Head-up display system and method for designing a head-up display system

Abstract

In the present application, a head-up display system and a method for designing a head-up display system are provided. The head-up display system includes 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 in which the thickness of the laminated glass at the upper edge of the projection display area is greater than the thickness of the laminated glass at the lower edge of the projection display area when the laminated glass is attached to the vehicle, and has segments in which the wedge angle continuously decreases from the lower edge to the upper edge. There are a measured wedge angle at any point in the segment and a plurality of theoretical wedge angle values for removing reflection ghosts. The measured wedge angles at the positions of each point in the segment are fitted to obtain an approximate curve of the actual wedge angle. The approximate curve of the actual wedge angle has a continuous curve accommodated in a preset area. The projection assembly includes at least one projection light source that can project onto at least one projection display area. Projection light rays emitted from the projection light source are incident on the projection display area to form a projection image. With the head-up display system provided in the present application, it is possible to weaken and even remove reflection ghosts when dynamically observing a head-up display image at multiple points.

Description

Technical Field

[0001] This application relates to the field of vehicles, and specifically to a head-up display system and a design method for a head-up display system.

Background Art

[0002] As vehicle intelligence progresses, head-up display (HUD) systems are being increasingly applied to vehicles. Images such as driving information are displayed in real time in front of the windshield through the head-up display system. When the vehicle is driving on a road surface with a changing slope or an uneven surface, it will sway to a certain extent, so the position of the driver's eyes changes relatively in the direction perpendicular to the road surface. In this case, ghosts will occur or be enhanced in the HUD image observed by the driver. This is equivalent to observing the HUD image at a position higher or lower than a specific position of the eyes. The ghosts in this case are called overall dynamic ghosts.

[0003] Also, in the actual manufacturing process of the bonding glass, the curve of the wedge angle of the wedge-shaped intermediate PVB film is not ideally smooth, and its local undulations also result in uneven distribution of ghosts on the same virtual image plane, which may cause or enhance ghosts locally in the HUD image observed by the driver. The ghosts in this case are called local dynamic ghosts.

[0004] The above overall dynamic ghosts and local dynamic ghosts are collectively called dynamic ghosts. Both mean that the size of the ghosts in the HUD image changes dynamically with the movement of the driver's eye observation position, which causes ghosts to occur or be enhanced during the actual use of the HUD image and affects the driving experience.

Summary of the Invention

[0005] In a first aspect, an embodiment of the present application provides a head-up display system. The head-up display system includes a laminated glass and a projection assembly. The laminated glass has at least one projection display area, and each projection display area has a wedge-shaped cross-sectional shape in which the thickness of the laminated glass at the upper edge of the projection display area is greater than the thickness of the laminated glass at the lower edge of the projection display area when the laminated glass is attached to the vehicle, and has a segment in which the wedge angle continuously decreases from the lower edge to the upper edge. At any point in the segment, there are a measured wedge angle and a plurality of theoretical wedge angle values of the reflection ghost when there is no . Fitting the measured wedge angle at each point in the segment to obtain an approximate curve of the actual wedge angle, and calculating a plurality of position limit points based on the plurality of theoretical wedge angle values at each point in the segment and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge of the laminated glass. The plurality of position limit points are sequentially connected to form a preset area, and the approximate curve of the actual wedge angle has a continuous curve accommodated in the preset area. The projection assembly includes at least one projection light source capable of projecting onto at least one projection display area, and the projection light emitted from the projection light source is incident on the projection display area to form a projection image.

[0006] In a second aspect, an embodiment of the present application further provides a design method for a head-up display system. The design method of the head-up display system is to provide a projection assembly and a laminated glass, wherein the projection light emitted from the projection assembly is incident on at least one projection display area of the laminated glass, to design an instrument panel surface located in the vehicle based on an observer in the vehicle, to design a virtual image surface based on the projection images observed by the observer in the vehicle through each projection display area, Here, the glove box surface includes a plurality of sub - glove box surfaces sequentially arranged from low to high, and the virtual image surface correspondingly includes a plurality of sub - virtual image surfaces sequentially arranged from high to low. Each sub - virtual image surface corresponds to one sub - glove box surface, selecting an observation dot matrix on each sub - glove box surface and selecting a virtual image dot matrix on each sub - virtual image surface, wherein the connection line between the points in the observation dot matrix and the points in the virtual image dot matrix passes through the corresponding projection display area, and the intersection point of the connection line and the projection display area is the incident point, and the selecting, calculating a plurality of theoretical wedge angle values of the alignment glass when the projection image has no reflection ghost at the corresponding incident point based on the projection assembly, the alignment glass, and the plurality of connection lines, fitting based on 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 alignment glass to obtain a first change curve of the wedge angle with respect to the distance from the incident point to the bottom edge of the alignment glass, calculating a plurality of position - limiting points based on 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 alignment glass, and sequentially connecting the plurality of position - limiting points to form a closed shape enclosing a preset area, adjusting the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area, determining the wedge angle value in the corresponding projection display area of the alignment glass based on the adjusted first change curve, and including.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0008] In a first aspect, embodiments of the present application provide a head-up display system. The head-up display system includes a combined glass and a projection assembly. The combined glass has at least one projection display area, and each projection display area has a wedge-shaped cross-sectional shape in which the thickness of the combined glass at the upper edge of the projection display area is greater than the thickness of the combined glass at the lower edge of the projection display area when the combined glass is attached to the vehicle, and has a segment in which the wedge angle continuously decreases from the lower edge to the upper edge. At any point position in the segment, there are a measured wedge angle and a plurality of theoretical wedge angle values of the reflection ghost. when there is no Fitting the measured wedge angles at the positions of each point in the segment to obtain an approximate curve of the actual wedge angle, and calculating a plurality of position limit points based on the plurality of theoretical wedge angle values at the positions of each point in the segment and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge of the combined glass. The plurality of position limit points are sequentially connected to form a preset area surrounded, and the approximate curve of the actual wedge angle has a continuous curve accommodated in the preset area. The projection assembly includes at least one projection light source capable of projecting onto at least one projection display area, and the projection light rays emitted from the projection light source are incident on the projection display area to form a projection image.

[0009] Fitting the plurality of theoretical wedge angle values at the positions of each point in the segment to obtain a first change curve, and the maximum deviation value between the approximate curve of the actual wedge angle and the first change curve is 0.15 mrad or less.

[0010] The wedge angle within the segment continuously and non-linearly decreases from the lower edge to the upper edge, and both the approximate curve of the actual wedge angle and the first change curve conform to a function of degree 1 to 4.

[0011] The head-up display system includes a first eye box, a second eye box, and a third eye box from low to high, and the projected image includes a first sub-projected image, a second sub-projected image, and a third sub-projected image from high to low. The preset area is a polygon, and the plurality of position limit points include a first position limit point, a second position limit point, a third position limit point, and a fourth position limit point. Connect the bottom point of the vertical bisector of the first eye box and the center point of the first sub-projected image to obtain a first connection line. The coordinate information of the first position limit point includes the distance from the intersection of the first connection line and the projection display area to the bottom edge of the combined glass, and the theoretical wedge angle value when observing the center point of the first sub-projected image at the bottom point of the vertical bisector of the first eye box without reflection ghost. Connect the apex of the vertical bisector of the second eye box and the upper left corner point of the second sub-projected image to obtain a second connection line. The coordinate information of the second position limit point includes the distance from the intersection of the second connection line and the projection display area to the bottom edge of the combined glass, and the theoretical wedge angle value when observing the upper left corner point of the second sub-projected image at the apex of the vertical bisector of the second eye box without reflection ghost. Connect the apex of the vertical bisector of the third eye box and the center point of the third sub-projected image to obtain a third connection line. The coordinate information of the third position limit point includes the distance from the intersection of the third connection line and the projection display area to the bottom edge of the combined glass, and the theoretical wedge angle value when observing the center point of the third sub-projected image at the apex of the vertical bisector of the third eye box without reflection ghost. Connect the bottom point of the vertical bisector of the second eyeglass case and the lower right corner point of the second sub-projected image to obtain a fourth connection line. The coordinate information of the fourth position limit point includes the distance from the intersection of the fourth connection line and the projection display area to the bottom edge of the combined glass, and the theoretical wedge angle value when observing the lower right corner point of the second sub-projected image at the bottom point of the vertical bisector of the second eyeglass case without reflection ghosts.

[0012] The plurality of position limit points further includes a fifth position limit point and a sixth position limit point. The preset area is formed by being surrounded by sequentially connecting the first position limit point, the fifth position limit point, the second position limit point, the third position limit point, the sixth position limit point, and the fourth position limit point. Connect the top point of the vertical bisector of the first eyeglass case and the center point of the first sub-projected image to obtain a fifth connection line. The coordinate information of the fifth position limit point includes the distance from the intersection of the fifth connection line and the projection display area to the bottom edge of the combined glass, and the theoretical wedge angle value when observing the center point of the first sub-projected image at the top point of the vertical bisector of the first eyeglass case without reflection ghosts. Connect the bottom point of the vertical bisector of the third eyeglass case and the center point of the third sub-projected image to obtain a sixth connection line. The coordinate information of the sixth position limit point includes the distance from the intersection of the sixth connection line and the projection display area to the bottom edge of the combined glass, and the theoretical wedge angle value when observing the center point of the third sub-projected image at the bottom point of the vertical bisector of the third eyeglass case without reflection ghosts.

[0013] Connect the first position limit point and the fourth position limit point to form a first position limit line segment, and connect the second position limit point and the third position limit point to form a second position limit line segment. The approximate curve of the actual wedge angle intersects the first position limit line segment and / or the approximate curve of the actual wedge angle intersects the second position limit line segment.

[0014] The approximate curve of the actual wedge angle passes through the seventh position limit point, and the seventh position limit point is the center of mass of the distribution in the coordinate system where the approximate curve of the actual wedge angle is located among multiple theoretical wedge angle values when there is no reflection ghost when observing the second sub-projection image at each point on the vertical bisector of the second eye box.

[0015] The approximate curve of the actual wedge angle passes through the eighth position limit point. Connect the midpoint of the vertical bisector of the second eye box and the center point of the second sub-projection image to obtain an eighth connection line. The coordinate information of the eighth position limit point includes the distance from the intersection of the eighth connection line and the projection display area to the bottom edge of the combined glass, and the theoretical wedge angle value when there is no reflection ghost when observing the center point of the second sub-projection image at the midpoint of the vertical bisector of the second eye box.

[0016] In the direction from the bottom edge to the top edge of the combined glass, the ratio of the length of the segment to the length of the projection display area is 70% or more.

[0017] At least one projection display area includes at least one first projection display area and at least one second projection display area. The projection light source is configured to project light rays onto the first projection display area to form a first projection image, and the virtual image distance of the first projection image is 7m to 100m. The projection light source is configured to project light rays onto the second projection display area to form a second projection image, and the virtual image distance of the second projection image is 1m to 6m.

[0018] 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 configured to project light rays onto the first projection display area, and the second projection light source is configured to project light rays onto the second projection display area.

[0019] In a second aspect, the embodiments of the present application further provide a design method for a head-up display system. The design method for the head-up display system is To provide a projection assembly and a combining glass, such that the projection light rays emitted from the projection assembly are incident on at least one projection display area of the combining glass. To design an armrest box surface located inside the vehicle based on the observer inside the vehicle. To design a virtual image surface based on the projection images observed by the observer inside the vehicle through each projection display area. Here, the armrest box surface includes a plurality of sub - armrest box surfaces arranged sequentially from low to high, and the virtual image surface correspondingly includes a plurality of sub - virtual image surfaces arranged sequentially from high to low. Each sub - virtual image surface corresponds to one sub - armrest box surface. To select an observation dot matrix on each sub - armrest box surface and a virtual image dot matrix on each sub - virtual image surface, wherein the connecting line between the points in the observation dot matrix and the points in the virtual image dot matrix passes through the corresponding projection display area, and the intersection point of the connecting line and the projection display area is the incident point. Based on the projection assembly, the combining glass, and the plurality of connecting lines, to calculate a plurality of theoretical wedge angle values of the combining glass when the projection image has no reflection ghost at the corresponding incident point. Based on 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 combining glass, to perform fitting to obtain a first change curve of the wedge angle with respect to the distance from the incident point to the bottom edge of the combining glass. Based on 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 combining glass, to calculate a plurality of position - limiting points, and sequentially connect the plurality of position - limiting points to form a closed shape enclosing a preset area. To adjust the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area. Based on the adjusted first change curve, to determine the wedge angle value in the corresponding projection display area of the combining glass.

[0020] The adjusted first change curve conforms to a function of degree 1 to 4 and has a continuous curve that continuously decreases non-linearly.

[0021] The eyeglass box surface includes a first sub-eyeglass box surface, a second sub-eyeglass box surface, and a third sub-eyeglass box surface that are sequentially arranged from low to high. Correspondingly, the virtual image surface includes a first sub-virtual image surface, a second sub-virtual image surface, and a third sub-virtual image surface that are sequentially arranged from high to low. The preset area is a polygon, and the plurality of position limit points include a first position limit point, a second position limit point, a third position limit point, and a fourth position limit point. Calculating the plurality of position limit points based on the plurality of theoretical wedge angle values and the distances from the incident points corresponding to each of the theoretical wedge angle values to the bottom edge of the alignment glass is Connect the bottom point of the perpendicular bisector of the first sub-eyeglass box surface and the center point of the first sub-virtual image surface to obtain a first connection line. The first connection line intersects the projection display area at a first incident point. Connect the apex of the perpendicular bisector of the second sub-eyeglass box surface and the upper left corner point of the second sub-virtual image surface to obtain a second connection line. The second connection line intersects the projection display area at a second incident point. Connect the apex of the perpendicular bisector of the third sub-eyeglass box surface and the center point of the third sub-virtual image surface to obtain a third connection line. The third connection line intersects the projection display area at a third incident point. Connect the bottom point of the perpendicular bisector of the second sub-eyeglass box surface and the lower right corner point of the second sub-virtual image surface to obtain a fourth connection line. The fourth connection line intersects the projection display area at a fourth incident point, and Based on the projection assembly, the alignment glass, the first connection line, the second connection line, the third connection line, and the fourth connection line, calculate a first position limit theoretical wedge angle value when there is no reflection ghost at the first incident point, a second position limit theoretical wedge angle value when there is no reflection ghost at the second incident point, a third position limit theoretical wedge angle value when there is no reflection ghost at the third incident point, and a fourth position limit theoretical wedge angle value when there is no reflection ghost at the fourth incident point. Obtaining a first position limit point based on a first position limit theory wedge angle value and the distance from the first incident point to the bottom edge of the bonding glass, obtaining a second position limit point based on a second position limit theory wedge angle value and the distance from the second incident point to the bottom edge of the bonding glass, obtaining a third position limit point based on a third position limit theory wedge angle value and the distance from the third incident point to the bottom edge of the bonding glass, and obtaining a fourth position limit point based on a fourth position limit theory wedge angle value and the distance from the fourth incident point to the bottom edge of the bonding glass, including.

[0022] After obtaining a first position limit point based on a first position limit theory wedge angle value and the distance from the first incident point to the bottom edge of the bonding glass, obtaining a second position limit point based on a second position limit theory wedge angle value and the distance from the second incident point to the bottom edge of the bonding glass, obtaining a third position limit point based on a third position limit theory wedge angle value and the distance from the third incident point to the bottom edge of the bonding glass, and obtaining a fourth position limit point based on a fourth position limit theory wedge angle value and the distance from the fourth incident point to the bottom edge of the bonding glass, calculating a plurality of position limit points based on a plurality of theory wedge angle values and the distances from the incident points corresponding to each theory wedge angle value to the bottom edge of the bonding glass is further Connecting the vertex of the perpendicular bisector of the first sub - box surface and the center point of the first sub - virtual image surface to obtain a fifth connection line, the fifth connection line and the projection display area intersect at a fifth incident point, connecting the bottom point of the perpendicular bisector of the third sub - box surface and the center point of the third sub - virtual image surface to obtain a sixth connection line, and the sixth connection line and the projection display area intersect at a sixth incident point, Calculating a fifth position limit theory wedge angle value when there is no reflection ghost at the fifth incident point and a sixth position limit theory wedge angle value when there is no reflection ghost at the sixth incident point based on the projection assembly, the bonding glass, the fifth connection line, and the sixth connection line, Obtaining a fifth position limit point based on a fifth wedge angle value of the position limit theory and the distance from the fifth incident point to the bottom edge of the alignment glass, and obtaining a sixth position limit point based on a sixth wedge angle value of the position limit theory and the distance from the sixth incident point to the bottom edge of the alignment glass, The vertices of the preset region further include a fifth position limit point and a sixth position limit point, and the preset region is formed by being surrounded by sequentially connecting a first position limit point, a fifth position limit point, a second position limit point, a third position limit point, a sixth position limit point, and a fourth position limit point.

[0023] The connecting line between the first position limit point and the fourth position limit point is the first position limit line segment, the connecting line between the second position limit point and the third position limit point is the second position limit line segment, and adjusting the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset region Adjusting 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 intersects the first position limit line segment and / or the adjusted first change curve intersects the second position limit line segment.

[0024] Calculating a plurality of position limit points based on a plurality of theoretical wedge angle values and the distances from the incident points corresponding to each of the theoretical wedge angle values to the bottom edge of the alignment glass Connecting an observation point on the perpendicular bisector of the second sub - image box surface and an image point on the second sub - virtual image surface to obtain a plurality of seventh connecting lines, and the plurality of seventh connecting lines intersect the projection display region to obtain a plurality of seventh incident points Calculating a plurality of seventh position limit theoretical wedge angle values when there is no reflection ghost at the plurality of seventh incident points based on the projection assembly, the alignment glass, and the plurality of seventh connecting lines Obtaining a scatter distribution based on the plurality of seventh position limit theoretical wedge angle values and the distances from the plurality of seventh incident points to the bottom edge of the alignment glass, calculating the center of mass of the scatter distribution, and obtaining a seventh position limit point. Adjusting the first change curve so that the adjusted first change curve has a continuous curve contained within a preset region is Adjusting the first change curve so that the adjusted first change curve has a continuous curve contained within a preset region, and the adjusted first change curve passes through the seventh position limit point.

[0025] Calculating a plurality of position limit points based on a plurality of theoretical wedge angle values and the distances from the incident points corresponding to each of the theoretical wedge angle values to the bottom edge of the alignment glass is Connecting the midpoint of the perpendicular bisector of the second sub - box surface and the center point of the second sub - virtual image surface to obtain an eighth connection line, and the eighth connection line intersects the projection display region to obtain an eighth incident point, Calculating an eighth position - limiting theoretical wedge angle value when there is no reflection ghost at the eighth incident point based on the projection assembly, the alignment glass, and the eighth connection line, Obtaining an eighth position limit point based on the eighth position - limiting theoretical wedge angle value and the distance from the eighth incident point to the bottom edge of the alignment glass, Adjusting the first change curve so that the adjusted first change curve has a continuous curve contained within a preset region is Adjusting the first change curve so that the adjusted first change curve has a continuous curve contained within a preset region, and the adjusted first change curve passes through the eighth position limit point.

[0026] The value of the ratio of the maximum local range ΔW of the plurality of theoretical wedge angle values to the overall range ΔC of the plurality of theoretical wedge angle values satisfies ΔW / ΔC≦0.9.

[0027] At least one projection display area includes at least two first projection display areas or at least two second projection display areas. After fitting to obtain at least two adjusted first change curves of the wedge angle associated with the distance from the incident point to the bottom edge of the alignment glass, when the maximum deviation value between two adjacent adjusted first change curves is greater than 0.15 mrad, based on the adjusted first change curve, after determining the wedge angle value in the corresponding projection display area of the alignment glass, the design method of the head-up display system further adjusting the distance between the eyebox plane and the virtual image plane corresponding to one of the two adjacent adjusted first change curves, recalculating a new plurality of theoretical wedge angle values, fitting based on 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 of the alignment glass to obtain a new first change curve of the wedge angle associated with the distance from the incident point to the bottom edge of the alignment glass, and calculating a new preset area, adjusting the new first change curve so that the adjusted new first change curve has a continuous curve accommodated in the new preset area, judging whether the maximum deviation value between the adjusted new first change curve and the other one of the two adjacent adjusted first change curves is less than or equal to 0.15 mrad, if it is determined to be no, repeating the above procedure, if it is determined to be yes, determining the wedge angle value in the corresponding first projection display area or second projection display area of the alignment glass based on the adjusted new first change curve.

[0028] At least one projection display area includes at least one first projection display area and at least one second projection display area. After fitting to obtain at least two adjusted first change curves of the wedge angle associated with the distance from the incident point to the bottom edge of the alignment glass, when the maximum deviation value between two adjacent adjusted first change curves is greater than 0.2 mrad, based on the adjusted first change curve, after determining the wedge angle value in the corresponding projection display area of the alignment glass, the design method of the head-up display system further adjusting the distance between the eyebox plane and the virtual image plane corresponding to one of the two adjacent adjusted first change curves, recalculating a new plurality of theoretical wedge angle values, Based on 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 of the alignment glass, fitting to obtain a new first change curve of the wedge angle associated with the distance from the incident point to the bottom edge of the alignment glass, and calculating a new preset area, adjusting the new first change curve so that the adjusted new first change curve has a continuous curve contained in the new preset area, determining whether the maximum deviation value between the adjusted new first change curve and the other one of the two adjacent adjusted first change curves is less than or equal to 0.2 mrad, if it is determined as no, repeating the above procedure, if it is determined as yes, determining the wedge angle value in the corresponding first projection display area or second projection display area of the alignment glass based on the adjusted new first change curve.

[0029] new The set of a plurality of theoretical wedge angle values has a maximum local range ΔWU, new The set of a plurality of theoretical wedge angle values has an overall range ΔCU, and the value of the ratio of ΔWU to ΔCU satisfies ΔWU / ΔCU ≦ 0.9.

[0030] In the description, claims, and drawings of this application, terms such as "first", "second", etc. are for distinguishing different objects and not for explaining a specific order. Also, the terms "comprising", "having", and any variations thereof are intended to cover and not exclude the inclusion of other components. For example, a process, method, system, product, or device comprising a series of operations or units is not limited to the listed operations or units, and can selectively include operations or units not listed, or can selectively include other operations or units specific to these processes, methods, products, or devices.

[0031] As used herein, "example" or "embodiment" means that a particular feature, structure, or characteristic described in connection with the example or embodiment can be included in at least one embodiment of this application. The use of such terms anywhere in the specification does not necessarily indicate the same embodiment, nor do they indicate independent or alternative embodiments that are mutually exclusive of other embodiments. One of ordinary skill in the art can explicitly or implicitly understand that the examples described herein can be combined with other examples.

[0032] Referring to FIGS. 1, 2, and 3, FIG. 1 is a schematic configuration diagram of a head-up display system according to an embodiment of the present application, FIG. 2 is a schematic diagram of the imaging of a projected image in the head-up display system according to the embodiment of FIG. 1, and FIG. 3 is an approximate curve of the actual wedge angle of the projection display area in the head-up display system according to the embodiment of FIG. 1. In this embodiment, the head-up display system 1 includes a combined glass 10 and a projection assembly 20. The combined glass 10 has at least one projection display area 11. Each projection display area 11 has a wedge-shaped cross-sectional shape in which the thickness of the combined glass 10 at the upper edge 112 of the projection display area 11 is greater than the thickness of the combined glass 10 at the lower edge 111 of the projection display area 11 when the combined glass 10 is attached to the vehicle, and has a segment 113 in which the wedge angle continuously decreases from the lower edge 111 to the upper edge 112. There are a measured wedge angle at any point position of the segment 113 and a plurality of theoretical wedge angle values of the reflection ghost when there is no There are. The measured wedge angles at the positions of each point in the segment 113 are fitted to obtain an approximate curve L0 of the actual wedge angle. A plurality of position limit points are calculated based on the plurality of theoretical wedge angle values at the positions of each point in the segment 113 and the distance from the incident point corresponding to each theoretical wedge angle value to the bottom edge 12 of the combined glass 10. The plurality of position limit points are sequentially connected to form a surrounded preset area. The approximate curve L0 of the actual wedge angle has a continuous curve accommodated in the preset area S0. The projection assembly 20 includes at least one projection light source 21 that can project onto at least one projection display area 11. The projection light emitted from the projection light source 21 is incident on the projection display area 11 to form a projection image 211.

[0033] In this embodiment, each projection display area 11 has segments 113 whose wedge angles continuously, non-linearly, and monotonically decrease from the lower edge 111 to the upper edge 112. As can be understood, in the projection display area 11, except for these segments 113, the wedge angles of the other segments 113 may be equal to 0, may be a constant wedge angle, may increase linearly / non-linearly, may decrease linearly / non-linearly, or may continuously decrease together with the wedge angles of these segments 113.

[0034] In this 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 includes a projection assembly 20. The image projected onto at least one projection display area 11 by the projection assembly 20 includes at least one of one or more types of HUD images, HUD images at one or more angles, and HUD images at one or more display distances. Thereby, the head-up display system 1 can display a plurality of pieces of information, and the richness of the image display of the head-up display system 1 is enhanced. At least one projection display area 11 is used to display a HUD image. Specifically, the plurality of projection display areas 11 can be used to set an Augmented Reality Head Up Display (AR-HUD) or a Windshield Head Up Display (W-HUD), etc.

[0035] In this embodiment, the projection assembly 20 includes at least one projection light source 21 that projects onto at least one projection display area 11. One projection light source 21 is arranged corresponding to one projection display area 11, or one projection light source 21 is arranged corresponding to a plurality of projection display areas 11. In one embodiment, the projection light rays emitted from the projection light source 21 are directly incident on the projection display area 11. In another embodiment, the projection light rays emitted from the projection assembly 20 are incident on the projection display area 11 through a reflection device.

[0036] In this embodiment, the wedge angle in at least one projection display area 11 of the laminated glass 10 is used to remove the reflection ghost when the light beam emitted from the projection assembly 20 is incident on at least one projection display area 11 to form a projection image 211. Specifically, the application of the laminated glass 10 to a vehicle will be taken as an example for explanation. When the projection assembly 20 projects the projection light beam for forming the projection image 211 onto the projection display area 11, since the laminated glass 10 has a certain thickness, with respect to the image formed by the projection light beam being reflected by the glass located inside the vehicle in the laminated glass 10 to the instrument box EB located in the driver's cab, the image formed by the projection light beam being reflected by the glass located outside the vehicle in the laminated glass 10 to the instrument box EB forms a reflection ghost (also called a secondary image). When there is a high-reflection medium layer in the laminated glass 10, for example, when there is a metal coating containing Ag, a modified polyethylene terephthalate (PET) having a high reflectivity, etc., reflections also occur and a plurality of reflection ghosts are formed. Therefore, it is necessary to set a certain wedge angle value in the projection display area 11 of the laminated glass 10. By overlapping the image formed by the projection light beam being reflected by the glass located inside the vehicle in the laminated glass 10 to the instrument box EB located in the driver's cab and the image formed by the projection light beam being reflected by the glass located outside the vehicle in the laminated glass 10 or by the high-reflection medium layer to the instrument box EB to remove the reflection ghost, the observer can view the projection image 211 without reflection ghost through the projection display area 11. Here, the instrument box EB refers to the eyes of the driver located in the driver's cab.

[0037] Since the light entering the instrument box EB after being reflected by different areas of the projection display area 11 of the projection image 211 has different angles, when the instrument box EB observes different areas of the projection display area 11 at the same position, it is necessary to set different wedge angle values for different areas of the projection display area 11 of the laminated glass 10 so that the ghost is small or even there is no ghost.

[0038] During the running of the vehicle, when the vehicle runs on a road surface with a varying gradient or an uneven surface, it will sway to a certain extent. As a result, the height of the instrument box EB relative to the ground changes dynamically during the running of the vehicle, and consequently, the intersection point between the projection light rays of the projected image 211 entering the instrument box EB and the projection display area 11 changes dynamically, generating an overall dynamic ghost. Also, in the actual manufacturing process of the windshield 10, the curve of the wedge angle of the wedge-shaped intermediate PVB film is not ideally smooth, and its local undulations also result in non-uniform distribution of the ghosts of the projected image 211. Consequently, when observing the projected image 211 dynamically at different positions of the instrument box EB, there are ghosts or enhanced ghosts in the projected image 211 observed through the projection display area 11 of the windshield 10, that is, local dynamic ghosts are formed. Therefore, when dynamically observing the projected image 211 at different positions of the instrument box EB, it is necessary to set different wedge angle values for different regions of the projection display area 11 of the windshield 10 so that the reflected ghosts are small or even there are no reflected ghosts.

[0039] In the related art, the change of the wedge angle in the projection display area of the windshield 10 is realized only by connecting several wedge angles by straight line segments or, based on this, forming a simple arc-shaped transition at the bending of the connected straight line segments. These cannot solve the ghost problem of the head-up display image in multiple regions in the projection display area 11, nor can they solve the dynamic ghost problem in the same region in the projection display area 11.

[0040] In the present embodiment (see FIG. 3), each of the projection display regions 11 has a wedge-shaped cross-sectional shape in which when the bonding glass 10 is attached to the vehicle, the thickness of the bonding glass 10 at the upper edge 112 of the projection display region 11 is greater than the thickness of the bonding glass 10 at the lower edge 111 of the projection display region 11, and the wedge angle continuously decreases from the lower edge 111 toward the upper edge 112. L0 in FIG. 3 is an actual approximate curve of the wedge angle associated with the distance to the bottom edge 12 of the bonding glass 10 in one projection display region 11 of the bonding glass 10. The wedge angle in each projection display region 11 of the bonding glass 10 continuously decreases in the direction from the lower edge 111 toward the upper edge 112, thereby reducing and even eliminating the ghost problem of the head-up display image in each projection display region 11.

[0041] Specifically, the approximate curve L0 of the actual wedge angle has a continuous curve contained in a preset region S0. Here, the preset region S0 is the common set of the scatter distribution region of a plurality of theoretical wedge angle values when there is no ghost when the iBox EB observes the center point of the projection image 211 at different heights, and the scatter distribution region of a plurality of theoretical wedge angle values when there is no ghost when the iBox EB observes the whole of the projection image 211 at a specific height. Therefore, the actual wedge angle value corresponding to the continuous curve contained in the preset region S0 of the approximate curve L0 of the actual wedge angle has a smaller deviation compared with the theoretical wedge angle value when there is no ghost when the iBox EB observes the center point of the projection image 211 at different heights and the theoretical wedge angle value when there is no ghost when the iBox EB observes the whole of the projection image 211 at a specific height. That is, when the iBox EB observes the center of the projection image 211 at different heights, there are few ghosts, and even no ghosts, and when the iBox EB observes the whole of the projection image 211 at a specific height, the ghosts are small, and even no ghosts. Usually, since the image information at the center point of the projection image 211 is relatively important information, by weakening and further removing the reflection ghost in the dynamic observation process of the center point of the projection image 211, the local dynamic ghost at the center point of the projection image 211 can be effectively weakened and further removed, and the influence of the overall dynamic ghost of the projection image 211 on information transmission can be reduced.

[0042] Compared with related technologies, an embodiment of the present application provides a head-up display system 1. The head-up display system 1 includes a laminated glass 10 and a projection assembly 20. The laminated glass 10 has a wedge-shaped cross-sectional shape in a projection display area 11, where the thickness at an upper edge 112 is greater than the thickness at a lower edge 111, and has segments 113 in which a wedge angle continuously, non-linearly, and monotonically decreases from the lower edge 111 toward the upper edge 112. By fitting the measured wedge angles at the positions of each point of the segment 113, an approximate curve L0 of the actual wedge angle is obtained, and the approximate curve L0 of the actual wedge angle has a continuous curve accommodated in a preset area S0. As a result, there is a tendency for the continuous curve to coincide with a connecting line of a plurality of theoretical wedge angle values for removing a reflection ghost of the center of the projection image 211 in the dynamically changing projection display area 11. Therefore, the ghost of the head-up display image obtained through the projection display area 11 can be weakened or even removed, the quality of the head-up display image projected onto the laminated glass 10 can be improved, and it is advantageous for a driver to dynamically observe the head-up display image during vehicle driving, and thus the driving safety and comfort can be improved. The head-up display system 1 provided in the present application can weaken or even remove the ghost when dynamically observing the head-up display image at multiple points.

[0043] Referring to FIGS. 1 and 3 again, in this embodiment, a plurality of theoretical wedge angle values at the positions of each point within the segment 113 are fitted to obtain a first change curve L10, and a maximum deviation value Δαmax between the approximate curve L0 of the actual wedge angle and the first change curve L10 is 0.15 mrad or less.

[0044] In this embodiment, the first change curve L10 is a curve obtained by fitting a plurality of theoretical wedge angle values when there is no reflection ghost when the glove box EB observes the projection image 211 at a specific position. Since the maximum deviation value Δαmax between the approximate curve L0 of the actual wedge angle and the first change curve L10 is 0.15 mrad or less, when the glove box EB observes the projection image 211 at a specific position, it is ensured that the reflection ghost is small and further that there is no reflection ghost. Also, when the glove box EB dynamically observes the center of the projection image 211, it is ensured that the reflection ghost is small and further that there is no reflection ghost.

[0045] Referring again to FIGS. 1 and 3, in this embodiment, the wedge angle within the segment 113 continuously and non-linearly decreases from the lower edge 111 toward the upper edge 112, and both the approximate curve L0 of the actual wedge angle and the first change curve L10 conform to a 1st to 4th order function.

[0046] In this embodiment, since both the approximate curve L0 of the actual wedge angle and the first change curve L10 conform to a 1st to 4th order function, the smoothness of each part of the approximate curve L0 of the actual wedge angle is ensured, thereby preventing the reflection ghost from being enhanced by a sudden change in the local wedge angle value.

[0047] Referring to FIGS. 4 and 5, FIG. 4 is a diagram showing dynamically observing a projection image in the head-up display system according to the embodiment of FIG. 1, and FIG. 5 is a schematic diagram showing an approximate curve of the actual wedge angle of the projection display area and a preset area in the head-up display system according to the embodiment of FIG. 4. In this 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. 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 position limit points include a first position limit point P1, a second position limit point P2, a third position limit point P3, and a fourth position limit point P4. A first connection line is obtained by connecting the bottom point of the vertical bisector of the first eye box EB_S and the center point of the first sub-projection image 2111. The coordinate information of the first position limit point P1 includes the distance from the intersection of the first connection line and the projection display area 11 to the bottom edge 12 of the combiner 10, and the theoretical wedge angle value when observing the center point of the first sub-projection image 2111 at the bottom point of the vertical bisector of the first eye box EB_S without reflection ghost. A second connection line is obtained by connecting the apex of the vertical bisector of the second eye box EB_M and the upper left corner point of the second sub-projection image 2112. The coordinate information of the second position limit point P2 includes the distance from the intersection of the second connection line and the projection display area 11 to the bottom edge 12 of the combiner 10, and the theoretical wedge angle value when observing the upper left corner point of the second sub-projection image 2112 at the apex of the vertical bisector of the second eye box EB_M without reflection ghost. A third connection line is obtained by connecting the apex of the vertical bisector of the third eye box EB_T and the center point of the third sub-projection image 2113. The coordinate information of the third position limit point P3 includes the distance from the intersection of the third connection line and the projection display area 11 to the bottom edge 12 of the combiner 10, and the theoretical wedge angle value when observing the center point of the third sub-projection image 2113 at the apex of the vertical bisector of the third eye box EB_T without reflection ghost.Connect the bottom point of the vertical bisector of the second eyeglass box EB_M and the bottom right corner point of the second sub-projected image 2112 to obtain a fourth connection line. The coordinate information of the fourth position limit point P4 includes the distance from the intersection of the fourth connection line and the projection display area 11 to the bottom edge 12 of the alignment glass 10, and the theoretical wedge angle value when there is no reflection ghost when observing the bottom right corner point of the second sub-projected image 2112 at the bottom point of the vertical bisector of the second eyeglass box EB_M.

[0048] In this embodiment, the first eyeglass box EB_S, the second eyeglass box EB_M, and the third eyeglass box EB_T indicate positions at different heights from the ground of the driver's eyes in the vehicle cab. Here, the second eyeglass box EB_M indicates the normal height of the driver's eyes when the vehicle is not swaying. When observing the projection image 211 through the projection display area 11 at different heights of the eyeglass box EB, the projection image 211 appears at different heights on the side away from the eyeglass box EB of the alignment glass 10. Specifically, the first eyeglass box EB_S observes the first sub-projected image 2111, the second eyeglass box EB_M observes the second sub-projected image 2112, and the third eyeglass box EB_T observes the third sub-projected image 2113.

[0049] In this embodiment, the preset area S0 is a quadrilateral, and the preset area S0 is formed by being surrounded by the sequential connection of the first position limit point P1, the second position limit point P2, the third position limit point P3, and the fourth position limit point P4. Specifically, the preset area S0 and the approximate curve L0 of the actual wedge angle are in the same coordinate system, the abscissa is the distance to the bottom edge 12 of the alignment glass 10, and the ordinate is the wedge angle value.

[0050] The abscissa of the first position limit point P1 is the distance from the intersection of the first connection line and the projection display area 11 to the bottom edge 12 of the alignment glass 10, and the ordinate is the theoretical wedge angle value when there is no reflection ghost when observing the center point of the first sub-projected image 2111 at the bottom point of the vertical bisector of the first eyeglass box EB_S.

[0051] According to the characteristics of projection imaging, in the first eye box EB_S, as the observation point for observing the center point of the first sub-projection image 2111 moves from the bottom point to the top point along the vertical bisector of the first eye box EB_S, the distance from the intersection point of the connecting line between the observation point and the center point of the first sub-projection image 2111 and the projection display area 11 to the bottom edge 12 of the combining glass 10 becomes larger and larger, and the theoretical wedge angle value for removing the reflection ghost becomes smaller and smaller. Therefore, in the coordinate system of the approximate curve L0 of the actual wedge angle, when observing the center point of the first sub-projection image 2111 with the vertical bisector of the first eye box EB_S, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed to the lower right of the first position limit point P1.

[0052] The abscissa of the second position limit point P2 is the distance from the intersection point of the second connecting line and the projection display area 11 to the bottom edge 12 of the combining glass 10, and the ordinate is the theoretical wedge angle value when there is no reflection ghost when observing the upper left corner point of the second sub-projection image 2112 at the apex of the vertical bisector of the second eye box EB_M.

[0053] According to the characteristics of projection imaging, in the second eye box EB_M, as the observation point for observing the upper left corner point of the second sub-projection image 2112 moves from the apex to the bottom point along the vertical bisector of the second eye box EB_M, the distance from the intersection point of the connecting line between the observation point and the upper left corner point of the second sub-projection image 2112 and the projection display area 11 to the bottom edge 12 of the combining glass 10 becomes smaller and smaller, and the theoretical wedge angle value for removing the reflection ghost becomes larger and larger. Therefore, in the coordinate system of the approximate curve L0 of the actual wedge angle, when observing the upper left corner point of the second sub-projection image 2112 with the vertical bisector of the second eye box EB_M, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed to the upper left of the second position limit point P2. When observing the center of the second sub-projection image 2112 with the vertical bisector of the second eye box EB_M, the scatter points of the theoretical wedge angle value when there is no reflection ghost are also distributed to the upper left of the second position limit point P2.

[0054] The abscissa of the third position limit point P3 is the distance from the intersection point of the third connection line and the projection display area 11 to the bottom edge 12 of the combined glass 10, and the ordinate is the theoretical wedge angle value when there is no reflection ghost when observing the center point of the third sub-projection image 2113 at the apex of the vertical bisector of the third eye box EB_T.

[0055] According to the characteristics of projection imaging, in the third eye box EB_T, as the observation point for observing the center point of the third sub-projection image 2113 moves from the apex of the vertical bisector of the third eye box EB_T towards the bottom point, the distance from the intersection point of the connection line between the observation point and the center point of the third sub-projection image 2113 and the projection display area 11 to the bottom edge 12 of the combined glass 10 becomes smaller and smaller, and the theoretical wedge angle value for removing the reflection ghost becomes larger and larger. Therefore, in the coordinate system of the approximate curve L0 of the actual wedge angle, when observing the center point of the third sub-projection image 2113 with the vertical bisector of the third eye box EB_T, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed above the left of the third position limit point P3.

[0056] The abscissa of the fourth position limit point P4 is the distance from the intersection point of the fourth connection line and the projection display area 11 to the bottom edge 12 of the combined glass 10, and the ordinate is the theoretical wedge angle value when there is no reflection ghost when observing the lower right corner point of the second sub-projection image 2112 at the bottom point of the vertical bisector of the second eye box EB_M.

[0057] According to the characteristics of projection imaging, in the second eye box EB_M, as the observation point for observing the lower right corner point of the second sub-projected image 2112 moves from the bottom point to the top point of the vertical bisector of the second eye box EB_M, the distance from the intersection of the connecting line between the observation point and the lower right corner point of the second sub-projected image 2112 and the projection display area 11 to the bottom edge 12 of the combiner glass 10 becomes larger and larger, and the theoretical wedge angle value for removing the reflection ghost becomes smaller and smaller. Therefore, in the coordinate system of the approximate curve L0 of the actual wedge angle, when observing the lower right corner point of the second sub-projected image 2112 with the vertical bisector of the second eye box EB_M, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed to the lower right of the fourth position limit point P4. Here, when observing the center of the second sub-projected image 2112 with the vertical bisector of the second eye box EB_M, the scatter points of the theoretical wedge angle value when there is no reflection ghost are also distributed to the lower right of the fourth position limit point P4.

[0058] Therefore, in the preset area S0 formed by sequentially connecting the first position limit point P1, the second position limit point P2, the third position limit point P3, and the fourth position limit point P4, when observing the center point of the projected image 211 from different points on the vertical bisector of the first eye box EB_S, from different points on the vertical bisector of the second eye box EB_M, and from different points on the vertical bisector of the third eye box EB_T, the distribution of a plurality of theoretical wedge angle values when there is no reflection ghost is included. Therefore, the deviation between the continuous curve accommodated in the preset area S0 of the approximate curve L0 of the actual wedge angle and the theoretical wedge angle value for removing the reflection ghost when dynamically observing the center point of the projected image 211 with the vertical bisector of the eye box EB is relatively small. That is, the setting of the wedge angle in the projection display area 11 can weaken and even remove the reflection ghost when dynamically observing the center point of the projected image 211.

[0059] Referring to FIGS. 4 and 6, FIG. 6 is a schematic diagram showing an approximate curve of the actual wedge angle and a preset area in the head-up display system according to the embodiment of FIG. 4 in another embodiment. In this embodiment, the plurality of position limit points further includes a fifth position limit point P5 and a sixth position limit point P6, and the preset area S0 is formed by being surrounded by the first position limit point P1, the fifth position limit point P5, the second position limit point P2, the third position limit point P3, the sixth position limit point P6, and the fourth position limit point P4 connected in sequence. Connect the vertex of the vertical bisector of the first eyebox EB_S and the center point of the first sub-projected image 2111 to obtain a fifth connection line. The coordinate information of the fifth position limit point P5 includes the distance from the intersection of the fifth connection line and the projection display area 11 to the bottom edge 12 of the combiner glass 10, and the theoretical wedge angle value when there is no reflection ghost when observing the center point of the first sub-projected image 2111 at the vertex of the vertical bisector of the first eyebox EB_S. Connect the bottom point of the vertical bisector of the third eyebox EB_T and the center point of the third sub-projected image 2113 to obtain a sixth connection line. The coordinate information of the sixth position limit point P6 includes the distance from the intersection of the sixth connection line and the projection display area 11 to the bottom edge 12 of the combiner glass 10, and the theoretical wedge angle value when there is no reflection ghost when observing the center point of the third sub-projected image 2113 at the bottom point of the vertical bisector of the third eyebox EB_T.

[0060] In this embodiment, the preset area S0 is hexagonal, and the preset area S0 is formed by being surrounded by the first position limit point P1, the fifth position limit point P5, the second position limit point P2, the third position limit point P3, the sixth position limit point P6, and the fourth position limit point P4 connected in sequence. Specifically, the preset area S0 and the approximate curve L0 of the actual wedge angle are in the same coordinate system, the abscissa is the distance from the bottom edge 12 of the combiner glass 10, and the ordinate is the wedge angle value.

[0061] The abscissa of the fifth position limit point P5 is the distance from the intersection of the fifth connection line and the projection display area 11 to the bottom edge 12 of the alignment glass 10, and the ordinate is the theoretical wedge angle value when there is no reflection ghost when observing the center point of the first sub-projection image 2111 at the vertex of the vertical bisector of the first eye box EB_S.

[0062] According to the characteristics of the projection imaging, in the first eye box EB_S, as the observation point for observing the center point of the first sub-projection image 2111 moves from the vertex of the vertical bisector of the first eye box EB_S to the bottom point, the distance from the intersection of the connection line between the observation point and the center point of the first sub-projection image 2111 and the projection display area 11 to the bottom edge 12 of the alignment glass 10 becomes smaller and smaller, and the theoretical wedge angle value for removing the reflection ghost becomes smaller and smaller. Therefore, in the coordinate system of the approximate curve L0 of the actual wedge angle, when observing the center point of the first sub-projection image 2111 with the vertical bisector of the first eye box EB_S, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed above the left of the fifth position limit point P5.

[0063] The abscissa of the sixth position limit point P6 is the distance from the intersection of the sixth connection line and the projection display area 11 to the bottom edge 12 of the alignment glass 10, and the ordinate is the theoretical wedge angle value when there is no reflection ghost when observing the center point of the third sub-projection image 2113 at the bottom point of the vertical bisector of the third eye box EB_T.

[0064] According to the characteristics of projection imaging, in the third eye box EB_T, as the observation point for observing the center point of the third sub-projected image 2113 moves from the bottom point to the top point of the vertical bisector of the third eye box EB_T, the distance from the intersection of the connecting line between the observation point and the center point of the third sub-projected image 2113 and the projection display area 11 to the bottom edge 12 of the combiner glass 10 becomes larger and larger, and the theoretical wedge angle value for removing the reflection ghost becomes smaller and smaller. Therefore, in the coordinate system of the approximate curve L0 of the actual wedge angle, when observing the center point of the third sub-projected image 2113 with the vertical bisector of the third eye box EB_T, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed to the lower right of the sixth position limit point P6.

[0065] Therefore, in the preset area S0 surrounded by sequentially connecting the first position limit point P1, the fifth position limit point P5, the second position limit point P2, the third position limit point P3, the sixth position limit point P6, and the fourth position limit point P4, when observing different areas of the projected image 211 from different points on the vertical bisector of the first eye box EB_S, from different points on the vertical bisector of the second eye box EB_M, and from different points on the vertical bisector of the third eye box EB_T, the distribution of a plurality of theoretical wedge angle values when there is no reflection ghost is more accurately included. Therefore, the deviation between the continuous curve accommodated in the preset area S0 of the approximate curve L0 of the actual wedge angle and the theoretical wedge angle value for removing the reflection ghost when dynamically observing different areas of the projected image 211 with the vertical bisector of the eye box is further reduced. That is, the setting of the wedge angle in the projection display area 11 can further weaken the ghost when dynamically observing different areas of the projected image 211 and can further remove it.

[0066] Referring to FIGS. 4 and 7, FIG. 7 is a schematic diagram showing an approximate curve of the actual wedge angle and a preset area in a head-up display system according to the embodiment of FIG. 4 in yet another embodiment. In this embodiment, the first position limit point P1 and the fourth position limit point P4 are connected to form a first position limit line segment P1 - P4, and the second position limit point P2 and the third position limit point P3 are connected to form a second position limit line segment P2 - P3. The approximate curve L0 of the actual wedge angle intersects the first position limit line segment P1 - P4, and / or the approximate curve L0 of the actual wedge angle intersects the second position limit line segment P2 - P3.

[0067] In this embodiment, when the approximate curve L0 of the actual wedge angle intersects the first position limit line segment P1 - P4, the approximate curve L0 of the actual wedge angle has a continuous curve accommodated in the preset area S0. At the same time, when observing the area approaching the bottom of the first sub-projected image 2111 from a part of the points on the vertical bisector of the first eye box EB_S and the segment of the approximate curve L0 of the actual wedge angle located on the left side of the first position limit line segment P1 - P4, the deviation value from the theoretical wedge angle value when there is no reflection ghost is reduced. Also, when observing the area approaching the bottom of the second sub-projected image 2112 from a part of the points on the vertical bisector of the second eye box EB_M and the segment of the approximate curve L0 of the actual wedge angle located on the left side of the first position limit line segment P1 - P4, the deviation value from the theoretical wedge angle value when there is no reflection ghost is also reduced.

[0068] In this embodiment, the approximate curve L0 of the actual wedge angle intersects the second position limiting line segment P2 - P3, so that the approximate curve L0 of the actual wedge angle has a continuous curve contained in the preset region S0. At the same time, when observing the region approaching the top of the second sub - projection image 2112 from a part of the points on the vertical bisector of the second i - box EB_M and the segment of the approximate curve L0 of the actual wedge angle located on the right side of the second position limiting line segment P2 - P3, the deviation value from the theoretical wedge angle value when there is no reflection ghost is reduced. Also, when observing the region approaching the top of the third sub - projection image 2113 from a part of the points on the vertical bisector of the third i - box EB_T and the segment of the approximate curve L0 of the actual wedge angle located on the right side of the second position limiting line segment P2 - P3, the deviation value from the theoretical wedge angle value when there is no reflection ghost is also reduced.

[0069] In addition, in this embodiment, when the human eye moves along the direction from the bottom point to the top point of the vertical bisector of the first i - box EB_S and observes the center point of the first sub - projection image 2111, if the theoretical wedge angle value obtained when there is no reflection ghost is distributed near the connection line between the first position limiting point P1 and the fifth position limiting point P5, preferably, the approximate curve L0 of the actual wedge angle extends close to the connection line between the first position limiting point P1 and the fifth position limiting point P5. Thereby, the reflection ghost when dynamically observing the central region of the first sub - projection image 2111 can be further weakened and even removed.

[0070] In addition, in this embodiment, when the human eye moves along the direction from the bottom point to the top point of the vertical bisector of the third i - box EB_T and observes the center point of the third sub - projection image 2113, if the theoretical wedge angle value obtained when there is no reflection ghost is distributed near the connection line between the third position limiting point P3 and the sixth position limiting point P6, preferably, the approximate curve L0 of the actual wedge angle extends close to the connection line between the sixth position limiting point P6 and the third position limiting point P3. Thereby, the reflection ghost when dynamically observing the central region of the third sub - projection image 2113 can be further weakened and even removed.

[0071] Referring to FIGS. 4 and 8, FIG. 8 is a schematic diagram showing an approximate curve of the actual wedge angle of the projection display area and a preset area in still another embodiment of the head-up display system according to the embodiment of FIG. 4. In this embodiment, the approximate curve L0 of the actual wedge angle passes through the seventh position limit point G. The seventh position limit point G is the center of mass of the distribution of a plurality of theoretical wedge angle values when there is no reflection ghost when observing the second sub-projection image 2112 at each point on the perpendicular bisector of the second eye box EB_M, in the coordinate system where the approximate curve L0 of the actual wedge angle is located.

[0072] In this embodiment, the approximate curve L0 of the actual wedge angle passes through the seventh position limit point G. The seventh position limit point G is the center of mass of the distribution of a plurality of theoretical wedge angle values when there is no reflection ghost when observing the second sub-projection image 2112 on the perpendicular bisector of the second eye box EB_M, in the coordinate system where the approximate curve L0 of the actual wedge angle is located, that is, the ghost is relatively small when observing the second sub-projection image 2112 on the perpendicular bisector of the second eye box EB_M. Since the second eye box EB_M is at the normal height of the driver's eyes in the driver's cab, it is ensured that the ghost is small when the driver dynamically observes the projection image 211 when the vehicle is slightly swaying or when the vehicle is not swaying.

[0073] Referring to FIGS. 4 and 9, FIG. 9 is a schematic diagram showing an approximate curve of the actual wedge angle of the projection display area and a preset area in still another embodiment of the head-up display system according to the embodiment of FIG. 4. In this embodiment, the approximate curve L0 of the actual wedge angle passes through the eighth position limit point P8. The midpoint of the perpendicular bisector of the second eye box EB_M and the center point of the second sub-projection image 2112 are connected to obtain an eighth connection line. The coordinate information of the eighth position limit point P8 includes the distance from the intersection of the eighth connection line and the projection display area 11 to the bottom edge 12 of the combiner glass 10, and the theoretical wedge angle when there is no reflection ghost when observing the center point of the second sub-projection image 2112 at the midpoint of the perpendicular bisector of the second eye box EB_M.

[0074] In this embodiment, in a vehicle, the position of the driver's eyes is usually at the midpoint of the vertical bisector of the second eye box EB_M. At the same time, information with a high importance level among the information displayed in the projection image 211 is usually displayed at the center of the projection image 211. Therefore, when the driver's eyes observe the center point of the second sub-projection image 2112 at the midpoint of the vertical bisector of the second eye box EB_M, it is important that there is no reflected ghost. Therefore, the fact that the approximate curve L0 of the actual wedge angle passes through the eighth position limit point P8 is advantageous for the driver to observe the projection image 211 at a normal position when driving the vehicle.

[0075] In order to significantly alleviate the dynamic ghost, the approximate curve L0 of the actual wedge angle preferably not only extends close to the connecting line between the first position limit point P1 and the fifth position limit point P5, but also extends close to the connecting line between the sixth position limit point P6 and the third position limit point P3, and passes through the seventh position limit point G or the eighth position limit point P8. Therefore, it is possible to avoid a local abrupt change in the approximate curve L0 of the actual wedge angle and realize that it is difficult to observe the dynamic ghost on any of the plurality of sub-eye box surfaces EB11.

[0076] Referring to FIG. 1 again, in this embodiment, in the direction from the bottom edge 12 to the upper edge 13 of the windshield 10, the ratio of the length of the segment 113 to the length of the projection display area 11 is 70% or more.

[0077] In this embodiment, in the direction from the bottom edge 12 to the upper edge 13 of the windshield 10, the ratio of the length d1 of the segment 113 to the length d2 of the projection display area 11 is 70% or more. Preferably, the ratio of the length of this segment 113 to the length of the projection display area 11 is 75% or more, or 80% or more, or 85% or more, or 90% or more, or 95% or more, or equal to 100%. Here, the length is obtained by measuring in the traveling direction from the lower edge 111 to the upper edge 112.

[0078] Referring to FIGS. 10 and 11, FIG. 10 is a schematic configuration diagram of a head-up display system according to still another embodiment of the present application, and FIG. 11 is a schematic diagram of the imaging of a projection in the head-up display system according to the embodiment of FIG. 10. In this embodiment, 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 configured to project a light beam onto 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 m to 100 m. The projection light source 21 is configured to project a light beam onto 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 m to 6 m.

[0079] In this embodiment, the first projection display area 114 is used for long-distance projection display. Specifically, the first projection display area 114 is used to fuse display information and a real scene, and is used to project and display complex graphics corresponding to objects in the real world to realize the interaction between the road condition-vehicle-driver. The second projection display area 115 is used for short-distance projection display. Specifically, the second projection display area 115 is used for the short-distance display of the parameter information of the vehicle operation, thereby reducing the need to lower the head to view the meter panel or related information, facilitating the driver's near and far switching of the eyes, reducing the need to lower the head to view the meter panel, maximizing the driver's attention during driving, and improving driving safety.

[0080] Referring to FIG. 12, FIG. 12 is a schematic configuration diagram of a head-up display system according to still another embodiment of the present application. In this 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 configured to project a light beam onto the first projection display area 114, and the second projection light source 213 is configured to project a light beam onto the second projection display area 115.

[0081] In this embodiment, the first projection light source 212 is used to project onto the first projection display area 114 to perform long-distance projection display. Specifically, the first projection display area 114 is used to display information fused with the real scene, and projects and displays complex figures corresponding to objects in the real world to realize the interaction between the road condition - vehicle - driver. The second projection light source 213 is used to project onto the second projection display area 115 to perform short-distance projection display. Specifically, the second projection display area 115 is used for short-distance display of the parameter information of vehicle operation, which can reduce the need to lower the head to view the meter panel or related information, facilitate the driver's focus adjustment between near and far vision, reduce the need to lower the head to view the meter panel, maximize the driver's attention during driving, and improve driving safety.

[0082] In the functional area through which signals of sensors such as cameras and lidars pass, a wedge-shaped intermediate adhesive layer can also be used to optimize the transmission ghost 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 inclination. Since the wedge angle in this area is a fixed value or adopts a change curve that satisfies a linear simple function, the production management control of the wedge angle can be facilitated.

[0083] The embodiment of the present application also provides a design method for the head-up display system 1. Referring to FIGS. 13, 14, and 15, FIG. 13 is a flowchart of the design method for the head-up display system according to an embodiment of the present application, FIG. 14 is a schematic diagram of the design method for the head-up display system according to the embodiment of FIG. 13, and FIG. 15 is a schematic diagram of the first change curve in the design method for the head-up display system according to the embodiment of FIG. 13. In this embodiment, the design method for the head-up display system 1 includes providing a projection assembly 20 and a collimating glass 10, such that the projection light rays emitted from the projection assembly 20 are incident on at least one projection display area 11 of the collimating glass 10, Designing the glove box surface EB10 located inside the vehicle based on the observer inside the vehicle, designing the virtual image surface TB10 based on the projected images 211 observed by the observer inside the vehicle through the respective projection display areas 11, Here, the glove box surface EB10 includes a plurality of sub - glove box surfaces EB11 arranged sequentially from low to high, and the virtual image surface TB10 correspondingly includes a plurality of sub - virtual image surfaces TB11 arranged sequentially from high to low. Each sub - virtual image surface TB11 corresponds to one sub - glove box surface EB11. Selecting the observation dot matrix EB111 on each sub - glove box surface EB11 and selecting the virtual image dot matrix TB111 on each sub - virtual image surface TB11, wherein the connecting line between the points in the observation dot matrix EB111 and the points in the virtual image dot matrix TB111 passes through the corresponding projection display area 11, and the intersection point of the connecting line and the projection display area 11 is the incident point, and selecting. Based on the projection assembly 20, the combined glass 10, and the plurality of connecting lines, calculating a plurality of theoretical wedge angle values of the combined glass 10 when the projected image 211 has no reflection ghost at the corresponding incident point. Based on 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 combined glass 10, fitting to obtain the first change curve L10 of the wedge angle with respect to the distance from the incident point to the bottom edge 12 of the combined glass 10. Based on 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 combined glass 10, calculating a plurality of position - limiting points, and sequentially connecting the plurality of position - limiting points to form a closed shape surrounding a preset area S0. Adjusting the first change curve L10 so that the adjusted first change curve L11 has a continuous curve accommodated in the preset area S0. Based on the adjusted first change curve L11, determining the wedge angle value in the corresponding projection display area 11 of the combined glass 10.

[0084] In this embodiment, the laminated glass 10 is used for the front glass of a vehicle and applied to the head-up display system 1 of the vehicle. The design method of the laminated glass 10 includes S10, S20, S30, S40, S50, S60, S70, S80 and S90. Hereinafter, S10, S20, S30, S40, S50, S60, S70, S80 and S90 will be described in detail.

[0085] S10, provide a projection assembly 20 and a laminated glass 10, and the projection light rays emitted from the projection assembly 20 are incident on at least one projection display area 11 of the laminated glass 10.

[0086] S20, design an instrument panel surface EB10 located inside the vehicle based on the observer inside the vehicle.

[0087] S30, design a virtual image surface TB10 based on the projection images 211 observed by the observer inside the vehicle through each projection display area 11.

[0088] In this embodiment, the instrument panel surface EB10 includes a plurality of sub-instrument panel surfaces EB11 arranged in sequence from low to high, the virtual image surface TB10 includes a plurality of sub-virtual image surfaces TB11 arranged in sequence from high to low, and each sub-virtual image surface TB11 corresponds to one sub-instrument panel surface EB11. Specifically, the instrument panel surface EB10 is used to simulate the plane where the eyes of the observer sitting in the driver's cab of the vehicle are located. The plurality of sub-instrument panel surfaces EB11 are used to simulate the eyes of the observer being at different heights, that is, the plurality of sub-instrument panel surfaces EB11 are used to simulate 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 when the projection light rays are reflected by the instrument panel surface EB10 on the laminated glass 10. A plurality of sub virtual image plane TB11 It is used to simulate a virtual image formed on the other side of the alignment glass 10 by reflecting projection light rays on a plurality of sub-eye box surfaces EB11 at different positions on the alignment glass 10. Specifically, the plurality of sub-eye box surfaces EB11 and the plurality of sub-virtual image surfaces TB11 exhibit a centrosymmetric relationship in terms of height correspondence. That is, the sub-eye box surface EB11 with the highest height corresponds to the sub-virtual image surface TB11 with the lowest height, and the sub-eye box surface EB11 with the lowest height corresponds to the sub-virtual image surface TB11 with the highest height.

[0089] S40. Select an observation dot matrix EB111 on each sub-eye box surface EB11, and select a virtual image dot matrix TB111 on each sub-virtual image surface TB11. The connecting line between a point in the observation dot matrix EB111 and a point in the virtual image dot matrix TB111 passes through the corresponding projection display area 11, and the intersection of the connecting line and the projection display area 11 is the incident point.

[0090] In this embodiment, each point of the observation dot matrix EB111 corresponds to a position simulating the observer's eye. Each point of the virtual image dot matrix TB111 corresponds to and simulates a virtual image formed on the virtual image surface TB10 by reflecting projection light rays at a certain point on the eye box surface EB10 on the alignment glass 10. Specifically, each point in the virtual image dot matrix TB111 corresponds to one or more points in the observation dot matrix EB111. That is, the observer can see virtual images at the same position on the virtual image surface TB10 at different positions on the eye box surface EB10. Also, the observer can see virtual images at different positions on the virtual image surface TB10 at the same position on the eye box surface EB10.

[0091] S50. Based on the projection assembly 20, the alignment glass 10, and the plurality of connecting lines, calculate a plurality of theoretical wedge angle values of the alignment glass 10 when the projection image 211 has no reflection ghost at the corresponding incident point.

[0092] In this embodiment, on the correspondingly provided sub - box surface EB11 and sub - virtual image surface TB11, the connecting lines formed by connecting each point of the observation dot matrix EB111 and each point of the virtual image dot matrix TB111 have intersections with the combining glass 10, and the intersections are the incident points. Calculate the theoretical wedge angle values of the incident points when the virtual images on the sub - virtual image surface TB11 seen by the observer at each point in the observation dot matrix EB111 do not have reflection ghosts. The number of incident points used in the simulation calculation is the same as the number of theoretical wedge angle values.

[0093] S60. Based on a plurality of theoretical wedge angle values and the distances from the incident points corresponding to each of the theoretical wedge angle values to the bottom edge 12 of the combining glass 10, perform fitting to obtain a first change curve L10 of the wedge angle with respect to the distance from the incident point to the bottom edge 12 of the combining glass 10.

[0094] In this embodiment, the plurality of theoretical wedge angle values and the distance from the incident point to the bottom edge 12 of the alignment glass 10 exhibit a discrete distribution. Specifically, in one embodiment, for each corresponding sub-eye box surface EB11 and sub-virtual image surface TB11, a sub-scatter diagram of one of the plurality of theoretical wedge angle values can be calculated, and the plurality of sub-scatter diagrams can be integrated into the same coordinate system to form a scatter diagram. The first change curve is obtained by performing function fitting on the scatter diagram of the plurality of theoretical wedge angle values. For example, the function may be, but is not limited to, a cubic, quartic, or quintic polynomial function, or a basic function such as an exponential function, a power function, or a logarithmic function, and a composite function composed of these. The data curve fitting process can be performed using software such as Microsoft Excel, WPS, MATLAB, or OriginPro. Since the observer can see a plurality of images at different distances or angles at a certain point on the alignment glass 10, there are a plurality of theoretical wedge angle values at this point. However, the wedge angle value at a certain point on the alignment glass 10 can only be one value. Also, along the direction from the bottom edge 12 to the upper edge 13 of the alignment glass 10, there are a plurality of theoretical wedge angle values at other points having the same distance as this point to the bottom edge 12, but it is suitable that the wedge angle value of the point on the alignment glass 10 having a certain distance to the bottom edge 12 is one value. Therefore, in order to reduce the ghost phenomenon, it is necessary to appropriately select the wedge angle value at each incident point on the alignment glass 10. By performing function fitting on the plurality of theoretical wedge angle values, the deviation between the wedge angle value in the projection display area 11 of the alignment glass 10 and the plurality of theoretical wedge angle values can be made smaller, the ghost phenomenon of the image projected in the projection display area 11 of the alignment glass 10 can be reduced, and the imaging quality of the alignment glass 10 can be improved. In another embodiment, for the plurality of theoretical wedge angle values at each incident point, the average value of the maximum value and the minimum value among the plurality of theoretical wedge angle values at this point is selected, and then the average value of the maximum value and the minimum value among the plurality of theoretical wedge angle values at each incident point is connected to form the first change curve L10.

[0095] S70. Calculate a plurality of position limit points based on a plurality of theoretical wedge angle values and the distances from the incident points corresponding to each of the theoretical wedge angle values to the bottom edge 12 of the alignment glass 10, and sequentially connect the plurality of position limit points to form a surrounding of a preset region S0.

[0096] In this embodiment, the preset region S0 is a scatter distribution region that accommodates the theoretical wedge angle values when observing the center point of the virtual image plane TB10 from different heights from the instrument panel surface EB10 and there is no reflection ghost.

[0097] S80. Adjust the first change curve L10 so that the adjusted first change curve L11 has a continuous curve accommodated in the preset region S0.

[0098] In this embodiment, in order to make the adjusted first change curve L11 have a continuous curve accommodated in the preset region S0, it can be adjusted by methods such as adjusting the picking points of the wedge angle values or the fitting function of the first change curve L10, but it is not limited thereto. The deviation between the actual wedge angle value corresponding to the continuous curve of the adjusted first change curve L11 accommodated in the preset region S0 and the theoretical wedge angle value when observing the center point of the projection image 211 from different heights of the instrument panel surface EB10 and there is no reflection ghost is small, that is, when observing the center of the projection image 211 from different heights of the instrument panel surface EB10, there are few or no reflection ghosts.

[0099] S90. Determine the wedge angle value in the corresponding projection display region 11 of the alignment glass 10 based on the adjusted first change curve L11.

[0100] In this embodiment, by determining the wedge angle value in the corresponding projection display area 11 of the combined glass 10 according to the adjusted first change curve L11, the ghost phenomenon when dynamically observing the imaging in the projection display area 11 of the combined glass 10 on the eyebox plane EB10 is weakened. Specifically, by selecting and designing the virtual image plane TB10, the distribution of a plurality of theoretical wedge angle values in the projection display area 11 of the combined glass 10 is calculated and fitted to obtain the adjusted first change curve L11 corresponding to the projection display area 11, and the wedge angle value in the corresponding projection display area 11 of the combined glass 10 can be determined.

[0101] In one embodiment, the first change curve L10 is adjusted and optimized. "Adjusting the first change curve L10 so that the adjusted first change curve L11 has a continuous curve accommodated in a preset area S0" includes adjusting the first change curve L10 so that the adjusted first change curve L11 has a continuous curve accommodated in a preset area.

[0102] Specifically, in this embodiment, the first change curve L10 is a curve obtained by fitting a plurality of theoretical wedge angle values when observing the projection image 211 at a specific position on the eyebox plane EB10 and having no reflection ghost. By having the adjusted first change curve L11 have a continuous curve accommodated in the preset area S0, when observing the projection image 211 at a specific position on the eyebox plane EB10, it is ensured that the reflection ghost is small or even absent, and when dynamically observing the center of the projection image 211 at different positions on the eyebox plane EB10, it is ensured that the reflection ghost is small or even absent.

[0103] In this embodiment, the adjusted first change curve L11 conforms to a 1 - 4th order function and has a continuous curve that continuously decreases non - linearly, thereby ensuring the smoothness of each part of the adjusted first change curve L11 and preventing the reflection ghost from being strengthened by a sudden change in the local wedge angle value.

[0104] Referring to FIG. 16, FIG. 16 is a design schematic diagram of the eyebox plane and the virtual image plane in the design method of the head-up display system according to the embodiment of FIG. 14. FIG. 17 is a schematic diagram of the adjusted first change curve in the design method of the head-up display system according to the embodiment of FIG. 16. In this embodiment, the eyebox plane EB10 includes a first sub-eyebox plane EB12, a second sub-eyebox plane EB13, and a third sub-eyebox plane EB14 arranged in sequence from low to high. Correspondingly, the virtual image plane TB10 includes a first sub-virtual image plane TB12, a second sub-virtual image plane TB13, and a third sub-virtual image plane TB14 arranged in sequence from high to low. The preset region S0 is polygonal, and the plurality of position limit points include a first position limit point P1, a second position limit point P2, a third position limit point P3, and a fourth position limit point P4. Calculating the plurality of position limit points based on the plurality of theoretical wedge angle values and the distances from the incident points corresponding to each of the theoretical wedge angle values to the bottom edge 12 of the combiner glass 10 is Connecting the bottom point of the perpendicular bisector of the first sub-eyebox plane EB12 and the center point of the first sub-virtual image plane TB12 to obtain a first connection line, the first connection line and the projection display area 11 intersect at a first incident point, connecting the apex of the perpendicular bisector of the second sub-eyebox plane EB13 and the upper left corner point of the second sub-virtual image plane TB13 to obtain a second connection line, the second connection line and the projection display area 11 intersect at a second incident point, connecting the apex of the perpendicular bisector of the third sub-eyebox plane EB14 and the center point of the third sub-virtual image plane TB14 to obtain a third connection line, the third connection line and the projection display area 11 intersect at a third incident point, connecting the bottom point of the perpendicular bisector of the second sub-eyebox plane EB13 and the lower right corner point of the second sub-virtual image plane TB13 to obtain a fourth connection line, and the fourth connection line and the projection display area 11 intersect at a fourth incident point, Based on the projection assembly 20, the alignment glass 10, the first connection line, the second connection line, the third connection line, and the fourth connection line, calculate the first position-limiting theoretical wedge angle value when there is no reflected ghost at the first incident point, the second position-limiting theoretical wedge angle value when there is no reflected ghost at the second incident point, the third position-limiting theoretical wedge angle value when there is no reflected ghost at the third incident point, and the fourth position-limiting theoretical wedge angle value when there is no reflected ghost at the fourth incident point, and Based on the first position-limiting theoretical wedge angle value and the distance from the first incident point to the bottom edge 12 of the alignment glass 10, obtain the first position-limiting point P1. Based on the second position-limiting theoretical wedge angle value and the distance from the second incident point to the bottom edge 12 of the alignment glass 10, obtain the second position-limiting point P2. Based on the third position-limiting theoretical wedge angle value and the distance from the third incident point to the bottom edge 12 of the alignment glass 10, obtain the third position-limiting point P3. Based on the fourth position-limiting theoretical wedge angle value and the distance from the fourth incident point to the bottom edge 12 of the alignment glass 10, obtain the fourth position-limiting point P4, including. The vertices of the preset region S0 include the first position-limiting point P1, the second position-limiting point P2, the third position-limiting point P3, and the fourth position-limiting point P4.

[0105] In this embodiment, since the dashboard surface EB10 has multiple positions depending on the height from the ground, the positions of different heights of the dashboard surface EB10 can be divided into the first sub-dashboard surface EB12 in the lowest region, the second sub-dashboard surface EB13 in the normal height region, and the third sub-dashboard surface EB14 in the highest region. Accordingly, the virtual image surface TB10 has a first sub-virtual image surface TB12 corresponding to the first sub-dashboard surface EB12, a second sub-virtual image surface TB13 corresponding to the second sub-dashboard surface EB13, and a third sub-virtual image surface TB14 corresponding to the third sub-dashboard surface EB14.

[0106] In this embodiment, a first sub-observation dot matrix EB121: m1*n1 is selected on the first sub-box surface EB12. Here, m1 satisfies m1≧1 and is a natural number, and n1 satisfies n1≧1 and is a natural number. For example, m1 may be 3, 5, 8, etc., but is not limited thereto. n1 may be 3, 5, 8, etc., but is not limited thereto. A second sub-observation dot matrix EB131: m2*n2 is selected on the second sub-box surface EB13. Here, m2 satisfies m2≧1 and is a natural number, and n2 satisfies n2≧1 and is a natural number. For example, m2 may be 3, 5, 8, etc., but is not limited thereto. n2 may be 3, 5, 8, etc., but is not limited thereto. m2 may be the same as or different from m1, and n2 may be the same as or different from n1. A third sub-observation dot matrix EB141: m3*n3 is selected on the third sub-box surface EB14. Here, m3 satisfies m3≧1 and is a natural number, and n3 satisfies n3≧1 and is a natural number. For example, m3 may be 3, 5, 8, etc., but is not limited thereto. n3 may be 3, 5, 8, etc., but is not limited thereto. m3 may be the same as or different from m1 and m2, and n3 may be the same as or different from n1 and n2.

[0107] In this embodiment, a first sub-virtual image dot matrix TB121:i1*j1 is selected on the first sub-virtual image plane TB12. Here, i1 satisfies i1≥1 and is a natural number, and j1 satisfies j1≥1 and is a natural number. For example, i1 may be 3, 5, 8, etc., but is not limited thereto. j1 may be 3, 5, 8, etc., but is not limited thereto. A second sub-virtual image dot matrix TB131:i2*j2 is selected on the second sub-virtual image plane TB13. Here, i2 satisfies i2≥1 and is a natural number, and j2 satisfies j2≥1 and is a natural number. For example, i2 may be 3, 5, 8, etc., but is not limited thereto. j2 may be 3, 5, 8, etc., but is not limited thereto. Here, i2 may be the same as or different from i1. j2 may be the same as or different from j1. A third sub-virtual image dot matrix TB141:i3*j3 is selected on the third sub-virtual image plane TB14. Here, i3 satisfies i3≥1 and is a natural number, and j3 satisfies j3≥1 and is a natural number. For example, i3 may be 3, 5, 8, etc., but is not limited thereto. j3 may be 3, 5, 8, etc., but is not limited thereto. i3 may be the same as or different from i1 and i2, and j3 may be the same as or different from j1 and j2. Note that i1*j1 may be the same as or different from m1*n1, i2*j2 may be the same as or different from m2*n2, and i3*j3 may be the same as or different from m3*n3.

[0108] Next, the calculation of the first position limit point P1, the second position limit point P2, the third position limit point P3, and the fourth position limit point P4 will be described in detail.

[0109] Connect the bottom point of the perpendicular bisector of the first sub - box surface EB12 and the center point of the first sub - virtual image surface TB12 to obtain a first connection line. The first connection line intersects the projection display area 11 at a first incident point. Connect the apex of the perpendicular bisector of the second sub - box surface EB13 and the upper - left - corner point of the second sub - virtual image surface TB13 to obtain a second connection line. The second connection line intersects the projection display area 11 at a second incident point. Connect the apex of the perpendicular bisector of the third sub - box surface EB14 and the center point of the third sub - virtual image surface TB14 to obtain a third connection line. The third connection line intersects the projection display area 11 at a third incident point. Connect the bottom point of the perpendicular bisector of the second sub - box surface EB13 and the lower - right - corner point of the second sub - virtual image surface TB13 to obtain a fourth connection line. The fourth connection line intersects the projection display area 11 at a fourth incident point.

[0110] Based on the projection assembly 20, the combining glass 10, the first connection line, the second connection line, the third connection line, and the fourth connection line, calculate the first position - limiting theoretical wedge angle value when there is no reflection ghost at the first incident point, the second position - limiting theoretical wedge angle value when there is no reflection ghost at the second incident point, the third position - limiting theoretical wedge angle value when there is no reflection ghost at the third incident point, and the fourth position - limiting theoretical wedge angle value when there is no reflection ghost at the fourth incident point.

[0111] Based on the first position - limiting theoretical wedge angle value and the distance from the first incident point to the bottom edge 12 of the combining glass 10, obtain a first position - limiting point P1. Based on the second position - limiting theoretical wedge angle value and the distance from the second incident point to the bottom edge 12 of the combining glass 10, obtain a second position - limiting point P2. Based on the third position - limiting theoretical wedge angle value and the distance from the third incident point to the bottom edge 12 of the combining glass 10, obtain a third position - limiting point P3. Based on the fourth position - limiting theoretical wedge angle value and the distance from the fourth incident point to the bottom edge 12 of the combining glass 10, obtain a fourth position - limiting point P4.

[0112] In this embodiment, the preset region S0 is quadrilateral, and the preset region S0 is formed by being surrounded by sequentially connecting a first position limit point P1, a second position limit point P2, a third position limit point P3, and a fourth position limit point P4. Specifically, the preset region S0 is in the same coordinate system as the adjusted first change curve L11, the abscissa is the distance to the bottom side 12 of the alignment glass 10, and the ordinate is the wedge angle value.

[0113] According to the characteristics of projection imaging, on the first sub-eye box surface EB12, as the observation point for observing the center point of the first sub-virtual image surface TB12 moves from the bottom point to the top point of the perpendicular bisector of the first sub-eye box surface EB12, the distance from the intersection of the connecting line between the observation point and the center point of the first sub-virtual image surface TB12 and the projection display area 11 to the bottom side 12 of the alignment glass 10 becomes larger and larger, and the theoretical wedge angle value for removing the reflection ghost becomes smaller and smaller. Therefore, in the coordinate system of the adjusted first change curve L11, when observing the center point of the first sub-virtual image surface TB12 with the perpendicular bisector of the first sub-eye box surface EB12, the scatter of the theoretical wedge angle value when there is no reflection ghost is distributed to the lower right of the first position limit point P1.

[0114] According to the characteristics of the projection imaging, on the second sub - image box surface EB13, as the observation point for observing the upper - left - hand corner point of the second sub - virtual image surface TB13 moves from the apex to the bottom point of the vertical bisector of the second sub - image box surface EB13, the distance from the intersection point of the connecting line between the observation point and the upper - left - hand corner point of the second sub - virtual image surface TB13 and the projection display area 11 to the bottom edge 12 of the adjustment glass 10 becomes smaller and smaller, and the theoretical wedge angle value for removing the reflection ghost becomes larger and larger. Therefore, in the coordinate system of the adjusted first change curve L11, when observing the upper - left - hand corner point of the second sub - virtual image surface TB13 on the vertical bisector of the second sub - image box surface EB13, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed above the left of the second position limit point P2. Here, when observing the center point of the second sub - virtual image surface TB13 on the vertical bisector of the second sub - image box surface EB13, the scatter points of the theoretical wedge angle value when there is no reflection ghost are also distributed above the left of the second position limit point P2.

[0115] According to the characteristics of the projection imaging, on the third sub - image box surface EB14, as the observation point for observing the center point of the third sub - virtual image surface TB14 moves from the apex to the bottom point of the vertical bisector of the third sub - image box surface EB14, the distance from the intersection point of the connecting line between the observation point and the center point of the third sub - virtual image surface TB14 and the projection display area 11 to the bottom edge 12 of the adjustment glass 10 becomes smaller and smaller, and the theoretical wedge angle value for removing the reflection ghost becomes larger and larger. Therefore, in the coordinate system of the adjusted first change curve L11, when observing the center point of the third sub - virtual image surface TB14 on the vertical bisector of the third sub - image box surface EB14, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed above the left of the third position limit point P3.

[0116] According to the characteristics of projection imaging, on the second sub - eye box surface EB13, as the observation point for observing the point at the lower right corner of the second sub - virtual image surface TB13 moves from the bottom point to the top point of the vertical bisector of the second sub - eye box surface EB13, the distance from the intersection of the connecting line between the observation point and the point at the lower right corner of the second sub - virtual image surface TB13 and the projection display area 11 to the bottom edge 12 of the combiner glass 10 becomes larger and larger, and the theoretical wedge angle value for removing the reflection ghost becomes smaller and smaller. Therefore, in the coordinate system of the adjusted first change curve L11, when observing the point at the lower right corner of the second sub - virtual image surface TB13 on the vertical bisector of the second sub - eye box surface EB13, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed to the lower right of the fourth position limit point P4. When observing the center point of the second sub - virtual image surface TB13 on the vertical bisector of the second sub - eye box surface EB13, the scatter points of the theoretical wedge angle value when there is no reflection ghost are also distributed to the lower right of the fourth position limit point P4.

[0117] Therefore, in the preset area S0 formed by sequentially connecting the first position limit point P1, the second position limit point P2, the third position limit point P3, and the fourth position limit point P4, there are included the distributions of a plurality of theoretical wedge angle values when there is no reflection ghost when observing the center point of the projection image 211 from different points on the vertical bisector of the first sub - eye box surface EB12, from different points on the vertical bisector of the second sub - eye box surface EB13, and from different points on the vertical bisector of the third sub - eye box surface EB14. Therefore, the deviation between the continuous curve of the actual wedge angle approximated curve L0 accommodated in the preset area S0 and the theoretical wedge angle value for removing the reflection ghost when dynamically observing the center point of the virtual image surface TB10 with the vertical bisector of the eye box surface EB10 is relatively small. That is, the setting of the wedge angle in the projection display area 11 can weaken and even remove the reflection ghost when dynamically observing the center point of the projection image 211.

[0118] Referring to FIG. 18, FIG. 18 is a schematic diagram of the first change curve after readjustment in the design method of the head-up display system according to the embodiment of FIG. 17. In this embodiment, after "obtaining the first position limit point P1 based on the first position limit theory wedge angle value and the distance from the first incident point to the bottom edge 12 of the collimating glass 10, obtaining the second position limit point P2 based on the second position limit theory wedge angle value and the distance from the second incident point to the bottom edge 12 of the collimating glass 10, obtaining the third position limit point P3 based on the third position limit theory wedge angle value and the distance from the third incident point to the bottom edge 12 of the collimating glass 10, and obtaining the fourth position limit point P4 based on the fourth position limit theory wedge angle value and the distance from the fourth incident point to the bottom edge 12 of the collimating glass 10", "calculating a plurality of position limit points based on the plurality of theoretical wedge angle values and the distances from the incident points corresponding to the respective theoretical wedge angle values to the bottom edge 12 of the collimating glass 10" further Connecting the vertex of the perpendicular bisector of the first sub-eye box surface EB12 and the center point of the first sub-virtual image surface TB12 to obtain a fifth connection line, the fifth connection line and the projection display area 11 intersect at a fifth incident point, connecting the bottom point of the perpendicular bisector of the third sub-eye box surface EB14 and the center point of the third sub-virtual image surface TB14 to obtain a sixth connection line, and the sixth connection line and the projection display area 11 intersect at a sixth incident point, Based on the projection assembly 20, the collimating glass 10, the fifth connection line, and the sixth connection line, calculating the fifth position limit theory wedge angle value when there is no reflection ghost at the fifth incident point and the sixth position limit theory wedge angle value when there is no reflection ghost at the sixth incident point, obtaining a fifth position limit point P5 based on the fifth position limit theory wedge angle value and the distance from the fifth incident point to the bottom edge 12 of the collimating glass 10, and obtaining a sixth position limit point P6 based on the sixth position limit theory wedge angle value and the distance from the sixth incident point to the bottom edge 12 of the collimating glass 10. The vertices of the preset region S0 further include a fifth position limit point P5 and a sixth position limit point P6, and the preset region S0 is formed by being surrounded by sequentially connecting a first position limit point P1, a fifth position limit point P5, a second position limit point P2, a third position limit point P3, a sixth position limit point P6, and a fourth position limit point P4.

[0119] Next, the calculation of the fifth position limit point P5 and the sixth position limit point P6 will be described in detail.

[0120] Connect the vertex of the perpendicular bisector of the first sub-ibox plane EB12 and the center point of the first sub-virtual image plane TB12 to obtain a fifth connection line. The fifth connection line and the projection display area 11 intersect at a fifth incident point. Connect the bottom point of the perpendicular bisector of the third sub-ibox plane EB14 and the center point of the third sub-virtual image plane TB14 to obtain a sixth connection line. The sixth connection line and the projection display area 11 intersect at a sixth incident point.

[0121] Based on the projection assembly 20, the combining glass 10, the fifth connection line, and the sixth connection line, calculate a fifth position limit wedge angle value when there is no reflection ghost at the fifth incident point and a sixth position limit wedge angle value when there is no reflection ghost at the sixth incident point.

[0122] Based on the fifth position limit wedge angle value and the distance from the fifth incident point to the bottom edge 12 of the combining glass 10, obtain the fifth position limit point P5. Based on the sixth position limit wedge angle value and the distance from the sixth incident point to the bottom edge 12 of the combining glass 10, obtain the sixth position limit point P6.

[0123] In this embodiment, the preset area S0 is hexagonal, and the preset area S0 is formed by sequentially connecting the first position limit point P1, the fifth position limit point P5, the second position limit point P2, the third position limit point P3, the sixth position limit point P6, and the fourth position limit point P4. Specifically, the preset area S0 is in the same coordinate system as the adjusted first change curve L11, the abscissa is the distance to the bottom side 12 of the alignment glass 10, and the ordinate is the wedge angle value.

[0124] According to the characteristics of projection imaging, on the first sub-eye box surface EB12, as the observation point for observing the center point of the first sub-virtual image surface TB12 moves from the apex to the bottom point of the vertical bisector of the first sub-eye box surface EB12, the distance from the intersection of the connection line between the observation point and the center point of the first sub-virtual image surface TB12 and the projection display area 11 to the bottom side 12 of the alignment glass 10 becomes smaller and smaller, and the theoretical wedge angle value for removing the reflection ghost becomes larger and larger. Therefore, in the coordinate system of the adjusted first change curve L11, when observing the center point of the first sub-virtual image surface TB12 on the vertical bisector of the first sub-eye box surface EB12, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed above and to the left of the fifth position limit point P5.

[0125] According to the characteristics of projection imaging, on the third sub-eye box surface EB14, as the observation point for observing the center point of the third sub-projection image 2113 moves from the bottom point to the apex of the vertical bisector of the third sub-eye box surface EB14, the distance from the intersection of the connection line between the observation point and the center point of the third sub-virtual image surface TB14 and the projection display area 11 to the bottom side 12 of the alignment glass 10 becomes larger and larger, and the theoretical wedge angle value for removing the reflection ghost becomes smaller and smaller. Therefore, in the coordinate system of the adjusted first change curve L11, when observing the center point of the third sub-virtual image surface TB14 on the vertical bisector of the third sub-eye box surface EB14, the scatter points of the theoretical wedge angle value when there is no reflection ghost are distributed below and to the right of the sixth position limit point P6.

[0126] Therefore, in a preset area S0 formed by sequentially connecting the first position limit point P1, the fifth position limit point P5, the second position limit point P2, the third position limit point P3, the sixth position limit point P6, and the fourth position limit point P4, from different points on the perpendicular bisector of the first sub-ibox surface EB12, from different points on the perpendicular bisector of the second sub-ibox surface EB13, and third sub - iBox plane EB14 from different points on the perpendicular bisector of virtual image plane TB10 when observing the center point of the virtual image surface TB10, the distribution of a plurality of theoretical wedge angle values when there is no reflection ghost is more accurately included. Therefore, the deviation between the continuous curve accommodated in the preset area S0 of the adjusted first change curve L11 and the theoretical wedge angle value for removing the reflection ghost when dynamically observing the center point of the virtual image surface TB10 with the perpendicular bisector of the ibox surface EB10 is further reduced. That is, the setting of the wedge angle in the projection display area 11

[0127] Referring to FIG. 19, FIG. 19 is a schematic diagram of the first change curve after readjustment in the design method of the head-up display system according to the embodiment of FIG. 18. In this embodiment, the connecting line between the first position limit point P1 and the fourth position limit point P4 is the first position limit line segment P1-P4, and the connecting line between the second position limit point P2 and the third position limit point P3 is the second position limit line segment P2-P3. "Adjust the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area S0" means adjusting the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area S0, and the adjusted first change curve intersects the first position limit line segment P1-P4, and / or the adjusted first change curve intersects the second position limit line segment P2-P3.

[0128] In this embodiment, the first change curve L10 is adjusted and optimized.

[0129] Specifically, the first change curve L10 is adjusted so that the adjusted first change curve L11 has a continuous curve accommodated in a preset region S0, and the adjusted first change curve L11 intersects the first position limiting line segment P1 - P4, and / or the adjusted first change curve L11 intersects the second position limiting line segment P2 - P3.

[0130] In this embodiment, by the adjusted first change curve L11 intersecting the first position limiting line segment P1 - P4, while the adjusted first change curve L11 has a continuous curve accommodated in the preset region S0, when observing the region approaching the bottom of the first sub - virtual image plane TB12 from a part of the points on the perpendicular bisector of the first sub - box surface EB12 and the segment of the adjusted first change curve L11 located on the left side of the first position limiting line segment P1 - P4, the deviation value from the theoretical wedge angle value when there is no reflection ghost is reduced. Also, when observing the region approaching the bottom of the second sub - virtual image plane TB13 from a part of the points on the perpendicular bisector of the second sub - box surface EB13 and the segment of the adjusted first change curve L11 located on the left side of the first position limiting line segment P1 - P4, the deviation value from the theoretical wedge angle value when there is no reflection ghost is also reduced.

[0131] In this embodiment, by the adjusted first change curve L11 intersecting the second position limiting line segment P2 - P3, while the adjusted first change curve L11 has a continuous curve accommodated in the preset region S0, when observing the region approaching the top of the second sub - virtual image plane TB13 from a part of the points on the perpendicular bisector of the second sub - box surface EB13 and the segment of the adjusted first change curve L11 located on the right side of the second position limiting line segment P2 - P3, the deviation value from the theoretical wedge angle value when there is no reflection ghost is reduced. Also, when observing the region approaching the bottom of the third sub - virtual image plane TB14 from a part of the points on the perpendicular bisector of the third sub - box surface EB14 and the segment of the adjusted first change curve L11 located on the right side of the second position limiting line segment P2 - P3, the deviation value from the theoretical wedge angle value when there is no reflection ghost is also reduced.

[0132] In addition, in the present embodiment, when a person's eye moves along the direction from the bottom point to the top point of the vertical bisector of the first sub-eye box surface EB12, the theoretical wedge angle value obtained by observing the center point of the first sub-virtual image surface TB12 when there is no reflection ghost is distributed near the connection line between the first position limit point P1 and the fifth position limit point P5. Preferably, the adjusted first change curve L11 extends close to the connection line between the first position limit point P1 and the fifth position limit point P5. Thereby, the reflection ghost when dynamically observing the central region of the first sub-virtual image surface TB12 can be further weakened, and even removed.

[0133] In addition, in the present embodiment, when a person's eye moves along the direction from the bottom point to the top point of the vertical bisector of the third sub-eye box surface EB14, the theoretical wedge angle value obtained by observing the center point of the third sub-virtual image surface TB14 when there is no reflection ghost is distributed near the connection line between the third position limit point P3 and the sixth position limit point P6. Preferably, the adjusted first change curve L11 extends close to the connection line between the sixth position limit point P6 and the third position limit point P3. Thereby, the reflection ghost when dynamically observing the central region of the third sub-virtual image surface TB14 can be further weakened, and even removed.

[0134] Referring to FIG. 20, FIG. 20 is a schematic diagram in which the adjusted first change curve in the design method of the head-up display system according to the embodiment of FIG. 19 passes through the seventh position limit point. In the present embodiment, "calculating a plurality of position limit points based on a plurality of theoretical wedge angle values and the distances from the incident points corresponding to the respective theoretical wedge angle values to the bottom edge 12 of the combining glass 10" means acquiring a plurality of seventh connection lines by connecting an observation point on the vertical bisector of the second sub-eye box surface EB13 and a virtual image point on the second sub-virtual image surface TB13, and the plurality of seventh connection lines intersect the projection display area 11 to obtain a plurality of seventh incident points, and Based on the projection assembly 20, the alignment glass 10, and the plurality of seventh connection lines, calculate the plurality of seventh position-limiting theoretical wedge angle values when there is no reflection ghost at the plurality of seventh incident points. Based on the plurality of seventh position-limiting theoretical wedge angle values and the distances from the plurality of seventh incident points to the bottom edge 12 of the alignment glass 10, obtain a scatter distribution, calculate the centroid of the scatter distribution, and obtain the seventh position-limiting point G. "Adjust the first change curve L10 so that the adjusted first change curve L11 has a continuous curve contained in the preset region S0" means adjusting the first change curve L10 so that the adjusted first change curve L11 has a continuous curve contained in the preset region S0, and the adjusted first change curve L11 passes through the seventh position-limiting point G.

[0135] Next, the calculation of the seventh position-limiting point G and the adjustment of the first change curve L10 will be described in detail.

[0136] Connect the observation points on the perpendicular bisector of the second sub-ibox surface EB13 and the virtual image points on the second sub-virtual image surface TB13 to obtain a plurality of seventh connection lines, and the plurality of seventh connection lines intersect the projection display area 11 to obtain a plurality of seventh incident points.

[0137] Based on the projection assembly 20, the alignment glass 10, and the plurality of seventh connection lines, calculate the plurality of seventh position-limiting theoretical wedge angle values when there is no reflection ghost at the plurality of seventh incident points.

[0138] Based on the plurality of seventh position-limiting theoretical wedge angle values and the distances from the plurality of seventh incident points to the bottom edge 12 of the alignment glass 10, obtain a scatter distribution, calculate the centroid of the scatter distribution, and obtain the seventh position-limiting point G.

[0139] Adjust the first change curve L10 so that the adjusted first change curve L11 has a continuous curve contained in the preset region S0, and the adjusted first change curve L11 passes through the seventh position-limiting point G.

[0140] In this embodiment, the adjusted first change curve L11 passes through the seventh position limit point G. The seventh position limit point G is the mass center of the distribution in the coordinate system where a plurality of theoretical wedge angle values are located when observing the second sub-virtual image plane TB13 with the perpendicular bisector of the second sub-box surface EB13, that is, when observing the second sub-virtual image plane TB13 on the perpendicular bisector of the second sub-box surface EB13, the ghost is relatively small. Since the second sub-box surface EB13 is at the normal height of the driver's eyes in the cab, it is ensured that when the vehicle is slightly swaying or not swaying, the ghost is small when the driver dynamically observes the projection image 211. adjusted first change curve L11

[0141] Referring to FIG. 21, FIG. 21 is a schematic diagram in which the adjusted first change curve in the design method of the head-up display system according to the embodiment of FIG. 19 passes through the 8 seventh position limit point. "Calculating a plurality of position limit points based on a plurality of theoretical wedge angle values and the distances from the incident points corresponding to each theoretical wedge angle value to the bottom edge 12 of the alignment glass 10" means connecting the midpoint of the perpendicular bisector of the second sub-box surface EB13 and the center point of the second sub-virtual image plane TB13 to obtain an eighth connection line, and the eighth connection line and the projection display area 11 intersect to obtain an eighth incident point, calculating an eighth position limit theoretical wedge angle value when there is no reflection ghost at the eighth incident point based on the projection assembly 20, the alignment glass 10, and the eighth connection line, and obtaining an eighth position limit point P8 based on the eighth position limit theoretical wedge angle value and the distance from the eighth incident point to the bottom edge 12 of the alignment glass 10. ​"Adjust the first change curve L10 such that the adjusted first change curve L11 has a continuous curve contained within a preset region S0" means adjusting the first change curve L10 such that the adjusted first change curve L11 has a continuous curve contained within a preset region S0, and that the adjusted first change curve L11 passes through the eighth position limit point P8.

[0142] Next, the calculation of the eighth position limit point P8 and the adjustment of the first change curve L10 will be described in detail.

[0143] Connect the midpoint of the perpendicular bisector of the second sub-eyebox plane EB13 and the center point of the second sub-virtual image plane TB13 to obtain an eighth connection line, and the eighth connection line intersects the projection display area 11 to obtain an eighth incident point.

[0144] Based on the projection assembly 20, the combined glass 10, and the eighth connection line, calculate the eighth position limit wedge angle value when there is no reflection ghost at the eighth incident point.

[0145] Obtain the eighth position limit point P8 based on the eighth position limit wedge angle value and the distance from the eighth incident point to the bottom edge 12 of the combined glass 10.

[0146] Adjust the first change curve L10 such that the adjusted first change curve L11 has a continuous curve contained within a preset region S0, and that the adjusted first change curve L11 passes through the eighth position limit point P8.

[0147] In this embodiment, the adjusted first change curve L11 passes through the eighth position limit point P8. In a vehicle, the position of the driver's eyes is usually at the center point of the second sub-eye box surface EB13. At the same time, information with a high importance level among the information displayed in the projection image 211 is usually displayed at the center point of the projection image 211, that is, the center point of the second sub-virtual image surface TB13. Therefore, when the driver's eyes observe the center point of the projection image 211 at the center point of the second sub-eye box surface EB13, it is important that there is no reflected ghost. Therefore, the fact that the adjusted first change curve L11 passes through the eighth position limit point P8 is advantageous for the driver to observe the projection image 211 at a normal position when driving the vehicle.

[0148] Referring to FIG. 15 again, in this embodiment, the value of the ratio of the maximum local range ΔW of a plurality of theoretical wedge angle values to the overall range ΔC of the plurality of theoretical wedge angle values satisfies ΔW / ΔC≤0.9.

[0149] By satisfying ΔW / ΔC≤0.9 for the value of the ratio of the maximum local range ΔW of a plurality of theoretical wedge angle values to the overall range ΔC of the plurality of theoretical wedge angle values, the discreteness of the plurality of theoretical wedge angle values can be made smaller, and consequently, the discreteness of the scatter diagram can be made smaller, increasing the smoothness of the approximate curve L0 of the actual wedge angle, that is, reducing the slope of the approximate curve L0 of the actual wedge angle. Thereby, the change rate of the wedge angle of the laminated glass 10 can be reduced, and the production difficulty of the laminated glass 10 can be reduced. Note that the maximum local range ΔW of the plurality of theoretical wedge angle values is the difference between the maximum value and the minimum value among the local ranges. The local range means the difference between the maximum value and the minimum value among the plurality of theoretical wedge angle values at a position where the distance to the bottom edge 12 of the laminated glass 10 is X. The overall range ΔC of the plurality of theoretical wedge angle values refers to the difference between the maximum value and the minimum value among all the theoretical wedge angle values.

[0150] Referring to FIG. 22, FIG. 22 is a schematic diagram after adjustment of two adjacent first change curves of the same type of projection display area in the design method of the head-up display system according to the embodiment of FIG. 13. In this embodiment, 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 by fitting, at least two adjusted first change curves L11 of the wedge angle associated with the distance from the incident point to the bottom edge 12 of the collimating glass 10 are obtained. When the maximum deviation value between two adjacent adjusted first change curves L11 is greater than 0.15 mrad, after "determining the wedge angle value in the corresponding projection display area 11 of the collimating glass 10 based on the adjusted first change curve L11", the design method of the head-up display system 1 further adjusting the distance between the eyebox plane EB10 and the virtual image plane TB10 corresponding to one of the two adjacent adjusted first change curves L11; recalculating a new plurality of theoretical wedge angle values; Based on 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 collimating glass 10, by fitting, a new first change curve L10 of the wedge angle associated with the distance from the incident point to the bottom edge 12 of the collimating glass 10 is obtained, and a new preset area S1 is calculated; adjusting 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; judging whether the maximum deviation value between the adjusted new first change curve L12 and the other one of the two adjacent adjusted first change curves L11 is 0.15 mrad or less; if it is determined as no, repeating the above procedure; if it is determined as yes, determining the wedge angle value in the corresponding first projection display area 114 or second projection display area 115 of the collimating glass 10 based on the adjusted new first change curve L12.

[0151] In this embodiment, when two adjacent adjusted first change curves L11 have an overlapping portion, the maximum deviation value is equal to the maximum value among the difference values of the two adjusted first change curves L11 in the overlapping portion. When two adjacent adjusted first change curves L11 do not have an overlapping portion, the maximum deviation value is equal to the difference between the wedge angles of the two closest ends of the two adjusted first change curves L11.

[0152] When the maximum deviation value is greater than 0.15 mrad, it is necessary to adjust the distance between the eyebox plane EB10 and the virtual image plane TB10 corresponding to any one of the two adjacent adjusted first change curves L11, whereby the maximum deviation value of the two designed adjusted first change curves L11 is adjusted to 0.15 mrad or less, or 0.10 mrad or less, or 0.08 mrad or less, or 0.05 mrad or less.

[0153] Specifically, after "determining the wedge angle value in the corresponding projection display area 11 of the alignment glass 10 based on the adjusted first change curve L11", it is necessary to adjust at least one of the two adjacent adjusted first change curves L11.

[0154] Adjust the distance between the eyebox plane EB10 and the virtual image plane TB10 corresponding to one of the two adjacent adjusted first change curves L11.

[0155] By adjusting the distance between the eyepiece box surface EB10 and the virtual image surface TB10 corresponding to one of two adjacent adjusted first change curves L11, the wedge angle value for removing the reflection ghost can be adjusted. Under the same conditions, the larger the distance between the eyepiece box surface EB10 and the virtual image surface TB10 corresponding to one of two adjacent adjusted first change curves L11, the smaller the wedge angle value for removing the reflection ghost. In this embodiment, in order to make two adjacent adjusted first change curves L11 closer to the design target, the distance between the virtual image surface TB10 corresponding to one adjusted first change curve L11 and the eyepiece box 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 eyepiece box surface EB10 can be decreased.

[0156] Recalculate a plurality of new theoretical wedge angle values.

[0157] In this embodiment, after adjusting the distance between the virtual image surface TB10 and the eyepiece box surface EB10, a new first change curve L10 obtained by fitting a plurality of theoretical wedge angle values calculated based on the calculation method of the foregoing embodiment is closer to the design target.

[0158] Based on a plurality of new 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 alignment glass 10, perform fitting to obtain a new first change curve L10 of the wedge angle associated with the distance from the incident point to the bottom edge 12 of the alignment glass 10, and calculate a new preset region S1.

[0159] 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 region S1.

[0160] Determine whether the maximum deviation value between the adjusted new first change curve L12 and the other one of two adjacent adjusted first change curves L11 is 0.15 mrad or less.

[0161] In this embodiment, adjusted new first change curve L12 it is determined whether the maximum deviation value from the other one of two adjacent adjusted first change curves L11 is 0.15 mrad or less. If it is determined as "no", the distance between the eyebox plane EB10 and the virtual image plane TB10 corresponding to one of two adjacent two adjusted first change curves L11 is repeatedly adjusted. If it is determined as "yes", the wedge angle value is selected.

[0162] Based on the newly adjusted first change curve L12, the wedge angle value in the corresponding first projection display area 114 or the second projection display area 115 of the alignment glass 10 is determined.

[0163] Referring to FIG. 23, FIG. 23 is a schematic diagram after adjustment of two adjacent first change curves of different projection display areas in the design method of the head-up display system according to the embodiment of FIG. 13. In this embodiment, 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, and by fitting, at least two adjusted first change curves L11 of the wedge angle associated with the distance from the incident point to the bottom edge 12 of the alignment glass 10 are obtained. When the maximum deviation value of two adjacent adjusted first change curves L11 is greater than 0.2 mrad, after "determining the wedge angle value in the corresponding projection display area 11 of the alignment glass 10 based on the adjusted first change curve L11", the design method of the head-up display system 1 further includes adjusting the distance between the eyebox plane EB10 and the virtual image plane TB10 corresponding to one of two adjacent adjusted first change curves L11, recalculating a new plurality of theoretical wedge angle values, and based on 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 alignment glass 10, by fitting, a new first change curve L10 of the wedge angle associated with the distance from the incident point to the bottom edge 12 of the alignment glass 10 is obtained, and a new preset area S1 is calculated. Adjust the new first change curve L10 so that the adjusted new first change curve L12 has a continuous curve contained in the new preset region S1, and Determine whether the maximum deviation value between the adjusted new first change curve and the other one of the two adjacent adjusted first change curves is 0.2 mrad or less. If it is determined to be no, repeat the above procedure. If it is determined to be yes, based on the adjusted new first change curve, determine the wedge angle value in the corresponding first projection display region 114 or the second projection display region 115 of the laminated glass 10. This includes.

[0164] In this embodiment, when two adjacent adjusted first change curves L11 have an overlapping portion, the maximum deviation value is equal to the maximum value among the difference values of the two adjusted first change curves L11 in the overlapping portion. When two adjacent adjusted first change curves L11 do not have an overlapping portion, the maximum deviation value is equal to the difference between the wedge angle values at the closest two ends of the two adjusted first change curves L11.

[0165] When the maximum deviation value is greater than 0.2 mrad, adjust the distance between the eye box plane EB10 and the virtual image plane TB10 corresponding to any one of the two adjacent adjusted first change curves L11 so that the maximum deviation value of the two designed adjusted first change curves L11 is adjusted to 0.2 mrad or less, or 0.15 mrad or less, or 0.10 mrad or less, or 0.08 mrad or less, or 0.05 mrad or less.

[0166] Specifically, after "determining the wedge angle value in the corresponding projection display region 11 of the laminated glass 10 based on the adjusted first change curve L11", it is necessary to adjust at least one of the two adjacent adjusted first change curves L11.

[0167] Adjust the distance between the eye box plane EB10 and the virtual image plane TB10 corresponding to one of the two adjacent adjusted first change curves L11.

[0168] By adjusting the distance between the eyepiece surface EB10 and the virtual image surface TB10 corresponding to one of two adjacent adjusted first change curves L11, the wedge angle value for removing reflection ghosts can be adjusted. Under the same conditions, the larger the distance between the eyepiece surface EB10 and the virtual image surface TB10 corresponding to one of two adjacent adjusted first change curves L11, the smaller the wedge angle value for removing reflection ghosts. In this embodiment, the distance between the virtual image surface TB10 corresponding to one adjusted first change curve L11 and the eyepiece surface EB10 is increased and / or the distance between the virtual image surface TB10 corresponding to the other adjusted first change curve L11 and the eyepiece surface EB10 is decreased so as to bring two adjacent adjusted first change curves L11 closer to the design target.

[0169] Recalculate a plurality of new theoretical wedge angle values.

[0170] In this embodiment, after adjusting the distance between the virtual image surface TB10 and the eyepiece surface EB10, a new first change curve L10 obtained by fitting a plurality of theoretical wedge angle values calculated based on the calculation method of the foregoing embodiment is closer to the design target.

[0171] Based on a plurality of new 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 alignment glass 10, perform fitting to obtain a new first change curve L10 of the wedge angle associated with the distance from the incident point to the bottom edge 12 of the alignment glass 10, and calculate a new preset region S1.

[0172] 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 region S1.

[0173] Determine whether the maximum deviation value between the newly adjusted first change curve L12 and the other one of the two adjacent adjusted first change curves L11 is 0.2 mrad or less.

[0174] In this embodiment, determine whether the maximum deviation value between the newly adjusted first change curve L12 and the other one of the two adjacent adjusted first change curves L11 is 0.2 mrad or less. If it is determined to be no, repeatedly adjust the distance between the eyebox plane EB10 and the virtual image plane TB10 corresponding to one of the two adjacent adjusted first change curves L11. If it is determined to be yes, select the wedge angle value.

[0175] Based on the newly adjusted first change curve L12, determine the wedge angle value in the corresponding first projection display area 114 or the second projection display area 115 of the combined glass 10.

[0176] Referring to FIG. 23 again, in this embodiment, new The set of a plurality of theoretical wedge angle values has a maximum local range ΔWU, new The set of a plurality of theoretical wedge angle values has an overall range ΔCU, and the value of the ratio of ΔWU to ΔCU satisfies ΔWU / ΔCU≦0.9.

[0177] In this embodiment, corresponding to the first projection display area 114 new The set of a plurality of theoretical wedge angle values and corresponding to the second projection display area 115 new The set of multiple theoretical wedge angles has a maximum local range ΔWU and an overall range ΔCU, and the value of the ratio of ΔWU to ΔCU satisfies ΔWU / ΔCU ≤ 0.9. By doing so, the overall discreteness of the multiple theoretical wedge angles can be made smaller, the smoothness of the adjusted first change curve L11 and the adjusted new first change curve L12 can be increased, that is, the overall slope of the adjusted first change curve L11 and the adjusted new first change curve L12 can be decreased. As a result, the overall wedge angle change rate of the laminated glass 10 can be reduced, and the production difficulty of the laminated glass 10 can be decreased. Note that the maximum local range ΔWU of the set of multiple theoretical wedge angles refers to the maximum value among the local ranges of the set. The local range of the set is the difference between the maximum value and the minimum value among the set of multiple theoretical wedge angles at a position where the distance to the bottom edge 12 of the laminated glass 10 is X. The overall range ΔCU of the set of multiple theoretical wedge angles refers to the difference between the maximum value and the minimum value in the set of all theoretical wedge angles.

[0178] Referring to FIGS. 24, 25, and 26, FIG. 24 is a design schematic diagram of an observation dot matrix and a virtual image dot matrix in a design method of a head-up display system according to an embodiment of the present application. FIG. 25 is a scatter diagram of theoretical wedge angle values when there is no ghost when observing a second sub-virtual image plane along the vertical bisector of the second sub-eye box plane in the design method of the head-up display system according to the embodiment of FIG. 24. FIG. 26 is a scatter diagram of theoretical wedge angle values when there is no ghost when observing three sub-virtual image planes from the vertical bisectors of three sub-eye box planes in the design method of the head-up display system according to the embodiment of FIG. 24.

[0179] In one embodiment of the present application, it is exemplified that at least one projection display area 11 includes one first projection display area 114 and one second projection display area 115. The first projection display area 114 corresponds to an AR-HUD, and the projection display distance is 10000 mm. The second projection display area 115 corresponds to a W-HUD, and the projection display distance is 3200 mm.

[0180] The laminated glass 10 includes a first transparent substrate, an intermediate adhesive layer, and a second transparent substrate. The maximum thickness of the first transparent substrate is 1.8 mm, the maximum thickness of the intermediate adhesive layer is 0.76 mm, and the maximum thickness of the second transparent substrate is 1.8 mm. The attachment angle when the laminated glass 10 is attached to the front glass of a vehicle is 27°.

[0181] The longitudinal curvature of the first projection display area 114 and the second projection display area 115 The radius R is 5 400 mm ~5 is 400 mm, and the lateral curvature The radius R is 2 500 mm ~2 is 550 mm.

[0182] The size of the instrument panel surface EB10 is 120 mm * 50 mm. The center of the first sub-instrument panel surface EB12 is 40 mm lower than the center of the second sub-instrument panel surface EB13, and the center of the third sub-instrument panel surface EB14 is 40 mm higher than the center of the second sub-instrument panel surface EB13.

[0183] For the first projection display area 114, the corresponding look-down angle of the first sub-instrument panel surface EB12 is -1°, the corresponding look-down angle of the second sub-instrument panel surface EB13 is -2.6°, and the corresponding look-down angle of the third sub-instrument panel surface EB14 is -4.2°. The corresponding look-over angles of the first sub-instrument panel surface EB12, the second sub-instrument panel surface EB13, and the third sub-instrument panel surface EB14 are all 0°, and the viewing angle is 10 ° ×4°. The distance from the midpoint of the second sub-instrument panel surface EB13 to the intersection of the main optical 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 incident angle of the first projection light source 212 is 68°.

[0184] For the second projection display area 115, the corresponding downward viewing angle of the first sub - eye box surface EB12 is - 3.9°, the corresponding downward viewing angle of the second sub - eye box surface EB13 is - 5.5°, and the corresponding downward viewing angle of the third sub - eye box surface EB14 is - 7.3°. The corresponding horizontal viewing angles of the first sub - eye box surface EB12, the second sub - eye box surface EB13, and the third sub - eye box surface EB14 are all 0°, and the viewing angle is 7 ° ×2°. The distance from the mid - point of the second sub - eye box surface EB13 to the intersection point of the main optical axis of the second projection light source 213 and the surface of the collimating glass 10 closer to the vehicle interior is 933 mm, and the incident angle of the first projection light source 212 is 66°.

[0185] The observation dot matrix EB111 m*n on the first sub - eye box surface EB12, the second sub - eye box surface EB13, and the third sub - eye box surface EB14 is a 5*3 dot matrix (see Figure 24). The virtual image dot matrices TB111 i*j on the two sets of the first sub - virtual image surface TB12, the second sub - virtual image surface TB13, and the third sub - virtual image surface TB14 are 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 removing ghosts for the first projection display area 114 and the second projection display area 115 are calculated sequentially and created as a scatter diagram. Taking the scatter diagram created based on the fact that the points on the vertical bisector of the second sub - eye box surface EB13 correspond to the points on the second sub - virtual image surface TB13 as an example (see Figure 25), in Figure 25, EB_Rm corresponds to the points on the vertical bisector of the second sub - eye box surface EB13, RiCj represents the points on the second sub - virtual image surface TB13, and the combination of EB_Rm and RiCj is the point EB_Rm Represents the theoretical wedge angle value when observing point RiCj and there is no ghost. Here, m = 1, 2, 3, 4, 5. i = 1, 2, 3, 4, 5, and j = 1, 2, 3. Also, when observing the first sub-image plane TB12 from the perpendicular bisector of the first sub-eye box plane EB12, the scatter distribution rule of the theoretical wedge angle value when there is no ghost, and when observing the third sub-image plane TB14 from the third sub-eye box plane EB14, the scatter distribution rule of the theoretical wedge angle value when there is no ghost is the same as that in FIG. 25, and the scatter distribution as shown in FIG. 26 can be calculated. Also, when observing the virtual image plane TB10 at a point on a line parallel to the perpendicular bisector on the eye box plane EB10, the scatter distribution rule of the theoretical wedge angle value when there is no ghost is almost the same as that in FIG. 26, and the scatter distribution can be calculated. Finally, 1350 theoretical wedge angle values can be calculated, the maximum value is 0.602 mrad, and correspondingly, the distance to the bottom edge 12 of the adjustment glass 10 is 289.3 mm. The minimum value is 0.14 mrad, and correspondingly, the distance to the bottom edge 12 of the adjustment glass 10 is 615.5 mm. Also, the overall range ΔCU of the 1350 theoretical wedge angle values is 0.462 mrad.

[0186] Calculated according to the design method of the head-up display system 1, first projection display area 114 For removing ghosts, the first position limit point P1(AR), the second position limit point P2(AR), the third position limit point P3(AR), the fourth position limit point P4(AR), the fifth position limit point P5(AR), the sixth position limit point P6(AR), and the seventh position limit point G(AR) can be calculated. Specifically, it is as shown in the following table.

[0187]

Table 1

[0188] Calculated according to the design method of the head-up display system 1, second projection display area 115For the [object], the first position limit point P1(W), the second position limit point P2(W), the third position limit point P3(W), the fourth position limit point P4(W), the fifth position limit point P5(W), the sixth position limit point P6(W) and the seventh position limit point G(W) for removing ghosts can be calculated. Specifically, it is as shown in the following table.

[0189]

Table 2

[0190] Fitting function Y = -6.811248E-09X 3 +1.276708E-05X 2 Fitting and adjusting according to -8.413138E-03X + 2.138185 to obtain the adjusted first change curve L11, where X = 288~740mm and Y = 0.61~0.14mrad. The adjusted first change curve L11 passes through the 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) respectively, and crosses P1(W)-P4(W) and P2(AR)-P3(AR). Also, since ΔWU≒0.24mrad and ΔWU / ΔCU≒0.52, in the first projection display area 114 and the second projection display area 115, by selecting the wedge angle value according to the adjusted first change curve L11, the dynamic ghost can be significantly alleviated.

[0191] As can be understood, the embodiments and drawings of the present application illustrate a head-up display system in which the projection display area is located on the left side and a design method of the head-up display system. However, the present application is not limited thereto, and the present application can also be applied to a head-up display system in which the projection display area is located on the right side and a design method of the head-up display system.

[0192] The above embodiments of the present application have been shown and described. However, the above embodiments are illustrative and should not be construed as limiting the present application. A person skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application. These improvements and refinements should also belong to the protection scope of the present application.

Explanation of Reference Signs

[0193] 1... Head-up display system, 10... Alignment glass, 20... Projection assembly, 11... Projection display area, 12... Bottom edge, 13... Top edge, 21... Projection light source, 111... Lower edge, 112... Upper edge, 113... Segment, 114... First projection display area, 115... Second projection display area, 211... Projection image, 212... First projection light source, 213... Second projection light source, 2111... First sub-projection image, 2112... Second sub-projection image, 2113... Third sub-projection image, 2121... First projection image, 2131... Second projection image, L0... Approximation curve of the actual wedge angle, L10... First change curve, L11... Adjusted first change curve, L12... Adjusted new first change curve, EB... Eyebox, EB_S... First eyebox, EB_M... Second eyebox, EB_T... Third eyebox, S0... Predetermined area, S1... New predetermined area, P1... First position limit point, P2... Second position limit point, P3... Third position limit point, P4... Fourth position limit point, P5... Fifth position limit point, P6... Sixth position limit point, G... Seventh position limit point, P8... Eighth position limit point, P1 - P4... First position limit line segment, P2 - P3... Second position limit line segment, EB10... Eyebox surface, EB11... Sub-eyebox surface, EB12... First sub-eyebox surface, EB13... Second sub-eyebox surface, EB14... Third sub-eyebox surface, EB111... Observation dot matrix, EB121... First sub-observation dot matrix, EB131... Second sub-observation dot matrix, EB141... Third sub-observation dot matrix, TB10... Virtual image plane, TB11... Sub-virtual image plane, TB12... First sub-virtual image plane, TB13... Second sub-virtual image plane, TB14... Third sub-virtual image plane, TB111... Virtual image dot matrix, TB121... First sub-virtual image dot matrix, TB131... Second sub-virtual image dot matrix, TB141... Third sub-virtual image dot matrix.

Claims

Claim 1 A head-up display system comprising: a laminated glass and a projection assembly, wherein the laminated glass has at least one projection display area, and each of the projection display areas has a wedge-shaped cross-sectional shape in which the thickness of the laminated glass at the upper edge of the projection display area is greater than the thickness of the laminated glass at the lower edge of the projection display area when the laminated glass is attached to a vehicle, and has a segment in which the wedge angle continuously decreases from the lower edge to the upper edge, and there is a measured wedge angle at any point in the segment and a plurality of theoretical wedge angle values for removing reflection ghosts, fitting the measured wedge angles at the positions of each point in the segment to obtain an approximate curve of the actual wedge angle, calculating a plurality of position limit points based on the plurality of theoretical wedge angle values at the positions of each point in the segment and the distance from the incident point corresponding to each of the theoretical wedge angle values to the bottom edge of the laminated glass, and the plurality of position limit points are sequentially connected to form a surrounded preset area, and the approximate curve of the actual wedge angle has a continuous curve accommodated in the preset area, the projection assembly includes at least one projection light source capable of projecting onto the at least one projection display area, and projection light emitted from the projection light source is incident on the projection display area to form a projection image, A head-up display system characterized by the above. Claim 2 Fitting the plurality of theoretical wedge angle values at the positions of each point in the segment to obtain a first change curve, and the maximum deviation value between the approximate curve of the actual wedge angle and the first change curve is 0.15 mrad or less. The head-up display system according to claim 1, characterized by the above. Claim 3 The wedge angle in the segment continuously and non-linearly decreases from the lower edge to the upper edge, and both the approximate curve of the actual wedge angle and the first change curve conform to a first to fourth order function. The head-up display system according to claim 2, characterized by the above. Claim 4 The head-up display system includes a first eye box, a second eye box, and a third eye box from low to high, and the projection image includes 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 position limit points include a first position limit point, a second position limit point, a third position limit point, and a fourth position limit point. Connect the bottom point of the vertical bisector of the first mailbox and the center point of the first sub-projection image to obtain a first connection line. The coordinate information of the first position limit point includes the distance from the intersection of the first connection line and the projection display area to the bottom edge of the alignment glass, and the theoretical wedge angle value when observing the center point of the first sub-projection image at the bottom point of the vertical bisector of the first mailbox without reflection ghosts. Connect the top point of the vertical bisector of the second mailbox and the upper left corner point of the second sub-projection image to obtain a second connection line. The coordinate information of the second position limit point includes the distance from the intersection of the second connection line and the projection display area to the bottom edge of the alignment glass, and the theoretical wedge angle value when observing the upper left corner point of the second sub-projection image at the top point of the vertical bisector of the second mailbox without reflection ghosts. Connect the top point of the vertical bisector of the third mailbox and the center point of the third sub-projection image to obtain a third connection line. The coordinate information of the third position limit point includes the distance from the intersection of the third connection line and the projection display area to the bottom edge of the alignment glass, and the theoretical wedge angle value when observing the center point of the third sub-projection image at the top point of the vertical bisector of the third mailbox without reflection ghosts. Connect the bottom point of the vertical bisector of the second mailbox and the lower right corner point of the second sub-projection image to obtain a fourth connection line. The coordinate information of the fourth position limit point includes the distance from the intersection of the fourth connection line and the projection display area to the bottom edge of the alignment glass, and the theoretical wedge angle value when observing the lower right corner point of the second sub-projection image at the bottom point of the vertical bisector of the second mailbox without reflection ghosts. The head-up display system according to claim 1, characterized in that.

5. The plurality of position limit points further include a fifth position limit point and a sixth position limit point, and the preset area is surrounded and formed by sequentially connecting the first position limit point, the fifth position limit point, the second position limit point, the third position limit point, the sixth position limit point, and the fourth position limit point. Connect the vertex of the vertical bisector of the first iBox and the center point of the first sub-projected image to obtain a fifth connection line. The coordinate information of the fifth position limit point includes the distance from the intersection of the fifth connection line and the projection display area to the bottom edge of the alignment glass, and the theoretical wedge angle value when observing the center point of the first sub-projected image at the vertex of the vertical bisector of the first iBox without reflection ghosts. Connect the bottom point of the vertical bisector of the third iBox and the center point of the third sub-projected image to obtain a sixth connection line. The coordinate information of the sixth position limit point includes the distance from the intersection of the sixth connection line and the projection display area to the bottom edge of the alignment glass, and the theoretical wedge angle value when observing the center point of the third sub-projected image at the bottom point of the vertical bisector of the third iBox without reflection ghosts. The head-up display system according to claim 4, characterized in that.

6. Connect the first position limit point and the fourth position limit point to form a first position limit line segment, connect the second position limit point and the third position limit point to form a second position limit line segment, and the approximate curve of the actual wedge angle intersects the first position limit line segment and / or the approximate curve of the actual wedge angle intersects the second position limit line segment. The head-up display system according to claim 4, characterized in that.

7. The approximate curve of the actual wedge angle passes through a seventh position limit point, and the seventh position limit point is the center of mass of the distribution of a plurality of theoretical wedge angle values without reflection ghosts when observing the second sub-projected image at each point of the vertical bisector of the second iBox in the coordinate system where the approximate curve of the actual wedge angle is located. The head-up display system according to any one of claims 4 to 6, characterized in that.

8. The approximate curve of the actual wedge angle passes through an eighth position limit point. Connect the midpoint of the vertical bisector of the second iBox and the center point of the second sub-projected image to obtain an eighth connection line. The coordinate information of the eighth position limit point includes the distance from the intersection of the eighth connection line and the projection display area to the bottom edge of the alignment glass, and the theoretical wedge angle value when observing the center point of the second sub-projected image at the midpoint of the vertical bisector of the second iBox without reflection ghosts. The head-up display system according to any one of claims 4 to 6, characterized in that...

9. In the direction from the bottom side to the top side of the combined glass, the ratio of the length of the segment to the length of the projection display area is 70% or more. The head-up display system according to claim 1, characterized in that...

10. The at least one projection display area includes at least one first projection display area and at least one second projection display area. The projection light source is configured to project light rays onto the first projection display area to form a first projection image, and the virtual image distance of the first projection image is 7 m to 100 m. The projection light source is configured to project light rays onto the second projection display area to form a second projection image, and the virtual image distance of the second projection image is 1 m to 6 m. The head-up display system according to claim 1, characterized in that...

11. 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 configured to project light rays onto the first projection display area, and the second projection light source is configured to project light rays onto the second projection display area. The head-up display system according to claim 10, characterized in that...

12. A design method for a head-up display system, comprising: providing a projection assembly and a combined glass, wherein projection light rays emitted from the projection assembly are incident on at least one projection display area of the combined glass; designing an instrument panel surface located inside the vehicle based on an observer inside the vehicle; designing a virtual image surface based on projection images observed by the observer inside the vehicle through each projection display area; wherein the instrument panel surface includes a plurality of sub-instrument panel surfaces sequentially arranged from a lower position to a higher position, and the virtual image surface correspondingly includes a plurality of sub-virtual image surfaces sequentially arranged from a higher position to a lower position. Each sub-virtual image surface corresponds to one sub-instrument panel surface. Select an observation dot matrix on each sub-eye box surface and a virtual image dot matrix on each sub-virtual image surface, wherein the connecting line between a point in the observation dot matrix and a point in the virtual image dot matrix passes through the corresponding projection display area, and the intersection point of the connecting line and the projection display area is the incident point, and select; Based on the projection assembly, the alignment glass, and a plurality of connecting lines, calculate a plurality of theoretical wedge angle values of the alignment glass when the projection image has no reflection ghost at the corresponding incident point; Based on 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 alignment glass, perform fitting to obtain a first change curve of the wedge angle associated with the distance from the incident point to the bottom edge of the alignment glass; Calculate a plurality of position limit points based on 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 alignment glass, and sequentially connect the plurality of position limit points to form a surrounding of a preset area; Adjust the first change curve so that the adjusted first change curve has a continuous curve accommodated in the preset area; Based on the adjusted first change curve, determine the wedge angle value of the alignment glass in the corresponding projection display area, including. A method for designing a head-up display system, characterized by the above.

13. The adjusted first change curve conforms to a first to fourth order function and has a continuous curve that continuously decreases non-linearly. The method for designing a head-up display system according to claim 12, characterized by the above.

14. The eye box surface includes a first sub-eye box surface, a second sub-eye box surface, and a third sub-eye box surface sequentially arranged from low to high, and the virtual image surface correspondingly includes a first sub-virtual image surface, a second sub-virtual image surface, and a third sub-virtual image surface sequentially arranged from high to low. The preset area is a polygon, and the plurality of position limit points include a first position limit point, a second position limit point, a third position limit point, and a fourth position limit point. Calculating a plurality of position limit points based on the plurality of theoretical wedge angle values and the distances from the incident points corresponding to the respective theoretical wedge angle values to the bottom edge of the alignment glass, Connecting the bottom point of the perpendicular bisector of the first sub-eye box surface and the center point of the first sub-virtual image surface to obtain a first connection line, the first connection line and the projection display area intersect at a first incident point, connecting the apex of the perpendicular bisector of the second sub-eye box surface and the upper left corner point of the second sub-virtual image surface to obtain a second connection line, the second connection line and the projection display area intersect at a second incident point, connecting the apex of the perpendicular bisector of the third sub-eye box surface and the center point of the third sub-virtual image surface to obtain a third connection line, the third connection line and the projection display area intersect at a third incident point, connecting the bottom point of the perpendicular bisector of the second sub-eye box surface and the lower right corner point of the second sub-virtual image surface to obtain a fourth connection line, and the fourth connection line and the projection display area intersect at a fourth incident point, Based on the projection assembly, the alignment glass, the first connection line, the second connection line, the third connection line, and the fourth connection line, calculating a first position limit theoretical wedge angle value when there is no reflection ghost at the first incident point, a second position limit theoretical wedge angle value when there is no reflection ghost at the second incident point, a third position limit theoretical wedge angle value when there is no reflection ghost at the third incident point, and a fourth position limit theoretical wedge angle value when there is no reflection ghost at the fourth incident point, Obtaining a first position limit point based on the first position limit theoretical wedge angle value and the distance from the first incident point to the bottom edge of the alignment glass, obtaining a second position limit point based on the second position limit theoretical wedge angle value and the distance from the second incident point to the bottom edge of the alignment glass, obtaining a third position limit point based on the third position limit theoretical wedge angle value and the distance from the third incident point to the bottom edge of the alignment glass, and obtaining a fourth position limit point based on the fourth position limit theoretical wedge angle value and the distance from the fourth incident point to the bottom edge of the alignment glass, including The method for designing a head-up display system according to claim 12, characterized in that.

15. Obtain a first position limit point based on the above-mentioned first position limit theoretical wedge angle value and the distance from the first incident point to the bottom edge of the alignment glass, obtain a second position limit point based on the second position limit theoretical wedge angle value and the distance from the second incident point to the bottom edge of the alignment glass, obtain a third position limit point based on the third position limit theoretical wedge angle value and the distance from the third incident point to the bottom edge of the alignment glass, and obtain a fourth position limit point based on the fourth position limit theoretical wedge angle value and the distance from the fourth incident point to the bottom edge of the alignment glass. After that, calculating a plurality of position limit points based on the above-mentioned plurality of theoretical wedge angle values and the distances from the incident points corresponding to each of the theoretical wedge angle values to the bottom edge of the alignment glass further includes Connect the vertex of the perpendicular bisector of the first sub-eye box surface and the center point of the first sub-virtual image surface to obtain a fifth connection line. The fifth connection line intersects the projection display area at a fifth incident point. Connect the bottom point of the perpendicular bisector of the third sub-eye box surface and the center point of the third sub-virtual image surface to obtain a sixth connection line. The sixth connection line intersects the projection display area at a sixth incident point, Based on the projection assembly, the alignment glass, the fifth connection line, and the sixth connection line, calculate a fifth position limit theoretical wedge angle value when there is no reflection ghost at the fifth incident point and a sixth position limit theoretical wedge angle value when there is no reflection ghost at the sixth incident point, Obtain a fifth position limit point based on the fifth position limit theoretical wedge angle value and the distance from the fifth incident point to the bottom edge of the alignment glass, and obtain a sixth position limit point based on the sixth position limit theoretical wedge angle value and the distance from the sixth incident point to the bottom edge of the alignment glass, The vertices of the preset area further include the fifth position limit point and the sixth position limit point. The preset area is formed by being surrounded by the sequential connection of the first position limit point, the fifth position limit point, the second position limit point, the third position limit point, the sixth position limit point, and the fourth position limit point, A method for designing a head-up display system according to claim 14, characterized in that.

16. The connecting line between the first position limit point and the fourth position limit point is the first position limit line segment, and the connecting line between the second position limit point and the third position limit point is the second position limit line segment. Adjusting the first change curve so that the adjusted first change curve has a continuous curve contained in the preset region is adjusting the first change curve so that the adjusted first change curve has a continuous curve contained in the preset region, and the adjusted first change curve intersects the first position limit line segment and / or the adjusted first change curve intersects the second position limit line segment, including A method for designing a head-up display system according to claim 15, characterized in that.

17. Calculating a plurality of position limit points based on the plurality of theoretical wedge angle values and the distances from the incident points corresponding to the respective theoretical wedge angle values to the bottom edge of the alignment glass is Connecting an observation point on the perpendicular bisector of the second sub-eye box surface and an imaginary point on the second sub-virtual image surface to obtain a plurality of seventh connecting lines, and the plurality of seventh connecting lines and the projection display area intersect to obtain a plurality of seventh incident points Calculating a plurality of seventh position limit theoretical wedge angle values when there is no reflection ghost at the plurality of seventh incident points based on the projection assembly, the alignment glass, and the plurality of seventh connecting lines Obtaining a scatter distribution based on the plurality of seventh position limit theoretical wedge angle values and the distances from the plurality of seventh incident points to the bottom edge of the alignment glass, and calculating the center of mass of the scatter distribution to obtain a seventh position limit point, including Adjusting the first change curve so that the adjusted first change curve has a continuous curve contained in the preset region is Adjusting the first change curve so that the adjusted first change curve has a continuous curve contained in the preset region, and the adjusted first change curve passes through the seventh position limit point, including A method for designing a head-up display system according to any one of claims 14 to 16, characterized in that.

18. Calculating a plurality of position limit points based on the plurality of theoretical wedge angle values and the distances from the incident points corresponding to the respective theoretical wedge angle values to the bottom edge of the alignment glass is Connect the midpoint of the perpendicular bisector of the second sub-eye box surface and the center point of the second sub-virtual image surface to obtain an eighth connection line, and the eighth connection line intersects the projection display area to obtain an eighth incident point, Based on the projection assembly, the alignment glass, and the eighth connection line, calculate the eighth position-limiting theoretical wedge angle value when there is no reflection ghost at the eighth incident point, Obtain an eighth position-limiting point based on the eighth position-limiting theoretical wedge angle value and the distance from the eighth incident point to the bottom edge of the alignment glass, Adjusting the first change curve so that the adjusted first change curve has a continuous curve contained in the preset area, Adjust the first change curve so that the adjusted first change curve has a continuous curve contained in the preset area, and the adjusted first change curve passes through the eighth position-limiting point, The design method of the head-up display system according to any one of claims 14 to 16, characterized in that.

19. The ratio value of the maximum local range ΔW of the plurality of theoretical wedge angle values to the overall range ΔC of the plurality of theoretical wedge angle values satisfies ΔW / ΔC≤0.9, The design method of the head-up display system according to claim 12, characterized in that.

20. The at least one projection display area includes at least two first projection display areas or at least two second projection display areas. After fitting to obtain at least two adjusted first change curves of the wedge angle associated with the distance from the incident point to the bottom edge of the alignment glass, when the maximum deviation value between two adjacent adjusted first change curves is greater than 0.15 mrad, after determining the wedge angle value in the corresponding projection display area of the alignment glass based on the adjusted first change curve, the design method of the head-up display system further includes Adjusting the distance between the eye box surface and the virtual image surface corresponding to one of the two adjacent adjusted first change curves, Recalculating a new plurality of the theoretical wedge angle values, Based on the new plurality of theoretical wedge angles and the distances from the incident points corresponding to each of the theoretical wedge angles to the bottom edge of the alignment glass, perform fitting to obtain a new first change curve of the wedge angle associated with the distance from the incident point to the bottom edge of the alignment glass, and calculate a new preset region; Adjust the new first change curve so that the adjusted new first change curve has a continuous curve contained in the new preset region; Determine whether the maximum deviation value between the adjusted new first change curve and the other one of the two adjacent adjusted first change curves is 0.15 mrad or less; If it is determined to be no, repeat the above procedure; If it is determined to be yes, based on the adjusted new first change curve, determine the wedge angle value in the corresponding first projection display region or the second projection display region of the alignment glass; A method for designing a head-up display system according to claim 12, characterized in that.

21. The at least one projection display region includes at least one first projection display region and at least one second projection display region. Perform fitting to obtain at least two adjusted first change curves of the wedge angle associated with the distance from the incident point to the bottom edge of the alignment glass. When the maximum deviation value between two adjacent adjusted first change curves is greater than 0.2 mrad, after determining the wedge angle value in the corresponding projection display region of the alignment glass based on the adjusted first change curve, the method for designing a head-up display system further includes: Adjusting the distance between the eyebox plane and the virtual image plane corresponding to one of the two adjacent adjusted first change curves; Recalculating a new plurality of the theoretical wedge angles; Based on the new plurality of theoretical wedge angles and the distances from the incident points corresponding to each of the theoretical wedge angles to the bottom edge of the alignment glass, perform fitting to obtain a new first change curve of the wedge angle associated with the distance from the incident point to the bottom edge of the alignment glass, and calculate a new preset region; Adjust the new first change curve so that the adjusted new first change curve has a continuous curve contained in the new preset region; Determine whether the maximum deviation value between the adjusted new first change curve and the other one of the two adjacent adjusted first change curves is 0.2 mrad or less. If it is determined as "no", repeat the above procedure. If it is determined as "yes", based on the adjusted new first change curve, determining the wedge angle value in the corresponding first projection display area or the second projection display area of the combined glass, is included. A method for designing a head-up display system according to claim 12, characterized by the above.

22. The set of the adjusted plurality of theoretical wedge angle values has a maximum local range ΔWU, the set of the adjusted plurality of theoretical wedge angle values has an overall range ΔCU, and the ratio value of ΔWU to ΔCU satisfies ΔWU / ΔCU ≤ 0.

9. A method for designing a head-up display system according to claim 21, characterized by the above.

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