Head-up display system and design method of head-up display system

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 has at least one projection display area. Each 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 area has a section with a wedge angle continuously decreasing from the lower side to the upper side. The section has a plurality of theoretical wedge angle values at any point position for measuring the wedge angle and eliminating reflection ghosting. The measured wedge angle at each point position in the section is fitted to obtain an actual wedge angle fitting curve. The actual wedge angle fitting curve has a continuous curve accommodated in a preset area. The projection assembly comprises at least one projection light source capable of projecting onto the at least one projection display area. The projection light emitted by the projection light source is incident on the projection display area to form a projection image. The head-up display system provided by the application can weaken or even eliminate the reflection ghosting of the head-up display image in multi-point dynamic observation.

Description

Technical Field

[0001] This application relates to the automotive field, specifically to a head-up display system and a design method for such a system. Background Technology

[0002] With the development of automotive intelligence, Head-Up Display (HUD) systems are increasingly being used in automobiles. These systems display images, such as driving information, in real time in front of the windshield. When a vehicle travels on a slope or uneven road surface, it experiences some degree of bumps, causing the driver's eyes to shift relative to the road surface. This results in ghosting or enhanced ghosting of the HUD image observed by the driver, which is equivalent to viewing the HUD image from a position higher or lower than a specific eye level. This type of ghosting is called overall dynamic ghosting.

[0003] In addition, during the actual manufacturing process of laminated glass, the wedge angle curve of the intermediate wedge-shaped PVB film is not ideally smooth. Its local fluctuations can also cause uneven distribution of ghosting on the same virtual image plane. Ghosting or enhanced ghosting may occur in local positions of the HUD image observed by the driver. This type of ghosting is called local dynamic ghosting.

[0004] The above-mentioned overall dynamic ghosting and local dynamic ghosting are collectively referred to as dynamic ghosting. The size of the ghosting on the HUD image changes dynamically as the driver's eyes move, which causes the HUD image to appear as ghosting or more severe ghosting in actual use, affecting the driving experience. Summary of the Invention

[0005] In a first aspect, embodiments of this application provide a head-up display system, the head-up display system including laminated glass and a projection component;

[0006] The laminated glass has at least one projection display area, each of the projection display areas having a wedge-shaped cross-section where the thickness of the upper side is greater than the thickness of the lower side when the laminated glass is installed in a vehicle, and having a segment where the wedge angle continuously decreases from the lower side to the upper side, and having multiple theoretical wedge angle values ​​for measuring the wedge angle and eliminating reflection ghosting at any point in the segment;

[0007] The measured wedge angles at each point within the segment are fitted to obtain the actual wedge angle fitting curve. Multiple limiting points are calculated based on multiple theoretical wedge angle values ​​at each point within the segment and the distance from the incident point to the bottom edge of the laminated glass corresponding to each theoretical wedge angle value. The multiple limiting points are connected sequentially to form a preset area. The actual wedge angle fitting curve is a continuous curve contained within the preset area.

[0008] 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 to the projection display area.

[0009] In a second aspect, the embodiments of the present application further provide a design method of a head-up display system, the design method of the head-up display system comprising:

[0010] 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;

[0011] The eyebox surface in the vehicle is designed according to an observer in the vehicle;

[0012] The virtual image surface is designed according to a projection image observed by each projection display area through the observer in the vehicle;

[0013] The eyebox surface comprises a plurality of sub-eyebox surfaces in turn from low to high, and the virtual image surface comprises a plurality of sub-virtual image surfaces in turn from high to low, wherein each sub-virtual image surface corresponds to a sub-eyebox surface;

[0014] 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 the corresponding projection display area, and an intersection of the line and the projection display area is an incident point;

[0015] A plurality of theoretical wedge angle values of the laminated glass when there is no reflection ghosting of the projection image at the corresponding incident point position are calculated according to the projection assembly, the laminated glass and the plurality of lines;

[0016] A first change curve of the wedge angle with respect to the distance of the incident point to the bottom edge of the laminated glass is fitted according to the plurality of theoretical wedge angle values and the distance of the incident point corresponding to each theoretical wedge angle value to the bottom edge of the laminated glass;

[0017] A plurality of limit points are calculated according to the plurality of theoretical wedge angle values and the distance of the incident point corresponding to each theoretical wedge angle value to the bottom edge of the laminated glass, and the plurality of limit points are sequentially connected to form a preset area;

[0018] The first change curve is adjusted, and the adjusted first change curve has a continuous curve accommodated in the preset area;

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

[0020] Figure 1 A structural schematic diagram of a head-up display system provided by an embodiment of the present application is provided;

[0021] Figure 2 For Figure 1 An imaging diagram of a projected image in a head-up display system according to an embodiment;

[0022] Figure 3 For Figure 1 A fitting curve of an actual wedge angle of a projection display area in a head-up display system according to an embodiment;

[0023] Figure 4 For Figure 1 A diagram of dynamic observation of a projected image in a head-up display system according to an embodiment;

[0024] Figure 5 For Figure 4 A diagram of a fitting curve of an actual wedge angle of a projection display area in a head-up display system according to an embodiment and a preset area;

[0025] Figure 6 For Figure 4 A diagram of a fitting curve of an actual wedge angle of a projection display area in a head-up display system according to another embodiment and a preset area;

[0026] Figure 7 For Figure 4 A diagram of a fitting curve of an actual wedge angle of a projection display area in a head-up display system according to still another embodiment and a preset area;

[0027] Figure 8 For Figure 4 A diagram of a fitting curve of an actual wedge angle of a projection display area in a head-up display system according to still another embodiment and a preset area;

[0028] Figure 9 For Figure 4 A diagram of a fitting curve of an actual wedge angle of a projection display area in a head-up display system according to still another embodiment and a preset area;

[0029] Figure 10 A structural diagram of a head-up display system according to still another embodiment of the present application;

[0030] Figure 11 For Figure 10 A diagram of projection imaging in a head-up display system according to an embodiment;

[0031] Figure 12 A structural diagram of a head-up display system according to still another embodiment of the present application;

[0032] Figure 13 A flowchart of a design method of a head-up display system according to an embodiment of the present application;

[0033] Figure 14 For Figure 13 The schematic diagram of the design method of the head-up display system provided by the embodiment;

[0034] Figure 15 For Figure 13 The schematic diagram of the first variation curve in the design method of the head-up display system provided by the embodiment;

[0035] Figure 16 For Figure 14 The design schematic diagram of the eyebox surface and the virtual image surface in the design method of the head-up display system provided by the embodiment;

[0036] Figure 17 For Figure 16 The schematic diagram of the adjusted first variation curve in the design method of the head-up display system provided by the embodiment;

[0037] Figure 18 For Figure 17 The schematic diagram of the first variation curve adjusted again in the design method of the head-up display system provided by the embodiment;

[0038] Figure 19 For Figure 18 The schematic diagram of the first variation curve adjusted again in the design method of the head-up display system provided by the embodiment;

[0039] Figure 20 For Figure 19 The schematic diagram of the adjusted first variation curve passing through the seventh limiting point in the design method of the head-up display system provided by the embodiment;

[0040] Figure 21 For Figure 19 The schematic diagram of the adjusted first variation curve passing through the eighth limiting point in the design method of the head-up display system provided by the embodiment;

[0041] Figure 22 For Figure 13 The schematic diagram of the adjusted first variation curve for the adjacent two first variation curves of the same kind of projection display area in the design method of the head-up display system provided by the embodiment;

[0042] Figure 23 For Figure 13 The schematic diagram of the adjusted first variation curve for the adjacent two first variation curves of different kinds of projection display area in the design method of the head-up display system provided by the embodiment;

[0043] Figure 24 The design schematic diagram of the observation point array and the virtual image point array in the design method of the head-up display system provided by the embodiment;

[0044] Figure 25 ForFigure 24 The theoretical wedge angle distribution of the second virtual image plane without ghosting, observed on the vertical line of the midline of the second sub-eye box surface in the design method of the head-up display system provided in the implementation method;

[0045] Figure 26 for Figure 24 The design method of the head-up display system provided in the implementation method is a scatter plot of the theoretical wedge angle distribution of the three virtual image planes without ghosting, observed from the vertical line of the three sub-eye box planes.

[0046] Reference numerals: Head-up display system 1; Laminated glass 10; Projection assembly 20; Projection display area 11; Bottom edge 12; Top edge 13; Projection light source 21; Lower side edge 111; Upper side edge 112; Section 113; First projection display area 114; Second projection display area 115; Projected image 211; First projection light source 212; Second projection light source 213; First sub-projected image 2111; Second sub-projected image 2112; Third sub-projected image 2113; First projection image 2121; Second projection image 2131; Actual wedge angle fitting curve L0; First variation curve L10; Adjusted first variation curve L11; Adjusted new first variation curve L12; Eye box EB; First eye box EB_S; Second eye box EB_M; Third eye box EB_T; Preset area S0; New preset area S1; First limit Locus P1; Second confined locus P2; Third confined locus P3; Fourth confined locus P4; Fifth confined locus P5; Sixth confined locus P6; Seventh confined locus G; Eighth confined locus P8; First confined segment P1-P4; Second confined segment P2-P3; Eyebox surface EB10; Sub-eyebox surface EB11; First sub-eyebox surface EB12; Second sub-eyebox surface EB13; Third sub-eyebox surface EB14; Observation array EB111; First sub-observation array EB121; Second sub-observation array EB131; Third sub-observation array EB141; Virtual image surface TB10; Sub-virtual image surface TB11; First sub-virtual image surface TB12; Second sub-virtual image surface TB13; Third sub-virtual image surface TB14; Virtual image array TB111; First sub-virtual image array TB121; Second sub-virtual image array TB131; Third sub-virtual image array TB141. Detailed Implementation

[0047] In a first aspect, embodiments of this application provide a head-up display system, the head-up display system including laminated glass and a projection component;

[0048] The laminated glass has at least one projection display area, each of the projection display areas having a wedge-shaped cross-section where the thickness of the upper side is greater than the thickness of the lower side when the laminated glass is installed in a vehicle, and having a segment where the wedge angle continuously decreases from the lower side to the upper side, and having multiple theoretical wedge angle values ​​for measuring the wedge angle and eliminating reflection ghosting at any point in the segment;

[0049] The measured wedge angles at the positions of the points in the section are fitted to obtain an actual wedge angle fitting curve, a plurality of limit points are calculated according to a plurality of theoretical wedge angle values at the positions of the points in the section and distances from the incident points corresponding to the theoretical wedge angle values to the bottom edge of the laminated glass, and the plurality of limit points are sequentially connected to form a preset area, and the actual wedge angle fitting curve has a continuous curve accommodated in the preset area.

[0050] 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 by being incident to the projection display area.

[0051] The plurality of theoretical wedge angle values at the positions of the points in the section are fitted to obtain a first variation curve, and a maximum deviation value of the actual wedge angle fitting curve and the first variation curve is less than or equal to 0.15 mrad.

[0052] The wedge angle in the section continuously and nonlinearly decreases from the lower side to the upper side, and the actual wedge angle fitting curve and the first variation curve both conform to a 1-4 order function.

[0053] The head-up display system comprises a first eye box, a second eye box and a third eye box from low to high, and the projection image comprises a first sub-projection image, a second sub-projection image and a third sub-projection image from high to low.

[0054] The preset area is a polygon, and the plurality of limit points comprise a first limit point, a second limit point, a third limit point and a fourth limit point.

[0055] A first connecting line is obtained by connecting a bottom point of a median line of the first eye box and a center point of the first sub-projection image, coordinate information of the first limit point comprises a distance from an intersection point of the first connecting line and the projection display area to the bottom edge of the laminated glass, and a theoretical wedge angle value without reflection ghosting is obtained by observing the center point of the first sub-projection image from the bottom point of the median line of the first eye box.

[0056] A second connecting line is obtained by connecting a top point of a median line of the second eye box and a top-left corner point of the second sub-projection image, coordinate information of the second limit point comprises a distance from an intersection point of the second connecting line and the projection display area to the bottom edge of the laminated glass, and a theoretical wedge angle value without reflection ghosting is obtained by observing the top-left corner point of the second sub-projection image from the top point of the median line of the second eye box.

[0057] a third line is drawn from the top point of the median line of the third eyebox to the center point of the third sub-projected image, and the coordinate information of the third limiting point includes a distance from the intersection point of the third line and the projection display area to the bottom edge of the laminated glass, and a theoretical wedge angle value without reflection ghosting when the center point of the third sub-projected image is observed from the top point of the median line of the third eyebox;

[0058] a fourth line is drawn from the bottom point of the median line of the second eyebox to the lower right corner point of the second sub-projected image, and the coordinate information of the fourth limiting point includes a distance from the intersection point of the fourth line and the projection display area to the bottom edge of the laminated glass, and a theoretical wedge angle value without reflection ghosting when the lower right corner point of the second sub-projected image is observed from the bottom point of the median line of the second eyebox.

[0059] The plurality of limiting points further include a fifth limiting point and a sixth limiting point, and the preset area is formed by sequentially connecting the first limiting point, the fifth limiting point, the second limiting point, the third limiting point, the sixth limiting point and the fourth limiting point.

[0060] a fifth line is drawn from the top point of the median line of the first eyebox to the center point of the first sub-projected image, and the coordinate information of the fifth limiting point includes a distance from the intersection point of the fifth line and the projection display area to the bottom edge of the laminated glass, and a theoretical wedge angle value without reflection ghosting when the center point of the first sub-projected image is observed from the top point of the median line of the first eyebox.

[0061] a sixth line is drawn from the bottom point of the median line of the third eyebox to the center point of the third sub-projected image, and the coordinate information of the sixth limiting point includes a distance from the intersection point of the sixth line and the projection display area to the bottom edge of the laminated glass, and a theoretical wedge angle value without reflection ghosting when the center point of the third sub-projected image is observed from the bottom point of the median line of the third eyebox.

[0062] The first limiting point and the fourth limiting point form a first limiting line segment, the second limiting point and the third limiting point form a second limiting line segment, the actual wedge angle fitting curve intersects the first limiting line segment, and / or the actual wedge angle fitting curve intersects the second limiting line segment.

[0063] The actual wedge angle fitting curve passes through a seventh limiting point, and the seventh limiting point is a barycenter of a plurality of theoretical wedge angle values without reflection ghosting corresponding to each point of the median line of the second eyebox when the second sub-projected image is observed.

[0064] The actual wedge angle fitting curve passes through an eighth limiting point, a midpoint of a median line of the second eyebox and a center point of the second sub-projection image are connected to obtain an eighth connecting line, and the coordinate information of the eighth limiting point includes a distance from an intersection point of the eighth connecting line and the projection display area to the bottom edge of the laminated glass and a theoretical wedge angle value without reflection ghost observed from the midpoint of the median line of the second eyebox to the center point of the second sub-projection image.

[0065] The ratio of the length of the segment to the length of the projection display area is not less than 70% in the direction from the bottom edge of the laminated glass to the top edge.

[0066] The at least one projection display area includes:

[0067] The at least one first projection display area, the projection light source is incident to the first projection display area to form a first projection image, and the virtual image distance of the first projection image is 7 meters-100 meters;

[0068] The at least one second projection display area, the projection light source is incident to the second projection display area to form a second projection image, and the virtual image distance of the second projection image is 1 meter-6 meters.

[0069] The projection assembly includes at least one first projection light source and at least one second projection light source, the first projection light source is incident to the first projection display area, and the second projection light source is incident to the second projection display area.

[0070] In a second aspect, the embodiments of the present application also provide a design method of a head-up display system, the design method of the head-up display system includes:

[0071] Providing a projection assembly and a laminated glass, the projection light emitted by the projection assembly is incident to at least one projection display area on the laminated glass;

[0072] Designing an eyebox surface in the vehicle according to an observer in the vehicle;

[0073] Designing a virtual image surface according to the projection image observed by each projection display area by the observer in the vehicle;

[0074] The eyebox surface includes a plurality of sub-eyebox surfaces in turn from low to high, and the virtual image surface includes a plurality of sub-virtual image surfaces in turn from high to low, wherein each sub-virtual image surface corresponds to a sub-eyebox surface;

[0075] Selecting an observation point array on each sub-eyebox surface and selecting a virtual image point array on each sub-virtual image surface, the connecting line of 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 connecting line and the projection display area is an incident point;

[0076] calculating a plurality of theoretical wedge angle values of the laminated glass at which the projected image at the corresponding incident point position has no reflection ghost;

[0077] fitting to obtain a first variation curve of the wedge angle with the distance from the incident point to the bottom edge of the laminated glass according to the plurality of theoretical wedge angle values and the distance from the incident point to the bottom edge of the laminated glass corresponding to each of the theoretical wedge angle values;

[0078] calculating a plurality of limit points according to the plurality of theoretical wedge angle values and the distance from the incident point to the bottom edge of the laminated glass corresponding to each of the theoretical wedge angle values, the plurality of limit points being sequentially connected to form a preset area;

[0079] adjusting the first variation curve, so that the adjusted first variation curve has a continuous curve accommodated in the preset area;

[0080] determining the wedge angle value of the laminated glass at the corresponding projection display area according to the adjusted first variation curve.

[0081] wherein the adjusted first variation curve conforms to a 1-4 order function and has a continuous curve with continuously decreasing nonlinearity.

[0082] wherein the eyebox surface comprises a first sub-eyebox surface, a second sub-eyebox surface and a third sub-eyebox surface in turn from low to high, the virtual image surface correspondingly comprises a first sub-virtual image surface, a second sub-virtual image surface and a third sub-virtual image surface in turn from high to low, and the preset area is a polygon and the plurality of limit points comprise a first limit point, a second limit point, a third limit point and a fourth limit point.

[0083] the "calculating a plurality of limit points according to the plurality of theoretical wedge angle values and the distance from the incident point to the bottom edge of the laminated glass corresponding to each of the theoretical wedge angle values" comprises:

[0084] connecting the bottom point of the median line of the first sub-eyebox surface and the center point of the first sub-virtual image surface to obtain a first connecting line intersecting the projection display area at a first incident point, connecting the top point of the median line of the second sub-eyebox surface and the top-left corner point of the second sub-virtual image surface to obtain a second connecting line intersecting the projection display area at a second incident point, connecting the top point of the median line of the third sub-eyebox surface and the center point of the third sub-virtual image surface to obtain a third connecting line intersecting the projection display area at a third incident point, and connecting the bottom point of the median line of the second sub-eyebox surface and the bottom-right corner point of the second sub-virtual image surface to obtain a fourth connecting line intersecting the projection display area at a fourth incident point;

[0085] According to the projection assembly, the laminated glass, the first connecting line, the second connecting line, the third connecting line and the fourth connecting line, a first limiting theoretical wedge angle value of no reflection ghost at the first incident point, a second limiting theoretical wedge angle value of no reflection ghost at the second incident point, a third limiting theoretical wedge angle value of no reflection ghost at the third incident point and a fourth limiting theoretical wedge angle value of no reflection ghost at the fourth incident point are calculated;

[0086] And a first limiting point is obtained according to the first limiting theoretical wedge angle value and the distance from the first incident point to the bottom edge of the laminated glass, a second limiting point is obtained according to the second limiting theoretical wedge angle value and the distance from the second incident point to the bottom edge of the laminated glass, a third limiting point is obtained according to the third limiting theoretical wedge angle value and the distance from the third incident point to the bottom edge of the laminated glass, and a fourth limiting point is obtained according to the fourth limiting theoretical wedge angle value and the distance from the fourth incident point to the bottom edge of the laminated glass.

[0087] Wherein, after the "a first limiting point is obtained according to the first limiting theoretical wedge angle value and the distance from the first incident point to the bottom edge of the laminated glass, a second limiting point is obtained according to the second limiting theoretical wedge angle value and the distance from the second incident point to the bottom edge of the laminated glass, a third limiting point is obtained according to the third limiting theoretical wedge angle value and the distance from the third incident point to the bottom edge of the laminated glass, and a fourth limiting point is obtained according to the fourth limiting theoretical wedge angle value and the distance from the fourth incident point to the bottom edge of the laminated glass", the "a plurality of limiting points are calculated according to the plurality of theoretical wedge angle values and the distance from the incident point corresponding to each of the theoretical wedge angle values to the bottom edge of the laminated glass" further comprises:

[0088] A fifth connecting line is obtained by connecting the top point of the median line of the first sub-eye box face and the center point of the first sub-virtual image face, and the fifth connecting line intersects with the projection display area at a fifth incident point; a sixth connecting line is obtained by connecting the bottom point of the median line of the third sub-eye box face and the center point of the third sub-virtual image face, and the sixth connecting line intersects with the projection display area at a sixth incident point;

[0089] According to the projection assembly, the laminated glass, the fifth connecting line and the sixth connecting line, a fifth limiting theoretical wedge angle value of no reflection ghost at the fifth incident point and a sixth limiting theoretical wedge angle value of no reflection ghost at the sixth incident point are calculated;

[0090] And a fifth limiting point is obtained according to the fifth limiting theoretical wedge angle value and the distance from the fifth incident point to the bottom edge of the laminated glass, and a sixth limiting point is obtained according to the sixth limiting theoretical wedge angle value and the distance from the sixth incident point to the bottom edge of the laminated glass.

[0091] The vertex of the preset area further comprises the fifth limit point and the sixth limit point, and the preset area is formed by the first limit point, the fifth limit point, the second limit point, the third limit point, the sixth limit point and the fourth limit point in sequence.

[0092] The line connecting the first limit point and the fourth limit point is a first limit line segment, and the line connecting the second limit point and the third limit point is a second limit line segment.

[0093] The first change curve is adjusted so that the adjusted first change curve has a continuous curve accommodated in the preset area, and the adjusted first change curve intersects the first limit line segment and / or the adjusted first change curve intersects the second limit line segment.

[0094] The multiple limit points are calculated according to the multiple theoretical wedge angle values and the distances from the incident points corresponding to the theoretical wedge angle values to the bottom edge of the laminated glass.

[0095] The multiple seventh limit theoretical wedge angle values at which there is no reflection ghost at the multiple seventh incident points are calculated according to the projection assembly, the laminated glass and the multiple seventh connecting lines.

[0096] The multiple seventh limit theoretical wedge angle values at which there is no reflection ghost at the multiple seventh incident points are calculated according to the projection assembly, the laminated glass and the multiple seventh connecting lines.

[0097] The scatter point distribution is obtained according to the multiple seventh limit theoretical wedge angle values and the distances from the multiple seventh incident points to the bottom edge of the laminated glass, and the seventh limit point is calculated by taking the center of gravity of the scatter point distribution.

[0098] The first change curve is adjusted so that the adjusted first change curve has a continuous curve accommodated in the preset area, and the adjusted first change curve passes through the seventh limit point.

[0099] The first change curve is adjusted so that the adjusted first change curve has a continuous curve accommodated in the preset area, and the adjusted first change curve passes through the seventh limit point.

[0100] The multiple limit points are calculated according to the multiple theoretical wedge angle values and the distances from the incident points corresponding to the theoretical wedge angle values to the bottom edge of the laminated glass.

[0101] A middle point of a middle perpendicular line connecting the second sub-eye box surface and a center point of the second sub-virtual image surface are connected to obtain an eighth connecting line, and the eighth connecting line intersects the projection display area to obtain an eighth incident point;

[0102] An eighth limiting theoretical wedge angle value without reflection ghost at the eighth incident point is calculated according to the projection assembly, the laminated glass and the eighth connecting line;

[0103] An eighth limiting point is obtained according to the eighth limiting theoretical wedge angle value and a distance from the eighth incident point to a bottom edge of the laminated glass;

[0104] The “adjusting the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area” includes:

[0105] The first change curve is adjusted so that the adjusted first change curve has a continuous curve accommodated in the preset area, and the adjusted first change curve passes through the eighth limiting point.

[0106] 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.

[0107] The at least one projection display area includes at least two first projection display areas or at least two second projection display areas, and at least two adjusted first change curves of wedge angle with respect to the distance from the incident point to the bottom edge of the laminated glass are fitted, and when the maximum deviation value of the adjacent two adjusted first change curves is greater than 0.15 mrad, after the “determining the wedge angle value of the laminated glass in the corresponding projection display area according to the adjusted first change curve”, the design method of the head-up display system further includes:

[0108] Adjusting the distance between the eye box surface and the corresponding virtual image surface of one of the two adjacent adjusted first change curves;

[0109] A new plurality of theoretical wedge angle values are recalculated;

[0110] According to the new plurality of theoretical wedge angle values and the distance from the incident point to the bottom edge of the laminated glass corresponding to each theoretical wedge angle value, a new first change curve of wedge angle with respect to the distance from the incident point to the bottom edge of the laminated glass is fitted, and a new preset area is calculated;

[0111] The new first change curve is adjusted so that the adjusted new first change curve has a continuous curve accommodated in the new preset area;

[0112] and judging whether the maximum deviation value of the adjusted new first variation curve and another of the two adjacent adjusted first variation curves is less than or equal to 0.15 mrad;

[0113] If not, repeat the above steps;

[0114] If yes, determining the wedge angle value of the laminated glass in the corresponding first projection display area or the second projection display area according to the adjusted new first variation curve.

[0115] Wherein, the at least one projection display area includes at least one first projection display area and at least one second projection display area, at least two adjusted first variation curves of wedge angle with the distance of the incident point to the bottom edge of the laminated glass are obtained by fitting, when the maximum deviation value of the two adjacent adjusted first variation curves is greater than 0.2 mrad, after the "determining the wedge angle value of the laminated glass in the corresponding projection display area according to the adjusted first variation curve", the design method of the head-up display system further comprises:

[0116] Adjusting the distance between the eyebox surface and the corresponding virtual image surface of one of the two adjacent adjusted first variation curves;

[0117] Recalculating to obtain a new plurality of theoretical wedge angle values;

[0118] According to the new plurality of theoretical wedge angle values and the distance of the incident point to the bottom edge of the laminated glass corresponding to each theoretical wedge angle value, a new first variation curve of wedge angle with the distance of the incident point to the bottom edge of the laminated glass is fitted, and a new preset area is calculated;

[0119] Adjusting the new first variation curve, so that the adjusted new first variation curve has a continuous curve accommodated in the new preset area;

[0120] And judging whether the maximum deviation value of the adjusted new first variation curve and another of the two adjacent adjusted first variation curves is less than or equal to 0.2 mrad;

[0121] If not, repeat the above steps;

[0122] If yes, determining the wedge angle value of the laminated glass in the corresponding first projection display area or the second projection display area according to the adjusted new first variation curve.

[0123] Wherein, the new plurality of theoretical wedge angle values has a maximum local range value △WU, the new plurality of theoretical wedge angle values has a whole range value △CU, and the ratio of △WU and △CU is: △WU / △CU≤0.9.

[0124] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0125] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0126] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a head-up display system provided in one embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the projection image in the head-up display system provided in the implementation method; Figure 3 for Figure 1 The actual wedge angle fitting curve of the projection display area in the head-up display system provided in this embodiment. In this embodiment, the head-up display system 1 includes a laminated glass 10 and a projection assembly 20. The laminated glass 10 has at least one projection display area 11. Each projection display area 11 has a wedge-shaped cross-section where the thickness of the upper side 112 is greater than the thickness of the lower side 111 when the laminated glass 10 is installed in a vehicle, and has a segment 113 where the wedge angle continuously decreases from the lower side 111 to the upper side 112. At any point in the segment 113, there are multiple theoretical wedge angle values ​​for measuring the wedge angle and eliminating reflection ghosting. The measured wedge angles at each point in the segment 113 are fitted to obtain the actual wedge angle fitting curve L0. Multiple limiting points are calculated based on multiple theoretical wedge angle values ​​at various locations within the segment 113 and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge 12 of the laminated glass 10. These multiple limiting points are sequentially connected to form a preset area. The actual wedge angle fitting curve L0 is a continuous curve contained within the preset area S0. The projection assembly 20 includes at least one projection light source 21 capable of projecting onto the at least one projection display area 11. The projection light emitted by the projection light source 21 is incident on the projection display area 11 to form a projected image 211.

[0127] In the embodiment, each of the projection display areas 11 has a section 113 with a wedge angle continuously and non-linearly monotonically decreasing from the lower side 111 to the upper side 112. It can be understood that, in the projection display area 11, the wedge angle of other sections 113 can be equal to 0, can be a constant wedge angle, can be linearly / non-linearly increasing, or linearly / non-linearly decreasing, or can be continuously decreasing together with the wedge angle of the section 113, in addition to the section 113.

[0128] In the 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 at least one projection display area 11 comprises at least one of one or more types of HUD images, one or more types of angle HUD images, and one or more types of display distance HUD images, so that the head-up display system 1 has multi-information display, and the richness of image display of the head-up display system 1 is increased. The at least one projection display area 11 is used for displaying HUD images, and in particular, the plurality of projection display areas 11 can be used to set up an augmented reality head-up display (AR-HUD) or a windshield head-up display (W-HUD), etc.

[0129] In the embodiment, the projection assembly 20 comprises at least one projection light source 21 projecting to the at least one projection display area 11. One of the projection light sources 21 corresponds to one of the projection display areas 11, or one of the projection light sources 21 corresponds to a plurality of the projection display areas 11. In an embodiment, the projection light emitted by the projection light source 21 is directly incident to the projection display area 11. In another embodiment, the projection light emitted by the projection assembly 20 is incident to the projection display area 11 through a reflection device.

[0130] In the embodiment, the wedge angle of the laminated glass 10 at the at least one projection display area 11 is used to eliminate the reflection ghost of the light emitted by the projection assembly 20 when the light forms the projection image 211 on the at least one projection display area 11. Specifically, the laminated glass 10 is exemplarily applied to a vehicle. When the projection assembly 20 projects the projection light forming the projection image 211 to the projection display area 11, due to the thickness of the laminated glass 10, the projection light reflected on the glass side of the laminated glass 10 located inside the vehicle to the eyebox EB located in the driver's cabin has reflection ghost (also called secondary image) with the projection light reflected on the glass side of the laminated glass 10 located outside the vehicle to the eyebox EB. When there is a high-reflective medium layer in the laminated glass 10, such as a metal coating layer containing Ag, a modified PET with high reflectivity, etc., reflection will also occur and multiple reflection ghosts will be generated. Therefore, the laminated glass 10 needs to be set with a certain wedge angle value at the projection display area 11 to superimpose the projection light reflected on the glass side of the laminated glass 10 located inside the vehicle to the eyebox EB located in the driver's cabin with the projection light reflected on the glass side of the laminated glass 10 located outside the vehicle or on the high-reflective medium layer to the eyebox EB, thereby eliminating the reflection ghost, so that the observer can see the projection image 211 without reflection ghost through the projection display area 11. Wherein, the eyebox EB refers to the eyes of the driver located in the driver's cabin.

[0131] Since the light reflected into the eyebox EB by the projection image 211 on different areas of the projection display area 11 has different angles, the laminated glass 10 needs to be set with different wedge angle values on different areas of the projection display area 11 to meet the requirement of observing the projection display area 11 on different areas with smaller ghost or even no ghost from the same position of the eyebox EB.

[0132] When the vehicle is running on a road with varying slope or unevenness, the vehicle will vibrate to some extent, and the eyebox EB will change its height relative to the ground during the vehicle running, which will cause the intersection of the projection light of the projection image 211 entering the eyebox EB and the projection display area 11 to change dynamically, and thus generate overall dynamic ghosting. In addition, during the actual manufacturing process of the laminated glass 10, the wedge angle curve of the intermediate wedge-shaped PVB film is not ideal and smooth, and the local fluctuation will also cause the ghosting distribution of the projection image 211 to be uneven, and thus the observation of the projection image 211 through the projection display area 11 at the eyebox EB will have ghosting or aggravated ghosting, i.e. local dynamic ghosting. Therefore, different wedge angle values need to be set for different areas of the projection display area 11 of the laminated glass 10 to meet the requirement of the eyebox EB for dynamic observation of the projection image 211 with less or even no reflection ghosting at different positions.

[0133] In the related art, the wedge angle change of the laminated glass 10 in the projection display area is only a linear segment splicing design of several wedge angle values, or a simple arc transition at the bending position of the spliced linear segment, which cannot meet the ghosting problem of the head-up display image in multiple areas of the projection display area 11, nor can it meet the dynamic ghosting problem in the same area of the projection display area 11.

[0134] In the present embodiment (please refer to Figure 3 ), each projection display area 11 has a wedge-shaped cross-sectional shape with the thickness of the upper side 112 being greater than that of the lower side 111 and the wedge angle continuously decreasing from the lower side 111 to the upper side 112 when the laminated glass 10 is installed on a vehicle. Figure 3 L0 is the actual fitting curve of the wedge angle of the laminated glass 10 in one projection display area 11 with the distance to the bottom edge 12 of the laminated glass 10. The wedge angle of the laminated glass 10 corresponding to each projection display area 11 continuously decreases in the direction from the lower side 111 to the upper side 112, so as to weaken or eliminate the ghosting problem of the head-up display image in each projection display area 11.

[0135] Specifically, the actual wedge angle fitting curve L0 has a continuous curve accommodated in the preset region S0. The preset region S0 is an intersection of a scatter point distribution region of multiple theoretical wedge angle values in which the center point of the projection image 211 is free of ghosting when the eyebox EB is observed at different heights and a scatter point distribution region of multiple theoretical wedge angle values in which the whole projection image is free of ghosting when the eyebox EB is observed at a specific height position. Therefore, the actual wedge angle value corresponding to the continuous curve in which the actual wedge angle fitting curve L0 is accommodated in the preset region S0 deviates less from the theoretical wedge angle value in which the center point of the projection image 211 is free of ghosting when the eyebox EB is observed at different heights and the theoretical wedge angle value in which the whole projection image 211 is free of ghosting when the eyebox EB is observed at a specific height position, that is, the center of the projection image 211 is less ghosted or even free of ghosting when the eyebox EB is observed at different heights, and the whole projection image 211 is less ghosted or even free of ghosting when the eyebox EB is observed at a specific height position. Generally, the image information at the center point of the projection image 211 is information of a higher importance level, and therefore, by weakening or even eliminating the reflection ghosting of the center point of the projection image 211 in the dynamic observation process, the local dynamic ghosting at the center point of the projection image 211 can be effectively weakened or even eliminated, and the influence of the whole dynamic ghosting of the projection image 211 on information transmission is reduced.

[0136] Compared with the related art, the application provides a head-up display system 1, which comprises a laminated glass 10 and a projection assembly 20. The laminated glass 10 has a wedge-shaped cross-sectional shape with a thickness of an upper side 112 greater than that of a lower side 111 in a projection display area 11, and has a section 113 in which a wedge angle continuously and nonlinearly monotonically decreases from the lower side 111 to the upper side 112. An actual wedge angle fitting curve L0 is fitted from the measured wedge angle at each point position of the section 113, and the actual wedge angle fitting curve L0 has a continuous curve accommodated in a preset region S0. The continuous curve and the center of the projection image 211 tend to be consistent with a line of multiple theoretical wedge angle values in which reflection ghosting is eliminated in the projection display area 11 in a dynamic change process, which can weaken or even eliminate ghosting of a head-up display image obtained through the projection display area 11, thereby improving the quality of the head-up display image projected onto the laminated glass 10, and being beneficial to dynamic observation of the head-up display image by a driver when the vehicle is running, thereby improving driving safety and comfort. The head-up display system 1 provided by the application can weaken or even eliminate ghosting of the head-up display image in multi-point dynamic observation.

[0137] Please refer to Figure 1 and Figure 3In the embodiment, the first variation curve L10 is obtained by fitting the plurality of theoretical wedge angle values at the positions of the points in the section 113. The maximum deviation value Δαmax between the actual wedge angle fitting curve L0 and the first variation curve L10 is less than or equal to 0.15 mrad.

[0138] In the embodiment, the first variation curve L10 is obtained by fitting the plurality of theoretical wedge angle values at the positions of the points in the section 113. The maximum deviation value Δαmax between the actual wedge angle fitting curve L0 and the first variation curve L10 is less than or equal to 0.15 mrad.

[0139] Please refer to Figure 1 and Figure 3 In the embodiment, the wedge angle in the section 113 continuously and nonlinearly decreases from the lower side 111 to the upper side 112, and the actual wedge angle fitting curve L0 and the first variation curve L10 both conform to a 1-4 order function.

[0140] In the embodiment, the actual wedge angle fitting curve L0 and the first variation curve L10 both conform to a 1-4 order function, which ensures that the actual wedge angle fitting curve L0 is smooth everywhere, thereby preventing the local wedge angle value from suddenly changing and aggravating the reflection ghosting.

[0141] Please refer to Figure 4 and Figure 5 , Figure 4 for Figure 1 a schematic diagram of the head-up display system provided by the embodiment for dynamically observing the projection image; Figure 5 for Figure 4In an embodiment of the head-up display system provided by the embodiments, a fitting curve of an actual wedge angle of a projection display area and a schematic diagram of a preset area are provided. In the embodiment, the head-up display system 1 includes a first eye box EB_S, a second eye box EB_M and a third eye box EB_T from low to high, and the projection image 211 includes a first sub-projection image 2111, a second sub-projection image 2112 and a third sub-projection image 2113 from high to low. The preset area S0 is a polygon, and the plurality of limiting points include a first limiting point P1, a second limiting point P2, a third limiting point P3 and a fourth limiting point P4. A first connecting line is obtained by connecting a bottom point of a median line of the first eye box EB_S and a center point of the first sub-projection image 2111. The coordinate information of the first limiting point P1 includes a distance from an intersection point of the first connecting line and the projection display area 11 to a bottom edge 12 of the laminated glass 10, and a theoretical wedge angle value without reflection ghosting observed from the center point of the first sub-projection image 2111 at the bottom point of the median line of the first eye box EB_S. A second connecting line is obtained by connecting a top point of a median line of the second eye box EB_M and a top-left corner point of the second sub-projection image 2112. The coordinate information of the second limiting point P2 includes a distance from an intersection point of the second connecting line and the projection display area 11 to the bottom edge 12 of the laminated glass 10, and a theoretical wedge angle value without reflection ghosting observed from the top-left corner point of the second sub-projection image 2112 at the top point of the median line of the second eye box EB_M. A third connecting line is obtained by connecting a top point of a median line of the third eye box EB_T and a center point of the third sub-projection image 2113. The coordinate information of the third limiting point P3 includes a distance from an intersection point of the third connecting line and the projection display area 11 to the bottom edge 12 of the laminated glass 10, and a theoretical wedge angle value without reflection ghosting observed from the center point of the third sub-projection image 2113 at the top point of the median line of the third eye box EB_T. A fourth connecting line is obtained by connecting a bottom point of a median line of the second eye box EB_M and a bottom-right corner point of the second sub-projection image 2112. The coordinate information of the fourth limiting point P4 includes a distance from an intersection point of the fourth connecting line and the projection display area 11 to the bottom edge 12 of the laminated glass 10, and a theoretical wedge angle value without reflection ghosting observed from the bottom-right corner point of the second sub-projection image 2112 at the bottom point of the median line of the second eye box EB_M.

[0142] In the embodiment, the first eyebox EB_S, the second eyebox EB_M and the third eyebox EB_T represent positions of the driver's eyes at different heights from the ground in the cab of the vehicle. Among them, the second eyebox EB_M represents the position of the driver's eyes at the normal height when the vehicle is not jolted. Correspondingly, the eyebox EB observes the projection image 211 at different heights through the projection display area 11, and the projection image 211 appears at different heights on the side of the laminated glass 10 away from the eyebox EB. Specifically, the first eyebox EB_S corresponds to observe the first sub-projection image 2111, the second eyebox EB_M corresponds to observe the second sub-projection image 2112, and the third eyebox EB_T corresponds to observe the third sub-projection image 2113.

[0143] In the embodiment, the preset area S0 is a quadrilateral, and the preset area S0 is formed by sequentially connecting the first limit point P1, the second limit point P2, the third limit point P3 and the fourth limit point P4. Specifically, the preset area S0 is in the same coordinate system as the actual wedge angle fitting curve L0, the horizontal coordinate is the distance from the bottom edge 12 of the laminated glass 10, and the vertical coordinate is the wedge angle value.

[0144] Among them, the horizontal coordinate of the first limit point P1 is the distance from the intersection of the first connecting line and the projection display area 11 to the bottom edge 12 of the laminated glass 10, and the vertical coordinate is the theoretical wedge angle value without reflection ghosting when observing the center point of the first sub-projection image 2111 at the bottom point of the median line of the first eyebox EB_S.

[0145] According to the characteristics of projection imaging, on the first eyebox EB_S, as the observation point of the center point of the first sub-projection image 2111 moves from the bottom point to the top point of the median line of the first eyebox EB_S, the distance between the connecting line of the observation point and the center point of the first sub-projection image 2111 and the intersection of the projection display area 11 and the bottom edge 12 of the laminated glass 10 becomes larger, and the theoretical wedge angle value required to eliminate reflection ghosting becomes smaller. Therefore, in the coordinate system of the actual wedge angle fitting curve L0, the theoretical wedge angle value without reflection ghosting when observing the center point of the first sub-projection image 2111 on the median line of the first eyebox EB_S is distributed on the lower right side of the first limit point P1.

[0146] Among them, the horizontal coordinate of the second limit point P2 is the distance from the intersection of the second connecting line and the projection display area 11 to the bottom edge 12 of the laminated glass 10, and the vertical coordinate is the theoretical wedge angle value without reflection ghosting when observing the top left corner point of the second sub-projection image 2112 at the top point of the median line of the second eyebox EB_M.

[0147] According to the characteristics of projection imaging, on the second eyebox EB_M, as the observation point of the upper left corner of the second sub-projection image 2112 moves from the top point of the median line of the second eyebox EB_M to the bottom point, the distance between the line connecting the observation point and the upper left corner of the second sub-projection image 2112 and the intersection point of the projection display area 11 and the bottom edge 12 of the laminated glass 10 becomes smaller, and the theoretical wedge angle value required to eliminate the reflection ghosting becomes larger. Therefore, in the coordinate system of the actual wedge angle fitting curve L0, the scattered point distribution of the theoretical wedge angle value without reflection ghosting when observing the upper left corner of the second sub-projection image 2112 on the median line of the second eyebox EB_M is located in the upper left of the second limiting point P2. Among them, the scattered point distribution of the theoretical wedge angle value without reflection ghosting when observing the center of the second sub-projection image 2112 on the median line of the second eyebox EB_M is also located in the upper left of the second limiting point P2.

[0148] Wherein, the horizontal coordinate of the third limiting point P3 is the distance from the intersection point of the third connecting line and the projection display area 11 to the bottom edge 12 of the laminated glass 10, and the vertical coordinate is the theoretical wedge angle value without reflection ghosting when observing the center of the third sub-projection image 2113 at the top point of the median line of the third eyebox EB_T.

[0149] According to the characteristics of projection imaging, on the third eyebox EB_T, as the observation point of the center of the third sub-projection image 2113 moves from the top point of the median line of the third eyebox EB_T to the bottom point, the distance between the line connecting the observation point and the center of the third sub-projection image 2113 and the intersection point of the projection display area 11 and the bottom edge 12 of the laminated glass 10 becomes smaller, and the theoretical wedge angle value required to eliminate the reflection ghosting becomes larger. Therefore, in the coordinate system of the actual wedge angle fitting curve L0, the scattered point distribution of the theoretical wedge angle value without reflection ghosting when observing the center of the third sub-projection image 2113 on the median line of the third eyebox EB_T is located in the upper left of the third limiting point P3.

[0150] Wherein, the horizontal coordinate of the third limiting point P3 is the distance from the intersection point of the third connecting line and the projection display area 11 to the bottom edge 12 of the laminated glass 10, and the vertical coordinate is the theoretical wedge angle value without reflection ghosting when observing the center of the third sub-projection image 2113 at the top point of the median line of the third eyebox EB_T.

[0151] According to the characteristics of the projection imaging, on the second eyebox EB_M, as the observation point of the lower right corner point of the second sub-projection image 2112 moves from the bottom point of the median line of the second eyebox EB_M to the top point, the distance between the line connecting the observation point and the lower right corner point of the second sub-projection image 2112 and the intersection point of the projection display area 11 and the bottom edge 12 of the laminated glass 10 becomes larger, and the required theoretical wedge angle value for eliminating the reflection ghosting becomes smaller. Therefore, in the coordinate system of the actual wedge angle fitting curve L0, the scattered point distribution of the theoretical wedge angle value for observing the lower right corner point of the second sub-projection image 2112 on the median line of the second eyebox EB_M without reflection ghosting is located in the lower right of the fourth limiting point P4. Among them, the scattered point distribution of the theoretical wedge angle value for observing the center of the second sub-projection image 2112 on the median line of the second eyebox EB_M without reflection ghosting is also located in the lower right of the fourth limiting point P4.

[0152] Therefore, the preset area S0 surrounded by the first limiting point P1, the second limiting point P2, the third limiting point P3 and the fourth limiting point P4 contains multiple theoretical wedge angle value distributions for observing the center point of the projection image 211 from different points on the median line of the first eyebox EB_S, different points on the median line of the second eyebox EB_M and different points on the median line of the third eyebox EB_T without reflection ghosting. Therefore, the continuous curve of the actual wedge angle fitting curve L0 contained in the preset area S0 has a smaller deviation from the theoretical wedge angle value for eliminating the reflection ghosting of the center point of the projection image 211 observed on the median line of the eyebox EB, that is, the wedge angle setting in the projection display area 11 can weaken or even eliminate the reflection ghosting of the center point of the projection image 211 observed dynamically.

[0153] Please refer to Figure 4 and Figure 6 , Figure 6 as Figure 4In another embodiment of the head-up display system, a fitting curve of the actual wedge angle of the projection display area is provided in a schematic view of the preset area. In the embodiment, the plurality of limit points further include a fifth limit point P5 and a sixth limit point P6, and the preset area S0 is formed by connecting the first limit point P1, the fifth limit point P5, the second limit point P2, the third limit point P3, the sixth limit point P6, and the fourth limit point P4 in sequence. A fifth connecting line is obtained by connecting the top point of the median line of the first eye box EB_S and the center point of the first sub-projection image 2111. The coordinate information of the fifth limit point P5 includes the distance from the intersection point of the fifth connecting line and the projection display area 11 to the bottom edge 12 of the laminated glass 10, and the theoretical wedge angle value without reflection ghost observed from the center point of the first sub-projection image 2111 at the top point of the median line of the first eye box EB_S. A sixth connecting line is obtained by connecting the bottom point of the median line of the third eye box EB_T and the center point of the third sub-projection image 2113. The coordinate information of the sixth limit point P6 includes the distance from the intersection point of the sixth connecting line and the projection display area 11 to the bottom edge 12 of the laminated glass 10, and the theoretical wedge angle value without reflection ghost observed from the center point of the third sub-projection image 2113 at the bottom point of the median line of the third eye box EB_T.

[0154] In the embodiment, the preset area S0 is a hexagon, and the preset area S0 is formed by connecting the first limit point P1, the fifth limit point P5, the second limit point P2, the third limit point P3, the sixth limit point P6, and the fourth limit point P4 in sequence. Specifically, the preset area S0 and the fitting curve L0 of the actual wedge angle are in the same coordinate system, the horizontal coordinate is the distance from the bottom edge 12 of the laminated glass 10, and the vertical coordinate is the wedge angle value.

[0155] In the embodiment, the preset area S0 is a hexagon, and the preset area S0 is formed by connecting the first limit point P1, the fifth limit point P5, the second limit point P2, the third limit point P3, the sixth limit point P6, and the fourth limit point P4 in sequence. Specifically, the preset area S0 and the fitting curve L0 of the actual wedge angle are in the same coordinate system, the horizontal coordinate is the distance from the bottom edge 12 of the laminated glass 10, and the vertical coordinate is the wedge angle value.

[0156] According to the characteristics of the projection imaging, on the first eyebox EB_S, as the observation point of the center point of the first sub-projection image 2111 moves from the top point of the median line of the first eyebox EB_S to the bottom point, the distance between the line connecting the observation point and the center point of the first sub-projection image 2111 and the intersection point of the projection display area 11 and the bottom edge 12 of the laminated glass 10 becomes smaller, and the theoretical wedge angle value required to eliminate the reflection ghosting becomes larger. Therefore, in the coordinate system of the actual wedge angle fitting curve L0, the scatter point distribution of the theoretical wedge angle value without reflection ghosting when observing the center point of the first sub-projection image 2111 on the median line of the first eyebox EB_S is located in the upper left of the fifth limit point P5.

[0157] The horizontal coordinate of the sixth limit point P6 is the distance from the intersection point of the sixth connecting line and the projection display area 11 to the bottom edge 12 of the laminated glass 10, and the vertical coordinate is the theoretical wedge angle value without reflection ghosting when observing the center point of the third sub-projection image 2113 from the bottom point of the median line of the third eyebox EB_T.

[0158] According to the characteristics of the projection imaging, on the third eyebox EB_T, as the observation point of the center point of the third sub-projection image 2113 moves from the bottom point of the median line of the third eyebox EB_T to the top point, the distance between the line connecting the observation point and the center point of the third sub-projection image 2113 and the intersection point of the projection display area 11 and the bottom edge 12 of the laminated glass 10 becomes larger, and the theoretical wedge angle value required to eliminate the reflection ghosting becomes smaller. Therefore, in the coordinate system of the actual wedge angle fitting curve L0, the scatter point distribution of the theoretical wedge angle value without reflection ghosting when observing the center point of the third sub-projection image 2113 on the median line of the third eyebox EB_T is located in the lower right of the sixth limit point P6.

[0159] Therefore, the more accurate distribution of the theoretical wedge angle values without reflection ghosting when observing different regions of the projection image 211 from different points on the median line of the first eyebox EB_S, the median line of the second eyebox EB_M and the median line of the third eyebox EB_T is obtained by connecting the first limit point P1, the fifth limit point P5, the second limit point P2, the third limit point P3, the sixth limit point P6 and the fourth limit point P4 in sequence. Therefore, the continuous curve of the actual wedge angle fitting curve L0 contained in the preset area S0 further reduces the deviation of the theoretical wedge angle value required to eliminate the reflection ghosting when observing different regions of the projection image 211 on the median line of the eyebox, that is, the wedge angle setting in the projection display area 11 can further weaken or even eliminate the ghosting when dynamically observing different regions of the projection image 211.

[0160] Referring to Figure 4 and Figure 7 , Figure 7 As Figure 4 In another embodiment of the head-up display system provided by the embodiments, a schematic diagram of a projection display area and an actual wedge angle fitting curve is shown. In this embodiment, the first limit point P1 and the fourth limit point P4 form a first limit line segment P1-P4, the second limit point P2 and the third limit point P3 form a second limit line segment P2-P3, and the actual wedge angle fitting curve L0 intersects the first limit line segment P1-P4 and / or the second limit line segment P2-P3.

[0161] In this embodiment, the actual wedge angle fitting curve L0 intersects the first limit line segment P1-P4, so that the actual wedge angle fitting curve L0, while having a continuous curve that is accommodated in the preset area S0, reduces the deviation value of the theoretical wedge angle value when the first sub-projection image 2111 has no reflection ghosting near the bottom area as observed from the partial point on the median line of the first eye box EB_S, and reduces the deviation value of the theoretical wedge angle value when the second sub-projection image 2112 has no reflection ghosting near the bottom area as observed from the partial point on the median line of the second eye box EB_M.

[0162] In this embodiment, the actual wedge angle fitting curve L0 intersects the second limit line segment P2-P3, so that the actual wedge angle fitting curve L0, while having a continuous curve that is accommodated in the preset area S0, reduces the deviation value of the theoretical wedge angle value when the second sub-projection image 2112 has no reflection ghosting near the top area as observed from the partial point on the median line of the second eye box EB_M, and reduces the deviation value of the theoretical wedge angle value when the third sub-projection image 2113 has no reflection ghosting near the top area as observed from the partial point on the median line of the third eye box EB_T.

[0163] Further, in the embodiment, when the person's eye moves along the bottom point to the top point of the median line of the first eye box EB_S, the distribution of the theoretical parallax-free wedge angle values obtained by observing the center point of the first sub-projected image 2111 is near the line connecting the first limit point P1 and the fifth limit point P5, and preferably the actual wedge angle fitting curve L0 extends along the line connecting the first limit point P1 and the fifth limit point P5, so that the reflection ghost observed dynamically in the central region of the first sub-projected image 2111 can be further weakened or even eliminated.

[0164] Further, in the embodiment, when the person's eye moves along the bottom point to the top point of the median line of the third eye box EB_T, the distribution of the theoretical parallax-free wedge angle values obtained by observing the center point of the third sub-projected image 2113 is near the line connecting the third limit point P3 and the sixth limit point P6, and preferably the actual wedge angle fitting curve L0 extends along the line connecting the third limit point P3 and the sixth limit point P6, so that the reflection ghost observed dynamically in the central region of the third sub-projected image 2113 can be further weakened or even eliminated.

[0165] Please refer to Figure 4 and Figure 8 , Figure 8 for Figure 4 another embodiment of the head-up display system provided by the embodiment, a schematic diagram of the actual wedge angle fitting curve of the projection display area and the preset area. In the embodiment, the actual wedge angle fitting curve L0 passes through the seventh limit point G. The seventh limit point G is the barycenter of the distribution of the plurality of theoretical parallax-free wedge angle values obtained by observing the second sub-projected image 2112 corresponding to each point of the median line of the second eye box EB_M in the coordinate system where the actual wedge angle fitting curve L0 is located.

[0166] In the embodiment, the actual wedge angle fitting curve L0 passes through the seventh limit point G. The seventh limit point G is the barycenter of the distribution of the plurality of theoretical parallax-free wedge angle values obtained by observing the second sub-projected image 2112 corresponding to each point of the median line of the second eye box EB_M in the coordinate system where the actual wedge angle fitting curve L0 is located, that is, the ghost of the second sub-projected image 2112 observed on the median line of the second eye box EB_M is smaller. Since the second eye box EB_M is the normal height of the driver's eyes in the driver's cabin, the ghost of the driver when dynamically observing the projected image 211 is smaller when the vehicle is less bumpy or not bumpy.

[0167] Please refer to Figure 4 and Figure 9 , Figure 9 for Figure 4In another embodiment of the head-up display system provided by the embodiments, the actual wedge angle fitting curve of the projection display area is fitted with a schematic diagram of the preset area. In the embodiment, the actual wedge angle fitting curve L0 passes through the eighth limit point P8, a line connecting the midpoint of the median line of the second eye box EB_M and the center point of the second sub-projection image 2112 is obtained, and the coordinate information of the eighth limit point P8 includes the distance from the intersection point of the eighth line and the bottom edge 12 of the laminated glass 10 to the bottom edge 12 of the laminated glass 10, and a theoretical wedge angle value without reflection ghosting is obtained when the center point of the second sub-projection image 2112 is observed from the midpoint of the median line of the second eye box EB_M.

[0168] In the embodiment, in the vehicle, the eye position of the driver is generally at the midpoint of the median line of the second eye box EB_M. At the same time, the information with a high level of importance of the displayed information in the projection image 211 is generally displayed at the center of the projection image 211. Therefore, it is more important to observe the center point of the second sub-projection image 2112 without reflection ghosting when the eye of the driver is at the midpoint of the median line of the second eye box EB_M. Therefore, the actual wedge angle fitting curve L0 passes through the eighth limit point P8, which is beneficial to the driver to observe the projection image 211 when the eye is at the normal position.

[0169] In order to greatly slow down the dynamic ghosting, the actual wedge angle fitting curve L0 is preferably extended close to both the line connecting the first limit point P1 and the fifth limit point P5 and the line connecting the sixth limit point P6 and the third limit point P3, and passes through the seventh limit point G or the eighth limit point P8, so that the actual wedge angle fitting curve L0 can also avoid local sharp changes, and it is difficult for multiple sub-eye box surfaces EB11 to observe dynamic ghosting.

[0170] Please refer to Figure 1 In the embodiment, in the direction in which the bottom edge 12 of the laminated glass 10 points to the top edge 13, the ratio of the length of the section 113 to the length of the projection display area 11 is not less than 70%.

[0171] In the embodiment, in the direction in which the bottom edge 12 of the laminated glass 10 points to the top edge 13, the ratio of the length d1 of the section 113 to the length d2 of the projection display area 11 is not less than 70%, preferably, the ratio of the length of the section 113 to the length of the projection display area 11 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%. The length is measured in the direction from the lower side 111 to the upper side 112.

[0172] Please refer to Figure 10 andFigure 11 , Figure 10 Structure diagram of the head-up display system according to another embodiment of the present application; Figure 11 For Figure 10 The schematic diagram of the projection imaging in the head-up display system according to the embodiment. In the embodiment, the at least one projection display area 11 includes at least one first projection display area 114 and at least one second projection display area 115. The projection light source 21 is incident to the first projection display area 114 to form a first projection image 2121, and the virtual image distance of the first projection image 2121 is 7-100 meters. The projection light source 21 is incident to the second projection display area 115 to form a second projection image 2131, and the virtual image distance of the second projection image 2131 is 1-6 meters.

[0173] In the embodiment, the first projection display area 114 is used for long-distance projection display, and specifically, the first projection display area 114 is used for displaying information fused with a real scene and for projecting a complex pattern corresponding to an object in a real world to realize interaction among road conditions, vehicles and drivers. The second projection display area 115 is used for short-distance projection display, and specifically, the second projection display area 115 is used for displaying vehicle operation parameter information at a short distance, which can reduce looking down at an instrument panel or related information, facilitate switching of a driver's eyes between long and short distances, reduce looking down at the instrument panel, maximize concentration of the driver's attention during driving, and improve driving safety.

[0174] Please refer to Figure 12 , Figure 12 Structure diagram of the head-up display system according to another embodiment of the present application. In the embodiment, the projection assembly 20 includes at least one first projection light source 212 and at least one second projection light source 213. The first projection light source 212 is incident to the first projection display area 114, and the second projection light source 213 is incident to the second projection display area 115.

[0175] In the embodiment, the first projection light source 212 is used for long-distance projection display by being projected to the first projection display area 114, and specifically, the first projection display area 114 is used for displaying information fused with a real scene and for projecting a complex pattern corresponding to an object in a real world to realize interaction among road conditions, vehicles and drivers. The second projection light source 213 is used for short-distance projection display by being projected to the second projection display area 115, and specifically, the second projection display area 115 is used for displaying vehicle operation parameter information at a short distance, which can reduce looking down at an instrument panel or related information, facilitate switching of a driver's eyes between long and short distances, reduce looking down at the instrument panel, maximize concentration of the driver's attention during driving, and improve driving safety.

[0176] In the functional area where signals from sensors such as cameras and lidar are transmitted, a wedge-shaped intermediate adhesive layer can also be used to optimize the transmission ghosting problem of the corresponding sensors. The wedge-shaped intermediate adhesive layer in the functional area has a fixed wedge angle or a wedge angle with a fixed slope. This wedge angle is a fixed value or uses a curve of change of a first-order simple function, which makes it easy to control the production of the wedge angle.

[0177] This application also provides a design method for a head-up display system 1. Please refer to... Figure 13 , Figure 14 and Figure 15 , Figure 13 A flowchart illustrating a design method for a head-up display system provided in one embodiment of this application; Figure 14 for Figure 13 A schematic diagram of the design method for the head-up display system provided in the implementation method; Figure 15 for Figure 13The embodiment provides a schematic diagram of a first variation curve in a design method of a head-up display system. In the embodiment, the design method of the head-up display system 1 comprises providing a projection assembly 20 and a laminated glass 10, the projection light emitted by the projection assembly 20 is incident on at least one projection display area 11 on the laminated glass 10. An eyebox surface EB10 in the vehicle is designed according to an observer in the vehicle. A virtual image surface TB10 observed by the observer through each projection display area 11 is designed. The eyebox surface EB10 comprises a plurality of sub-eyebox surfaces EB11 in sequence from low to high, and the virtual image surface TB10 corresponds to a plurality of sub-virtual image surfaces TB11 in sequence from high to low, wherein each sub-virtual image surface TB11 corresponds to a sub-eyebox surface EB11. An observation point array EB111 is selected on each sub-eyebox surface EB11, and a virtual image point array TB111 is selected on each sub-virtual image surface TB11, the line connecting a point in the observation point array EB111 and a point in the virtual image point array TB111 passes through the corresponding projection display area 11, and the intersection of the line and the projection display area 11 is an incident point. A plurality of theoretical wedge angle values of the laminated glass 10 at which the projection image 211 has no reflection ghosting is calculated according to the projection assembly 20, the laminated glass 10, and the plurality of lines. A first variation curve L10 of the wedge angle with the distance of the incident point to the bottom edge 12 of the laminated glass 10 is fitted according to the plurality of theoretical wedge angle values and the distance of the incident point corresponding to each theoretical wedge angle value to the bottom edge 12 of the laminated glass 10. A plurality of limit points is calculated according to the plurality of theoretical wedge angle values and the distance of the incident point corresponding to each theoretical wedge angle value to the bottom edge 12 of the laminated glass 10, and the plurality of limit points are sequentially connected to form a preset region S0. The first variation curve L10 is adjusted so that the adjusted first variation curve L11 has a continuous curve accommodated in the preset region S0. The wedge angle value of the laminated glass 10 corresponding to the projection display area 11 is determined according to the adjusted first variation curve L11.

[0178] In the embodiment, the laminated glass 10 is used for the front windshield of a vehicle and is applied to the head-up display system 1 of the vehicle. The design method of the laminated glass 10 comprises S10, S20, S30, S40, S50, S60, S70, S80, and S90. S10, S20, S30, S40, S50, S60, S70, S80, and S90 will be described in detail below.

[0179] S10, providing a projection assembly 20 and a laminated glass 10, the projection light emitted by the projection assembly 20 is incident on at least one projection display area 11 on the laminated glass 10.

[0180] S20, designing an eyebox surface EB10 in the vehicle according to an observer in the vehicle.

[0181] S30 The virtual image surface TB10 is designed according to the projected image 211 observed by the observer in the vehicle through each projection display area 11.

[0182] In the embodiment, the eyebox surface EB10 includes a plurality of sub-eyebox surfaces EB11 in order from low to high, and the virtual image surface TB10 includes a plurality of sub-virtual image surfaces TB11 in order from high to low. Each sub-virtual image surface TB11 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 virtual image surface TB10 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 sub-virtual image surfaces TB11 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 sub-virtual image surfaces TB11 are in a central symmetric relationship in terms of height, i.e., the highest sub-eyebox surface EB11 corresponds to the lowest sub-virtual image surface TB11, and the lowest sub-eyebox surface EB11 corresponds to the highest sub-virtual image surface TB11.

[0183] S40, selecting an observation point array EB111 on each sub-eyebox surface EB11 and a virtual image point array TB111 on each sub-virtual image surface TB11, the line connecting a point in the observation point array EB111 and a point in the virtual image point array TB111 passes through the corresponding projection display area 11, and the intersection of the line and the projection display area 11 is the incident point.

[0184] In the embodiment, each point in the observation point array EB111 corresponds to the position of the observer's eyes. Each point in the virtual image point array TB111 corresponds to the virtual image formed on the virtual image surface TB10 by the reflection of the projection light on the eyebox surface EB10 at a certain point. Specifically, each point in the virtual image point array TB111 corresponds to one or more points in the observation point array EB111, i.e., the observer at different positions on the eyebox surface EB10 can see the virtual image at the same position on the virtual image surface TB10. In addition, the observer at the same position on the eyebox surface EB10 can see the virtual image at different positions on the virtual image surface TB10.

[0185] S50, calculating a plurality of theoretical wedge angle values of the laminated glass 10 at the corresponding incident point positions according to the projection assembly 20, the laminated glass 10 and the plurality of connecting lines.

[0186] In the present embodiment, in each of the corresponding arranged sub-eye box face EB11 and the sub-virtual image face TB11, each point in the observation point array EB111 and each point in the virtual image point array TB111 are connected with an intersection point, i.e. an incident point, with the laminated glass 10. The theoretical wedge angle value at the incident point is calculated by calculating the incident point at which the observer sees the virtual image on the sub-virtual image face TB11 without reflection ghosting. The number of the incident points used for simulation calculation is the number of the theoretical wedge angle values.

[0187] S60, fitting to obtain a first variation curve L10 of the wedge angle with the distance of the incident point to the bottom edge 12 of the laminated glass 10 according to the plurality of theoretical wedge angle values and the distance of the incident point corresponding to each of the theoretical wedge angle values to the bottom edge 12 of the laminated glass 10.

[0188] In the embodiment, the plurality of theoretical wedge angle values present a discrete distribution with the distance from the incident point to the bottom edge 12 of the laminated glass 10. Specifically, in an embodiment, a sub-discrete diagram of the plurality of theoretical wedge angle values can be calculated for each corresponding sub-eyebox face EB11 and sub-virtual image face TB11, and a plurality of sub-discrete diagrams are combined in the same coordinate system to form a discrete diagram. The first variation curve is fitted by function fitting on the discrete diagram of the plurality of 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 a composite function composed of the basic functions. The data curve fitting process can be completed in Microsoft Excel, WPS, MATLAB, OriginPro or the like. Since the observer can see multiple images of different distances or angles at a certain point on the laminated glass 10, the theoretical wedge angle value at the 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 theoretical wedge angle value of other points at the same distance from the glass bottom edge 12 to the top edge 13 in the direction has multiple values, and the wedge angle value at a certain distance from the bottom edge 12 of the laminated glass 10 is suitable to have one value. Therefore, the wedge angle value at each incident point on the laminated glass 10 needs to be properly selected to weaken the ghosting phenomenon. By function fitting on the plurality of theoretical wedge angle values, the deviation of the wedge angle value of the laminated glass 10 on the projection display area 11 from the plurality of theoretical wedge angle values can be smaller, thereby reducing the imaging ghosting phenomenon of the projection display area 11 projected onto the laminated glass 10, and improving the imaging quality of the laminated glass 10. In another embodiment, for each of the plurality of theoretical wedge angle values at each incident point, the average of the maximum and minimum of the plurality of theoretical wedge angle values at the point is selected, and then the average of the maximum and minimum of the plurality of theoretical wedge angle values at each incident point is connected to form the first variation curve L10.

[0189] S70, a plurality of limit points are calculated according to the plurality of theoretical wedge angle values and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge 12 of the laminated glass 10, and the plurality of limit points are sequentially connected to form a preset area S0.

[0190] In the embodiment, the preset area S0 is a scatter distribution area that accommodates the theoretical wedge angle values when the center point of the virtual image face TB10 is observed from the eyebox face EB10 at different heights without reflection ghosting.

[0191] S80, the first variation curve L10 is adjusted so that the adjusted first variation curve L11 has a continuous curve accommodated in the preset area S0.

[0192] In the embodiment, the first variation curve L10 can be adjusted in the form of adjusting the wedge angle value points or fitting function, etc., so that the adjusted first variation curve L11 has a continuous curve accommodated in the preset region S0. The actual wedge angle value corresponding to the continuous curve of the adjusted first variation curve L11 accommodated in the preset region S0 has a smaller deviation from the theoretical wedge angle value of the eyebox surface EB10 at different heights for observing the center reflection ghost of the projection image 211, that is, the eyebox surface EB10 has less or even no reflection ghost for observing the center of the projection image 211 at different heights.

[0193] S90, determining the wedge angle value of the laminated glass 10 corresponding to the projection display area 11 according to the adjusted first variation curve L11.

[0194] In the embodiment, the wedge angle value of the laminated glass 10 corresponding to the projection display area 11 is determined by the adjusted first variation curve L11 to weaken the imaging ghost phenomenon of the laminated glass 10 in the projection display area 11 observed by the eyebox surface EB10. Specifically, by selecting and designing the virtual image surface TB10, the distribution of the plurality of theoretical wedge angle values of the projection display area 11 in the laminated glass 10 can be calculated, and the adjusted first variation curve L11 corresponding to the projection display area 11 can be fitted to determine the wedge angle value of the laminated glass 10 corresponding to the projection display area 11.

[0195] In an embodiment, the first variation curve L10 is adjusted for optimization. The “adjusting the first variation curve L10 so that the adjusted first variation curve L11 has a continuous curve accommodated in the preset region S0” includes adjusting the first variation curve L10 so that the adjusted first variation curve L11 has a continuous curve accommodated in the preset region.

[0196] Specifically, in the embodiment, the first variation curve L10 is a curve fitted by a plurality of theoretical wedge angle values for observing the projection image 211 without reflection ghost at a specific position on the eyebox surface EB10. The adjusted first variation curve L11 has a continuous curve accommodated in the preset region S0, which not only ensures that the reflection ghost of the projection image 211 is smaller or even has no reflection ghost at a specific position on the eyebox surface EB10, but also ensures that the center reflection ghost of the projection image 211 is smaller or even has no reflection ghost when the eyebox surface EB10 is dynamically observed at different positions.

[0197] In the embodiment, the adjusted first change curve L11 conforms to a 1-4 order function and has a continuous curve with continuously nonlinear and decreasing, which ensures that the adjusted first change curve L11 is smooth everywhere, thereby preventing the local wedge angle value from suddenly changing and aggravating the reflection ghosting.

[0198] Please refer to Figure 16 , Figure 16 For Figure 14 The design method of the head-up display system provided by the embodiment provides a design schematic diagram of an eyebox surface and a virtual image surface; Figure 17 For Figure 16The embodiment provides a schematic diagram of the adjusted first variation curve in the design method of the head-up display system. In the embodiment, the eyebox surface EB10 includes a first sub-eyebox surface EB12, a second sub-eyebox surface EB13, and a third sub-eyebox surface EB14 in turn from low to high. The virtual image surface TB10 corresponds to include a first sub-virtual image surface TB12, a second sub-virtual image surface TB13, and a third sub-virtual image surface TB14 in turn from high to low. The preset region S0 is a polygon, and the plurality of limit points include a first limit point P1, a second limit point P2, a third limit point P3, and a fourth limit point P4. The “calculating a plurality of limit points according to the plurality of theoretical wedge angle values and the distance from the corresponding incident point to the bottom edge 12 of the laminated glass 10” includes connecting the bottom point of the median line of the first sub-eyebox surface EB12 and the center point of the first sub-virtual image surface TB12 to obtain a first connecting line, the first connecting line intersects the projection display area 11 at a first incident point, connecting the top point of the median line of the second sub-eyebox surface EB13 and the top-left corner point of the second sub-virtual image surface TB13 to obtain a second connecting line, the second connecting line intersects the projection display area 11 at a second incident point, connecting the top point of the median line of the third sub-eyebox surface EB14 and the center point of the third sub-virtual image surface TB14 to obtain a third connecting line, the third connecting line intersects the projection display area 11 at a third incident point, and connecting the bottom point of the median line of the second sub-eyebox surface EB13 and the bottom-right corner point of the second sub-virtual image surface TB13 to obtain a fourth connecting line, the fourth connecting line intersects the projection display area 11 at a fourth incident point. According to the projection assembly 20, the laminated glass 10, the first connecting line, the second connecting line, the third connecting line, and the fourth connecting line, a first limit theoretical wedge angle value without reflection ghost at the first incident point, a second limit theoretical wedge angle value without reflection ghost at the second incident point, a third limit theoretical wedge angle value without reflection ghost at the third incident point, and a fourth limit theoretical wedge angle value without reflection ghost at the fourth incident point are calculated. And according to the first limit theoretical wedge angle value and the distance from the first incident point to the bottom edge 12 of the laminated glass 10, the first limit point P1 is obtained, according to the second limit theoretical wedge angle value and the distance from the second incident point to the bottom edge 12 of the laminated glass 10, the second limit point P2 is obtained, according to the third limit theoretical wedge angle value and the distance from the third incident point to the bottom edge 12 of the laminated glass 10, the third limit point P3 is obtained, and according to the fourth limit theoretical wedge angle value and the distance from the fourth incident point to the bottom edge 12 of the laminated glass 10, the fourth limit point P4 is obtained. The vertices of the preset region S0 include the first limit point P1, the second limit point P2, the third limit point P3, and the fourth limit point P4.

[0199] In the embodiment, the eyebox surface EB10 can have multiple positions due to the height from the ground. The positions of the eyebox surface EB10 at different heights can be divided into a first sub-eyebox surface EB12 at the lowest region, a second sub-eyebox surface EB13 at the normal height region, and a third sub-eyebox surface EB14 at the highest region. Correspondingly, the virtual image surface TB10 has a first sub-virtual image surface TB12 matching the first sub-eyebox surface EB12, a second sub-virtual image surface TB13 matching the second sub-eyebox surface EB13, and a third sub-virtual image surface TB14 matching the third sub-eyebox surface EB14.

[0200] In the embodiment, a first sub-observation point array EB121:m1*n1 is selected on the first sub-eyebox surface EB12. Wherein, m1≥1 and is a natural number, and n1≥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. A second sub-observation point array EB131:m2*n2 is selected on the second sub-eyebox surface EB13. Wherein, m2≥1 and is a natural number, and n2≥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. Wherein, m2 is the same as or different from m1, and n2 is the same as or different from n1. A third sub-observation point array EB141:m3*n3 is selected on the third sub-eyebox surface EB14. Wherein, m3≥1 and is a natural number, and n3≥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.

[0201] In the embodiment, a first sub-virtual image point array TB121:i1*j1 is selected on the first sub-virtual image surface TB12. Wherein, i1≥1 and is a natural number, and j1≥1 and is a natural number. For example, i1 can be but is not limited to 3, 5, or 8, and j1 can be but is not limited to 3, 5, or 8. A second sub-virtual image point array TB131:i2*j2 is selected on the second sub-virtual image surface TB13. Wherein, i2≥1 and is a natural number, and j2≥1 and is a natural number. For example, i2 can be but is not limited to 3, 5, or 8, and j2 can be but is not limited to 3, 5, or 8. Wherein, i2 is the same as or different from i1, and j2 is the same as or different from j1. A third sub-virtual image point array TB141:i3*j3 is selected on the third sub-virtual image surface TB14. Wherein, i3≥1 and is a natural number, and j3≥1 and is a natural number. For example, i3 can be but is not limited to 3, 5, or 8, and j3 can be but is not limited to 3, 5, or 8. i3 is the same as or different from i1 and i2, and j3 is the same as or different from j1 and j2. It should be noted that i1*j1 is the same as or different from m1*n1, i2*j2 is the same as or different from m2*n2, and i3*j3 is the same as or different from m3*n3.

[0202] Next, the calculation of the first limit point P1, the second limit point P2, the third limit point P3 and the fourth limit point P4 is described in detail.

[0203] The bottom point of the median line of the first sub-eye box face EB12 and the center point of the first sub-virtual image face TB12 are connected to obtain a first connecting line, the first connecting line intersects the projection display area 11 at a first incident point, the top point of the median line of the second sub-eye box face EB13 and the top-left corner point of the second sub-virtual image face TB13 are connected to obtain a second connecting line, the second connecting line intersects the projection display area 11 at a second incident point, the top point of the median line of the third sub-eye box face EB14 and the center point of the third sub-virtual image face TB14 are connected to obtain a third connecting line, the third connecting line intersects the projection display area 11 at a third incident point, and the bottom point of the median line of the second sub-eye box face EB13 and the bottom-right corner point of the second sub-virtual image face TB13 are connected to obtain a fourth connecting line, the fourth connecting line intersects the projection display area 11 at a fourth incident point.

[0204] According to the projection assembly 20, the laminated glass 10, the first connecting line, the second connecting line, the third connecting line and the fourth connecting line, a first limit theoretical wedge angle value at which there is no reflected ghost at the first incident point, a second limit theoretical wedge angle value at which there is no reflected ghost at the second incident point, a third limit theoretical wedge angle value at which there is no reflected ghost at the third incident point and a fourth limit theoretical wedge angle value at which there is no reflected ghost at the fourth incident point are calculated.

[0205] According to the first limit theoretical wedge angle value and the distance from the first incident point to the bottom edge 12 of the laminated glass 10, the first limit point P1 is obtained, according to the second limit theoretical wedge angle value and the distance from the second incident point to the bottom edge 12 of the laminated glass 10, the second limit point P2 is obtained, according to the third limit theoretical wedge angle value and the distance from the third incident point to the bottom edge 12 of the laminated glass 10, the third limit point P3 is obtained, and according to the fourth limit theoretical wedge angle value and the distance from the fourth incident point to the bottom edge 12 of the laminated glass 10, the fourth limit point P4 is obtained.

[0206] In the embodiment, the preset area S0 is a quadrilateral, and the preset area S0 is formed by sequentially connecting the first limit point P1, the second limit point P2, the third limit point P3 and the fourth limit point P4. Specifically, the preset area S0 and the adjusted first change curve L11 are in the same coordinate system, the horizontal coordinate is the distance from the bottom edge 12 of the laminated glass 10, and the vertical coordinate is the wedge angle value.

[0207] According to the characteristics of projection imaging, on the first sub-eye box surface EB12, as the observation point of the center point of the first sub-virtual image surface TB12 moves from the bottom point of the median line of the first sub-eye box surface EB12 to the top point, the distance between the intersection point of the line connecting the observation point and the center point of the first sub-virtual image surface TB12 and the bottom edge 12 of the laminated glass 10 becomes larger, and the theoretical wedge angle value required to eliminate the reflection ghosting becomes smaller. Therefore, in the coordinate system of the adjusted first change curve L11, the scattered point distribution of the theoretical wedge angle value without reflection ghosting of the center point of the first sub-virtual image surface TB12 observed on the median line of the first sub-eye box surface EB12 is located in the lower right of the first limiting point P1.

[0208] According to the characteristics of projection imaging, on the second sub-eye box surface EB13, as the observation point of the top left corner point of the second sub-virtual image surface TB13 moves from the top point of the median line of the second sub-eye box surface EB13 to the bottom point, the distance between the intersection point of the line connecting the observation point and the top left corner point of the second sub-virtual image surface TB13 and the bottom edge 12 of the laminated glass 10 becomes smaller, and the theoretical wedge angle value required to eliminate the reflection ghosting becomes larger. Therefore, in the coordinate system of the adjusted first change curve L11, the scattered point distribution of the theoretical wedge angle value without reflection ghosting of the top left corner point of the second sub-virtual image surface TB13 observed on the median line of the second sub-eye box surface EB13 is located in the upper left of the second limiting point P2. Wherein, the scattered point distribution of the theoretical wedge angle value without reflection ghosting of the center point of the second sub-virtual image surface TB13 observed on the median line of the second sub-eye box surface EB13 is also located in the upper left of the second limiting point P2.

[0209] According to the characteristics of projection imaging, on the third sub-eye box surface EB14, as the observation point of the center point of the third sub-virtual image surface TB14 moves from the top point of the median line of the third sub-eye box surface EB14 to the bottom point, the distance between the intersection point of the line connecting the observation point and the center point of the third sub-virtual image surface TB14 and the bottom edge 12 of the laminated glass 10 becomes smaller, and the theoretical wedge angle value required to eliminate the reflection ghosting becomes larger. Therefore, in the coordinate system of the adjusted first change curve L11, the scattered point distribution of the theoretical wedge angle value without reflection ghosting of the center point of the third sub-virtual image surface TB14 observed on the median line of the third sub-eye box surface EB14 is located in the upper left of the third limiting point P3.

[0210] According to the characteristics of the projection imaging, on the second sub-eyebox surface EB13, as the observation point of the lower right corner point of the second sub-virtual image surface TB13 moves from the bottom point of the median line of the second sub-eyebox surface EB13 to the top point, the distance between the intersection point of the line connecting the observation point and the lower right corner point of the second sub-virtual image surface TB13 and the bottom edge 12 of the laminated glass 10 becomes larger, and the required theoretical wedge angle value for eliminating the reflection ghosting becomes smaller. Therefore, in the coordinate system of the adjusted first change curve L11, the scattered point distribution of the theoretical wedge angle value for observing the lower right corner point of the second sub-virtual image surface TB13 on the median line of the second sub-eyebox surface EB13 without reflection ghosting is located in the lower right position of the fourth limiting point P4. Among them, the scattered point distribution of the theoretical wedge angle value for observing the center point of the second sub-virtual image surface TB13 on the median line of the second sub-eyebox surface EB13 without reflection ghosting is also located in the lower right position of the fourth limiting point P4.

[0211] Therefore, the preset region S0 formed by sequentially connecting the first limiting point P1, the second limiting point P2, the third limiting point P3 and the fourth limiting point P4 contains the distribution of multiple theoretical wedge angle values for observing the center point of the projection image 211 from different point positions on the median line of the first sub-eyebox surface EB12, different point positions on the median line of the second sub-eyebox surface EB13 and different point positions on the median line of the third sub-eyebox surface EB14. Therefore, the continuous curve of the actual wedge angle fitting curve L0 contained in the preset region S0 has a smaller deviation from the theoretical wedge angle value for eliminating the reflection ghosting of the center point of the virtual image surface TB10 observed by moving on the median line of the eyebox surface EB10, that is, the wedge angle setting in the projection display area 11 can weaken or even eliminate the reflection ghosting of the center point of the projection image 211 observed dynamically.

[0212] Please refer to Figure 18 , Figure 18 for Figure 17The schematic diagram of the head-up display system provided by the embodiment is adjusted again in the design method of the first variation curve. In the embodiment, after the "first limiting point P1 is obtained according to the first limiting theoretical wedge angle value and the distance from the first incident point to the bottom edge 12 of the laminated glass 10, the second limiting point P2 is obtained according to the second limiting theoretical wedge angle value and the distance from the second incident point to the bottom edge 12 of the laminated glass 10, the third limiting point P3 is obtained according to the third limiting theoretical wedge angle value and the distance from the third incident point to the bottom edge 12 of the laminated glass 10, and the fourth limiting point P4 is obtained according to the fourth limiting theoretical wedge angle value and the distance from the fourth incident point to the bottom edge 12 of the laminated glass 10", the "a plurality of limiting points are calculated according to the plurality of theoretical wedge angle values and the distance from the incident point corresponding to each of the theoretical wedge angle values to the bottom edge 12 of the laminated glass 10" further includes connecting the top point of the median line of the first sub-eye box face EB12 with the center point of the first sub-virtual image face TB12 to obtain a fifth connecting line, the fifth connecting line intersects the projection display area 11 at a fifth incident point, connecting the bottom point of the median line of the third sub-eye box face EB14 with the center point of the third sub-virtual image face TB14 to obtain a sixth connecting line, and the sixth connecting line intersects the projection display area 11 at a sixth incident point. The fifth limiting theoretical wedge angle value at which there is no reflection ghost at the fifth incident point and the sixth limiting theoretical wedge angle value at which there is no reflection ghost at the sixth incident point are calculated according to the projection assembly 20, the laminated glass 10, the fifth connecting line and the sixth connecting line. And the fifth limiting point P5 is obtained according to the fifth limiting theoretical wedge angle value and the distance from the fifth incident point to the bottom edge 12 of the laminated glass 10, and the sixth limiting point P6 is obtained according to the sixth limiting theoretical wedge angle value and the distance from the sixth incident point to the bottom edge 12 of the laminated glass 10. The top point of the preset area S0 further includes the fifth limiting point P5 and the sixth limiting point P6, and the preset area S0 is sequentially connected and formed by the first limiting point P1, the fifth limiting point P5, the second limiting point P2, the third limiting point P3, the sixth limiting point P6 and the fourth limiting point P4.

[0213] Next, the calculation of the fifth limiting point P5 and the sixth limiting point P6 is described in detail.

[0214] Connecting the top point of the median line of the first sub-eye box face EB12 with the center point of the first sub-virtual image face TB12 to obtain a fifth connecting line, the fifth connecting line intersects the projection display area 11 at a fifth incident point, connecting the bottom point of the median line of the third sub-eye box face EB14 with the center point of the third sub-virtual image face TB14 to obtain a sixth connecting line, and the sixth connecting line intersects the projection display area 11 at a sixth incident point.

[0215] The fifth limiting theoretical wedge angle value at the fifth incident point without reflection ghost and the sixth limiting theoretical wedge angle value at the sixth incident point without reflection ghost are calculated according to the projection assembly 20, the laminated glass 10, the fifth connecting line and the sixth connecting line.

[0216] The fifth limiting point P5 is obtained according to the fifth limiting theoretical wedge angle value and the distance from the fifth incident point to the bottom edge 12 of the laminated glass 10, and the sixth limiting point P6 is obtained according to the sixth limiting theoretical wedge angle value and the distance from the sixth incident point to the bottom edge 12 of the laminated glass 10.

[0217] In the embodiment, the preset region S0 is a hexagon, and the preset region S0 is obtained by sequentially connecting the first limiting point P1, the fifth limiting point P5, the second limiting point P2, the third limiting point P3, the sixth limiting point P6 and the fourth limiting point P4. Specifically, the preset region S0 is in the same coordinate system as the adjusted first change curve L11, the horizontal coordinate is the distance from the bottom edge 12 of the laminated glass 10, and the vertical coordinate is the wedge angle value.

[0218] According to the characteristics of the projection imaging, on the first sub-eye box surface EB12, as the observation point from the top point to the bottom point of the median line of the first sub-eye box surface EB12 moves, the distance between the observation point and the intersection point of the connecting line of the center point of the first sub-virtual image surface TB12 and the projection display area 11 and the bottom edge 12 of the laminated glass 10 becomes smaller, and the theoretical wedge angle value required to eliminate the reflection ghost becomes larger. Therefore, in the coordinate system of the adjusted first change curve L11, the scattered point distribution of the theoretical wedge angle value without reflection ghost of the center point of the first sub-virtual image surface TB12 on the median line of the first sub-eye box surface EB12 is located in the upper left of the fifth limiting point P5.

[0219] According to the characteristics of the projection imaging, on the third sub-eye box surface EB14, as the observation point from the bottom point to the top point of the median line of the third sub-eye box surface EB14 moves, the distance between the observation point and the intersection point of the connecting line of the center point of the third sub-virtual image surface TB14 and the projection display area 11 and the bottom edge 12 of the laminated glass 10 becomes larger, and the theoretical wedge angle value required to eliminate the reflection ghost becomes smaller. Therefore, in the coordinate system of the adjusted first change curve L11, the scattered point distribution of the theoretical wedge angle value without reflection ghost of the center point of the third sub-virtual image surface TB14 on the median line of the third sub-eye box surface EB14 is located in the lower right of the sixth limiting point P6.

[0220] Therefore, the preset area S0, formed by the first limiting point P1, the fifth limiting point P5, the second limiting point P2, the third limiting point P3, the sixth limiting point P6, and the fourth limiting point P4 connected sequentially, more precisely includes multiple theoretical wedge angle values ​​that allow for the absence of ghosting at the center point of the virtual image surface TB10 when observed from different points on the vertical line of the first sub-eye box surface EB12, different points on the vertical line of the second sub-eye box surface EB13, and different points on the vertical line of the third sub-eye box surface EB14. Therefore, the deviation between the adjusted first variation curve L11, which is a continuous curve contained within the preset area S0, and the theoretical wedge angle value for eliminating reflected ghosting at the center point of the virtual image surface TB10 when observed while moving along the vertical line of the eye box surface EB10, is further reduced. That is, the wedge angle setting in the projection display area 11 can further reduce or even eliminate ghosting at the center point of the virtual image surface TB10 during dynamic observation.

[0221] Please refer to Figure 19 , Figure 19 for Figure 18 This is a schematic diagram of the first variation curve after further adjustment in the design method of the head-up display system provided in the embodiment. In this embodiment, the line connecting the first limiting point P1 and the fourth limiting point P4 is the first limiting line segment P1-P4, and the line connecting the second limiting point P2 and the third limiting point P3 is the second limiting line segment P2-P3. The step of "adjusting the first variation curve so that the adjusted first variation curve has a continuous curve contained within the preset region S0" includes adjusting the first variation curve so that the adjusted first variation curve has a continuous curve contained within the preset region S0, and the adjusted first variation curve intersects with the first limiting line segment P1-P4, and / or, the adjusted first variation curve intersects with the second limiting line segment P2-P3.

[0222] In this embodiment, the first variation curve L10 is adjusted for optimization.

[0223] Specifically, the first variation curve L10 is adjusted so that the adjusted first variation curve L11 has a continuous curve contained in the preset region S0, and the adjusted first variation curve L11 intersects with the first limiting line segment P1-P4, and / or the adjusted first variation curve L11 intersects with the second limiting line segment P2-P3.

[0224] In the embodiment, the adjusted first change curve L11 intersects the first limiting line segment P1-P4, so that the adjusted first change curve L11, while having the continuous curve accommodated in the preset region S0, reduces the deviation value of the theoretical wedge angle value when the first sub-virtual image surface TB12 is observed from the partial points on the median line of the first sub-eye box surface EB12 to have no reflection ghosting near the bottom region, and reduces the deviation value of the theoretical wedge angle value when the second sub-virtual image surface TB13 is observed from the partial points on the median line of the second sub-eye box surface EB13 to have no reflection ghosting near the bottom region.

[0225] In the embodiment, the adjusted first change curve L11 intersects the second limiting line segment P2-P3, so that the adjusted first change curve L11, while having the continuous curve accommodated in the preset region S0, reduces the deviation value of the theoretical wedge angle value when the second sub-virtual image surface TB13 is observed from the partial points on the median line of the second sub-eye box surface EB13 to have no reflection ghosting near the top region, and reduces the deviation value of the theoretical wedge angle value when the third sub-virtual image surface TB14 is observed from the partial points on the median line of the third sub-eye box surface EB14 to have no reflection ghosting near the bottom region.

[0226] In addition, in the embodiment, the distribution of the theoretical wedge angle value of no reflection ghosting obtained by observing the center point of the first sub-virtual image surface TB12 when the human eye moves along the median line of the first sub-eye box surface EB12 from the bottom point to the top point is near the line connecting the first limiting point P1 and the fifth limiting point P5, and preferably the adjusted first change curve L11 extends near the line connecting the first limiting point P1 and the fifth limiting point P5, so that the reflection ghosting of the center region of the first sub-virtual image surface TB12 observed dynamically can be further weakened or even eliminated.

[0227] Further, in the present embodiment, the distribution of the theoretical wedge angle values obtained by observing the center point of the third sub-virtual image surface TB14 without reflection ghost when the human eye moves along the bottom point to the top point of the median line of the third sub-eye box surface EB14 is near the line connecting the third limit point P3 and the sixth limit point P6, and preferably the adjusted first change curve L11 extends along the line connecting the sixth limit point P6 and the third limit point P3, so that the reflection ghost of the center region of the third sub-virtual image surface TB12 observed dynamically can be further weakened or even eliminated.

[0228] Please refer to Figure 20 , Figure 20 for Figure 19 the design method of the head-up display system provided by the present embodiment. In the present embodiment, the "calculating a plurality of limit points according to the plurality of theoretical wedge angle values and the distance from the corresponding incident point to the bottom edge 12 of the laminated glass 10" includes connecting the observation points on the median line of the second sub-eye box surface EB13 and the virtual image points on the second sub-virtual image surface TB13 to obtain a plurality of seventh connecting lines, and the plurality of seventh connecting lines intersect with the projection display area 11 to obtain a plurality of seventh incident points. According to the projection assembly 20, the laminated glass 10 and the plurality of seventh connecting lines, a plurality of seventh limit theoretical wedge angle values without reflection ghost at the plurality of seventh incident points are calculated. And according to the plurality of seventh limit theoretical wedge angle values and the distance from the plurality of seventh incident points to the bottom edge 12 of the laminated glass 10, a scatter point distribution is obtained, and the center of gravity of the scatter point distribution is calculated to obtain a seventh limit point G. The "adjusting the first change curve L10 so that the adjusted first change curve L11 has a continuous curve accommodated in the preset area S0" includes adjusting the first change curve L10 so that the adjusted first change curve L11 has a continuous curve accommodated in the preset area S0, and the adjusted first change curve L11 passes through the seventh limit point G.

[0229] Next, the calculation of the seventh limit point G and the adjustment of the first change curve L10 will be described in detail.

[0230] Connecting the observation points on the median line of the second sub-eye box surface EB13 and the virtual image points on the second sub-virtual image surface TB13 obtains a plurality of seventh connecting lines, and the plurality of seventh connecting lines intersect with the projection display area 11 to obtain a plurality of seventh incident points.

[0231] According to the projection assembly 20, the laminated glass 10 and the plurality of seventh connecting lines, a plurality of seventh limit theoretical wedge angle values without reflection ghost at the plurality of seventh incident points are calculated.

[0232] According to the plurality of seventh limiting theoretical wedge angle values and the distances from the plurality of seventh incident points to the bottom edge 12 of the laminated glass 10, a scatter point distribution is obtained, and a barycenter of the scatter point distribution is calculated to obtain a seventh limiting point G.

[0233] The first change curve L10 is adjusted so that the adjusted first change curve L11 has a continuous curve accommodated in the preset area S0, and the adjusted first change curve L11 passes through the seventh limiting point G.

[0234] In the embodiment, the adjusted first change curve L11 passes through the seventh limiting point G. The seventh limiting point G is a barycenter of a plurality of theoretical wedge angle values corresponding to the second sub-eye box surface EB13 and having no ghosting of the second sub-virtual image surface TB13 observed on the median line of the second sub-eye box surface EB13, that is, the ghosting of the second sub-virtual image surface TB13 observed on the median line of the second sub-eye box surface EB13 is small. Since the second sub-eye box surface EB13 is a normal height of the driver's eyes in the cab, the ghosting of the driver when dynamically observing the projection image 211 is small when the vehicle is in a small or no bump.

[0235] Please refer to Figure 21 , Figure 21 for Figure 19 the design method of the head-up display system provided in the embodiment. The “a plurality of limiting points are calculated according to the plurality of theoretical wedge angle values and the distances from the incident points corresponding to the theoretical wedge angle values to the bottom edge 12 of the laminated glass 10” include connecting a midpoint of the median line of the second sub-eye box surface EB13 and a center point of the second sub-virtual image surface TB13 to obtain an eighth connecting line, and the eighth connecting line intersects with the projection display area 11 to obtain an eighth incident point. The eighth limiting theoretical wedge angle value with no reflection ghosting at the eighth incident point is calculated according to the projection assembly 20, the laminated glass 10, and the eighth connecting line. And the eighth limiting point P8 is obtained according to the eighth limiting theoretical wedge angle value and the distance from the eighth incident point to the bottom edge 12 of the laminated glass 10. The “the first change curve L10 is adjusted so that the adjusted first change curve L11 has a continuous curve accommodated in the preset area S0” includes adjusting the first change curve L10 so that the adjusted first change curve L11 has a continuous curve accommodated in the preset area S0, and the adjusted first change curve L11 passes through the eighth limiting point P8.

[0236] Next, the calculation of the eighth limiting point P8 and the adjustment of the first change curve L10 are described in detail.

[0237] The eighth connecting line is obtained by connecting the middle point on the middle perpendicular line of the second sub-eye box surface EB13 and the center point of the second sub-virtual image surface TB13, and the eighth connecting line intersects with the projection display area 11 to obtain an eighth incident point.

[0238] An eighth limiting theoretical wedge angle value is calculated according to the projection assembly 20, the laminated glass 10 and the eighth incident point.

[0239] An eighth limiting point P8 is obtained according to the eighth limiting theoretical wedge angle value and the distance from the eighth incident point to the bottom edge 12 of the laminated glass 10.

[0240] The first change curve L10 is adjusted so that the adjusted first change curve L11 has a continuous curve accommodated in the preset area S0, and the adjusted first change curve L11 passes through the eighth limiting point P8.

[0241] In the embodiment, the adjusted first change curve L11 passes through the eighth limiting point P8. In a vehicle, the eye position of a driver is usually at the center point of the second sub-eye box surface EB13. Meanwhile, the information with a high information importance level in the projection image 211 is usually displayed at the center point of the projection image 211, i.e., the center point of the second sub-virtual image surface TB13. Therefore, it is important that the eye of the driver observes the center point of the projection image 211 without reflection ghosting when the eye is at the center point of the second sub-eye box surface EB13. Therefore, the adjusted first change curve L11 passes through the eighth limiting point P8, which is beneficial to the driver to observe the projection image 211 when the eye is at the normal position.

[0242] Please refer to Figure 15 In the 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.

[0243] 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, which can make the dispersion degree of the plurality of theoretical wedge angle values smaller, thereby making the dispersion degree of the dispersion diagram smaller, to increase the smoothness of the actual wedge angle fitting curve L0, i.e., to reduce the slope of the actual wedge angle fitting curve L0, 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 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 theoretical wedge angle values at a position X from the bottom edge 12 of the laminated glass 10. The overall range value AC of the plurality of theoretical wedge angle values refers to the difference between the maximum value and the minimum value of all the theoretical wedge angle values.

[0244] Please refer to Figure 22 , Figure 22 for Figure 13 the design method of the head-up display system provided in the embodiments. In the present embodiment, the at least one projection display area 11 includes at least two first projection display areas 114 or at least two second projection display areas 115, and at least two adjusted first change curves L11 of the wedge angle with respect to the distance of the incident point to the bottom edge 12 of the laminated glass 10 are fitted. When the maximum deviation value of the adjacent two adjusted first change curves L11 is greater than 0.15 mrad, after the wedge angle value of the laminated glass 10 in the corresponding projection display area 11 is determined according to the adjusted first change curve L11, 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 TB10 of one of the adjacent two adjusted first change curves L11. A new plurality of theoretical wedge angle values are recalculated. According to the new plurality of theoretical wedge angle values and the distance of the incident point to the bottom edge 12 of the laminated glass 10 corresponding to each theoretical wedge angle value, a new first change curve L10 of the wedge angle with respect to the distance of the incident point to the bottom edge 12 of the laminated glass 10 is fitted, and a new preset area S1 is calculated. The new first change curve L10 is adjusted so that the adjusted new first change curve L12 has a continuous curve accommodated in the new preset area S1. And it is judged whether the maximum deviation value of the adjusted new first change curve L12 and the other of the adjacent two adjusted first change curves L11 is less than or equal to 0.15 mrad. If not, repeat the above steps. If yes, the wedge angle value of the laminated glass 10 in the corresponding first projection display area 114 or second projection display area 115 is determined according to the new adjusted new first change curve L12.

[0245] In the embodiment, when the two adjacent adjusted first variation curves L11 have an overlapping part, the maximum deviation value is equal to the maximum value in the difference of the two adjusted first variation curves L11 in the overlapping part; when the two adjacent adjusted first variation curves L11 have no overlapping part, the maximum deviation value is equal to the difference of the wedge angle values of the two most adjacent ends of the two adjusted first variation curves L11.

[0246] When the maximum deviation value is greater than 0.15 mrad, the distance between the eyebox surface EB10 and the virtual image surface TB10 corresponding to any one of the two adjacent adjusted first variation curves L11 needs to be adjusted to adjust the maximum deviation value of the two designed adjusted first variation curves L11 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.

[0247] Specifically, after the “determining the wedge angle value of the laminated glass 10 in the corresponding projection display area 11 according to the adjusted first variation curve L11”, at least one of the two adjacent adjusted first variation curves L11 needs to be adjusted.

[0248] Adjusting the distance between the eyebox surface EB10 and the virtual image surface TB10 corresponding to one of the two adjacent adjusted first variation curves L11.

[0249] Wherein, adjusting the distance between the eyebox surface EB10 and the virtual image surface TB10 corresponding to one of the two adjacent adjusted first variation curves L11 can adjust the wedge angle value required to eliminate reflection ghosting. Under the same conditions, the greater the distance between the eyebox surface EB10 and the virtual image surface TB10 corresponding to one of the two adjacent adjusted first variation curves L11, the smaller the wedge angle value required to eliminate reflection ghosting. In the embodiment, the distance between the virtual image surface TB10 corresponding to one of the two adjusted first variation curves L11 and the eyebox surface EB10 can be increased, and / or the distance between the virtual image surface TB10 corresponding to the other adjusted first variation curve L11 and the eyebox surface EB10 can be reduced, so that the two adjacent adjusted first variation curves L11 are closer to the design target.

[0250] Recalculating to obtain a new plurality of theoretical wedge angle values.

[0251] In the embodiment, after adjusting the distance between the virtual image surface TB10 and the eyebox surface EB10, the plurality of theoretical wedge angle values calculated by the calculation method of the foregoing embodiment can fit a new first variation curve L10 that is closer to the design target.

[0252] According to the new plurality of theoretical wedge angle values and the distance from the incident point to the bottom edge 12 of the laminated glass 10 corresponding to each theoretical wedge angle value, a new first change curve L10 of the wedge angle with the distance from the incident point to the bottom edge 12 of the laminated glass 10 is fitted, and a new preset area S1 is calculated.

[0253] The new first change curve L10 is adjusted so that the adjusted new first change curve L12 has a continuous curve accommodated in the new preset area S1.

[0254] It is judged whether the maximum deviation value of the adjusted new first change curve L12 and the other one of the two adjacent adjusted first change curves L11 is less than or equal to 0.15 mrad.

[0255] In the present embodiment, it is judged whether the maximum deviation value of the adjusted new first change curve L12 and the other one of the two adjacent adjusted first change curves L11 is less than or equal to 0.15 mrad. If not, the distance between the eyebox surface EB10 and the virtual image surface TB10 corresponding to one of the two adjacent adjusted first change curves L11 is repeatedly adjusted. If yes, the selection of the wedge angle value is performed.

[0256] The wedge angle value of the laminated glass 10 corresponding to the first projection display area 114 or the second projection display area 115 is determined according to the adjusted new first change curve L12.

[0257] Please refer to Figure 23 , Figure 23 for Figure 13The design method of the head-up display system provided by the embodiment includes the following steps. The at least one projection display area 11 includes at least one first projection display area 114 and at least one second projection display area 115. At least two adjusted first variation curves L11 of wedge angle with respect to the distance from the incident point to the bottom edge 12 of the laminated glass 10 are obtained by fitting. When the maximum deviation value of the adjacent two adjusted first variation curves L11 is greater than 0.2 mrad, after the step of "determining the wedge angle value of the laminated glass 10 in the corresponding projection display area 11 according to the adjusted first variation curve L11", the design method of the head-up display system 1 further includes the following steps. Adjusting the distance between the eyebox surface EB10 and the corresponding virtual image surface TB10 of one of the adjacent two adjusted first variation curves L11. Recalculating a new plurality of theoretical wedge angle values. According to the new plurality of theoretical wedge angle values and the distance from the incident point to the bottom edge 12 of the laminated glass 10 corresponding to each theoretical wedge angle value, a new first variation curve L10 of wedge angle with respect to the distance from the incident point to the bottom edge 12 of the laminated glass 10 is obtained by fitting, and a new preset area S1 is calculated. Adjusting the new first variation curve L10, so that the adjusted new first variation curve L12 has a continuous curve accommodated in the new preset area S1. And judging whether the maximum deviation value of the adjusted new first variation curve and the other of the two adjusted first variation curves is less than or equal to 0.2 mrad. If not, repeat the above steps. If yes, determine the wedge angle value of the laminated glass 10 in the corresponding first projection display area 114 or second projection display area 115 according to the adjusted new first variation curve.

[0258] In the embodiment, when the adjacent two adjusted first variation curves L11 have an overlapping portion, the maximum deviation value is equal to the maximum value of the difference between the two adjusted first variation curves L11 in the overlapping portion; when the adjacent two adjusted first variation curves L11 have no overlapping portion, the maximum deviation value is equal to the difference between the wedge angle values of the most adjacent two ends of the two adjusted first variation curves L11.

[0259] When the maximum deviation value is greater than 0.2 mrad, the distance between the eyebox surface EB10 and the corresponding virtual image surface TB10 of any one of the adjacent two adjusted first variation curves L11 needs to be adjusted to adjust the maximum deviation value of the two designed adjusted first variation curves L11 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.

[0260] Specifically, after the "determination of the wedge angle value of the laminated glass 10 corresponding to the projection display area 11 according to the adjusted first change curve L11", at least one of the two adjacent adjusted first change curves L11 needs to be adjusted.

[0261] Adjust the distance between the eyebox surface EB10 and the virtual image surface TB10 corresponding to one of the two adjacent adjusted first change curves L11.

[0262] Wherein, adjusting the distance between the eyebox surface EB10 and the virtual image surface TB10 corresponding to one of the two adjacent adjusted first change curves L11 can adjust the wedge angle value required to eliminate reflection ghosting. Under the same conditions, the greater the distance between the eyebox surface EB10 and the virtual image surface TB10 corresponding to one of the two adjacent adjusted first change curves L11, the smaller the wedge angle value required to eliminate reflection ghosting. In this embodiment, the distance between the virtual image surface TB10 corresponding to one of the two adjusted first change curves L11 and the eyebox surface EB10 can be increased, and / or the distance between the virtual image surface TB10 corresponding to the other adjusted first change curve L11 and the eyebox surface EB10 can be reduced, so that the two adjacent adjusted first change curves L11 are closer to the design target.

[0263] Recalculate to obtain a new plurality of the theoretical wedge angle values.

[0264] In this embodiment, after adjusting the distance between the virtual image surface TB10 and the eyebox surface EB10, the plurality of theoretical wedge angle values calculated by the calculation method of the foregoing embodiment can fit a new first change curve L10 that is closer to the design target.

[0265] According to the new plurality of theoretical wedge angle values and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge 12 of the laminated glass 10, a new first change curve L10 of the wedge angle with the distance from the incident point to the bottom edge 12 of the laminated glass 10 is fitted, and a new preset area S1 is calculated.

[0266] Adjust the new first change curve L10 so that the adjusted new first change curve L12 has a continuous curve accommodated in the new preset area S1.

[0267] Determine whether the maximum deviation value of the adjusted new first change curve L12 and the other of the two adjacent adjusted first change curves L11 is less than or equal to 0.2 mrad.

[0268] In the embodiment, it is judged whether the maximum deviation value between the adjusted new first variation curve L12 and the other one of the two adjacent adjusted first variation curves L11 is less than or equal to 0.2 mrad. If not, the distance between the eyebox surface EB10 and the virtual image surface TB10 corresponding to one of the two adjacent adjusted first variation curves L11 is adjusted again. If yes, the selection of the wedge angle value is performed.

[0269] The wedge angle value of the laminated glass 10 in the corresponding first projection display area 114 or the second projection display area 115 is determined according to the adjusted new first variation curve L12.

[0270] Please refer to Figure 23 In the embodiment, the set of new multiple theoretical wedge angle values has a maximum local range value AWU and a global range value ACU, and the ratio of AWU to ACU is AWU / ACU≤0.9.

[0271] In the embodiment, the set of multiple theoretical wedge angle values corresponding to the adjusted first projection display area 114 and the set of multiple theoretical wedge angle values corresponding to the second projection display area 115 have a maximum local range value AWU and a global range value ACU, and the ratio of AWU to ACU is AWU / ACU≤0.9. This can make the global dispersion of the multiple theoretical wedge angle values smaller, thereby increasing the smoothness of the adjusted first variation curve L11 and the adjusted new first variation curve L12, i.e. reducing the global slope of the adjusted first variation curve L11 and the adjusted new first variation curve L12, thereby reducing the global wedge angle variation rate of the laminated glass 10 and reducing the production difficulty of the laminated glass 10. It should be noted that the set of multiple theoretical wedge angle values has a maximum local range value AWU, which 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 set of multiple theoretical wedge angle values at a position X from the bottom edge 12 of the laminated glass 10. The set of multiple theoretical wedge angle values has a global range value ACU, which refers to the difference between the maximum value and the minimum value of all theoretical wedge angle values.

[0272] Please refer to Figure 24 , Figure 25 and Figure 26 , Figure 24 The design method of the head-up display system provided in the embodiment is a design method of a head-up display system, and the design method includes the following steps: Figure 25 The design method of the head-up display system provided in the embodiment is a design method of a head-up display system, and the design method includes the following steps: Figure 24 The design method of the head-up display system provided in the embodiment is a design method of a head-up display system, and the design method includes the following steps:Figure 26 For Figure 24 The design method of the head-up display system provided by the embodiment provides a theoretical wedge angle value distribution scatter diagram in which three sub-virtual image surfaces are observed from the median lines of the three sub-eye box surfaces without ghosting.

[0273] In an embodiment of the present application, the at least one projection display area 11 includes a first projection display area 114 and a second projection display area 115. The first projection display area 114 corresponds to AR-HUD, and the projection display distance is 10000 mm. The second projection display area 115 corresponds to W-HUD, and the projection display distance is 3200 mm.

[0274] The laminated glass 10 includes a first transparent substrate, an intermediate bonding layer, and a second transparent substrate. The maximum thickness of the first transparent substrate is 1.8 mm, the maximum thickness of the intermediate bonding layer is 0.76 mm, and the maximum thickness of the second transparent substrate is 1.8 mm. When the laminated glass 10 is installed on the front windshield of a vehicle, the installation angle is 27°.

[0275] The vertical radius of curvature R of the first projection display area 114 and the second projection display area 115 is 5400 mm to 5500 mm, and the horizontal radius of curvature R is 2500 mm to 2550 mm.

[0276] The size of the eye box surface EB10 is 120 mm*50 mm, wherein the center of the first sub-eye box surface EB12 is 40 mm lower than the center of the second sub-eye box surface EB13, and the center of the third sub-eye box surface EB14 is 40 mm higher than the center of the second sub-eye box surface EB13.

[0277] For the first projection display area 114, the corresponding downward viewing angle of the first sub-eye box surface EB12 is -1°, the corresponding downward viewing angle of the second sub-eye box surface EB13 is -2.6°, and the corresponding downward viewing angle of the third sub-eye box surface EB14 is -4.2°. The corresponding horizontal viewing angle of the first sub-eye box surface EB12, the second sub-eye box surface EB13, and the third sub-eye box surface EB14 is 0°, and the field of view angle is 10°*4°. The distance from the midpoint of the second sub-eye box surface EB13 to the intersection of the principal axis of the first projection light source 212 and the surface of the laminated glass 10 close to the vehicle interior is 826 mm, and the incidence angle of the first projection light source 212 is 68°.

[0278] For the second projection display area 115, the lower viewing angle corresponding to the first sub-eyebox surface EB12 is -3.9°, the lower viewing angle corresponding to the second sub-eyebox surface EB13 is -5.5°, and the lower viewing angle corresponding to the third sub-eyebox surface EB14 is -7.3°. The horizontal viewing angle corresponding to the first sub-eyebox surface EB12, the second sub-eyebox surface EB13 and the third sub-eyebox surface EB14 is all 0°, and the field of view angle is 7°*2°. The distance from the midpoint of the second sub-eyebox surface EB13 to the intersection of the principal axis of the second projection light source 213 and the surface of the laminated glass 10 close to the inside of the vehicle is 933 mm, and the incidence angle of the first projection light source 212 is 66°.

[0279] The observation point array EB111m*n on the first sub-eyebox surface EB12, the second sub-eyebox surface EB13 and the third sub-eyebox surface EB14 is a 5*3 point array (see Figure 24 ), and the virtual image point array TB111i*j on the two groups of first sub-virtual image surface TB12, second sub-virtual image surface TB13 and third sub-virtual image surface TB14 is all 5*3. According to the design method of the head-up display system 1 in the foregoing embodiment, the theoretical wedge angle values for eliminating ghosting for the first projection display area 114 and the second projection display area 115 are calculated in turn, and are made into a scatter plot. Taking the scatter plot made by the points on the perpendicular line of the second sub-eyebox surface EB13 corresponding to the points on the second sub-virtual image surface TB13 as an example (see Figure 25 ), in the figure, EB_Rm corresponds to the points on the perpendicular line of the second sub-eyebox surface EB13, RiCj represents the points on the second sub-virtual image surface TB13, and EB_Rm and RiCj in combination represent the theoretical wedge angle value when there is no ghosting from the point EB_Rm to the point RiCj. Wherein, m=1, 2, 3, 4, 5. Wherein, i=1, 2, 3, 4, 5; j=1, 2, 3. In addition, the scatter plot of the theoretical wedge angle values for observing the first sub-virtual image surface TB12 from the perpendicular line of the first sub-eyebox surface EB12 and observing the third sub-virtual image surface TB14 from the third sub-eyebox surface EB14 without ghosting is the same as Figure 25 , and the scatter plot as shown in Figure 26 can be calculated. In addition, the scatter plot of the theoretical wedge angle values for observing the virtual image surface TB10 without ghosting from the points on the line parallel to the perpendicular line on the eyebox surface EB10 is approximately the same as Figure 26 . The scatter plot can be calculated. Finally, 1350 theoretical wedge angle values can be calculated, wherein the maximum value is 0.602 mrad, corresponding to a distance of 1289.3 mm from the bottom edge of the laminated glass 10. Wherein, the minimum value is 0.14 mrad, corresponding to a distance of 12615.5 mm from the bottom edge of the laminated glass 10. In addition, the overall range of the 1350 theoretical wedge angle values is ΔCU=0.462 mrad.

[0280] According to the design method of the head-up display system 1, the first limiting point P1 (AR), the second limiting point P2 (AR), the third limiting point P3 (AR), the fourth limiting point P4 (AR), the fifth limiting point P5 (AR), the sixth limiting point P6 (AR), and the seventh limiting point G (AR) for eliminating ghosting in the first projection display area 114 can be calculated. The details are shown in the table below.

[0281]

[0282]

[0283] According to the design method of the head-up display system 1, the first limiting point P1(W), the second limiting point P2(W), the third limiting point P3(W), the fourth limiting point P4(W), the fifth limiting point P5(W), the sixth limiting point P6(W), and the seventh limiting point G(W) for eliminating ghosting in the second projection display area 115 can be calculated. The details are shown in the table below.

[0284] Position Distance X (mm) to the glass bottom edge 12 The point wedge angle value Y (mrad) P1 (W) 346.994 0.522 P5 (W) 428.899 0.398 P2 (W) 520.667 0.301 P3 (W) 510.777 0.224 P6 (W) 393.919 0.344 P4 (W) 314.097 0.479 G (W) 413.730 0.369

[0285] According to the fitted function Y = -6.811248E-09X 3 +1.276708E-05X 2 The adjusted first variation curve L11 is obtained after fitting and adjusting -8.413138E-03X+2.138185, where X = 288~740mm and Y = 0.61~0.14mrad. The adjusted first variation curve L11 passes through regions P1(W)-P5(W)-P2(W)-P3(W)-P6(W)-P4(W) and P1(AR)-P5(AR)-P2(AR)-P3(AR)-P6(AR)-P4(AR), and emerges between P1(W)-P4(W) and P2(AR)-P3(AR). Furthermore, △WU≈0.24mrad and △WU / △CU≈0.52. Therefore, by selecting wedge angle values ​​according to the adjusted first variation curve L11 for the first projection display area 114 and the second projection display area 115, dynamic ghosting can be significantly reduced.

[0286] It is understood that the embodiments and figures of this application illustrate a head-up display system with the projection display area located on the left and a design method for the head-up display system, but are not limited thereto. This application is also applicable to a head-up display system with the projection display area located on the right and a design method for the head-up display system.

[0287] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application, and such improvements and modifications are to be included within the scope of the present 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 has at least one projection display area, each of the projection display areas 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, and has a section with a wedge angle continuously decreasing from the lower side to the upper side, and each point in the section has a measured wedge angle and a plurality of theoretical wedge angle values for eliminating reflection ghosting; An actual wedge angle fitting curve is fitted by the measured wedge angles at each point in the section, a plurality of limit points are calculated according to the plurality of theoretical wedge angle values at each point in the section and the distance from the incident point corresponding to each of the theoretical wedge angle values to the bottom edge of the laminated glass, the plurality of limit points are sequentially connected to form a preset area, and the actual wedge angle fitting curve has a continuous curve accommodated in the preset area; The projection assembly comprises at least one projection light source capable of projecting onto the at least one projection display area, and the projection light emitted by the projection light source forms a projection image when incident on the projection display area; The head-up display system comprises a first eye box, a second eye box and a third eye box from low to high, and the projection image comprises a first sub-projection image, a second sub-projection image and a third sub-projection image from high to low; The preset area is a polygon, and the plurality of limit points comprise a first limit point, a second limit point, a third limit point and a fourth limit point; A first connecting line is obtained by connecting the bottom point of the median line of the first eye box with the center point of the first sub-projection image, the coordinate information of the first limit point comprises the distance from the intersection point of the first connecting line and the projection display area to the bottom edge of the laminated glass, and the theoretical wedge angle value without reflection ghosting is obtained by observing the center point of the first sub-projection image from the bottom point of the median line of the first eye box; A second connecting line is obtained by connecting the top point of the median line of the second eye box with the upper left corner point of the second sub-projection image, the coordinate information of the second limit point comprises the distance from the intersection point of the second connecting line and the projection display area to the bottom edge of the laminated glass, and the theoretical wedge angle value without reflection ghosting is obtained by observing the upper left corner point of the second sub-projection image from the top point of the median line of the second eye box; A third connecting line is obtained by connecting the top point of the median line of the third eye box with the center point of the third sub-projection image, the coordinate information of the third limit point comprises the distance from the intersection point of the third connecting line and the projection display area to the bottom edge of the laminated glass, and the theoretical wedge angle value without reflection ghosting is obtained by observing the center point of the third sub-projection image from the top point of the median line of the third eye box; A fourth connecting line is obtained by connecting the bottom point of the median line of the second eye box with the lower right corner point of the second sub-projection image, the coordinate information of the fourth limit point comprises the distance from the intersection point of the fourth connecting line and the projection display area to the bottom edge of the laminated glass, and the theoretical wedge angle value without reflection ghosting is obtained by observing the lower right corner point of the second sub-projection image from the bottom point of the median line of the second eye box.

2. The heads-up display system of claim 1, wherein, The first change curve is fitted by fitting a plurality of theoretical wedge angle values at positions of each point in the section, and a maximum deviation value of the actual wedge angle fitting curve and the first change curve is less than or equal to 0.15 mrad.

3. The heads-up display system of claim 2, wherein, The wedge angle in the section continuously and nonlinearly decreases from the lower side to the upper side, and the actual wedge angle fitting curve and the first change curve both conform to a 1-4 order function.

4. The heads-up display system of claim 1, wherein, The plurality of limit points further include a fifth limit point and a sixth limit point, and the preset area is formed by sequentially connecting the first limit point, the fifth limit point, the second limit point, the third limit point, the sixth limit point, and the fourth limit point. A fifth connecting line is obtained by connecting the top point of the median line of the first eye box and the center point of the first sub-projection image, and the coordinate information of the fifth limit point includes a distance from the intersection point of the fifth connecting line and the projection display area to the bottom edge of the laminated glass, and a theoretical wedge angle value without reflection ghost observed from the center point of the first sub-projection image at the top point of the median line of the first eye box. A sixth connecting line is obtained by connecting the bottom point of the median line of the third eye box and the center point of the third sub-projection image, and the coordinate information of the sixth limit point includes a distance from the intersection point of the sixth connecting line and the projection display area to the bottom edge of the laminated glass, and a theoretical wedge angle value without reflection ghost observed from the center point of the third sub-projection image at the bottom point of the median line of the third eye box.

5. The heads-up display system of claim 1, wherein, The first limit point and the fourth limit point form a first limit line segment, the second limit point and the third limit point form a second limit line segment, the actual wedge angle fitting curve intersects the first limit line segment, and / or the actual wedge angle fitting curve intersects the second limit line segment.

6. The heads-up display system of any one of claims 1, 4, or 5, wherein, The actual wedge angle fitting curve passes through a seventh limit point, and the seventh limit point is a barycenter of a plurality of theoretical wedge angle values without reflection ghost corresponding to each point of the median line of the second eye box observing the second sub-projection image distributed in a coordinate system of the actual wedge angle fitting curve.

7. The heads-up display system of any one of claims 1, 4, or 5, wherein, The actual wedge angle fitting curve passes through an eighth limit point, an eighth connecting line is obtained by connecting the midpoint of the median line of the second eye box and the center point of the second sub-projection image, and the coordinate information of the eighth limit point includes a distance from the intersection point of the eighth connecting line and the projection display area to the bottom edge of the laminated glass, and a theoretical wedge angle value without reflection ghost observed from the center point of the second sub-projection image at the midpoint of the median line of the second eye box.

8. The heads-up display system of claim 1, wherein, In a direction in which the bottom edge of the laminated glass points to the top edge, a ratio of the length of the section to the length of the projection display area is not less than 70%.

9. The heads-up display system of claim 1, wherein, The at least one projection display area includes: At least one first projection display area, the projection light source is incident to the first projection display area to form a first projection image, and a virtual image distance of the first projection image is 7 meters-100 meters; and At least one second projection display area, the projection light source is incident to the second projection display area to form a second projection image, and a virtual image distance of the second projection image is 1 meter-6 meters.

10. The heads-up display system of claim 9, wherein, The projection assembly comprises at least one first projection light source and at least one second projection light source, the first projection light source is incident to the first projection display area, and the second projection light source is incident to the second projection display area.

11. A method of designing a head-up display system, characterized by The design method of the head-up display system comprises: Providing a projection assembly and a laminated glass, the projection light emitted by the projection assembly is incident to at least one projection display area on the laminated glass; Designing an eyebox surface in the vehicle according to an observer in the vehicle; Designing a virtual image surface according to the projection image observed by each projection display area through the observer; The eyebox surface comprises a plurality of sub-eyebox surfaces in turn from low to high, and the virtual image surface comprises a plurality of sub-virtual image surfaces in turn from high to low, wherein each sub-virtual image surface 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 line connecting a point in the observation point array and a point in the virtual image point array passes through the corresponding projection display area, and the intersection of the line and the projection display area is an incident point; According to the projection assembly, the laminated glass, and a plurality of lines, calculating a plurality of theoretical wedge angle values of the laminated glass at which the projection image has no reflection ghosting at the position of the corresponding incident point; According to the plurality of theoretical wedge angle values and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge of the laminated glass, fitting a first change curve of the wedge angle with the distance from the incident point to the bottom edge of the laminated glass to obtain a first change curve of the wedge angle with the distance from the incident point to the bottom edge of the laminated glass; According to the plurality of theoretical wedge angle values and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge of the laminated glass, calculating a plurality of limit points, and sequentially connecting the plurality of limit points to form a preset area; Adjusting the first change curve, so that the adjusted first change curve has a continuous curve accommodated in the preset area; According to the adjusted first change curve, determining the wedge angle value of the laminated glass at the corresponding projection display area.

12. The design method of the head-up display system according to claim 11, wherein The adjusted first change curve conforms to a 1-4 order function and has a continuous curve with continuously decreasing nonlinearity.

13. The design method of a head-up display system according to claim 11, wherein The eyebox surface comprises a first sub-eyebox surface, a second sub-eyebox surface, and a third sub-eyebox surface in turn from low to high; the virtual image surface comprises a first sub-virtual image surface, a second sub-virtual image surface, and a third sub-virtual image surface in turn from high to low; the preset area is a polygon, and the plurality of limit points comprise a first limit point, a second limit point, a third limit point, and a fourth limit point; The "calculating a plurality of limit points according to the plurality of theoretical wedge angle values and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge of the laminated glass" comprises: connecting a bottom point of a median line of the first sub-eye box face and a center point of the first sub-virtual image face to obtain a first connecting line, the first connecting line intersecting the projection display area at a first incident point, connecting a top point of a median line of the second sub-eye box face and a top-left corner point of the second sub-virtual image face to obtain a second connecting line, the second connecting line intersecting the projection display area at a second incident point, connecting a top point of a median line of the third sub-eye box face and a center point of the third sub-virtual image face to obtain a third connecting line, the third connecting line intersecting the projection display area at a third incident point, and connecting a bottom point of a median line of the second sub-eye box face and a bottom-right corner point of the second sub-virtual image face to obtain a fourth connecting line, the fourth connecting line intersecting the projection display area at a fourth incident point; calculating, according to the projection assembly, the laminated glass, the first connecting line, the second connecting line, the third connecting line and the fourth connecting line, a first limiting theoretical wedge angle value at which there is no reflection ghost at the first incident point, a second limiting theoretical wedge angle value at which there is no reflection ghost at the second incident point, a third limiting theoretical wedge angle value at which there is no reflection ghost at the third incident point, and a fourth limiting theoretical wedge angle value at which there is no reflection ghost at the fourth incident point; and obtaining a first limiting point according to the first limiting theoretical wedge angle value and a distance from the first incident point to a bottom edge of the laminated glass, a second limiting point according to the second limiting theoretical wedge angle value and a distance from the second incident point to the bottom edge of the laminated glass, a third limiting point according to the third limiting theoretical wedge angle value and a distance from the third incident point to the bottom edge of the laminated glass, and a fourth limiting point according to the fourth limiting theoretical wedge angle value and a distance from the fourth incident point to the bottom edge of the laminated glass.

14. The design method of a head-up display system according to claim 13, wherein After the "obtaining a first limiting point according to the first limiting theoretical wedge angle value and a distance from the first incident point to a bottom edge of the laminated glass, a second limiting point according to the second limiting theoretical wedge angle value and a distance from the second incident point to the bottom edge of the laminated glass, a third limiting point according to the third limiting theoretical wedge angle value and a distance from the third incident point to the bottom edge of the laminated glass, and a fourth limiting point according to the fourth limiting theoretical wedge angle value and a distance from the fourth incident point to the bottom edge of the laminated glass", the "calculating a plurality of limiting points according to the plurality of theoretical wedge angle values and distances from the incident points corresponding to the respective theoretical wedge angle values to the bottom edge of the laminated glass" further comprises: connecting a top point of a median line of the first sub-eye box face and a center point of the first sub-virtual image face to obtain a fifth connecting line, the fifth connecting line intersecting the projection display area at a fifth incident point, and connecting a bottom point of a median line of the third sub-eye box face and a center point of the third sub-virtual image face to obtain a sixth connecting line, the sixth connecting line intersecting the projection display area at a sixth incident point; calculating, according to the projection assembly, the laminated glass, the fifth connecting line and the sixth connecting line, a fifth limiting theoretical wedge angle value at which there is no reflection ghost at the fifth incident point and a sixth limiting theoretical wedge angle value at which there is no reflection ghost at the sixth incident point; and A fifth limit point is obtained according to the fifth limit theoretical wedge angle value and the distance from the fifth incident point to the bottom edge of the laminated glass, and a sixth limit point is obtained according to the sixth limit theoretical wedge angle value and the distance from the sixth incident point to the bottom edge of the laminated glass; The vertex of the preset area further includes the fifth limit point and the sixth limit point, and the preset area is formed by sequentially connecting the first limit point, the fifth limit point, the second limit point, the third limit point, the sixth limit point and the fourth limit point.

15. The design method of a head-up display system according to claim 14, wherein The line segment connecting the first limit point and the fourth limit point is a first limit line segment, the line segment connecting the second limit point and the third limit point is a second limit line segment, and the "adjusting the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area" includes: adjusting the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area, and the adjusted first change curve intersects the first limit line segment, and / or the adjusted first change curve intersects the second limit line segment.

16. The design method of a head-up display system according to any one of claims 13 to 15, characterized in that, The "calculating a plurality of limit points according to the plurality of theoretical wedge angle values and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge of the laminated glass" includes: connecting the observation point on the median line of the second sub-eye box face and the virtual image point on the second sub-virtual image face to obtain a plurality of seventh connecting lines, and the plurality of seventh connecting lines intersect the projection display area to obtain a plurality of seventh incident points; calculating a plurality of seventh limit theoretical wedge angle values at the plurality of seventh incident points without reflection ghosting according to the projection assembly, the laminated glass and the plurality of seventh connecting lines; and calculating a scatter point distribution according to the plurality of seventh limit theoretical wedge angle values and the distance from the plurality of seventh incident points to the bottom edge of the laminated glass, and calculating a seventh limit point according to the center of gravity of the scatter point distribution; The "adjusting the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area" includes: adjusting the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area, and the adjusted first change curve passes through the seventh limit point.

17. The design method of a head-up display system according to any one of claims 13 to 15, characterized in that, The "calculating a plurality of limit points according to the plurality of theoretical wedge angle values and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge of the laminated glass" includes: connecting the midpoint of the median line of the second sub-eye box face and the center point of the second sub-virtual image face to obtain an eighth connecting line, and the eighth connecting line intersects the projection display area to obtain an eighth incident point; calculating an eighth limit theoretical wedge angle value at the eighth incident point without reflection ghosting according to the projection assembly, the laminated glass and the eighth connecting line; and calculating an eighth limit point according to the eighth limit theoretical wedge angle value and the distance from the eighth incident point to the bottom edge of the laminated glass; The "adjusting the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area" includes: Adjust the first change curve, so that the adjusted first change curve has a continuous curve accommodated in the preset region, and the adjusted first change curve passes through the eighth limit point.

18. The design method of a head-up display system according to claim 11, 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.

19. The design method of a head-up display system according to claim 11, wherein, The at least one projection display area includes at least two first projection display areas or at least two second projection display areas, at least two adjusted first change curves of wedge angle with respect to the distance from the incident point to the bottom edge of the laminated glass are fitted, and when the maximum deviation value of the adjacent two adjusted first change curves is greater than 0.15 mrad, after the step of "determining the wedge angle value of the laminated glass in the corresponding projection display area according to the adjusted first change 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 two adjacent adjusted first change curves; Recalculating a new plurality of theoretical wedge angle values; Fitting a new first change curve of wedge angle with respect to the distance from the incident point to the bottom edge of the laminated glass according to the new plurality of theoretical wedge angle values and the distance from the incident point to the bottom edge of the laminated glass corresponding to each theoretical wedge angle value, and calculating a new preset region; Adjusting the new first change curve, so that the adjusted new first change curve has a continuous curve accommodated in the new preset region; and Determining whether the maximum deviation value of the adjusted new first change curve and the other of the two adjacent adjusted first change curves is less than or equal to 0.15 mrad; If not, repeat the above steps; If yes, determining the wedge angle value of the laminated glass in the corresponding first projection display area or second projection display area according to the adjusted new first change curve.

20. The design method of a head-up display system according to claim 11, wherein, The at least one projection display area includes at least one first projection display area and at least one second projection display area, at least two adjusted first change curves of wedge angle with respect to the distance from the incident point to the bottom edge of the laminated glass are fitted, and when the maximum deviation value of the adjacent two adjusted first change curves is greater than 0.2 mrad, after the step of "determining the wedge angle value of the laminated glass in the corresponding projection display area according to the adjusted first change 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 two adjacent adjusted first change curves; Recalculating a new plurality of theoretical wedge angle values; Fitting a new first change curve of wedge angle with respect to the distance from the incident point to the bottom edge of the laminated glass according to the new plurality of theoretical wedge angle values and the distance from the incident point to the bottom edge of the laminated glass corresponding to each theoretical wedge angle value, and calculating a new preset region; Adjusting the new first change curve, so that the adjusted new first change curve has a continuous curve accommodated in the new preset region; and Determining whether the maximum deviation value of the adjusted new first change curve and the other of the two adjacent adjusted first change curves is less than or equal to 0.15 mrad; determining whether the maximum deviation value of the adjusted new first variation curve and another one of the two adjacent adjusted first variation curves is less than or equal to 0.2 mrad; if not, repeating the above steps; if yes, determining the wedge angle value of the laminated glass corresponding to the first projection display area or the second projection display area according to the adjusted new first variation curve.

21. The design method of a head-up display system according to claim 20, wherein, The new set of the plurality of theoretical wedge angle values has a maximum local range value AWU, and the new set of the plurality of theoretical wedge angle values has a global range value ACU, and the ratio of AWU to ACU is: AWU / ACU≤0.9.

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