the plurality of head-up display images, further improving the driving safety and comfort. The head-up display system provided by the present application can improve the quality of the head-up display image.

[0066] Please refer again to Figure 4 In the embodiments, the maximum change rate ROC of the wedge angle continuously and monotonically decreasing in the projection display area 410 is ROC: ROC≤0.3 mrad / 100 mm. Or, ROC≤0.2 mrad / 100 mm. Or, ROC≤0.1 mrad / 100 mm. Or, ROC≤0.05 mrad / 100 mm.

[0067] In the embodiments, Figure 4L1 is a curve of the wedge angle of the laminated glass 10 in each of the projection display areas 410 with respect to the distance to the bottom edge 10b of the laminated glass 10. K1 is a tangent of L1 at a certain point, and the slope of the tangent represents the absolute value of the rate of change of the wedge angle at the position of the point. If the maximum rate of change of the wedge angle of the laminated glass 10 is too large, the production difficulty and production cost of the laminated glass 10 are increased, which is not conducive to the production efficiency of the laminated glass 10, thereby affecting the production efficiency of the laminated glass 10. Therefore, the maximum rate of change of the wedge angle of the laminated glass 10 should not be too large. Specifically, the maximum rate of change ROC of the wedge angle continuously and non-linearly monotonously decreasing from the lower side 420 to the upper side 430 in the plurality of projection display areas 410: ROC≤0.3 mrad / 100 mm. Preferably, the maximum rate of change ROC of the wedge angle continuously and non-linearly monotonously decreasing from the lower side 420 to the upper side 430 in the plurality of projection display areas 410: ROC≤0.2 mrad / 100 mm. More preferably, the maximum rate of change ROC of the wedge angle continuously and non-linearly monotonously decreasing from the lower side 420 to the upper side 430 in the plurality of projection display areas 410: ROC≤0.1 mrad / 100 mm. More preferably, the maximum rate of change ROC of the wedge angle continuously and non-linearly monotonously decreasing from the lower side 420 to the upper side 430 in the plurality of projection display areas 410: ROC≤0.05 mrad / 100 mm.

[0068] Please refer again to Figure 4 In the embodiment, the maximum wedge angle a of the laminated glass 10 in the plurality of projection display areas 410: a≤0.8 mrad.

[0069] In the embodiment, Figure 4 a in the formula is the maximum wedge angle of the laminated glass 10 in the plurality of projection display areas 410. If the wedge angle of the laminated glass 10 is too large, the local area of the laminated glass 10 is too thick, which increases the difficulty of eliminating the sub-image of the head-up display image on the plurality of projection display areas 410. In addition, the wedge angle of the laminated glass 10 is too large, which easily leads to a large rate of change of the wedge angle of the laminated glass 10, thereby increasing the production difficulty and production cost of the laminated glass 10, which is not conducive to the production efficiency of the laminated glass 10. Therefore, the wedge angle of the laminated glass 10 should not be too large. Specifically, the maximum wedge angle a of the laminated glass 10 in the plurality of projection display areas 410: a≤0.8 mrad.

[0070] In the present application, the wedge angle in the plurality of projection display areas 410 can be provided by the intermediate bonding layer 300 only, i.e., the first transparent substrate 100 and the second transparent substrate 200 are both in the shape of equal thickness (the wedge angle is equal to 0), and the wedge angle of the projection display area 410 is equal to the wedge angle of the intermediate bonding layer 300; or the wedge angle in the plurality of projection display areas 410 can be provided by the intermediate bonding layer 300 and the first transparent substrate 100 and / or the second transparent substrate 200, i.e., the first transparent substrate 100 and / or the second transparent substrate 200 are also in the shape of wedge, and considering the production difficulty of the first transparent substrate 100 and / or the second transparent substrate 200, the wedge angle of the first transparent substrate 100 and / or the second transparent substrate 200 is selected as a constant wedge angle, and the wedge angle of the projection display area 410 is equal to the sum of the wedge angle of the intermediate bonding layer 300 and the wedge angle of the first transparent substrate 100 and / or the second transparent substrate 200.

[0071] Please refer to Figure 5 , Figure 5 for Figure 1 the structure diagram of the intermediate bonding layer in the head-up display system provided in the embodiments. In the present embodiment, the maximum thickness h of the intermediate bonding layer 300 is: 0.38mm≤h≤1.6mm.

[0072] In the present embodiment, the thickness of the laminated glass 10 is related to the thickness of the intermediate bonding layer 300, i.e., the thicker the thickness of the intermediate bonding layer 300 is, the thicker the thickness of the laminated glass 10 is. Since the thicker the laminated glass 10 is, the more serious the secondary image formed by the head-up display image projected to the plurality of projection display areas 410 is, thereby increasing the difficulty of producing the laminated glass 10 capable of weakening the secondary image formed by the head-up display image projected to the plurality of projection display areas 410, therefore, the laminated glass 10 is not too thick, i.e., the maximum thickness of the intermediate bonding layer 300 is not too thick. Specifically, the maximum thickness h of the intermediate bonding layer 300 is: h≤1.6mm. In addition, the laminated glass 10 needs to meet the penetration resistance and impact resistance requirements in the regulatory requirements, i.e., the maximum thickness of the intermediate bonding layer 300 is not too thin. Specifically, the maximum thickness h of the intermediate bonding layer 300 is: h≥0.38mm. Therefore, the thickness h of the intermediate bonding layer 300 is: 0.38mm≤h≤1.6mm.

[0073] In an embodiment, each point in the segment has a measured wedge angle, the measured wedge angles of each point in the segment are fitted to obtain an actual wedge angle fitting curve, each point in the projection display area has a plurality of theoretical wedge angle values capable of eliminating the secondary image, the plurality of theoretical wedge angle values of each point in the projection display area are fitted to obtain a first change curve L1, and the maximum deviation value of the corresponding part of the actual wedge angle fitting curve and the first change curve L1 is less than or equal to 0.15mrad.

[0074] In particular, reference is made to Figure 6 , Figure 6 The structure schematic diagram of the head-up display system provided by another embodiment of the present application. The projection assembly 20 further comprises a folding mirror 230 and an aspheric mirror 240. When the first projection light source 211 works, the first projection light source 211 converts information such as vehicle speed, navigation, etc. into a light signal, and emits the light signal to the fourth surface 220 of the second transparent substrate 200 of the laminated glass 10 through the folding mirror 230 and the aspheric mirror 240, and reflects to the corresponding eyebox surface EB10 through the laminated glass 10, so as to form a first virtual image on the first virtual image surface TB20 in front of the laminated glass 10, and form a first virtual image, which is called a main image.

[0075] It should be noted that the virtual image surface at least comprises the first virtual image surface TB20, and when there are multiple projection display areas 410, the virtual image surface can further comprise a second virtual image surface TB30. The present application takes the first virtual image surface TB20 as an example for illustration, and the case of multiple virtual image surfaces can be deduced by referring to the characteristics of the first virtual image surface TB20.

[0076] It can be understood that the light path of each light ray emitted by the first projection light source 211 is unique, that is, when observed at different positions of the same eyebox surface EB10, the observed light path of the light ray emitted by the first projection light source 211 is different, and the projection area of these light rays on the laminated glass 10 can be equivalent to the first projection display area 411 of the laminated glass 10.

[0077] In the present embodiment, since the laminated glass 10 is a transparent medium, the light ray emitted by the first projection light source 211 will be reflected again into the eyebox surface EB10 on the outer surface of the laminated glass 10 after entering the laminated glass 10, and form a second virtual image in front of the laminated glass 10. When a high-reflective medium layer is provided in the laminated glass 10, such as a metal coating layer containing Ag, a modified PET with high reflectivity, etc., a third or even more virtual images will also be reflected and generated; the second, third or more virtual images are collectively referred to as a secondary image. In order to eliminate the secondary image, a corresponding wedge angle is provided in the laminated glass 10, which can make the secondary image completely overlap with the main image, i.e. the theoretical wedge angle value. It can be understood that the light rays emitted by the first projection light source 211 are different, and the theoretical wedge angle value required to eliminate the secondary image is also different, so different wedge angles need to be provided at different positions in the laminated glass 10, that is, at any position on the laminated glass 10 away from the bottom edge 10b, the theoretical wedge angle value required to eliminate the secondary image is within a certain interval, and there is a maximum theoretical wedge angle and a minimum theoretical wedge angle.

[0078] Referring to Figure 7 , Figure 7 The wedge angle value calculation diagram of the laminated glass provided in an embodiment of the present application is shown in FIG. 2. It can be understood that the wedge angle value of any point of the laminated glass 10 reflects the thickness variation rate of the laminated glass 10 at the point. As shown in FIG. 2, assuming that the thickness of a point of the laminated glass 10 is t1, and the thickness of a point which is at a distance H from the point along the extension direction of the bottom edge 10b of the laminated glass 10 to the top edge 10a of the laminated glass 10 is t2, the wedge angle value β of the point can be calculated according to the formula β = arctan((t2-t1) / H), wherein H tends to be infinitely small. Figure 7

[0079] In the embodiment, referring to Figure 8 , Figure 8 The combination diagram of the sub-eyebox surface and the sub-virtual image surface provided in an embodiment of the present application is shown in FIG. 3. The eyebox surface EB10 includes a plurality of sub-eyebox surfaces EB11 in turn from high to low, and the first virtual image surface TB20 includes a plurality of first sub-virtual image surfaces TB21 in turn from low to high, wherein each first sub-virtual image surface TB21 corresponds to a sub-eyebox surface EB11. An observation point array EB111 is selected on each sub-eyebox surface EB11, and a first virtual image point array TB211 is selected on each first sub-virtual image surface TB21, the line connecting a point in the observation point array EB111 and a point in the first virtual image point array TB211 passes through the corresponding first projection display area 411, and the intersection of the line and the first projection display area 411 is an incident point. A plurality of first theoretical wedge angle values of the laminated glass 10 when the first projection image 4111 has no secondary image are calculated according to the projection assembly 20, the laminated glass 10 and the plurality of lines. According to the plurality of first theoretical wedge angle values and the distance from the incident point corresponding to each first theoretical wedge angle value to the bottom edge 10b of the laminated glass, a first change curve L1 of the wedge angle with the distance from the incident point to the bottom edge 10b of the laminated glass is fitted. Further, the wedge angle value of the laminated glass 10 at the corresponding first projection display area 411 can be determined according to the first change curve L1.

[0080] ​It can be understood that the eyebox surface EB10 is used to simulate the position of the human eye or visual system observing the projected picture, and the first virtual image surface TB20 represents the position of the projected light rays emitted by the first projection light source 211. The size of the first virtual image surface TB20 is usually represented by width*height, for example, 400mm*200mm. Since the height and sitting posture of each person may be different, the positions of the three sub-eyebox surfaces EB11 (Tall, Mid, and Short) are analyzed, and then the three first sub-virtual image surfaces TB21 corresponding to the upper, middle, and lower sub-eyebox surfaces EB11 are formed to form three combinations of the lower sub-eyebox surface EB11-upper first sub-virtual image surface TB21, the middle sub-eyebox surface EB11-middle first sub-virtual image surface TB21, and the upper sub-eyebox surface EB11-lower first sub-virtual image surface TB21. It can be understood that the light path of the line connecting two points on the corresponding sub-eyebox surface EB11 and the corresponding first sub-virtual image surface TB21 will form three different areas in the first projection display area 411.

[0081] Specifically, please refer to Figure 9 , Figure 9 The first variation curve diagram provided by an embodiment of the present application. In this embodiment, a plurality of sample points are selected on the sub-eyebox surface EB11 and the corresponding first sub-virtual image surface TB21, respectively. A common method is to divide the sub-eyebox surface EB11 and the first sub-virtual image surface TB21 into equally spaced grid point arrays m*n and i*j, respectively. For example, the sub-eyebox surface EB11 is divided into a 5*3 point array, and the first sub-virtual image surface TB21 is also divided into a 5*3 point array.

[0082] Specifically, the light path of the line connecting two points on the sub-eyebox surface EB11 and the corresponding first sub-virtual image surface TB21 intersects in the corresponding area of the first projection display area 411 to obtain a data point. CAD software can be used to solve the problem, and common professional optical simulation software such as ANSYS SPEOS, ZEMAX, or DASSAULT SYSTEM CATIA can be used to simulate and calculate the theoretical wedge angle value required to eliminate the secondary image for any single beam of light. It can be understood that, according to the distance from the data points in the different first projection display areas 411 to the bottom edge 10b of the laminated glass 10 and the theoretical wedge angle value required to eliminate the secondary image, a wedge angle scatter data set as shown in Figure 9 can be established, wherein the Tall wedge angle scatter data set corresponds to the combination of the upper sub-eyebox surface EB11-lower first sub-virtual image surface TB21, the Mid wedge angle scatter data set corresponds to the combination of the middle sub-eyebox surface EB11-middle first sub-virtual image surface TB21, and the Short wedge angle scatter data set corresponds to the combination of the lower sub-eyebox surface EB11-upper first sub-virtual image surface TB21.

[0083] Depend on Figure 9 As shown, the theoretical wedge angle values ​​required to eliminate secondary images within each region of each wedge angle scatter plot data set exhibit a discrete state with a certain regularity. At a certain position relative to the bottom edge 10b of the laminated glass 10, different light rays correspond to different required wedge angle values. For example, at a distance of 420mm from the bottom edge 10b, the required wedge angle value is between 0.30mrad and 0.50mrad. Obviously, there can only be one wedge angle value for the laminated glass 10 at the same position, and the theoretical wedge angle value required to eliminate secondary images will fall within the range of the wedge angle scatter plot data set at that position. Based on the theoretical wedge angle values ​​corresponding to each position of the laminated glass 10 in the wedge angle scatter plot data set, a variable wedge angle curve can be fitted. This curve runs through the wedge angle scatter plot data set and is characterized as a continuously nonlinear monotonically decreasing wedge angle value.

[0084] In this embodiment, to ensure the effectiveness of the wedge angle in eliminating secondary images, it is understood that the maximum deviation between the actual wedge angle fitting curve and the corresponding portion of the first variation curve L1 is less than or equal to 0.15 mrad. Specific examples include ≤0.15 mrad, ≤0.14 mrad, ≤0.13 mrad, ≤0.12 mrad, ≤0.11 mrad, ≤0.10 mrad, ≤0.09 mrad, ≤0.08 mrad, ≤0.07 mrad, ≤0.06 mrad, and ≤0.05 mrad. Furthermore, in fitting the entire first variation curve L1 from the bottom edge 10b to the top edge 10a of the laminated glass 10, appropriate fine-tuning can be made within the tolerance range for each segment of the first variation curve L1 to fit a complete first variation curve L1. That is, the final complete first variation curve L1 may not completely coincide with the curve fitted by the optimal variable wedge angle for each segment.

[0085] In one embodiment, the actual wedge angle fitting curve and the first variation curve L1 both conform to a 2nd-5th order function.

[0086] Understandably, in this embodiment, by fitting the measured wedge angle at each point location with a 2nd-5th order function to obtain the actual wedge angle fitting curve, and by fitting the maximum theoretical wedge angle and the minimum theoretical wedge angle at each point location with a 2nd-5th order function to obtain the first variation curve L1, the maximum deviation between the corresponding part of the actual wedge angle fitting curve and the first variation curve L1 is less than or equal to 0.15 mrad, thereby improving the technical problem of excessively large differences in wedge angle values ​​at different positions of the laminated glass 10.

[0087] In one embodiment, please refer to the following: Figure 10 , Figure 10A fitting curve provided by another embodiment of the present application is shown in the figure. The slope of the tangent line at any point on the fitting curve continuously decreases from the lower side 420 to the upper side 430. The slope of the tangent line at any point on the fitting curve represents the absolute value of the rate of change of the wedge angle at the position of the point. Understandably, according to the wedge angle scatter point data set described above, a fitting curve, i.e. a concave curve, as shown in the figure can be fitted to manufacture different specifications of the laminated glass 10 to adapt to different vehicles, which is not limited by the present application. Figure 10

[0088] In an embodiment, please refer to Figure 11 , Figure 11 A fitting curve provided by another embodiment of the present application is shown in the figure. The slope of the tangent line at any point on the fitting curve continuously increases from the lower side 420 to the upper side 430. The slope of the tangent line at any point on the fitting curve represents the absolute value of the rate of change of the wedge angle at the position of the point. Understandably, according to the wedge angle scatter point data set described above, a fitting curve, i.e. a convex curve, as shown in the figure can be fitted to manufacture different specifications of the laminated glass 10 to adapt to different vehicles, which is not limited by the present application. Figure 11

[0089] In an embodiment, please refer to Figure 9 , the slope of the tangent line at any point on the fitting curve continuously increases from the lower side 420 to the upper side 430 and then continuously decreases. The slope of the tangent line at any point on the fitting curve represents the absolute value of the rate of change of the wedge angle at the position of the point. Understandably, according to the wedge angle scatter point data set described above, a fitting curve, i.e. an S-shaped curve, as shown in the figure can be fitted to manufacture different specifications of the laminated glass 10 to adapt to different vehicles, which is not limited by the present application. Figure 9

[0090] In an embodiment, the ratio of the maximum local range value AW of the plurality of theoretical wedge angle values to the overall range value AC of the plurality of theoretical wedge angle values is: AW / AC≤0.9.

[0091] Specifically, please refer to Figure 9 ​​​When the wedge angle of the laminated glass 10 is fixed, i.e. the wedge angle values of different positions of the laminated glass 10 are the same, for example, 0.38 mrad is selected as the fixed wedge angle value. In the present embodiment, it should be noted that in the scatter plot of the theoretical wedge angle values, the local range value in the wedge angle scatter data set is the difference between the maximum theoretical wedge angle and the minimum theoretical wedge angle at a position with a distance X from the bottom edge 10b of the laminated glass 10, and the maximum local range value AW is the maximum value in the local range values. The overall range value AC of the plurality of theoretical wedge angle values is the difference between the maximum value and the minimum value in all the theoretical wedge angle values in the scatter plot.

[0092] When the maximum local range value of the wedge angle scatter data set at the corresponding position of the laminated glass 10 is less than the maximum overall range value of the wedge angle scatter data set, i.e. d2+d2' < d1+d1', the parallax elimination effect of the laminated glass 10 with variable wedge angle is better than that of the laminated glass 10 with fixed wedge angle.

[0093] Alternatively, the ratio of the maximum local range value AW of the wedge angle scatter data set at the corresponding position of the laminated glass 10 to the overall range value AC of the wedge angle scatter data set is less than or equal to 0.9, i.e. AW / AC≤0.9, and specific examples include 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, etc. It can be understood that based on this, the present application improves the dispersion state of the wedge angle scatter data set, reduces the maximum local range value of the wedge angle scatter data set at the corresponding position of the laminated glass 10, and can improve the parallax elimination effect of the laminated glass 10.

[0094] In the present embodiment, please refer to Figure 6 , the projection display area 410 includes at least one first projection display area 411. The projection light emitted by the projection assembly 20 forms a first projection image 4111 with a virtual image distance of 7-100 meters, i.e. the distance between the first projection image 4111 and the eye box surface EB10 of the observer is 7-100 meters. Specifically, the first projection display area 411 is used for AR-HUD image display.

[0095] Please refer to Figure 12 and Figure 13 , Figure 12 is a structure schematic view of the head-up display system provided in another embodiment of the present application; Figure 13 is Figure 12A schematic diagram of a head-up display system provided in this embodiment, showing projection onto a second projection display area. In this embodiment, the plurality of projection display areas 410 further includes at least one second projection display area 412. The projection light emitted by the projection light source 201 is incident on the second projection display area 412 to form a second projection image 4121, and the virtual image distance of the second projection image 4121 is 1 meter to 6 meters.

[0096] In this embodiment, the first projection display area 411 is used for long-distance projection display. Specifically, the first projection display area 411 is used to fuse display information with the real scene, and to project complex graphics corresponding to objects in the real world, realizing interaction between road conditions, vehicles, and drivers. The second projection display area 412 is used for short-distance projection display. Specifically, the second projection display area 412 is used to display vehicle operating parameter information at close range, which can reduce the need to look down at the dashboard or related information, facilitate the driver's switching between near and far vision, maximize the driver's attention while driving, and improve driving safety.

[0097] Please refer to Figure 14 , Figure 14 This is a schematic diagram of a head-up display system provided in another embodiment of this application. In this embodiment, the plurality of projection components 20 include at least one first projection light source 211 and at least one second projection light source 212. The projection light emitted by the first projection light source 211 is incident on the first projection display area 411. The projection light emitted by the second projection light source 212 is incident on the second projection display area 412.

[0098] In this embodiment, the first projection light source 211 is used to project onto the first projection display area 411 for long-distance projection display. Specifically, the first projection display area 411 is used to display information fused with the real scene, and to project complex graphics corresponding to objects in the real world, realizing interaction between road conditions, vehicles, and drivers. The second projection light source 212 is used to project onto the second projection display area 412 for short-distance projection display. Specifically, the second projection display area 412 is used to display vehicle operating parameter information at close range, which can reduce the need to look down at the dashboard or related information, facilitate the driver's switching between near and far vision, maximize the driver's attention while driving, and improve driving safety.

[0099] Please refer to Figure 15 , Figure 15 for Figure 14 A schematic diagram of the head-up display system provided in this embodiment from another perspective. In this embodiment, the first projection light source 211 is disposed near the top edge 10a of the laminated glass 10, and the second projection light source 212 is disposed near the bottom edge 10b of the laminated glass 10.

[0100] In the embodiment, the first projection light source 211 is arranged close to the top edge 10a of the laminated glass 10, so that the projection light rays of the first projection light source 211 incident to the first projection display area 411 can keep the optimal incident angle. Specifically, the first projection light source 211 is installed on the inner surface of the roof of the vehicle. The second projection light source 212 is arranged close to the bottom edge 10b of the laminated glass 10, so that the projection light rays of the second projection light source 212 incident to the second projection display area 412 can keep the optimal incident angle. Specifically, the second projection light source 212 is installed in the interior of the instrument panel of the vehicle.

[0101] Please refer to Figure 12 and Figure 16 , Figure 16 as Figure 12 In the embodiment, the first projection image 4111 has a first lower view angle LDA1 and a first virtual image distance VID1, and the second projection image 4121 has a second lower view angle LDA2 and a second virtual image distance VID2. When the first projection display area 411 and the second projection display area 412 are arranged adjacent in the direction that the bottom edge 10b points to the top edge 10a, LDA1 and LDA2 satisfy: 2°≤LDA1-LDA2≤4.5°, or 2.5°≤LDA1-LDA2≤3.5°, and VID1 and VID2 satisfy: 2≤VID1 / VID2≤50, or 2.5≤VID1 / VID2≤10.

[0102] In the embodiment, the eyes of the observer need to switch between the first projection display area 411 and the second projection display area 412 during driving. If the first downward angle LDA1 between the line connecting the first projection image 4111 and the eye E10 of the observer and the horizontal plane and the second downward angle LDA2 between the line connecting the second projection image 4121 and the eye E10 of the observer and the horizontal plane are too different, the angle of rotation of the eyes of the observer during switching between the first projection image 4111 and the second projection image 4121 is too large, which causes the eyes of the observer to be tired after switching between the first projection image 4111 and the second projection image 4121 for multiple times, thereby affecting driving. When the midpoint of the first projection image 4111 and the second projection image 4121 is below the eyes of the observer, the first downward angle LDA1 and the second downward angle LDA2 are negative values. If the first downward angle LDA1 between the line connecting the first projection image 4111 and the eye E10 of the observer and the horizontal plane and the second downward angle LDA2 between the line connecting the second projection image 4121 and the eye E10 of the observer and the horizontal plane are too small, the first projection image 4111 and the second projection image 4121 have too much overlapping part, which interferes with the display of information contained in the first projection image 4111 and the second projection image 4121, thereby affecting the driving of the observer. Therefore, the difference between the first downward angle LDA1 and the second downward angle LDA2 should not be too large, specifically, 2°≤LDA1-LDA2≤4.5°, and specific examples can be 2°, 2.5°, 2.8°, 3°, 3.2°, 3.5°, 3.8°, 4.0°, 4.5°, etc. Preferably, 2.5°≤LDA1-LDA2≤3.5°, and specific examples can be 2.5°, 2.6°, 2.7°, 2.8°, 2.9°, 3°, 3.1°, 3.2°, 3.3°, 3.4°, 3.5°, etc.

[0103] In the embodiment, the ratio between the first virtual image distance VID1 between the first projected image 4111 and the observer's eye E10 and the second virtual image distance VID2 between the second projected image 4121 and the observer's eye E10 needs to be kept within a certain range. If the ratio between the first virtual image distance VID1 and the second virtual image distance VID2 is too small, it will increase the difficulty of design and make it more difficult to eliminate the secondary images of the first projected image 4111 and the second projected image 4121 at the same time. If the ratio between the first virtual image distance VID1 and the second virtual image distance VID2 is too large, it will increase the difficulty of production of the intermediate bonding layer and the laminated glass. Therefore, the difference between the first virtual image distance VID1 and the second virtual image distance VID2 needs to be kept within a certain range, and specifically, the relationship between the first virtual image distance VID1 and the second virtual image distance VID2 is: 2≤VID1 / VID2≤50, preferably 2.5≤VID1 / VID2≤10.

[0104] Please refer again to Figure 16 In the embodiment, -6°≤LDA1≤0°, -8°≤LDA2≤-3°.

[0105] In the embodiment, the angle between the line connecting the virtual image formed by the projection onto the laminated glass 10 and the observer's eye E10 and the horizontal plane will affect the position of the virtual image formed by the projection onto the laminated glass 10 in front of the vehicle. Specifically, the larger the first downward viewing angle LDA1, the closer the virtual image of the first projected image 4111 to the top of the vehicle, and the larger the first virtual image distance VID1. Therefore, if the first downward viewing angle LDA1 is too small, the first projected image 4111 will coincide with the body part of the vehicle in front of the laminated glass 10, causing the first projected image 4111 to be submerged in the vehicle and affecting the observation of the first projected image 4111 by the observer. If the first downward viewing angle LDA1 is too large, the first projected image 4111 will be displayed in the sky, making it difficult for the first projected image 4111 to interact with the entity information outside the vehicle, thereby reducing the information transmission quality of the first projected image 4111. Therefore, the first downward viewing angle LDA1 needs to be kept at an appropriate angle. Specifically, the first downward viewing angle LDA1 is: -6°≤LDA1≤0°.

[0106] In the present embodiment, if the second lower viewing angle LDA2 is too small, the second projected image 4121 will coincide with the body portion of the vehicle in front of the laminated glass 10, so that the second projected image 4121 is submerged in the vehicle, affecting the observation of the second projected image 4121 by the observer. If the second lower viewing angle LDA2 is too large, the second projected image 4121 will have too much overlap with the first projected image 4111, so that the first projected image 4111 is difficult to interactively display with the entity information outside the vehicle, and the information transmission quality of the second projected image 4121 is affected. Therefore, the second lower viewing angle LDA2 needs to be kept at an appropriate angle. Specifically, the second lower viewing angle LDA2: -8°≤LDA1≤-3°.

[0107] Please refer to Figure 12 and Figure 17 , Figure 17 as Figure 12 the present embodiment. In the present embodiment, the plurality of projection display areas 410 include at least two first projection display areas 411. Two first projection display areas 411 adjacent in the horizontal direction are respectively formed with a first left projected image 4111L and a first right projected image 4111R, the first left projected image 4111L has a first left lower viewing angle LDA11 and a first left virtual image distance VID11, and the first right projected image 4111R has a first right lower viewing angle LDA12 and a first right virtual image distance VID12, LDA11 and LDA12 satisfy: 0°≤|LDA11-LDA12|≤1°, and VID11 and VID12 satisfy: 0.5≤VID11 / VID12≤2, or 0.8≤VID11 / VID12≤1.2.

[0108] In the embodiment, when there are two first projection display areas 411 arranged adjacent to each other in the horizontal direction, the eyes of the observer need to switch between the two first projection display areas 411 arranged adjacent to each other during driving. If the first left downward angle LDA11 between the line connecting the first left projection image 4111L and the eye E10 of the observer and the horizontal plane and the first right downward angle LDA12 between the line connecting the first right projection image 4111R and the eye E10 of the observer and the horizontal plane are too different, the angle of rotation of the eyes of the observer required for switching between the first left projection image 4111L and the first right projection image 4111R will be too large, which will cause the eyes of the observer to be tired after switching between the first left projection image 4111L and the first right projection image 4111R for many times, thereby affecting driving. If the first left downward angle LDA11 between the line connecting the first left projection image 4111L and the eye E10 of the observer and the horizontal plane and the first right downward angle LDA12 between the line connecting the first right projection image 4111R and the eye E10 of the observer and the horizontal plane are too similar, the first left projection image 4111L and the first right projection image 4111R will have too much overlapping part, thereby interfering with the display of information contained in the first left projection image 4111L and the first right projection image 4111R, and further affecting the driving of the observer. Therefore, the difference between the first left downward angle LDA11 and the first right downward angle LDA12 should not be too large, specifically, 0°≤|LDA11-LDA12|≤1°. It should be noted that the first end refers to the end of the laminated glass 10 close to the driver's seat in the vehicle.

[0109] In the embodiment, the ratio between the first left virtual image distance VID11 and the first right virtual image distance VID12 needs to be kept within a certain range. If the ratio between the first left virtual image distance VID11 and the first right virtual image distance VID12 is too large, the observer's eyes E10 will be more obvious and more likely to cause eye fatigue when switching between the first left projection image 4111L and the first right projection image 4111R. In addition, if the ratio between the first left virtual image distance VID11 and the first right virtual image distance VID12 is too large, the wedge angle difference between the two first projection display areas 411 of the laminated glass 10 arranged adjacent in the horizontal direction will be too large, which will increase the design and production difficulty of the laminated glass 10. Therefore, the ratio between the first left virtual image distance VID11 and the first right virtual image distance VID12 needs to be kept within a certain range, specifically, the relationship between the first left virtual image distance VID11 and the first right virtual image distance VID12 is: 0.5≤VID11 / VID12≤2, preferably, 0.8≤VID11 / VID12≤1.2.

[0110] Please refer to Figure 12 and Figure 18 , Figure 18 as Figure 12 the projection imaging schematic diagram of another embodiment of the head-up display system provided by the embodiment. In the embodiment, the plurality of projection display areas 410 further include at least two second projection display areas 412, two second projection display areas 412 arranged adjacent in the horizontal direction form a second left projection image 4121L and a second right projection image 4121R respectively, the second left projection image 4121L has a second left down view angle LDA21 and a second left virtual image distance VID21, the second right projection image 4121R has a second right down view angle LDA22 and a second right virtual image distance VID22, LDA21 and LDA22 satisfy: 0°≤|LDA21-LDA22|≤1°, the relationship between VID21 and VID22 is: 0.5≤VID21 / VID22≤2, or 0.8≤VID21 / VID22≤1.2.

[0111] In the embodiment, when there are two second projection display areas 412 arranged adjacent to each other in the horizontal direction, the eyes of the observer need to switch between the two second projection display areas 412 arranged adjacent to each other during driving. If the second left downward viewing angle LDA21 between the line connecting the second left projection image 4121L and the eye E10 of the observer and the horizontal plane and the second right downward viewing angle LDA22 between the line connecting the second right projection image 4121R and the eye E10 of the observer and the horizontal plane are too different, the angle of rotation of the eyes of the observer required for switching between the second left projection image 4121L and the second right projection image 4121R will be too large, and thus the eyes of the observer will be tired after switching between the second left projection image 4121L and the second right projection image 4121R for many times, thereby affecting driving. If the second left downward viewing angle LDA21 and the second right downward viewing angle LDA22 are too similar, the second left projection image 4121L and the second right projection image 4121R will have too much overlapping part, thereby interfering with the display of information contained in the second left projection image 4121L and the second right projection image 4121R, and further affecting the driving of the observer. Therefore, the difference between the second left downward viewing angle LDA21 and the second right downward viewing angle LDA22 should not be too large, specifically, 0°≤|LDA21-LDA22|≤1°. It should be noted that the first end refers to the end of the laminated glass 10 close to the driver seat in the vehicle.

[0112] In the embodiment, the ratio between the second left virtual image distance VID21 between the second left projection image 4121L and the eye E10 of the observer and the second right virtual image distance VID22 between the second right projection image 4121R and the eye E10 of the observer needs to maintain a certain range. If the ratio between the second left virtual image distance VID21 and the second right virtual image distance VID22 is too large, the switching between the second left projection image 4121L and the second right projection image 4121R by the eye E10 of the observer will be too abrupt and eye fatigue will be easily caused. In addition, if the ratio between the second left virtual image distance VID21 and the second right virtual image distance VID22 is too large, the wedge angle difference between the two second projection display areas 412 arranged adjacent to each other in the horizontal direction of the laminated glass 10 will be too large, and the design and production difficulty of the laminated glass 10 will be increased. Therefore, the ratio between the second left virtual image distance VID21 and the second right virtual image distance VID22 needs to maintain a certain range, specifically, the relationship between the second left virtual image distance VID21 and the second right virtual image distance VID22 is: 0.5≤VID21 / VID22≤2, preferably, 0.8≤VID21 / VID22≤1.2.

[0113] Please refer again to Figure 1 In the embodiment, the plurality of projection display areas 410 are arranged separately or partially overlapped.

[0114] In an embodiment, the plurality of projection display areas 410 can be arranged separately to ensure that the information transmission between the plurality of projection display areas 410 is more independent and clear. In another embodiment, the projection display areas 410 arranged adjacent to each other can be partially overlapped to increase the number of the projection display areas 410. In addition, the partial overlap between the projection display areas 410 arranged adjacent to each other can also increase the linkage of information transmission between the projection display areas 410 arranged adjacent to each other, thereby increasing the diversity of the head-up display system 1.

[0115] In an embodiment, the wedge angle of the first projection display area 411 ranges from 0 mrad to 0.5 mrad, and the wedge angle of the second projection display area 412 ranges from 0.1 mrad to 0.8 mrad. Specifically, the wedge angle of the first projection display area 411 can be 0.1 mrad, 0.18 mrad, 0.23 mrad, 0.47 mrad, etc.; the wedge angle of the second projection display area 412 can be 0.16 mrad, 0.25 mrad, 0.38 mrad, 0.44 mrad, 0.68 mrad, etc., which are not limited in the present application.

[0116] Please refer again to Figure 6 In the embodiment, the head-up display system 1 further comprises a virtual eyebox surface EB10 located inside the vehicle and at least one virtual virtual image surface (i.e. first virtual image surface TB20) located outside the vehicle, each of the first projection display areas 411 corresponds to a first virtual image surface TB20, and the ratio of the height to the width of the first virtual image surface TB20 is less than or equal to 0.5.

[0117] In the present embodiment, the combination of the eye box surface EB11 and the first virtual image surface TB21, the wedge angle scatter data set composed of the data points of the required theoretical wedge angle value of the sub-image in the direction from the bottom edge 10b to the top edge 10a of the laminated glass 10 is described by way of example. The points on the eye box surface EB11 are numbered, for example, the median line of the eye box surface EB11 can be represented by the line connecting the point EB_R1C2 and the point EB_R5C2, wherein EB (Eye Box) represents the eye box surface EB11, R represents row, and C represents column. Similarly, the points on the first virtual image surface TB21 are numbered, and the height of the first virtual image surface TB21 can be represented by the distance between the point TB_R1C2 and the point TB_R5C2, wherein TB (Target Image Box) represents the first virtual image surface TB21.

[0118] Referring to Figure 19 , Figure 19 The wedge angle scatter data set provided by the present embodiment is shown in the diagram. The first line connecting the vertex on the median line of the eye box surface EB11 and the point TB_R1C2 is the first line, and the first line has a first intersection point with the laminated glass. The second line connecting the vertex on the median line of the eye box surface EB11 and the point TB_R5C2 is the second line, and the second line has a second intersection point with the laminated glass. The length of the first intersection point and the second intersection point in the direction from the bottom edge 10b to the top edge 10a is Wm_C1. Figure 19 In the present embodiment, the point TB_R1C2 has R1C2 in the wedge angle scatter data set corresponding to the vertex on the median line of the eye box surface EB11, and the point TB_R5C2 has R5C2 in the wedge angle scatter data set corresponding to the vertex on the median line of the eye box surface EB11. The value of Wm_C1 is equal to the difference between the X value (i.e., the distance to the bottom edge of the laminated glass) of R1C2 and the X value of R5C2.

[0119] The length from point TB_R1C2 to point TB_R5C2 along the X-axis is Wm_C1, observed from the position of the vertex on the perpendicular bisector of the neutron eye box EB11. The length from point TB_R1C2 to point TB_R5C2 along the X-axis is Wm_C5, observed from the position of the bottom point on the perpendicular bisector of the neutron eye box EB11. Similarly, the lengths from point TB_R1C2 to point TB_R5C2 along the X-axis can be obtained by taking the positions of three other points between the vertex and the bottom point, respectively, and are Wm_C2, Wm_C3, and Wm_C4. Thus, the height of the first virtual image plane TB21 corresponds to the length of the wedge-angle scattered data block from Wm_C1 to Wm_C5, which will be simplified to Wm_C below. Similarly, the heights of the upper first virtual image plane TB21 and the lower first virtual image plane TB21 correspond to the lengths of the wedge angle scatter data block, respectively, Wt_C and Ws_C. In this application, the X-axis is defined as the direction of travel from the bottom edge 10b to the top edge 10a of the laminated glass.

[0120] In this embodiment, please refer to the following: Figure 20 , Figure 20 This is a schematic cross-sectional view of laminated glass provided in one embodiment of this application. It should be noted that... Figure 20 This is a cross-sectional schematic diagram of the laminated glass 10 viewed from the outside of the vehicle towards the inside, where i represents the row number of the corresponding point on the first virtual image plane TB21, and j represents the column number of the corresponding point on the first virtual image plane TB21. Figure 20 As shown, the width of the first virtual image plane TB21 is projected onto the laminated glass 10 with a vertical length, that is, the width of the first virtual image plane TB21 corresponds to the length of the wedge-angle scatter data block. A second line is formed by connecting the vertex on the perpendicular bisector of the neutron eye box EB11 to point TB_R5C2, which intersects the laminated glass at a second point. A third line is formed by connecting the vertex on the perpendicular bisector of the neutron eye box EB11 to point TB_R5C3 at the lower right corner of the first virtual image plane TB21 (viewed from inside the vehicle to outside), which intersects the laminated glass at a third point. The length of the second and third intersections in the direction from the bottom edge 10b to the top edge 10a is Wm_R1. Figure 19In the middle, the point TB_R5C2 has R5C2 in the wedge angle scatter point data set corresponding to the vertex on the middle perpendicular line of the eyebox surface EB11, the point TB_R5C3 has R5C3 in the wedge angle scatter point data set corresponding to the vertex on the middle perpendicular line of the eyebox surface EB11, and the value of Wm_R1 is equal to the difference between the X value of R5C2 and the X value of R5C3. The first connecting line is the line connecting the vertex on the middle perpendicular line of the eyebox surface EB11 and the point TB_R1C2, the first connecting line has a first intersection point with the laminated glass, the fourth connecting line is the line connecting the vertex on the middle perpendicular line of the eyebox surface EB11 and the point TB_R1C1 (viewed from inside to outside of the vehicle) at the upper left corner of the first sub-virtual image surface TB21, the fourth connecting line has a fourth intersection point with the laminated glass, and the length of the first intersection point and the fourth intersection point in the direction from the bottom edge 10b to the top edge 10a is Wm_L1. In the middle, Figure 19 In the middle, the point TB_R5C2 has R5C2 in the wedge angle scatter point data set corresponding to the vertex on the middle perpendicular line of the eyebox surface EB11, the point TB_R5C3 has R5C3 in the wedge angle scatter point data set corresponding to the vertex on the middle perpendicular line of the eyebox surface EB11, and the value of Wm_R1 is equal to the difference between the X value of R5C2 and the X value of R5C3. The first connecting line is the line connecting the vertex on the middle perpendicular line of the eyebox surface EB11 and the point TB_R1C2, the first connecting line has a first intersection point with the laminated glass, the fourth connecting line is the line connecting the vertex on the middle perpendicular line of the eyebox surface EB11 and the point TB_R1C1 (viewed from inside to outside of the vehicle) at the upper left corner of the first sub-virtual image surface TB21, the fourth connecting line has a fourth intersection point with the laminated glass, and the length of the first intersection point and the fourth intersection point in the direction from the bottom edge 10b to the top edge 10a is Wm_L1. In the middle,

[0121] Wt = Wt_C + Wt_R + Wt_L

[0122] Wm = Wm_C + Wm_R + Wm_L

[0123] Ws = Ws_C + Ws_R + Ws_L

[0124] As can be seen from the above, the height and width of the first sub-virtual image TB21 affect the size of the wedge angle scattered point data set block, and reducing the height and width of the first virtual image TB20 can reduce the size of the wedge angle scattered point data set block, forming a narrow wedge angle scattered point data set block, thereby improving the dispersion state of the wedge angle scattered point data set and obtaining better variable wedge angle curve fitting effect. Among Wm_C, Wm_L and Wm_R, Wm_C has the largest proportion, that is, among the two factors of the height and width of the first sub-virtual image TB21 that affect the narrow effect of the scattered point data distribution diagram, the change of the height of the first sub-virtual image TB21 can more easily achieve the effect of making the scattered point distribution diagram narrow, so the height-width ratio is set to be less than or equal to 0.5.

[0125] It should be noted that the height and width of the first sub-virtual image TB21 are usually measured by the field of view (FOV), such as 7°*5°, 9°*4°, 20°*5°. There is a certain conversion formula between the degree of FOV and the specification value of the first sub-virtual image TB21, which is not described in detail herein. According to the selection of FOV, the height and width of the first sub-virtual image TB21 can be determined to be less than the preset threshold, so that the height and width of the first sub-virtual image TB21 are less than the preset threshold, and the purpose of improving the dispersion state of the wedge angle scattered point data set is achieved.

[0126] In the embodiment, the ratio of the height to the width of the first virtual image TB20 is less than or equal to 0.5, that is, the ratio of the height to the width of the first sub-virtual image TB21 is less than or equal to 0.5. Specifically, from the proportional relationship of the height and width of the first virtual image TB20, the smaller the ratio of the height to the width of the first virtual image TB20, the better, and at the same time, considering that the application scenario of the present application is the laminated glass 10 on the vehicle and the layout of the display content in the FOV, the display screen in the form of "wide and narrow" is more suitable. Therefore, the ratio of the height to the width of the first virtual image TB20 is less than or equal to 0.5.

[0127] It can be understood that in the embodiment, the height and width of the first virtual image TB20 affect the wedge-shaped cross-sectional shape at different positions in the first projection display area 411, and the height of the first virtual image TB20 has a greater effect on the wedge-shaped cross-sectional shape at different positions in the first projection display area 411. Since the ratio of the height to the width of the first virtual image TB20 is less than or equal to 0.5, the proportion of the height of the first virtual image TB20 is greatly reduced, thereby improving the dispersion state of the wedge angle scattered point data set.

[0128] It can be understood that, for the area outside the first projection display area 411 in the laminated glass 10, in order to make the first projection display area 411 of the laminated glass 10 and other connected functional areas or boundary parts smooth, the first projection display area 411 of the laminated glass 10 can be extended to a certain length from both ends of the variable wedge angle curve as a transition section of the first variable wedge angle curve L1, wherein the extension can be divided into an in-segment extension and an out-segment extension, that is, the extension starting point is set within the wedge angle scatter point data set range, or the extension starting point is set outside the wedge angle scatter point data set range. Figure 9 As shown, the first projection display area 411 of the laminated glass 10 can be extended to a certain length from both ends of the variable wedge angle curve as a transition section of the first variable wedge angle curve L1, wherein the extension can be divided into an in-segment extension and an out-segment extension, that is, the extension starting point is set within the wedge angle scatter point data set range, or the extension starting point is set outside the wedge angle scatter point data set range.

[0129] Generally, the in-segment extension is better, as shown, which can make the maximum wedge angle value of the wedge angle scatter point data set smaller, and the wedge angle change rate from the bottom edge 10b of the laminated glass 10 to the position of the maximum wedge angle value more gentle, so that the manufacturing of the laminated glass 10 is easier, and the overall thickness of the laminated glass 10 can be reduced. Figure 9 Further, in the fitting of the entire variable wedge angle curve from the bottom edge 10b to the top edge 10a of the laminated glass 10, each segment of the variable wedge angle curve can be appropriately fine-tuned within the tolerance range, and then the complete variable wedge angle curve is fitted, that is, the final complete variable wedge angle curve can not completely coincide with the curve of the best variable wedge angle fitting of each segment. It can be understood that, in the present embodiment, the entire laminated glass 10 has a variable wedge-shaped cross-sectional shape, so as to improve the parallax of the primary image and the secondary image when the human eye or the visual system is located outside the eyebox face EB10.

[0130] It should be noted that, under the given arrangement specification of the projection assembly 20, according to the law of reflection of light, a single beam of light emitted from the first projection light source 211 enters the eyebox face EB10 after being reflected on the projector mirror surface and the inner surface of the laminated glass 10, and this light is unique; similarly, a single beam of light emitted from the first projection light source 211 enters the eyebox face EB10 after being reflected on the projector mirror surface and the inner surface of the laminated glass 10, and this light is also unique, and the two light beams form an angle, which is the parallax angle or parallax. It can be understood that the parallax can be divided into horizontal and vertical directions, and the component of the parallax along the up-down direction relative to the primary image is called the vertical parallax, and the component of the parallax along the left-right direction relative to the primary image is called the horizontal parallax.

[0131]

[0132] ​The variable wedge angle described in the present application includes a variable wedge angle in the vertical direction, a variable wedge angle in the horizontal direction, and a bidirectional composite variable wedge angle. For the convenience of understanding, the present application only illustrates the sub-image and the corresponding wedge angle in the vertical direction, and the sub-image and the corresponding wedge angle in the horizontal direction can also be designed by referring to the sub-image and the corresponding wedge angle in the vertical direction, which will not be described here.

[0133] In an embodiment, the ratio of the height to the width of the first virtual image plane TB20 is 0.05-0.4.

[0134] Specifically, the ratio of the height to the width of the first virtual image plane TB20 can be 0.1, 0.13, 0.17, 0.28, 0.37, etc., which is not limited in the present application.

[0135] In an embodiment, the angle between the first virtual image plane TB20 and the eyebox plane EB10 is ≤10°.

[0136] Specifically, the angle between the first virtual image plane TB20 and the eyebox plane EB10 refers to the angle formed by the intersection of the two planes, which represents the degree of inclination of the projection image formed by the first projection light source 211 on the laminated glass 10. Alternatively, the angle between the first virtual image plane TB20 and the eyebox plane EB10 is ≤5°; further, the angle between the first virtual image plane TB20 and the eyebox plane EB10 is 0°, so that the eyebox plane EB10 can observe the projection image on the laminated glass 10 at the best angle.

[0137] In an embodiment, please refer to Figure 8 , the eyebox plane EB10 includes a plurality of sub-eyebox planes EB11 in turn from high to low, and the first virtual image plane TB20 includes a plurality of first sub-virtual image planes TB21 in turn from low to high, each of the first sub-virtual image planes TB21 corresponds to a sub-eyebox plane EB11, and the connection line between the midpoint of the sub-eyebox plane EB11 and the midpoint of the corresponding first sub-virtual image plane TB21 is the principal axis, and the intersection point of the principal axes corresponding to any two adjacent sub-eyebox planes EB11 is located on the outside of the vehicle.

[0138] Specifically, as Figure 8 shown, the intersection of the principal axes of the upper sub-eyebox plane EB11-lower first sub-virtual image plane TB21 and the middle sub-eyebox plane EB11-middle first sub-virtual image plane TB21 forms intersection point a, and the intersection of the principal axes of the lower sub-eyebox plane EB11-upper first sub-virtual image plane TB21 and the middle sub-eyebox plane EB11-middle first sub-virtual image plane TB21 forms intersection point b, that is, any two adjacent sub-eyebox planes EB11 or any two adjacent first sub-virtual image planes TB21 at least partially overlap, combined with Figure 9The distribution of the different wedge angle scatter point data group blocks in the horizontal direction is overlapped with a larger area and the distance of the mutual stagger is not large.

[0139] It can be understood that when the intersection point a and the intersection point b are outside the vehicle and the distance from the laminated glass 10 is farther and farther, the overlapping part of the wedge angle scatter point data group corresponding to the adjacent first virtual image surface TB21 is smaller and smaller, and each wedge angle scatter point data group block presents an approximately rhombus shape with a left high and right low tilt, thereby forming a more elongated wedge angle scatter point data group block.

[0140] It can be understood that the parameters in the projection assembly 20 will directly affect the change of the light, thereby affecting the wedge angle value required for eliminating the secondary image at the corresponding position of the laminated glass 10. In order to reduce the manufacturing difficulty of the laminated glass 10 and under the premise of ensuring the imaging quality of the first projection light source 211, the maximum local range value of the wedge angle scatter point data group at the corresponding position of the laminated glass 10 is reduced by changing the parameters in the projection assembly 20.

[0141] Specifically, in the wedge angle scatter point data group, the difference between the maximum theoretical wedge angle and the minimum theoretical wedge angle at any position in the first projection display area 411 from the bottom edge 10b of the laminated glass 10 is referred to as a local range value, and the maximum local range value refers to the maximum value in the local range value. Reducing the maximum local range value of the wedge angle scatter point data group means that the range of the wedge angle scatter point data group is more "narrow" in Figure 9 , that is, the dispersion degree of the wedge angle values at different positions of the laminated glass 10 is reduced, and the manufacturing difficulty of the laminated glass 10 is also reduced to a certain extent.

[0142] It can be understood that in the embodiment, the maximum local range value of the wedge angle scatter point data group at the corresponding position of the laminated glass 10 is reduced by changing the parameters in the projection assembly 20, that is, the difference degree of the wedge angle values at different positions of the laminated glass 10 is reduced, the manufacturing difficulty of the laminated glass 10 is reduced, and the effect of eliminating the secondary image is good.

[0143] It should be noted that the above describes the variable wedge angle and other features related to the first projection display area 411. It can be understood that the variable wedge angle and other features related to the second projection display area 412 are similar to the variable wedge angle and other features related to the first projection display area 411, which will not be described herein.

[0144] In an embodiment, the distance from the intersection point of the principal axes corresponding to any two adjacent sub-eye box surfaces EB11 to the first surface 110 of the laminated glass 10 is 10 mm to 1000 mm.

[0145] Specifically, the distance from the intersection point of the principal axis corresponding to any two adjacent sub-eye box surfaces EB11 to the first surface 110 of the laminated glass 10 can also be 40 mm to 800 mm; further, the distance from the intersection point of the principal axis corresponding to any two adjacent sub-eye box surfaces EB11 to the first surface 110 of the laminated glass 10 can also be 100 mm to 600 mm, which is not limited in the present application.

[0146] In an embodiment, the distance from the intersection point of the principal axis intersecting the surface of the laminated glass 10 to the midpoint of the corresponding sub-eye box surface EB11 is 0.4 m to 1.2 m.

[0147] Specifically, the distance from the intersection point of the principal axis intersecting the surface of the laminated glass 10 to the midpoint of the corresponding sub-eye box surface EB11 affects the design of the head-up display system 1, and too large or too small distance will make the application effect of the head-up display system 1 worse. In order to more reasonably apply the head-up display system 1 on the vehicle, in the present embodiment, the distance from the intersection point of the principal axis intersecting the surface of the laminated glass 10 to the midpoint of the corresponding sub-eye box surface EB11 is 0.4 m to 1.2 m.

[0148] In an embodiment, the height of the sub-eye box surface EB11 is 40 mm to 60 mm.

[0149] Specifically, the sub-eye box surface EB11 is used to simulate the human eye or visual system, combined with standards such as SAE J941 and SAE J1757-2, considering the distribution range of the human eye of the applicable population and the manufacturing / assembly tolerance of the head-up display system, etc., in order to more reasonably apply the head-up display system on the vehicle, it can be appropriately adjusted to 40 mm to 60 mm.

[0150] In an embodiment, please refer to Figure 6 , the distance between the midpoint of the eye box surface EB10 and the midpoint of the first virtual image surface TB20 is the virtual image distance, when the virtual image distance is 2 m to 6 m, the wedge angle of the first projection display area 411 is 0.3 mrad to 0.7 mrad.

[0151] In the present embodiment, please refer to Figure 19 , it can be seen from the center point of the first sub-virtual image surface TB21, i.e. point TB_R3C2, observed from the midline of the sub-eye box surface EB11, that the height of the sub-eye box surface EB11 corresponds to the length L_mid of the wedge angle scatter point data group block, and it can be understood that the inclination degree of L_mid also reflects the inclination degree of the wedge angle scatter point data group block. According to the following calculation formula:

[0152] The length of L_mid projected on the x-axis ≈(L_VID-L_G) / (L_VID)*(H_EB) / sinα

[0153] wherein L_VID is the length of the virtual image distance, L_G is the length from the intersection of the principal axis and the laminated glass 10 to the center point of the eyebox surface EB11, H_EB is the height value of the eyebox surface EB11, and a is the angle between the principal axis of the eyebox surface EB11 and the first virtual image surface TB21 and the laminated glass 10 in the principal axis plane.

[0154] When the height of the eyebox surface EB11 is constant and fixed, i.e., H_EB and L_G are constant, a is constant, the longer the length of the virtual image distance, the longer L_mid. Specifically, for example, the value range of L_VID is 2.0m-15m, the value range of L_G is 0.4m-1.2m, and the value range of H_EB is 40mm-60mm, the length range of L_mid projected on the x-axis is generally 16 / sin a ~ 58 / sin a. When a = 30deg, the length range of L_mid projected on the x-axis is 32mm-108mm.

[0155] Similarly, please refer to Figure 21 , Figure 21 for the wedge angle scatter point data set provided by another embodiment of the present application. The lengths of L_tall and L_short corresponding to the upper eyebox surface EB11-lower first virtual image surface TB21 and the lower eyebox surface EB11-upper first virtual image surface TB21 can be calculated according to the above manner, and also satisfy that when the height of the eyebox surface EB11 is constant and fixed, i.e., H_EB and L_G are constant, a is constant, the longer the length of the virtual image distance, the longer L_tall and L_short.

[0156] It can be understood that under the condition of the same other conditions, the longer the length of L_tall / L_mid / L_short, the more narrow and less inclined the corresponding wedge angle scatter point data set block is, which is more suitable for designing a head-up display system with variable wedge angle.

[0157] In the present embodiment, the virtual image distance is 2m-6m, and optionally, the virtual image distance can also be 2m-4.5m, which is not limited in the present application.

[0158] In an embodiment, the distance between the midpoint of the eyebox surface EB10 and the midpoint of the first virtual image surface TB20 is the virtual image distance, and when the virtual image distance is 7m-100m, the value range of the wedge angle of the first projection display area 411 is 0.1mrad-0.3mrad. Specifically, the relationship between the virtual image distance and the wedge angle value of the first projection display area 411 is described in the previous embodiment, which is not repeated here.

[0159] In the embodiment, the virtual image distance is 7m-100m, and optionally, the virtual image distance can also be 7m-75m, which is not limited in the application.

[0160] In the application, the vehicle body coordinates, the XY plane, the XZ plane and the XY plane of the vehicle body coordinates are all established according to the national standard GB9656-2003.

[0161] In an embodiment, the radius of curvature R along the longitudinal direction and / or the transverse direction in the projection display area 410 monotonically changes, and the change rate of the radius of curvature R is-20% to +20%.

[0162] Specifically, the change rate of the radius of curvature R can be, but is not limited to, -20%, -18%, -16%, -14%, -12%, -10%, -8%, -6%, -4%, -2%, 0%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%; wherein when the longitudinal radius of curvature R changes to a certain degree, the wedge angle value of the projection display area 410 at different positions to avoid the secondary image will also fluctuate, which is easy to cause the wedge angle scatter data group to be dispersed in a large state, resulting in a large increase in the manufacturing difficulty and process cost of the laminated glass 10. In the effective area of the projection light emitted by the projection light source 201, the change rate of the radius of curvature R is (maximum radius-minimum radius) / minimum radius*100%. The projection display area 410 provided by the application has a pre-set wedge angle parameter and a change trend, so that the difference between the wedge angle values at different positions in the projection display area 410 is reduced, and the change rate of the wedge angle value presents a nonlinear decreasing change trend. The laminated glass 10 provided by the application has low manufacturing difficulty and good secondary image elimination effect.

[0163] Please refer to Figure 22 , Figure 22 The curve diagram provided by an embodiment of the application shows the change of the wedge angle value with the virtual image distance under different longitudinal radii of curvature. Specifically, Figure 22 The schematic diagram shows the projection light path and the influence of the glass surface curvature and other parameters on the secondary image by using a point of the eyebox surface EB10 and the first virtual image surface TB20. The eyebox surface EB10 in the projection light path corresponds to the first virtual image surface TB20. Under the condition that the nominal thickness of the glass, the glass installation angle, the transverse radius of curvature, the downward viewing angle, the horizontal viewing angle and the field of view range are all the same, the wedge angle value that can avoid the secondary image is simulated according to different longitudinal radii of curvature R and different virtual image distances VID; for example, Figure 22As shown, the wedge angle value of the image without parallax viewed by the eyebox surface EB10 of the laminated glass 10 decreases with the increase of the longitudinal radius of curvature R when the virtual image distance VID of the laminated glass 10 is the same. By increasing the longitudinal radius of curvature R, the wedge angle value of the image without parallax can be reduced, and the dispersion state of the wedge angle data set can be improved.

[0164] The glass installation angle is a parameter of the inclination of the glass, and the glass is often curved when applied to a vehicle. The chord line of the intersection line between the XZ plane in the vehicle body coordinate and the glass surface and the horizontal plane forms the glass installation angle.

[0165] It can be understood that the relationship between the transverse radius of curvature R and the wedge angle value of the image without parallax can be referred to the relationship between the longitudinal radius of curvature R and the wedge angle value of the image without parallax, which will not be described herein.

[0166] Please refer to Figure 22 In an embodiment, the radius of curvature R along the longitudinal direction is greater than or equal to 5000 mm. Alternatively, the radius of curvature R along the longitudinal direction according to the present application can be, but is not limited to, 5000 mm, 5100 mm, 5200 mm, 5300 mm, 5400 mm, 5500 mm, 5600 mm, 5700 mm, 5800 mm, 5900 mm, or 6000 mm. In an embodiment, the radius of curvature R along the transverse direction is 1500 mm to 4000 mm. Alternatively, the radius of curvature R along the transverse direction according to the present application can be, but is not limited to, 1500 mm, 1800 mm, 2100 mm, 2400 mm, 2700 mm, 3000 mm, 3300 mm, 3600 mm, 3900 mm, or 4000 mm. When the laminated glass 10 is used as a vehicle windshield, the laminated glass 10 has a radius of curvature R along the longitudinal direction from the bottom edge 10b to the top edge 10a and a radius of curvature R along the transverse direction from the glass side edge to the other side edge. The value of the radius of curvature at a certain position on the laminated glass 10 has an effect on the imaging of the projection display area 410 at the position, and thus has an effect on the wedge angle value set for the projection display area 410 at the position to eliminate parallax. In some embodiments, on the first change curve L1 of the laminated glass 10, when the longitudinal radius of curvature R is the same and the longitudinal radius of curvature R is greater than or equal to 5000 mm, and / or when the transverse radius of curvature R is the same and the transverse radius of curvature R is 1500 mm to 4000 mm, the effect of the wedge angle value of the image without parallax in the projection display area 410 gradually decreases.

[0167] In an embodiment, when the virtual image distance VID is the same, the corresponding wedge angle change rate is not obvious as the longitudinal curvature radius R of the glass face increases, and the change rate is approximately constant when R≥5000 mm; when the longitudinal curvature radius R is the same, the corresponding wedge angle growth rate gradually decreases as the virtual image distance VID increases, and the wedge angle change rate is greater than -0.2 mrad / 1000 mm when the virtual image distance VID≥5000 mm; increasing the virtual image distance VID, the wedge angle growth rate is more gentle, thereby improving the discrete state of the wedge angle scatter point data set. The first change curve L1 has a too large slope, which leads to high production process difficulty. Therefore, the wedge angle growth rate is preferably greater than or equal to -0.5 mrad / 1000 mm, and more preferably greater than or equal to -0.2 mrad / 1000 mm.

[0168] In an embodiment, please refer to Figure 23 , Figure 23 The schematic diagram provided by the present application shows the wedge angle value under different longitudinal curvature radii and different virtual image distances as the first downward viewing angle changes. The glass loading angle is 26.1 deg; as shown in Figure 23 the wedge angle changes as the first downward viewing angle LDA1 changes, wherein the first downward viewing angle LDA1 is the angle between the line connecting the center point of each of the sub-eye box faces EB11 and the center point of each of the corresponding first sub-virtual image faces TB21 and the vehicle body coordinate XY plane, wherein the downward (-Z axis) is negative, and vice versa.

[0169] In an embodiment, when the longitudinal curvature radius R and the virtual image distance VID of the laminated glass 10 are constant, the wedge angle value of the image without secondary image viewed by the plurality of sub-eye box faces EB10 increases as the first downward viewing angle LDA1 increases. Similarly, the first downward viewing angles LDA1 of the first sub-eye box face EB12, the second sub-eye box face EB13, and the third sub-eye box face EB14 in the same group show an increasing trend, and the wedge angle value eliminating the secondary image also shows an increasing trend, i.e., the wedge angle of the first sub-eye box face EB12 light path < the wedge angle of the second sub-eye box face EB13 light path < the wedge angle of the third sub-eye box face EB14 light path; when the difference ΔLDA1 between the first downward viewing angles of the third sub-eye box face EB14 and the first sub-eye box face EB12 is 6 deg (R=10000 mm, VID=2000 mm), the difference of the wedge angle is about 0.1 mrad; therefore, by limiting the value range of the first downward viewing angle LDA1 to -8°≤LDA≤0°, the present application ensures that the wedge angle value shows a slow increasing trend, thereby improving the discrete state of the wedge angle scatter point data set.

[0170] Similarly, the value range of the second downward viewing angle LDA2 can also refer to the value range of the first downward viewing angle LDA1, which will not be described herein.

[0171] In an embodiment, the laminated glass 10 has a functional area for signal transmission of a sensor, the functional area having a wedge-shaped cross-sectional shape with a fixed wedge angle or a linearly changing wedge angle.

[0172] The sensor can be a camera, a laser radar, etc. In the functional area for signal transmission of the camera, the laser radar, etc. sensor, a wedge-shaped interlayer adhesive layer can be used to optimize the transmission ghost problem of the corresponding sensor. The wedge-shaped interlayer adhesive layer in the functional area has a fixed wedge angle or a wedge angle with a fixed slope. The wedge angle is a fixed value or a variation curve using a first-order simple function, so that the production and control of the wedge angle can be easily controlled.

[0173] In an embodiment, a thermal insulation coating is provided on the second surface 120 and / or the third surface 210, the thermal insulation coating comprising at least one metal layer and at least two dielectric layers, each metal layer being located between two adjacent dielectric layers.

[0174] Specifically, the thermal insulation coating can be used to insulate external heat from entering the vehicle by reflecting infrared rays from the outside of the vehicle, so as to better control the temperature in the vehicle. It can be understood that in other possible embodiments, the thermal insulation coating can also be provided at other positions of the laminated glass 10, which is not limited in the present application.

[0175] In an embodiment, a first bus bar and a second bus bar electrically connected to the thermal insulation coating are further provided between the second surface 120 and the third surface 210, the thermal insulation coating having a heating power density of at least 600 W / m2 between the first bus bar and the second bus bar.

[0176] The first bus bar and the second bus bar are respectively electrically connected to the thermal insulation coating. When the first bus bar and the second bus bar are powered on, the thermal insulation coating generates heat and can achieve a heating power density of at least 600 W / m2, so as to heat the laminated glass 10 to remove frost, fog, snow, etc. and ensure the clear vision of the driver in bad weather.

[0177] In an embodiment, an anti-reflection coating or an anti-fingerprint coating is provided on the fourth surface 220. It can be understood that since the fourth surface 220 is close to the inside of the vehicle, the anti-reflection coating can prevent the laminated glass 10 from producing obvious dashboard reflections, so that the person inside the vehicle can observe more clearly when looking out of the vehicle. The anti-fingerprint coating can ensure the cleanliness of the laminated glass 10 and prevent fingerprints and other stains from being left, so as to ensure the clear vision of the driver.

[0178] Please refer to Figure 24 ,Figure 25 and Figure 26 , Figure 24 A flowchart illustrating a design method for a head-up display system provided in one embodiment of this application; Figure 25 for Figure 24 A schematic diagram of the design method for the head-up display system provided in the implementation method; Figure 26 for Figure 24 A schematic diagram of the first variation curve in the design method of the head-up display system provided in this embodiment. In this embodiment, the design method of the head-up display system 1 includes designing the eye box surface EB10 located inside the vehicle according to the observer inside the vehicle. The first projection display area 411 will be described as an example below, and a virtual image surface (first virtual image surface TB20) is designed according to the projected image (first projected image 4111) observed by the observer inside the vehicle through each projection display area 410 (first projection display area 411).

[0179] The eye-box surface EB10 includes multiple sub-eye-box surfaces EB11 arranged sequentially from high to low, and the first virtual image surface TB20 includes multiple sub-virtual image surfaces (first sub-virtual image surfaces TB21) arranged sequentially from low to high. Each first sub-virtual image surface TB21 corresponds to one sub-eye-box surface EB11. An observation point array EB111 is selected on each sub-eye-box surface EB11, and a virtual image point array (first virtual image point array TB211) is selected on each first sub-virtual image surface TB21. The line connecting the points in the observation point array EB111 and the points in the first virtual image point array TB211 passes through the corresponding first projection display area 411, and the intersection of the connecting line and the first projection display area 411 is the incident point. Based on the projection component 20, the laminated glass 10, and the multiple connecting lines, multiple first theoretical wedge angle values ​​of the laminated glass 10 are calculated when the first projected image 4111 at the corresponding incident point position has no secondary image. Based on the plurality of first theoretical wedge angle values ​​and the distance from the incident point to the bottom edge 10b of the laminated glass corresponding to each first theoretical wedge angle value, a first variation curve L1 of the wedge angle as a function of the distance from the incident point to the bottom edge 10b of the laminated glass is obtained. The wedge angle value of the laminated glass 10 in the corresponding first projection display area 411 is then determined based on the first variation curve L1.

[0180] In this embodiment, the laminated glass 10 is used for the windshield of a vehicle and is applied to the vehicle's head-up display system 1. The design method of the laminated glass 10 includes steps S11, S12, S13, S14, S15, S16, and S17. Steps S11, S12, S13, S14, S15, S16, and S17 will be described in detail below.

[0181] S11, a projection assembly 20 and a laminated glass 10 are provided, wherein the projection light emitted by the projection assembly 20 is incident on at least one projection display area 410 on the laminated glass 10.

[0182] S12, determine the eyebox surface EB10 located in the vehicle.

[0183] S13, design the virtual image surface.

[0184] In the embodiment, the eyebox surface EB10 comprises a plurality of sub-eyebox surfaces EB11 in order from high to low, and the first virtual image surface TB20 comprises a plurality of first sub-virtual image surfaces TB21 in order from low to high. Each first sub-virtual image surface TB21 corresponds to a sub-eyebox surface EB11. Specifically, the eyebox surface EB10 is used to simulate the plane in which the observer's eyes are located when the observer is sitting in the driver's cabin of the vehicle. The plurality of sub-eyebox surfaces EB11 are used to simulate the different heights of the observer's eyes, i.e., the plurality of sub-eyebox surfaces EB11 are used to simulate the different viewing angles of the observer. The first virtual image surface TB20 is used to simulate the virtual image formed on the other side of the laminated glass 10 by the reflection of the projection light on the eyebox surface EB10. The plurality of first sub-virtual image surfaces TB21 are used to simulate the virtual images formed on the other side of the laminated glass 10 by the reflection of the projection light on the plurality of sub-eyebox surfaces EB11 at different positions. Specifically, the plurality of sub-eyebox surfaces EB11 and the plurality of first sub-virtual image surfaces TB21 are in a central symmetric relationship in terms of height, i.e., the highest sub-eyebox surface EB11 corresponds to the lowest first sub-virtual image surface TB21, and the lowest sub-eyebox surface EB11 corresponds to the highest first sub-virtual image surface TB21.

[0185] S14, select an observation point array EB111 on each sub-eyebox surface EB11, and select a virtual image point array on each sub-virtual image surface. The line connecting a point in the observation point array EB111 and a point in the virtual image point array passes through the corresponding projection display area 410, and the intersection of the line and the projection display area 410 is the incident point.

[0186] In the embodiment, each point in the observation point array EB111 corresponds to the position of the observer's eyes. Each point in the first virtual image point array TB211 corresponds to the virtual image formed on the first virtual image surface TB20 by the reflection of the projection light on the eyebox surface EB10 at a certain point. Specifically, each point in the first virtual image point array TB211 corresponds to one or more points in the observation point array EB111, i.e., the observer can see the virtual image at the same position on the first virtual image surface TB20 from different positions on the eyebox surface EB10. In addition, the observer can see the virtual images at different positions on the first virtual image surface TB20 from the same position on the eyebox surface EB10.

[0187] S15, calculating a plurality of first theoretical wedge angle values of the laminated glass at the corresponding incident point positions according to the projection assembly 20, the laminated glass 10 and the plurality of connecting lines.

[0188] In the present embodiment, in each of the corresponding arranged sub-eye box face EB11 and the first sub-virtual image face TB21, the connecting line between each point in the observation point array EB111 and each point in the first virtual image point array TB211 intersects with the laminated glass 10, i.e. an incident point. The first theoretical wedge angle value at the incident point is calculated when the observer sees no ghost image of the virtual image on the first sub-virtual image face TB21 at each point in the observation point array EB111. The number of the incident points used for simulation calculation is the number of the first theoretical wedge angle values.

[0189] S16, fitting to obtain a first change curve L1 of the wedge angle with the distance to the bottom edge 10b of the laminated glass according to the plurality of first theoretical wedge angle values and the distance from the incident point corresponding to each first theoretical wedge angle value to the bottom edge 10b of the laminated glass.

[0190] In the embodiment, the plurality of first theoretical wedge angle values present a discrete distribution with the distance from the incident point to the bottom edge 10b of the laminated glass. Specifically, in an embodiment, a sub-discrete graph T11 of the plurality of first theoretical wedge angle values can be calculated for each corresponding sub-eye box face EB11 and the first sub-virtual image face TB21, and a plurality of sub-discrete graphs T11 are collected in the same coordinate system to form a first discrete graph T10. The first variation curve L1 is fitted by function fitting the first discrete graph T10 of the plurality of first theoretical wedge angle values. For example, the function can be, but is not limited to, a cubic, quartic, quintic polynomial function or an exponential function, a power function, a logarithmic function, and the like basic functions and composite functions composed of them. The data curve fitting process can be completed in Microsoft Excel, or WPS or MATLAB or OriginPro software, etc. Since the observer can see multiple images of different distances or angles at a certain point on the laminated glass 10, the first theoretical wedge angle value at this point has multiple values. However, the wedge angle value at a certain point on the laminated glass 10 can only have one value. In addition, the first theoretical wedge angle value also has multiple values at other points of the same distance along the direction from the bottom edge to the top edge of the glass of the point, and the wedge angle value at a certain distance from the bottom edge of the laminated glass 10 is suitable to have one value. Therefore, it is necessary to appropriately select the wedge angle value at each incident point on the laminated glass 10 to weaken the secondary image phenomenon. By function fitting the plurality of first theoretical wedge angle values, the deviation of the wedge angle value of the laminated glass 10 on the first projection display area 411 from the plurality of first theoretical wedge angle values can be smaller, thereby reducing the secondary image phenomenon of the first projection display area 411 projected onto the laminated glass 10, and improving the imaging quality of the laminated glass 10. In another embodiment, for the plurality of first theoretical wedge angle values corresponding to each incident point, the average of the maximum and minimum values of the plurality of first theoretical wedge angle values corresponding to the point is selected, and then the average of the maximum and minimum values of the plurality of first theoretical wedge angle values at each incident point is connected to form the first variation curve L1.

[0191] S17, determining the wedge angle value of the laminated glass 10 in the corresponding projection display area 410 according to the first variation curve L1.

[0192] In the embodiment, the wedge angle value of the laminated glass 10 corresponding to the first projected display area 411 is determined by the first change curve L1 to weaken the secondary image phenomenon of the laminated glass 10 in the first projected display area 411. Specifically, by the selection design of the first virtual image face TB20, the distribution of the plurality of first theoretical wedge angle values of the first projected display area 411 in the laminated glass 10 can be calculated, and the first change curve L1 corresponding to the first projected display area 411 is fitted to determine the wedge angle value of the laminated glass 10 corresponding to the first projected display area 411.

[0193] Please refer to Figure 27 , Figure 27 for Figure 24 the design method of the head-up display system provided in the embodiment. In the embodiment, the eyebox face EB10 includes a first sub-eyebox face EB12, a second sub-eyebox face EB13 and a third sub-eyebox face EB14 in turn from high to low. The plurality of first sub-virtual image faces TB21 includes a first low virtual image face TB22, a first middle virtual image face TB23 and a first high virtual image face TB24 in turn from low to high. The "selecting observation point arrays EB111 on each sub-eyebox face EB11, and selecting virtual image point arrays on each sub-virtual image face" includes selecting a first sub-observation point array EB121: m1*n1 on the first sub-eyebox face EB12, selecting a second sub-observation point array EB131: m2*n2 on the second sub-eyebox face EB13, and selecting a third sub-observation point array EB141: m3*n3 on the third sub-eyebox face EB14, wherein m1, m2, m3≥1 and are natural numbers, n1, n2, n3≥1 and are natural numbers. And selecting a first low virtual image point array TB221: i1*j1 on the first low virtual image face TB22, selecting a first middle virtual image point array TB231: i2*j2 on the first middle virtual image face TB23, and selecting a first high virtual image point array TB241: i3*j3 on the first high virtual image face TB24, wherein i1, i2, i3≥1 and are natural numbers, j1, j2, j3≥1 and are natural numbers.

[0194] In the embodiment, the eyebox face EB10 includes a first sub-eyebox face EB12, a second sub-eyebox face EB13 and a third sub-eyebox face EB14 in turn from high to low, that is, the position of the eye of the observer in the driver's cabin is simplified to three height positions of high, middle and low, thereby simplifying the design method of the head-up display system 1. Although selecting more positions of the eyebox face EB10 can increase the accuracy of calculation, more eyebox faces EB10 will increase the number of sub-dispersion graphs T11 of the plurality of first theoretical wedge angle values, thereby increasing the calculation amount and difficulty of fitting the first change curve L1.

[0195] In the embodiment, step S14 in the above embodiment specifically comprises S141 and S142. Next, steps S141 and S142 are described in detail.

[0196] S141, selecting a first sub-observation point array EB121:m1*n1 on the first sub-eye box surface EB12, selecting a second sub-observation point array EB131:m2*n2 on the second sub-eye box surface EB13, and selecting a third sub-observation point array EB141:m3*n3 on the third sub-eye box surface EB14, wherein m1, m2, and m3 are greater than or equal to 1 and are natural numbers, and n1, n2, and n3 are greater than or equal to 1 and are natural numbers.

[0197] In the embodiment, the first sub-observation point array EB121:m1*n1 is selected on the first sub-eye box surface EB12. m1 is greater than or equal to 1 and is a natural number, and n1 is greater than or equal to 1 and is a natural number. For example, m1 can be, but is not limited to, 3, 5, or 8, and n1 can be, but is not limited to, 3, 5, or 8. The second sub-observation point array EB131:m2*n2 is selected on the second sub-eye box surface EB13. m2 is greater than or equal to 1 and is a natural number, and n2 is greater than or equal to 1 and is a natural number. For example, m2 can be, but is not limited to, 3, 5, or 8, and n2 can be, but is not limited to, 3, 5, or 8. m2 is the same as or different from m1, and n2 is the same as or different from n1. The third sub-observation point array EB141:m3*n3 is selected on the third sub-eye box surface EB14. m3 is greater than or equal to 1 and is a natural number, and n3 is greater than or equal to 1 and is a natural number. For example, m3 can be, but is not limited to, 3, 5, or 8, and n3 can be, but is not limited to, 3, 5, or 8. m3 is the same as or different from m1 and m2, and n3 is the same as or different from n1 and n2.

[0198] S142, selecting a first low-virtual-image point array TB221:i1*j1 on the first low-virtual-image surface TB22, selecting a first middle-virtual-image point array TB231:i2*j2 on the first middle-virtual-image surface TB23, and selecting a first high-virtual-image point array TB241:i3*j3 on the first high-virtual-image surface TB24, wherein i1, i2, and i3 are greater than or equal to 1 and are natural numbers, and j1, j2, and j3 are greater than or equal to 1 and are natural numbers.

[0199] In the embodiment, a first low virtual image point array TB221 is selected on the first low virtual image surface TB22. i1*j1, where i1≥1 and is a natural number, and j1≥1 and is a natural number. For example, i1may be, but is not limited to, 3, 5, or 8, and j1may be, but is not limited to, 3, 5, or 8. A first middle virtual image point array TB231 is selected on the first middle virtual image surface TB23. i2*j2, where i2≥1 and is a natural number, and j2≥1 and is a natural number. For example, i2may be, but is not limited to, 3, 5, or 8, and j2may be, but is not limited to, 3, 5, or 8. i2is the same as or different from i1, and j2is the same as or different from j1. A first high virtual image point array TB241 is selected on the first high virtual image surface TB24. i3*j3, where i3≥1 and is a natural number, and j3≥1 and is a natural number. For example, i3may be, but is not limited to, 3, 5, or 8, and j3may be, but is not limited to, 3, 5, or 8. i3is the same as or different from i1and i2, and j3is the same as or different from j1and j2. It should be noted that i1*j1is the same as or different from m1*n1, i2*j2is the same as or different from m2*n2, and i3*j3is the same as or different from m3*n3.

[0200] Reference is made to Figure 28 , Figure 28 A schematic diagram of the first change curve calculated by the design method of the head-up display system provided in the embodiment is shown in the figure. In the embodiment, the “calculating a plurality of first theoretical wedge angle values of the laminated glass when the projection image has no secondary image at the corresponding incident point position” includes calculating a plurality of first sub-theoretical wedge angle values of the laminated glass 10 when the first projection image 4111 has no secondary image at the incident point position corresponding to the connection line according to the projection assembly 20, the laminated glass 10, and the connection line between each point in the first sub-observation point array EB121 and each point in the first low virtual image point array TB221. Calculating a plurality of second sub-theoretical wedge angle values of the laminated glass 10 when the first projection image 4111 has no secondary image at the incident point position corresponding to the connection line according to the projection assembly 20, the laminated glass 10, and the connection line between each point in the second sub-observation point array EB131 and each point in the first middle virtual image point array TB231. And calculating a plurality of third sub-theoretical wedge angle values of the laminated glass 10 when the first projection image 4111 has no secondary image at the incident point position corresponding to the connection line according to the projection assembly 20, the laminated glass 10, and the connection line between each point in the third sub-observation point array EB141 and each point in the first high virtual image point array TB241.

[0201] In the embodiment, the step S15 in the foregoing embodiment specifically includes S151, S152, and S153. Next, the steps S151, S152, and S153 are described in detail.

[0202] S151, according to the projection component 20, the laminated glass 10 and the line connecting each point in the first sub observation point array EB121 and each point in the first low virtual image point array TB221, a plurality of first sub theoretical wedge angle values of the laminated glass 10 when the projection image has no secondary image at the position of the incident point corresponding to the line are calculated.

[0203] In the embodiment, according to the plurality of first sub theoretical wedge angle values, a first sub discrete graph T12 of the plurality of first sub theoretical wedge angle values and the distance from the bottom edge 10b of the laminated glass can be obtained.

[0204] S152, according to the projection component 20, the laminated glass 10 and the line connecting each point in the second sub observation point array EB131 and each point in the first middle virtual image point array TB231, a plurality of second sub theoretical wedge angle values of the laminated glass 10 when the projection image has no secondary image at the position of the incident point corresponding to the line are calculated.

[0205] In the embodiment, according to the plurality of second sub theoretical wedge angle values, a second sub discrete graph T13 of the plurality of second sub theoretical wedge angle values and the distance from the bottom edge 10b of the laminated glass can be obtained.

[0206] S153, according to the projection component 20, the laminated glass 10 and the line connecting each point in the third sub observation point array EB141 and each point in the first high virtual image point array TB241, a plurality of third sub theoretical wedge angle values of the laminated glass 10 when the projection image has no secondary image at the position of the incident point corresponding to the line are calculated.

[0207] In the embodiment, according to the plurality of third sub theoretical wedge angle values, a third sub discrete graph T14 of the plurality of third sub theoretical wedge angle values and the distance from the bottom edge 10b of the laminated glass can be obtained.

[0208] In the embodiment, the first sub-discrete graph T12, the second sub-discrete graph T13 and the third sub-discrete graph T14 are calculated first, and then the first sub-discrete graph T12, the second sub-discrete graph T13 and the third sub-discrete graph T14 are combined to form the first discrete graph T10. The first sub-discrete graph T12, the second sub-discrete graph T13 and the third sub-discrete graph T14 can be optimized respectively, so as to optimize the first discrete graph T10. For example, the second sub-eyebox surface EB13 corresponding to the second sub-discrete graph T13 is used to simulate the viewing angle surface of the eye of the observer at the height in the driver's cabin. The second sub-eyebox surface EB13 is the most common height for the observer sitting in the driver's cabin, and thus the second sub-eyebox surface EB13 is the eyebox surface EB10 most needing to eliminate the projection sub-image. Therefore, the second sub-discrete graph T13 can be optimized to make the selection of the wedge angle value corresponding to the second sub-eyebox surface EB13 at the laminated glass 10 more accurate. For example, the number of selected points in the second sub-observation point array EB131 and / or the first virtual image point array TB231 is increased to increase the number of third sub-theoretical wedge angle values in the second sub-discrete graph T13, thereby improving the fitting accuracy of the first change curve L1.

[0209] Please refer again to Figure 28 In the embodiment, the ratio of the maximum local range value AW of the plurality of first theoretical wedge angle values to the overall range value AC of the plurality of first theoretical wedge angle values is AW / AC≤0.9.

[0210] In the embodiment, the ratio of the maximum local range value AW of the plurality of first theoretical wedge angle values to the overall range value AC of the plurality of first theoretical wedge angle values is AW / AC≤0.9, which can make the dispersion degree of the plurality of first theoretical wedge angle values smaller, thereby making the dispersion degree of the first discrete graph T10 smaller, increasing the smoothness of the first change curve L1, i.e., reducing the slope of the first change curve L1, thereby reducing the wedge angle change rate of the laminated glass 10 and reducing the production difficulty of the laminated glass 10. It should be noted that the maximum local range value AW of the plurality of first theoretical wedge angle values refers to the maximum value in the local range value, wherein the local range value is the difference between the maximum value and the minimum value of the plurality of first theoretical wedge angle values at a position with a distance X from the bottom edge 10b of the laminated glass. The overall range value AC of the plurality of first theoretical wedge angle values refers to the difference between the maximum value and the minimum value of all the first theoretical wedge angle values.

[0211] The ratio of the maximum local range value AW1 of the plurality of first sub theoretical wedge angle values to the overall range value AC of the plurality of first theoretical wedge angle values is AW1 / AC≤0.9. The ratio of the maximum local range value AW2 of the plurality of second sub theoretical wedge angle values to the overall range value AC of the plurality of first theoretical wedge angle values is AW2 / AC≤0.9. The ratio of the maximum local range value AW3 of the plurality of third sub theoretical wedge angle values to the overall range value AC of the plurality of first theoretical wedge angle values is AW3 / AC≤0.9. Thus, the dispersion degree of the first discrete graph T10 is smaller, and the smoothness of the first change curve L1 is increased, that is, the slope of the first change curve L1 is reduced, thereby reducing the wedge angle change rate of the laminated glass 10 and reducing the production difficulty of the laminated glass 10.

[0212] In the embodiment, the ratio of the maximum local range value AW1 of the plurality of first sub theoretical wedge angle values to the overall range value AC of the plurality of first theoretical wedge angle values is AW1 / AC≤0.9, which can make the dispersion degree of the plurality of first sub theoretical wedge angle values smaller. The maximum local range value AW1 of the plurality of first sub theoretical wedge angle values refers to the maximum value in the first sub local range value, and the first sub local range value is the difference between the maximum value and the minimum value of the plurality of first sub theoretical wedge angle values at a position with a distance X1 from the bottom edge 10b of the laminated glass.

[0213] In the embodiment, the ratio of the maximum local range value AW2 of the plurality of second sub theoretical wedge angle values to the overall range value AC of the plurality of first theoretical wedge angle values is AW2 / AC≤0.9, which can make the dispersion degree of the plurality of second sub theoretical wedge angle values smaller. The maximum local range value AW2 of the plurality of second sub theoretical wedge angle values refers to the maximum value in the second sub local range value, and the second sub local range value is the difference between the maximum value and the minimum value of the plurality of second sub theoretical wedge angle values at a position with a distance X2 from the bottom edge 10b of the laminated glass.

[0214] In the embodiment, the ratio of the maximum local range value AW3 of the plurality of third sub theoretical wedge angle values to the overall range value AC of the plurality of first theoretical wedge angle values is AW3 / AC≤0.9, which can make the dispersion degree of the plurality of third sub theoretical wedge angle values smaller. The maximum local range value AW3 of the plurality of third sub theoretical wedge angle values refers to the maximum value in the third sub local range value, and the third sub local range value is the difference between the maximum value and the minimum value of the plurality of third sub theoretical wedge angle values at a position with a distance X3 from the bottom edge 10b of the laminated glass.

[0215] In an embodiment, the distance between the plurality of virtual image surfaces (the first virtual image surfaces TB20) and the eyebox surface EB10 increases in a direction from the bottom edge 10b to the top edge 10a of the laminated glass 10.

[0216] In the present embodiment, the distance between the plurality of first virtual image surfaces TB20 and the eyebox surface EB10 increases in a direction from the bottom edge 10b to the top edge 10a of the laminated glass 10, and the plurality of first projection display regions 411 are designed on the laminated glass 10, so that the observer sitting in the driver's cabin can switch between the plurality of first projection display regions 411 more smoothly.

[0217] Please refer to Figure 29 , Figure 29 The schematic diagram of the design method of the head-up display system provided in the present embodiment is provided. In the present embodiment, the projection display region 410 includes at least two first projection display regions 411, and at least two first variation curves L1 of the wedge angle with the distance of the incident point to the bottom edge 10b of the laminated glass are fitted. When the maximum deviation value AXmax of the adjacent two first variation curves L1 is greater than 0.15 mrad, after the wedge angle value of the laminated glass 10 in the corresponding first projection display region 411 is determined according to the first variation curve L1, the design method of the head-up display system 1 further includes adjusting the distance between the eyebox surface EB10 and the corresponding virtual image surface (the first virtual image surface TB20) of one of the adjacent two first variation curves L1. The new plurality of first theoretical wedge angle values are recalculated. According to the new plurality of first theoretical wedge angle values and the distance of the incident point to the bottom edge 10b of the laminated glass corresponding to each first theoretical wedge angle value, the new first variation curve L1 of the wedge angle with the distance of the incident point to the bottom edge 10b of the laminated glass is obtained. And judge whether the maximum deviation value AXmax of the new first variation curve L1 and the other of the adjacent two first variation curves L1 is greater than 0.15 mrad. If yes, repeat the above steps. If not, the wedge angle value of the laminated glass 10 in the corresponding first projection display region 411 is determined according to the new first variation curve L1.

[0218] In the present embodiment, when the adjacent two first variation curves L1 have an overlapping portion on the X-axis, the maximum deviation value AXmax is equal to the maximum value of the wedge angle difference between the two first variation curves L1 in the overlapping portion; when the adjacent two first variation curves L1 have no overlapping portion on the X-axis, the maximum deviation value AXmax is equal to the difference between the wedge angle values of the most adjacent two ends of the two first variation curves L1.

[0219] When the maximum deviation value AXmax is greater than 0.15 mrad, the distance between the eyebox surface EB10 and the first virtual image surface TB20 corresponding to any one of the two adjacent first change curves L1 needs to be adjusted to adjust the maximum deviation value AXmax of the two designed first change curves L1 to be less than or equal to 0.15 mrad, or less than or equal to 0.10 mrad, or less than or equal to 0.08 mrad, or less than or equal to 0.05 mrad.

[0220] Specifically, after the step of "determining the wedge angle value of the laminated glass 10 in the corresponding first projection display area 411 according to the first change curve L1", the design method of the laminated glass 10 further includes steps S18, S19, S20, S21 and S22. Next, the steps S18, S19, S20, S21 and S22 will be described in detail.

[0221] S18, adjusting the distance between the eyebox surface EB10 and the virtual image surface corresponding to one of the two adjacent first change curves L1.

[0222] Wherein, adjusting the distance between the eyebox surface EB10 and the first virtual image surface TB20 corresponding to one of the two adjacent first change curves L1 can adjust the wedge angle value required to eliminate the secondary image. Under the same conditions, the greater the distance between the eyebox surface EB10 and the first virtual image surface TB20 corresponding to one of the two adjacent first change curves L1, the smaller the wedge angle value required to eliminate the secondary image. In this embodiment, the distance between the first virtual image surface TB20 corresponding to one of the two adjacent first change curves L1 (see L11 in Figure 29 ) and the eyebox surface EB10 can be increased, and / or the distance between the first virtual image surface TB20 corresponding to the other first change curve L1 (see L12 in Figure 29 ) and the eyebox surface EB10 can be reduced, so that the two adjacent first change curves L1 are closer to the design target.

[0223] S19, recalculating to obtain a new plurality of first theoretical wedge angle values.

[0224] In this embodiment, after adjusting the distance between the first virtual image surface TB20 and the eyebox surface EB10, the plurality of first theoretical wedge angle values calculated by the calculation method of the foregoing embodiments can fit the first change curve L1 that is closer to the design target.

[0225] S20, fitting to obtain a new first change curve L1 of the wedge angle with the distance of the incident point to the bottom edge of the laminated glass 10 according to the new plurality of first theoretical wedge angle values and the distance of the incident point to the bottom edge of the laminated glass 10 corresponding to each first theoretical wedge angle value.

[0226] S21, determining whether the maximum deviation value AXmax of the new first variation curve L1 from another one of the two adjacent first variation curves L1 is greater than 0.15 mrad.

[0227] In the embodiment, it is determined whether the maximum deviation value AXmax of the new first variation curve L1 from another one of the two adjacent first variation curves L1 is greater than 0.15 mrad. If yes, steps S18 to S21 are repeated. If no, step S22 is performed.

[0228] S22, determining the wedge angle value of the laminated glass 10 in the corresponding first projection display area 411 according to the new first variation curve L1.

[0229] Please refer to Figure 30 , Figure 30 A schematic diagram of the second variation curve calculated by the design method of the head-up display system provided in the embodiment. In the embodiment, the plurality of projection display areas 410 include at least one second projection display area 412, and a second virtual image plane TB30 is designed according to the second projection image 4121 observed by an observer in the vehicle through each second projection display area 412. The second virtual image plane M30 includes a plurality of second sub-virtual image planes TB31 in order from low to high. Each second sub-virtual image plane TB31 corresponds to a sub-eye box plane EB11. An observation point array EB111 is selected on each sub-eye box plane EB11, and a second virtual image point array TB311 is selected on each second sub-virtual image plane TB31. The line connecting a point in the observation point array EB111 and a point in the second virtual image point array TB311 passes through the corresponding second projection display area 412, and the intersection of the line and the second projection display area 412 is an incident point. A plurality of second theoretical wedge angle values of the laminated glass 10 when the second projection display area 412 has no secondary images at the position of the incident point are calculated according to the projection assembly 20, the laminated glass 10, and the plurality of lines. According to the plurality of second theoretical wedge angle values and the distance from the incident point corresponding to each second theoretical wedge angle value to the bottom edge 10b of the laminated glass, a second variation curve L2 of the wedge angle with respect to the distance from the incident point to the bottom edge 10b of the laminated glass is fitted. And the wedge angle value of the laminated glass 10 in the corresponding second projection display area 412 is determined according to the second variation curve L2.

[0230] The maximum local range value AWU of the set of the plurality of first theoretical wedge angle values and the plurality of second theoretical wedge angle values, and the overall range value ACU of the set of the plurality of first theoretical wedge angle values and the plurality of second theoretical wedge angle values, and the ratio of AWU and ACU is AWU / ACU≤0.9. The overall dispersion of the set of the plurality of first theoretical wedge angle values and the plurality of second theoretical wedge angle values is smaller, thereby increasing the smoothness of the first change curve L1 and the second change curve L2, i.e. reducing the overall slope of the first change curve L1 and the second change curve L2, thereby reducing the overall wedge angle change rate of the laminated glass 10, and reducing the production difficulty of the laminated glass 10. It should be noted that the maximum local range value AWU of the set of the plurality of first theoretical wedge angle values and the plurality of second theoretical wedge angle values refers to the maximum value in the local range value of the set, wherein the local range value of the set is the difference between the maximum value and the minimum value of the plurality of first theoretical wedge angle values and the plurality of second theoretical wedge angle values at a position with a distance X from the bottom edge 10b of the laminated glass. The overall range value ACU of the set of the plurality of first theoretical wedge angle values and the plurality of second theoretical wedge angle values refers to the difference between the maximum value and the minimum value of all first theoretical wedge angle values and all second theoretical wedge angle values in the set.

[0231] In the embodiment, the wedge angle value of the second projection display area 412 which is different from the first projection display area 411 is designed, for example, the first projection display area 411 is used for AR-HUD, and the second projection display area 412 is used for W-HUD. Specifically, the design method of the head-up display system 1 further includes S31, S32, S33, S34, S35 and S36. Next, steps S31, S32, S33, S34, S35 and S36 are described in detail.

[0232] S31, the plurality of projection display areas 410 includes at least one second projection display area 412, and the second virtual image surface TB30 is designed according to the second projection image 4121 observed by the observer in the vehicle through each second projection display area 412.

[0233] In the embodiment, the second virtual image surface TB30 is lower than the first virtual image surface TB20.

[0234] S32, the second virtual image surface M30 includes a plurality of second sub-virtual image surfaces TB31 arranged from low to high. Each second sub-virtual image surface TB31 corresponds to a sub-eye box surface EB11.

[0235] In the present embodiment, the second virtual image plane TB30 is closer to the eyebox plane EB10 than the first virtual image plane TB20, and the lower viewing angle of the second virtual image plane TB30 is smaller. In the present embodiment, the plurality of sub-eyebox planes EB11 and the plurality of second sub-virtual image planes TB31 are in a center-symmetrical relationship in terms of height, i.e., the highest sub-eyebox plane EB11 corresponds to the lowest second sub-virtual image plane TB31, and the lowest sub-eyebox plane EB11 corresponds to the highest second sub-virtual image plane TB31.

[0236] S33, selecting an observation point array EB111 on each sub-eyebox plane EB11, and selecting a second virtual image point array TB311 on each second sub-virtual image plane TB31, the line connecting a point in the observation point array EB111 and a point in the second virtual image point array TB311 passes through the corresponding second projection display area 412, and the intersection of the line and the second projection display area 412 is an incident point.

[0237] In the present embodiment, each point in the observation point array EB111 corresponds to the position of the eyes of a simulated observer. Each point in the second virtual image point array TB311 corresponds to a virtual image formed on the second virtual image plane TB30 when a projection light ray is reflected on the laminated glass 10 to a certain point on the eyebox plane EB10. Specifically, each point in the second virtual image point array TB311 corresponds to one or more points in the observation point array EB111, i.e., an observer at different positions on the eyebox plane EB10 can see a virtual image at the same position on the second virtual image plane TB30. In addition, an observer at the same position on the eyebox plane EB10 can see virtual images at different positions on the second virtual image plane TB30.

[0238] S34, calculating a plurality of second theoretical wedge angle values of the laminated glass 10 at the corresponding incident point positions when the second projection image 4121 has no secondary images according to the projection assembly 20, the laminated glass 10, and the plurality of lines.

[0239] In the present embodiment, in each of the corresponding arranged sub-eyebox planes EB11 and second sub-virtual image planes TB31, the line connecting each point in the observation point array EB111 and each point in the second virtual image point array TB311 intersects the laminated glass 10, i.e., an incident point. The second theoretical wedge angle value at the incident point when an observer at each point in the observation point array EB111 sees a virtual image on the second sub-virtual image plane TB31 without secondary images is calculated. The number of incident points used for simulation calculation is the number of second theoretical wedge angle values.

[0240] S35, fitting to obtain a second variation curve L2 of wedge angle with the distance from the incident point to the bottom edge 10b of the laminated glass according to the plurality of second theoretical wedge angle values and the distance from the incident point to the bottom edge 10b of the laminated glass corresponding to each second theoretical wedge angle value.

[0241] S36, determining the wedge angle value of the laminated glass 10 in the corresponding second projection display area 412 according to the second variation curve L2.

[0242] In the embodiment, the wedge angle value of the laminated glass 10 in the corresponding second projection display area 412 is determined through the second variation curve L2 to weaken the imaging secondary image phenomenon of the laminated glass 10 in the second projection display area 412. Specifically, through the selected design of the second virtual image plane TB30, the distribution of the plurality of second theoretical wedge angle values of the second projection display area 412 in the laminated glass 10 can be calculated, and the second variation curve L2 corresponding to the second projection display area 412 can be fitted to determine the wedge angle value of the laminated glass 10 in the corresponding second projection display area 412.

[0243] Please refer to Figure 31 , Figure 31 The first variation curve and the second variation curve provided in the embodiment of the present application are schematic diagrams for optimization. In the embodiment, when the maximum deviation value of the adjacent first variation curve L1 and the second variation curve L2 is greater than 0.2 mrad, the distance between the eyebox plane EB10 and the first virtual image plane TB20 corresponding to the first variation curve L1 is reduced, and / or the distance between the eyebox plane EB10 and the second virtual image plane TB30 corresponding to the second variation curve L2 is increased.

[0244] In the embodiment, when the adjacent first variation curve L1 and the second variation curve L2 have an overlapping part on the X-axis, the maximum deviation value AXmax is equal to the maximum value of the wedge angle difference between the first variation curve L1 and the second variation curve L2 in the overlapping part; when the adjacent first variation curve L1 and the second variation curve L2 have no overlapping part on the X-axis, the maximum deviation value AXmax is equal to the difference between the wedge angle values of the two most adjacent ends of the first variation curve L1 and the second variation curve L2.

[0245] When the maximum deviation value AXmax is greater than 0.2 mrad, the distance between the eyebox surface EB10 and the first virtual image surface TB20 corresponding to the adjacent first variation curve L1, and / or the distance between the eyebox surface EB10 and the second virtual image surface TB30 corresponding to the second variation curve L2, is adjusted to adjust the maximum deviation value AXmax of the adjacent first variation curve L1 and the second variation curve L2 to be less than or equal to 0.2 mrad, or less than or equal to 0.15 mrad, or less than or equal to 0.10 mrad, or less than or equal to 0.08 mrad, or less than or equal to 0.05 mrad.

[0246] Specifically, in an embodiment, by reducing the distance between the first virtual image surface TB20 and the eyebox surface EB10, the designed plurality of first theoretical wedge angle values are made larger, so that the first variation curve L1 is closer to the second variation curve L2, thereby reducing the maximum deviation value of the first variation curve L1 and the second variation curve L2, so that the adjacent first variation curve L1 and the second variation curve L2 are closer to the design target. In another embodiment, by increasing the distance between the second virtual image surface TB30 and the eyebox surface EB10, the designed plurality of second theoretical wedge angle values are made smaller, so that the second variation curve L2 is closer to the first variation curve L1, thereby reducing the maximum deviation value of the first variation curve L1 and the second variation curve L2, so that the adjacent first variation curve L1 and the second variation curve L2 are closer to the design target. In yet another embodiment, the distance between the first virtual image surface TB20 and the eyebox surface EB10 is reduced, and the distance between the second virtual image surface TB30 and the eyebox surface EB10 is increased, so that the designed plurality of first theoretical wedge angle values are made larger, and the designed plurality of second theoretical wedge angle values are made smaller, so that the adjacent first variation curve L1 and the second variation curve L2 are closer to each other, so that the adjacent first variation curve L1 and the second variation curve L2 are closer to the design target.

[0247] In an embodiment, the "design virtual image surface" includes setting the ratio of the height to the width of the virtual image surface (first virtual image surface TB20) to be less than or equal to 0.5.

[0248] It can be understood that, in the embodiment, the height and the width of the first virtual image surface TB20 have an impact on the wedge-shaped cross-sectional shape at different positions in the first projection display area 411, and the height of the first virtual image surface TB20 has a greater impact on the wedge-shaped cross-sectional shape at different positions in the first projection display area 411. Since the ratio of the height to the width of the first virtual image surface TB20 is less than or equal to 0.5, the height ratio of the first virtual image surface TB20 is greatly reduced, thereby improving the discrete state of the wedge angle scatter point data set.

[0249] In an embodiment, the design method of the head-up display system further comprises: drawing a scatter point distribution diagram of the theoretical wedge angle values in the XY coordinate system according to the plurality of theoretical wedge angle values and the distance from the corresponding incident point to the bottom edge 10b of the laminated glass 10; the scatter point distribution diagram has an inclined median line, the projection length of the median line on the X axis is L, and the scatter point distribution diagram also has the projection length W of the height and the width of the virtual image surface (the first virtual image surface TB20) on the X axis, and W / L≤1.2.

[0250] In the embodiment, W is the sum of Wm_C, Wm_L and Wm_R, and L is the projection length of the corresponding L_mid or L_tall or L_short on the X axis. From each wedge angle scatter point data set block, the smaller the block width perpendicular to the direction of L_mid, L_tall and L_short, the smaller the maximum local range value of the wedge angle scatter point data set at the corresponding position of the laminated glass 10. Then, in the direction along the bottom edge 10b of the laminated glass 10 upwards, the smaller the ratio of the projection length of the first virtual image surface TB20 on the laminated glass 10 to the projection length of the median line of the corresponding wedge angle scatter point data block on the X axis, that is, the smaller the W / L, the better.

[0251] It can be understood that, in the embodiment, the ratio of the projection length of the first virtual image surface TB20 on the laminated glass 10 to the projection length of the median line of the corresponding wedge angle scatter point data block on the X axis is W / L≤1.2. In other possible embodiments, the value of W / L can be smaller, which is not limited in the application.

[0252] In an embodiment, the eyebox surface EB10 comprises a plurality of sub-eyebox surfaces EB11 in turn from high to low, and the first virtual image surface TB20 comprises a plurality of first sub-virtual image surfaces TB21 in turn from low to high, each first sub-virtual image surface TB21 corresponds to a sub-eyebox surface EB11, and the connection between the midpoint of the sub-eyebox surface EB11 and the midpoint of the corresponding first sub-virtual image surface TB21 is the principal axis, and the intersection of the principal axes corresponding to any two adjacent sub-eyebox surfaces EB11 is located on the outside of the vehicle.

[0253] Specifically, the influence of the intersection of the principal optical axes corresponding to any two adjacent sub-eye box surfaces EB11 on the wedge angle value at different positions of the laminated glass 10 is described above and will not be repeated here.

[0254] In an embodiment, the distance from the intersection of the principal optical axes corresponding to any two adjacent sub-eye box surfaces EB11 to the first surface 110 of the laminated glass 10 is 10-1000 mm.

[0255] In the embodiment, the distance from the intersection of the principal optical axes corresponding to any two adjacent sub-eye box surfaces EB11 to the first surface 110 of the laminated glass 10 is 10-1000 mm; optionally, the distance from the intersection of the principal optical axes corresponding to any two adjacent sub-eye box surfaces EB11 to the first surface 110 of the laminated glass 10 is 40-800 mm; further, the distance from the intersection of the principal optical axes corresponding to any two adjacent sub-eye box surfaces EB11 to the first surface 110 of the laminated glass 10 is 100-600 mm, which is not limited in the application.

[0256] In an embodiment, the design method of the head-up display system further comprises: setting the radius of curvature R along the longitudinal direction or the transverse direction in the projection display area 410 of the laminated glass 10 to change monotonically, and the change rate of the radius of curvature R is-20% to +20%.

[0257] It can be understood that as the radius of curvature R along the longitudinal direction or the transverse direction increases, the wedge angle value of the image viewed by the plurality of eye box surfaces EB10 without secondary images decreases. By increasing the radius of curvature R along the longitudinal direction or the transverse direction, the wedge angle value of the secondary image is reduced, and the discrete state of the wedge angle scatter data set can be improved.

[0258] Although the embodiments of the application have been shown and described above, it can be understood that the above-described embodiments are exemplary and should not be construed as limiting the application. Those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the application, and these improvements and refinements are also considered as the protection scope of the application.

Claims

1. A heads-up display system, characterized by, The head-up display system comprises a laminated glass and a projection assembly; The laminated glass comprises: a first transparent substrate having a first surface and a second surface; a second transparent substrate having a third surface and a fourth surface; and an intermediate bonding layer provided between the first transparent substrate and the second transparent substrate and used for bonding the second surface and the third surface; The laminated glass has at least one projection display area, the projection display area has a wedge-shaped cross-sectional shape with an upper side edge thickness greater than a lower side edge thickness when the laminated glass is installed on a vehicle, the projection display area has a section with a continuously non-linearly monotonically decreasing wedge angle from the lower side edge to the upper side edge, and a ratio of a length of the section to a length of the projection display area is not less than 70%. The projection assembly comprises at least one projection light source capable of projecting to the at least one projection display area, and projection light emitted by the projection light source forms a projection image after being incident on the projection display area. The laminated glass has a plurality of projection display areas, the plurality of projection display areas include at least one first projection display area, and projection light emitted by the projection light source forms a first projection image after being incident on the first projection display area. The plurality of projection display areas further include at least one second projection display area, and projection light emitted by the projection light source forms a second projection image after being incident on the second projection display area. The first projection image has a first lower visual angle LDA1 and a first virtual image distance VID1, the second projection image has a second lower visual angle LDA2 and a second virtual image distance VID2, when the first projection display area and the second projection display area are adjacently arranged in a direction in which a bottom edge of the laminated glass points to a top edge of the laminated glass, LDA1 and LDA2 satisfy: 2°≤LDA1-LDA2≤4.5°, and VID1 and VID2 satisfy: 2≤VID1 / VID2≤50.

2. The heads-up display system of claim 1, wherein, A maximum change rate ROC of the wedge angle continuously non-linearly monotonically decreasing in the projection display area: ROC≤0.3mrad / 100mm; or, ROC≤0.2mrad / 100mm; or, ROC≤0.1mrad / 100mm; or, ROC≤0.05mrad / 100mm.

3. The heads-up display system of claim 1, wherein, A measured wedge angle is obtained at any point position in the section, a fitting curve of an actual wedge angle is obtained by fitting the measured wedge angles at the point positions in the section, a plurality of theoretical wedge angle values eliminating a secondary image are obtained at any point position in the projection display area, a first change curve is obtained by fitting the plurality of theoretical wedge angle values at the point positions in the projection display area, and a maximum deviation value of corresponding parts of the fitting curve of the actual wedge angle and the first change curve is less than or equal to 0.15mrad.

4. The heads-up display system of claim 3, wherein, Both the fitting curve of the actual wedge angle and the first change curve conform to a 2-5 order function.

5. The heads-up display system of claim 3, wherein, A slope of a tangent line of any point on the fitting curve of the actual wedge angle continuously decreases from the lower side edge to the upper side edge.

6. The heads-up display system of claim 3, wherein, A slope of a tangent line of any point on the fitting curve of the actual wedge angle continuously increases from the lower side edge to the upper side edge.

7. The heads-up display system of claim 3, wherein, The slope of the tangent line of any point on the actual wedge angle fitting curve first continuously increases and then continuously decreases from the lower side to the upper side.

8. The heads-up display system of claim 3, wherein, The ratio of the maximum local range value AW of the plurality of theoretical wedge angle values to the overall range value AC of the plurality of theoretical wedge angle values is AW / AC≤0.

9.

9. The heads-up display system of claim 1, wherein, The virtual image distance VID1 of the first projection image is 7 meters-100 meters.

10. The heads-up display system of claim 9, wherein, The virtual image distance VID2 of the second projection image is 1 meter-6 meters.

11. The heads-up display system of claim 10, wherein, When the first projection display area and the second projection display area are arranged adjacent in the direction in which the bottom edge of the laminated glass points to the top edge of the laminated glass, LDA1 and LDA2 satisfy 2.5°≤LDA1-LDA2≤3.5°, and VID1 and VID2 satisfy 2.5≤VID1 / VID2≤10.

12. The heads-up display system of claim 10, wherein, The wedge angle of the first projection display area ranges from 0 mrad to 0.5 mrad, and the wedge angle of the second projection display area ranges from 0.1 mrad to 0.8 mrad.

13. The heads-up display system of claim 9, wherein, The head-up display system defines a virtual eyebox surface located inside the vehicle and at least one virtual virtual image surface located outside the vehicle, each of the projection display areas corresponds to a virtual image surface, and the ratio of the height to the width of the virtual image surface is less than or equal to 0.

5.

14. The heads-up display system of claim 13, wherein, The angle between the virtual image surface and the eyebox surface is ≤10°.

15. The heads-up display system of claim 13, wherein, The eyebox surface includes a plurality of sub-eyebox surfaces in order from high to low, and the virtual image surface includes a plurality of sub-virtual image surfaces in order from low to high, each of the sub-virtual image surfaces corresponds to a sub-eyebox surface, the connection line between the midpoint of the sub-eyebox surface and the midpoint of the corresponding sub-virtual image surface is the main optical axis, and the intersection point of the main optical axes corresponding to any two adjacent sub-eyebox surfaces is located outside the vehicle.

16. The heads-up display system of claim 15, wherein, The distance from the intersection point of the main optical axes corresponding to any two adjacent sub-eyebox surfaces to the first surface of the laminated glass is 10mm-1000mm.

17. The heads-up display system of claim 1, wherein, The radius of curvature R along the longitudinal direction and / or the transverse direction in the projection display area changes monotonously, and the change rate of the radius of curvature R is -20% to +20%.

18. The heads-up display system of claim 17, wherein, The radius of curvature R along the longitudinal direction is greater than or equal to 5000mm, and the radius of curvature R along the transverse direction is 1500mm-4000mm.

19. The heads-up display system of claim 1, wherein, The laminated glass has a functional area for signal transmission of sensors, and the functional area has a wedge-shaped cross-sectional shape with a fixed wedge angle or a linearly changing wedge angle.

20. A method of designing a heads-up display system, characterized by: The design method of the head-up display system includes: Providing a projection assembly and a laminated glass, the projection light emitted by the projection assembly is incident on at least one projection display area on the laminated glass; Determining an eyebox surface located inside the vehicle; Designing a virtual image surface; The eyebox surface includes a plurality of sub-eyebox surfaces in order from high to low, and the virtual image surface includes a plurality of sub-virtual image surfaces in order from low to high, each of the sub-virtual image surfaces corresponds to a sub-eyebox surface; Selecting an observation point array on each sub-eyebox surface and selecting a virtual image point array on each sub-virtual image surface, the connection line between the points in the observation point array and the points in the virtual image point array passes through the corresponding projection display area, and the intersection point of the connection line and the projection display area is an incident point; According to the projection assembly, the laminated glass and a plurality of lines, a plurality of first theoretical wedge angle values of the laminated glass at corresponding positions of the incident points when the projection image has no secondary image are calculated; According to the plurality of first theoretical wedge angle values and the distance from the incident point to the bottom edge of the laminated glass corresponding to each of the first theoretical wedge angle values, a first change curve of the wedge angle with the distance from the incident point to the bottom edge of the laminated glass is fitted; and According to the first change curve, the wedge angle value of the laminated glass at the corresponding projection display area is determined.

21. The design method of a head-up display system according to claim 20, wherein, The eyebox surface comprises a first sub-eyebox surface, a second sub-eyebox surface and a third sub-eyebox surface in turn from high to low; and the plurality of sub-virtual image surfaces comprises a first low virtual image surface, a first middle virtual image surface and a first high virtual image surface in turn from low to high. The "selecting an observation point array on each sub-eyebox surface and selecting a virtual image point array on each sub-virtual image surface" comprises: selecting a first sub-observation point array m1*n1 on the first sub-eyebox surface, a second sub-observation point array m2*n2 on the second sub-eyebox surface and a third sub-observation point array m3*n3 on the third sub-eyebox surface, wherein m1, m2 and m3 are natural numbers greater than or equal to 1, and n1, n2 and n3 are natural numbers greater than or equal to 1; and selecting a first low virtual image point array i1*j1 on the first low virtual image surface, a first middle virtual image point array i2*j2 on the first middle virtual image surface and a first high virtual image point array i3*j3 on the first high virtual image surface, wherein i1, i2 and i3 are natural numbers greater than or equal to 1, and j1, j2 and j3 are natural numbers greater than or equal to 1.

22. The design method of a head-up display system according to claim 21, wherein The "calculating a plurality of first theoretical wedge angle values of the laminated glass at corresponding positions of the incident points when the projection image has no secondary image according to the projection assembly, the laminated glass and a plurality of lines" comprises: calculating a plurality of first sub-theoretical wedge angle values of the laminated glass at corresponding positions of the incident points when the projection image has no secondary image according to the projection assembly, the laminated glass and a line connecting each point in the first sub-observation point array with each point in the first low virtual image point array; calculating a plurality of second sub-theoretical wedge angle values of the laminated glass at corresponding positions of the incident points when the projection image has no secondary image according to the projection assembly, the laminated glass and a line connecting each point in the second sub-observation point array with each point in the first middle virtual image point array; and calculating a plurality of third sub-theoretical wedge angle values of the laminated glass at corresponding positions of the incident points when the projection image has no secondary image according to the projection assembly, the laminated glass and a line connecting each point in the third sub-observation point array with each point in the first high virtual image point array.

23. The design method of a head-up display system according to claim 20, wherein The ratio of the maximum local range value AW of the plurality of first theoretical wedge angle values to the overall range value AC of the plurality of first theoretical wedge angle values is AW / AC≤0.

9.

24. The design method of a head-up display system according to claim 20, wherein, The distance between the plurality of virtual image surfaces and the eyebox surface increases in the direction from the bottom edge to the top edge of the laminated glass.

25. The design method of a head-up display system according to claim 20, wherein, The projection display area includes at least two first projection display areas, and fitting obtains at least two first variation curves of the wedge angle with the distance from the incident point to the bottom edge of the laminated glass. When the maximum deviation value of the adjacent two first variation curves is greater than 0.15 mrad, after "determining the wedge angle value of the laminated glass in the corresponding first projection display area according to the first variation curve", the design method of the head-up display system further comprises: Adjusting the distance between the eyebox surface and the corresponding virtual image surface of one of the adjacent two first variation curves; Recalculating to obtain a new plurality of first theoretical wedge angle values; According to the new plurality of first theoretical wedge angle values and the distance from the incident point to the bottom edge of the laminated glass corresponding to each first theoretical wedge angle value, fitting is performed to obtain new first variation curves of the wedge angle with the distance from the incident point to the bottom edge of the laminated glass; and Determine whether the maximum deviation value of the new first variation curve and the other of the adjacent two first variation curves is greater than 0.15 mrad; If yes, repeat the above steps; If not, determine the wedge angle value of the laminated glass in the corresponding projection display area according to the new first variation curve.

26. The design method of a head-up display system according to claim 20, wherein, The "design virtual image surface" comprises: The height-width ratio of the virtual image surface is less than or equal to 0.

5.

27. The design method of a head-up display system according to claim 20, wherein, The design method of the head-up display system further comprises: According to the plurality of first theoretical wedge angle values and the distance from the incident point to the bottom edge of the laminated glass corresponding to each first theoretical wedge angle value, a theoretical wedge angle value scatter plot is drawn in an XY coordinate system; The scatter plot has an inclined median line, the projection length of the median line on the X-axis is L, and the scatter plot also has a virtual image surface with a height and a width, and the projection length of the virtual image surface on the X-axis is W, and W / L≤1.

2.

28. The design method of a head-up display system according to claim 20, wherein, The connection between the midpoint of the sub-eyebox surface and the midpoint of the corresponding sub-virtual image surface is the main optical axis, and the intersection point of the main optical axes corresponding to any adjacent two sub-eyebox surfaces is located on the outside of the vehicle.

29. The design method of a head-up display system according to claim 28, wherein, The distance from the intersection point of the main optical axes corresponding to any adjacent two sub-eyebox surfaces to the first surface of the laminated glass is 10mm-1000mm.

30. The design method of a head-up display system according to claim 20, wherein, The design method of the head-up display system further comprises: The curvature radius R in the projection display area of the laminated glass along the longitudinal direction or the transverse direction is set to monotonically change, and the change rate of the curvature radius R is-20% to +20%.

Images