Laminated glass, head-up display system, and vehicle

Abstract

The application provides laminated glass, a head-up display system and a vehicle. The laminated glass has a projection display area, the projection display area has a wedge structure; there is a first relationship curve between a vertical ghost value observed by an upper eyebox area corresponding to a farthest virtual image surface and a wedge angle of the wedge structure; there is a second relationship curve between a vertical ghost value observed by a lower eyebox area corresponding to a nearest virtual image surface and the wedge angle of the wedge structure; and the wedge angle of the wedge structure is a wedge angle corresponding to an intersection point of the first relationship curve and the second relationship curve. The application limits the wedge angle of the wedge structure at the intersection point between the first relationship curve of the upper eyebox area associated with the farthest virtual image surface and the second relationship curve of the lower eyebox area associated with the nearest virtual image surface, thereby solving the ghost elimination conflict caused by a large difference in the imaging distance of the far and near images, reducing the ghost tolerance, improving the image definition, and realizing the effect of overlapping the far and near image ghosts and the main image by using a single wedge angle of the laminated glass.

Description

Technical Field

[0001] This application belongs to the field of glass technology, specifically relating to laminated glass, head-up display systems, and vehicles. Background Technology

[0002] In vehicles, the image projected onto the laminated glass display area typically includes a primary image and ghosting. Ghosting causes the image to appear blurry to the human eye, leading to dizziness and a poor viewing experience. For display images formed by coaxial multiple virtual image planes, the different optimal wedge angles required for the near and far virtual image planes, coupled with the lack of separation between the projection display areas, result in poor ghosting elimination, further reducing the user's viewing experience. Summary of the Invention

[0003] In view of this, a first aspect of this application provides a laminated glass having a projection display area; the projection display area is used to reflect a projected image and form a display image that can be observed at the eye box;

[0004] The displayed image is formed on multiple virtual image surfaces, and the multiple virtual image surfaces overlap at least partially within the projection display area;

[0005] The plurality of virtual image planes that at least partially overlap include the farthest virtual image plane and the nearest virtual image plane;

[0006] The eye box includes an upper eye box area and a lower eye box area corresponding to each virtual image plane;

[0007] The projection display area has a wedge-shaped structure along the vertical direction;

[0008] There is a first relationship curve between the vertical ghosting value observed in the upper eyelid box area corresponding to the farthest virtual image plane and the wedge angle of the wedge structure;

[0009] There is a second relationship curve between the vertical ghosting value observed in the lower eyelid box area corresponding to the nearest virtual image plane and the wedge angle of the wedge structure;

[0010] The wedge angle of the wedge structure is configured as the wedge angle corresponding to the intersection of the first relationship curve and the second relationship curve.

[0011] The farthest virtual image plane and the nearest virtual image plane are located on the same principal optical axis.

[0012] The wedge angle of the wedge structure is a fixed value.

[0013] The ratio R of the imaging distance of the farthest virtual image surface to the imaging distance of the nearest virtual image surface satisfies: R = a × Gd / Gm + b, a = 0.9 ~ 1.1, b = -0.1 ~ 0.1;

[0014] Among them, there is a third relationship curve between the vertical ghosting value observed in the lower eyelid box area corresponding to the farthest virtual image plane and the wedge angle of the wedge structure; Gd is the ghosting value at the intersection of the first relationship curve and the second relationship curve, and Gm is the ghosting value at the intersection of the first relationship curve and the third relationship curve.

[0015] Where Gm < Gd.

[0016] The ratio R is 1 to 3.5, or 1.5 to 3.5, or 2 to 3.5.

[0017] Wherein, the ghost value Gd ≤ 1.5′, or ≤ 1′, or ≤ 0.5′.

[0018] Wherein, the ghost value Gm ≤ 1.5′, or ≤ 1′, or ≤ 0.5′.

[0019] The eye box further includes a middle eye box area corresponding to each virtual image plane. The vertical ghosting values ​​observed in the corresponding upper eye box area, middle eye box area and lower eye box area have a ghosting tolerance T, wherein the ghosting tolerance T≤3′.

[0020] Wherein, Gd is the ghost value at the intersection of the first relationship curve and the second relationship curve, and the ghost value Gd satisfies: Gd≤1 / 2×T.

[0021] The laminated glass includes a first glass plate, an adhesive layer, and a second glass plate stacked sequentially. The adhesive layer connects the first glass plate and the second glass plate. At least one of the first glass plate, the adhesive layer, and the second glass plate constitutes the wedge-shaped structure.

[0022] A second aspect of this application provides a head-up display system, the head-up display system including a projection device and a laminated glass as provided in the first aspect of this application, the projection device being disposed on one side of the laminated glass, the projection device being used to generate projection light.

[0023] A third aspect of this application provides a vehicle comprising a body and a laminated glass as provided in the first aspect of this application, the laminated glass being mounted on the body.

[0024] The laminated glass, head-up display system, and vehicle provided in this application, by defining the wedge angle at the intersection point between the first relationship curve of the upper eyebox area associated with the farthest virtual image plane and the second relationship curve of the lower eyebox area associated with the nearest virtual image plane as a wedge-shaped wedge angle, can accommodate the ghosting conflict caused by large differences in imaging distance between near and far images, reduce ghosting tolerance, improve image clarity, and achieve the effect of overlapping near and far image ghosting with the main image using laminated glass with a single wedge angle. Furthermore, it also defines the ghosting value ratio at the intersection point of the first relationship curve and the second relationship curve, and the intersection point between the first relationship curve and the third relationship curve of the lower eyebox area associated with the farthest virtual image plane, to satisfy a certain relationship, and links the ratio R with the ratio Gd / Gm, while ensuring a good ghosting and main image overlap effect, it provides a larger difference in imaging distance between near and far images for design selection. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0026] Figure 1 This is a schematic diagram of the structure of a head-up display system provided in one embodiment of this application.

[0027] Figure 2 A graph showing the relationship between the vertical ghosting value of the eye box area and the wedge angle provided in one embodiment of this application.

[0028] Figure 3 A fitting data graph showing the relationship between the ratio R and the ratio Gd / Gm provided in one embodiment of this application.

[0029] Figure 4 A schematic diagram of a laminated glass with a wedge-shaped structure is provided for one embodiment of this application.

[0030] Figure 5 A schematic diagram of a laminated glass with a wedge-shaped structure is provided for another embodiment of this application.

[0031] Figure 6 A schematic diagram of a laminated glass with a wedge-shaped structure is provided for another embodiment of this application.

[0032] Labeling explanation: laminated glass 1, first glass plate 11, adhesive layer 12, second glass plate 13, head-up display system 2, projection device 21, virtual image surface 22, farthest virtual image surface 22a, nearest virtual image surface 22b. Detailed Implementation

[0033] The following are preferred embodiments of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

[0034] Before introducing the technical solution of this application, let's go over the technical issues in related technologies in detail.

[0035] Single-image-plane ARHUDs can only image at a fixed imaging distance, preventing the driver's gaze from zooming to other depths. Prolonged viewing can easily cause visual fatigue and negatively impact the human-computer interaction experience. Therefore, using tilted virtual images or ARHUDs with multiple virtual images has become a trend. The near-field image displays instrument panel and settings information, while the far-field image displays AR navigation, distance warnings, and other information. Combining near and far views provides a better fusion effect, truly achieving a look-alike experience without needing to look down.

[0036] Multi-virtual-image-plane HUDs can be further classified into coaxial multi-virtual-image-plane (≥2 virtual image planes) and off-axis multi-virtual-image-plane (usually only 2 virtual image planes) based on the difference in viewing angle along the principal optical axis between near and far images. For example... Figure 1 As shown, in a coaxial multi-virtual-image-plane HUD, the near and far image beams overlap in the reflection area on the inner surface of the laminated glass. In an off-axis multi-virtual-image-plane HUD, the near and far image beams are separated in the reflection area on the inner surface of the laminated glass.

[0037] Because the projected image light is reflected from both the inner and outer surfaces of the laminated glass in the transparent area, the virtual image formed by the reflection from the outer surface is called ghosting. This often reduces image clarity and diminishes the user experience of the HUD. Laminated glass with a wedge angle is typically used to reduce the distance between the ghosting and the main image, allowing the ghosting to overlap with the main image and reducing the blurriness and dizziness experienced by the human eye.

[0038] However, for display images formed by coaxial multiple virtual image surfaces, since the optimal wedge angles required for the far and near virtual image surfaces are different, and the projection display areas are not separated, it is impossible to use a variable wedge scheme to simultaneously reduce the ghosting of the two optical paths. This results in poor ghosting elimination effect of the display image, especially the ghosting of the eye area on the far virtual image surface and the lower eye area on the near virtual image surface is more obvious, thus reducing the user's viewing experience.

[0039] In view of this, in order to solve the above problems, please refer to the following: Figures 1-6This embodiment provides a laminated glass 1 having a projection display area; the projection display area is used to reflect a projected image and form a display image that can be observed at an eye box; the display image is formed on a plurality of virtual image surfaces 22, and the plurality of virtual image surfaces 22 at least partially overlap within the projection display area; the plurality of virtual image surfaces 22 that at least partially overlap include the farthest virtual image surface 22a and the nearest virtual image surface 22b.

[0040] The eye box includes an upper eye box area and a lower eye box area corresponding to each virtual image surface 22; the projection display area has a wedge-shaped structure along the vertical direction; there is a first relationship curve between the vertical ghosting value observed in the upper eye box area corresponding to the farthest virtual image surface 22a and the wedge angle of the wedge-shaped structure; there is a second relationship curve between the vertical ghosting value observed in the lower eye box area corresponding to the nearest virtual image surface 22b and the wedge angle of the wedge-shaped structure; the wedge angle of the wedge-shaped structure is configured as the wedge angle corresponding to the intersection of the first relationship curve and the second relationship curve.

[0041] The number of virtual image surfaces 22 is at least two, but can be two, three, four, or five, etc. A virtual image surface 22 refers to the plane where light rays are focused in space. In a HUD system, the virtual image surface 22 is typically used to describe the imaging position of the virtual image. The multiple virtual image surfaces 22 include the farthest virtual image surface 22a and the closest virtual image surface 22b. The farthest virtual image surface 22a is the virtual image surface 22 with the largest imaging distance, which can also be understood as the virtual image surface 22 furthest from the user; the closest virtual image surface 22b is the virtual image surface 22 with the smallest imaging distance, which can also be understood as the virtual image surface 22 closest to the user.

[0042] The eye box includes an upper eye box area, a middle eye box area, and a lower eye box area arranged vertically. The upper eye box area is located in the upper region, the middle eye box area is located in the center region, and the lower eye box area is located in the lower region.

[0043] In one embodiment, the farthest virtual image plane 22a and the nearest virtual image plane 22b are located on the same principal optical axis.

[0044] In one embodiment, the wedge angle of the wedge structure is a fixed value. This fixed value is a theoretical design value; in actual production, fluctuations in the wedge angle due to manufacturing tolerances are also within this range.

[0045] Optionally, along the arrangement direction from the edge of the laminated glass 1 to the center of the laminated glass 1, the thickness of the laminated glass 1 with the wedge structure gradually increases, or the thickness of the laminated glass 1 with the wedge structure gradually decreases. In other words, the laminated glass 1 is thicker at the top and thinner at the bottom, or thinner at the top and thicker at the bottom.

[0046] Specifically, the laminated glass 1 includes a first glass plate 11, an adhesive layer 12, and a second glass plate 13 stacked sequentially. The adhesive layer 12 connects the first glass plate 11 and the second glass plate 13. At least one of the first glass plate 11, the adhesive layer 12, and the second glass plate 13 has the wedge-shaped structure.

[0047] The first glass panel 11 serves as the outer glass panel of the laminated glass 1, and the second glass panel 13 serves as the inner glass panel of the laminated glass 1. The first glass panel 11 has a first surface and a second surface; the first surface faces away from the adhesive layer 12 and is in contact with the external environment of the vehicle, while the second surface is close to the adhesive layer 12. The second glass panel 13 has a third surface and a fourth surface; the third surface is close to the adhesive layer 12, while the fourth surface faces away from the adhesive layer 12 and is close to the internal environment of the vehicle. At least a portion of the adhesive layer 12 connects the second surface and the third surface. The displayed image formed by the projection display area can be observed by occupants inside the vehicle.

[0048] The first glass plate 11 has a thickness of 1.6mm to 2.5mm and a visible light transmittance of ≥70%, ≥80%, or ≥90%. The first glass plate 11 is either transparent glass or ultra-transparent glass (ultra-white glass). The total iron content (calculated as Fe2O3) of the transparent glass (standard white glass) is less than or equal to 0.1%, even less than or equal to 0.05%, and the visible light transmittance of the transparent glass is 80% to 95%. The total iron content (calculated as Fe2O3) of the ultra-transparent glass (ultra-white glass) is less than or equal to 0.015%, even less than or equal to 0.01%, and even less than or equal to 50 PPM, and the visible light transmittance of the ultra-transparent glass is 90% to 95%. For example, the first glass plate 11 can be 2.1mm thick transparent glass with a visible light transmittance of 89%, or 1.6mm thick green glass with a visible light transmittance of 83%, or 2.1mm thick green glass with a visible light transmittance of 80%.

[0049] The adhesive layer 12 can be a transparent thermoplastic polymer film or a light-colored thermoplastic polymer film, and the thickness of the adhesive layer 12 is 0.2 mm to 1 mm. For example, the thickness of the adhesive layer 12 can be, but is not limited to, 0.2 mm, 0.38 mm, 0.76 mm, or 1 mm, etc. The material of the thermoplastic polymer film can be selected from at least one of polyvinyl butyral (PVB), polyurethane (PU), ethylene-vinyl acetate copolymer (EVA), TPU (thermoplastic polyurethane), and ionomer polymer (SGP).

[0050] Optionally, the visible light transmittance of the adhesive layer 12 is ≥70%, ≥80%, or ≥85%. When the adhesive layer 12 is a transparent thermoplastic polymer, the visible light transmittance of the transparent thermoplastic polymer is greater than or equal to 85%. For example, the visible light transmittance of the adhesive layer 12 can be, but is not limited to, 85%, 90%, or 95%.

[0051] Optionally, the adhesive layer 12 can be a single-layer or multi-layer structure. Examples of multi-layer structures include double-layer, triple-layer, quadruple-layer, and five-layer structures. The adhesive layer 12 can also have other functions, such as adding infrared absorbers to provide sun protection or heat insulation, adding ultraviolet absorbers to provide ultraviolet protection, or having at least one layer of the multi-layer structure with a higher plasticizer content to provide sound insulation.

[0052] The thickness of the second glass plate 13 is 1.1 mm to 2.5 mm, and the visible light transmittance of the second glass plate 13 is ≥70%, ≥80%, ≥85%, or ≥90%. The second glass plate 13 is transparent glass, ultra-transparent glass, or light-colored glass; the total iron content (calculated as Fe2O3) of the transparent glass (standard clear glass) is less than or equal to 0.1%, or even less than or equal to 0.05%, and the visible light transmittance of the transparent glass is 80% to 95%. The total iron content (calculated as Fe2O3) of the ultra-transparent glass (ultra-clear glass) is less than or equal to 0.015%, or even less than or equal to 0.01%, or even less than or equal to 50 PPM, and the visible light transmittance of the ultra-transparent glass is 90% to 95%. For example, the second glass plate 13 can be 2.1 mm thick transparent glass with a visible light transmittance of 89%, or 1.6 mm thick green glass with a visible light transmittance of 83%, or 2.1 mm thick green glass with a visible light transmittance of 80%.

[0053] For example, such as Figure 4 As shown, only the first glass plate 11 has a wedge-shaped structure, while the adhesive layer 12 and the second glass plate 13 do not, so that the first glass plate 11 alone constitutes the wedge-shaped structure of the laminated glass 1; or, as Figure 5 As shown, only the adhesive layer 12 has a wedge-shaped structure, while the first glass plate 11 and the second glass plate 13 do not, so that the adhesive layer 12 alone constitutes the wedge-shaped structure of the laminated glass 1; or, as Figure 6 As shown, only the second glass plate 13 has a wedge-shaped structure, while the first glass plate 11 and the adhesive layer 12 do not have a wedge-shaped structure, so that the second glass plate 13 alone constitutes the wedge-shaped structure of the laminated glass 1.

[0054] Optionally, the wedge structure is composed of a first sub-wedge structure and a second sub-wedge structure, wherein one of the first glass plate 11, the adhesive layer 12, and the second glass plate 13 has the first sub-wedge structure, and the other of the first glass plate 11, the adhesive layer 12, and the second glass plate 13 has the second sub-wedge structure.

[0055] In other words, the wedge structure can also be composed of multiple components. For example, the first glass plate 11 has a first sub-wedge structure, the adhesive layer 12 has a second sub-wedge structure, and the second glass plate 13 does not have a wedge structure, so that the first glass plate 11 and the adhesive layer 12 together form the wedge structure of the laminated glass 1; or, the second glass plate 13 has a first sub-wedge structure, the adhesive layer 12 has a second sub-wedge structure, and the first glass plate 11 does not have a wedge structure, so that the second glass plate 13 and the adhesive layer 12 together form the wedge structure of the laminated glass 1; or, the first glass plate 11 has a first sub-wedge structure, the second glass plate 13 has a second sub-wedge structure, and the adhesive layer 12 does not have a wedge structure, so that the first glass plate 11 and the second glass plate 13 together form the wedge structure of the laminated glass 1.

[0056] The first relationship curve is a simulation curve with the wedge angle of the wedge structure as the horizontal axis and the vertical ghosting value observed in the upper eyelid box area corresponding to the farthest virtual image plane 22a as the vertical axis. As the wedge angle gradually increases, the vertical ghosting value observed in the upper eyelid box area corresponding to the farthest virtual image plane 22a first decreases and then increases. The vertical ghosting value observed in the upper eyelid box area corresponding to the farthest virtual image plane 22a refers to the ghosting value in the vertical direction of the upper eyelid box area at the farthest virtual image plane 22a.

[0057] The second relationship curve is a simulation curve with the wedge angle of the wedge structure as the horizontal axis and the vertical ghosting value observed in the lower eyelid box area corresponding to the nearest virtual image plane 22b as the vertical axis. As the wedge angle gradually increases, the vertical ghosting value observed in the lower eyelid box area corresponding to the nearest virtual image plane 22b first decreases and then increases. The vertical ghosting value observed in the lower eyelid box area corresponding to the nearest virtual image plane 22b refers to the ghosting value in the vertical direction of the lower eyelid box area within the nearest virtual image plane 22b.

[0058] The wedge angle at the intersection of the first relationship curve and the second relationship curve can also be understood as the value of the abscissa at the intersection of the first relationship curve and the second relationship curve, and this value is used as the wedge angle of the wedge structure.

[0059] This embodiment defines the wedge angle at the intersection of the first relationship curve of the upper eyelid box region associated with the farthest virtual image plane 22a and the second relationship curve of the lower eyelid box region associated with the nearest virtual image plane 22b as the wedge angle of the wedge structure. This complies with the ghosting conflict caused by the large difference in imaging distance between near and far images, reduces ghosting tolerance, improves image clarity, and achieves the effect of overlapping near and far image ghosting with the main image by using laminated glass 1 with a single wedge angle.

[0060] In one embodiment, the ratio R of the imaging distance of the farthest virtual image plane 22a to the imaging distance of the nearest virtual image plane 22b satisfies: R = a × Gd / Gm + b, a = 0.9 to 1.1, b = -0.1 to 0.1.

[0061] Among them, there is a third relationship curve between the vertical ghosting value observed in the lower eyelid box area corresponding to the farthest virtual image plane 22a and the wedge angle of the wedge structure; Gd is the ghosting value at the intersection of the first relationship curve and the second relationship curve, and Gm is the ghosting value at the intersection of the first relationship curve and the third relationship curve.

[0062] The third relationship curve is a simulation curve with the wedge angle of the wedge structure as the horizontal axis and the vertical ghosting value observed in the lower eyelid box area corresponding to the farthest virtual image plane 22a as the vertical axis. As the wedge angle gradually increases, the vertical ghosting value observed in the lower eyelid box area corresponding to the farthest virtual image plane 22a first decreases and then increases. The vertical ghosting value observed in the lower eyelid box area corresponding to the farthest virtual image plane 22a refers to the ghosting value in the vertical direction of the lower eyelid box area at the farthest virtual image plane 22a.

[0063] R is also called the system imaging maximum distance ratio. Gd can also be understood as the value of the ordinate at the intersection of the first and second relationship curves, also known as the ghost value of the farthest and closest imaging intersection. Gm can also be understood as the value of the ordinate at the intersection of the first and third relationship curves, also known as the ghost value of the farthest imaging intersection in the system.

[0064] In one implementation, Gm < Gd.

[0065] In R = a × Gd / Gm + b, a is 0.9 to 1.1, specifically for example, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, or 1.1, etc. Preferably, a is 0.95 to 1.05, more preferably, a is 0.98 to 1.02.

[0066] In R = a × Gd / Gm + b, b is -0.1 to 0.1, specifically for example -0.1, or -0.09, or -0.08, or -0.07, or -0.06, or -0.05, or -0.04, or -0.03, or -0.02, or -0.01, or 0, or 0.01, or 0.02, or 0.03, or 0.04, or 0.05, or 0.06, or 0.07, or 0.08, or 0.09, or 1, etc. Preferably, b is -0.05 to 0.05, more preferably, b is -0.08 to 0.02.

[0067] Optionally, such as Figure 3 As shown, a is 0.9872, b is 0.0523, Gd / Gm is the horizontal axis, R is the vertical axis, and R = 0.9872 × Gd / Gm + 0.0523.

[0068] Optionally, a is 1, b is 0, and R = Gd / Gm.

[0069] In R = a × Gd / Gm + b, the ratio R is 1 to 3.5. For example, it can be 1, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, or 3.5. Preferably, R is 1.5 to 3.5, and more preferably, R is 2 to 3.5.

[0070] In R = a × Gd / Gm + b, the ghosting value Gd ≤ 1.5′. Specific examples include 1.5′, 1.4′, 1.3′, 1.2′, 1.1′, 1′, 0.9′, 0.8′, 0.7′, 0.6′, 0.5′, 0.4′, 0.3′, 0.2′, or 0.1′, etc. Preferably, the ghosting value Gd ≤ 1′, and more preferably, Gd ≤ 0.5′. If the ghosting value Gd > 1.5′, the maximum ghosting of the laminated glass 1 will be large, resulting in a noticeable ghosting that is subjectively unacceptable to the human eye, causing dizziness and a poor user experience.

[0071] In R = a × Gd / Gm + b, the ghost value Gm ≤ 1.5′, specifically, it can be 1.5′ or 1.4′ or 1.3′ or 1.2′ or 1.1′ or 1′ or 0.9′ or 0.8′ or 0.7′ or 0.6′ or 0.5′ or 0.4′ or 0.3′ or 0.2′ or 0.1′, etc. Preferably, the ghost value Gm ≤ 1′, more preferably, the ghost value Gm ≤ 0.75′, and even more preferably, the ghost value Gm ≤ 0.5′.

[0072] In one implementation, since Gm is the ghost value of the farthest imaging intersection point of the system obtained through simulation, the value of Gm can be obtained first and substituted into R = Gd / Gm to calculate the maximum imaging distance ratio suitable for this system. Then, the minimum value of the closest imaging distance that this system can design can be calculated according to this value. Subsequently, the closest imaging distance of this system can be arbitrarily set between the farthest imaging distance and the minimum value of the closest imaging distance as needed. At this time, the system achieves the effect of overlapping the ghost image of the near and far images with the main image by using a single wedge-angle laminated glass 1.

[0073] To ensure good ghosting and main image overlap, a larger maximum imaging distance ratio that the system can support will result in a better user experience. The preferred ghosting value Gd is 1.5′. Based on R = 1.5′ / Gm, the system can be further designed as follows:

[0074] For example, when the ghost value Gm≤0.75′, the system can be designed with at least twice the maximum imaging distance ratio.

[0075] For example, when the ghost value Gm≤0.5′, the system can be designed with at least 3 times the maximum imaging distance ratio.

[0076] This embodiment also limits the ghost value ratio at the intersection of the first relationship curve and the second relationship curve, and the intersection of the first relationship curve and the third relationship curve of the lower eyelid box region associated with the farthest virtual image plane 22a to satisfy a certain relationship, and associates the ratio R with the ratio Gd / Gm. While ensuring a good ghost and main image overlap effect, it provides a greater difference in imaging distance between near and far images for design selection.

[0077] The eye box also includes a middle eye box area corresponding to each virtual image plane. The vertical ghosting values ​​observed in the corresponding upper eye box area, middle eye box area and lower eye box area have a ghosting tolerance T, wherein the ghosting tolerance T≤3′.

[0078] The ghosting tolerance T≤3′, specifically, can be 3′ or 2.5′ or 2′ or 1.5′ or 1′ or 0.5′ or 0, etc. Preferably, the ghosting tolerance T≤2′, and more preferably, the ghosting tolerance T≤1′.

[0079] The ghost value Gd satisfies: Gd≤1 / 2×T. If the ghost value Gd exceeds 1 / 2 of the ghost tolerance T, the maximum ghost value of the laminated glass 1 will be large, causing users to feel dizzy and have a poor experience. In addition, the actual production difficulty of the laminated glass 1 will be greatly increased.

[0080] In summary, the laminated glass 1 provided in this application, by limiting the wedge angle at the intersection point between the first relationship curve of the upper eyelid box region associated with the farthest virtual image plane 22a and the second relationship curve of the lower eyelid box region associated with the nearest virtual image plane 22b to a wedge-shaped structure, can accommodate the ghosting conflict caused by the large difference in imaging distance between near and far images, reduce ghosting tolerance, improve image clarity, and achieve the effect of overlapping near and far image ghosting with the main image using laminated glass 1 with a single wedge angle; furthermore, it also limits the ghosting value ratio at the intersection point of the first relationship curve and the second relationship curve, and the intersection point between the first relationship curve and the third relationship curve of the lower eyelid box region associated with the farthest virtual image plane 22a to satisfy a certain relationship, and associates the ratio R with the ratio Gd / Gm, while ensuring a good ghosting and main image overlap effect, it provides a larger difference in imaging distance between near and far images for design selection.

[0081] Please refer to this as well. Figures 1-6 This application also provides a head-up display system 2, which includes a projection device 21 and a laminated glass 1 as described above. The projection device 21 is disposed on one side of the laminated glass 1 and is used to generate projection light.

[0082] Specifically, the projection device 21 is located on the side of the second glass plate 13 facing away from the adhesive layer 12. Optionally, the projection device 21 is used to generate projection light, which includes P-polarized light and / or S-polarized light. The wavelength of the projection light can be in the range of 380nm-780nm. The projection light is incident on the projection display area at an incident angle of 38°-85°. The projection display area reflects the projection light to form a display image that can be observed by the occupants of the vehicle. In particular, for the driver, the image can be observed without looking down, which improves the driver's field of vision and allows for a longer period of observation of the external situation. At the same time, it makes it easier to obtain the necessary information for assisted driving, greatly improving driving safety. Thus, it can partially or even completely replace the traditional instrument panel, or even eliminate the traditional instrument panel altogether.

[0083] This application also provides a vehicle comprising a body and laminated glass as described above, the laminated glass being mounted on the body.

[0084] The head-up display system's projection device is installed inside the vehicle body, while the laminated glass is installed at the opening in the vehicle body.

[0085] When laminated glass is installed in a vehicle, it is preferably used as the windshield. However, it is not limited to this; laminated glass can also be used as the rear windshield, sunroof, side window, or corner window, thus providing more display application scenarios for the vehicle.

[0086] In summary, the laminated glass 1, head-up display system 2, and vehicle provided in this application, by limiting the wedge angle at the intersection point between the first relationship curve of the upper eyebox region associated with the farthest virtual image plane 22a and the second relationship curve of the lower eyebox region associated with the nearest virtual image plane 22b to a wedge-shaped structure, can accommodate the ghosting conflict caused by large differences in imaging distance between near and far images, reduce ghosting tolerance, improve image clarity, and achieve the effect of overlapping near and far image ghosting with the main image using laminated glass 1 with a single wedge angle. Furthermore, the ratio of ghosting values ​​at the intersection point of the first relationship curve and the second relationship curve, and at the intersection point of the first relationship curve and the third relationship curve of the lower eyebox region associated with the farthest virtual image plane 22a, satisfies a certain relationship, linking the ratio R with the ratio Gd / Gm. While ensuring a good effect of overlapping near and far image ghosting, it provides a larger difference in imaging distance between near and far images for design selection.

[0087] To make the objectives and advantages of this application clearer, the effects of the laminated glass of this application will be further explained in detail below with reference to specific embodiments.

[0088] Comparative Example 1: The system design did not adopt the method of R = a × Gd / Gm + b used in this application.

[0089] Examples 1-2: System design using R = a × Gd / Gm + b in this application.

[0090] The parameters of the laminated glass in Comparative Example 1 and Examples 1-2 are shown in Table 1. The following tests are conducted on the ghosting value Gm, ghosting value Gd, ratio Gd / Gm, farthest imaging distance, closest imaging distance, ratio R, ghosting tolerance T, and subjective perception of the human eye in the laminated glass of Comparative Example 1 and Examples 1-2 provided in this application.

[0091] Table 1: Parameters of laminated glass in Comparative Example 1 and Examples 1-2

[0092]

[0093]

[0094] As shown in Table 1, Comparative Example 1 did not adopt the system design of R = a × Gd / Gm + b in this application, resulting in a ghost value Gd greater than 1.5′, which leads to a large maximum ghost of the laminated glass. The obvious ghost is unacceptable to the human eye, causing dizziness and poor user experience.

[0095] Compared to Comparative Example 1, Example 1 adjusts the relationship between Gm, Gd, and R according to R = a × Gd / Gm + b, and sets the nearest virtual image plane imaging distance suitable for this system, so that the system has a good effect of near and far image ghosting and main image overlap, reduces ghosting tolerance, and improves image clarity.

[0096] Compared to Comparative Example 1, Example 2 adjusts the relationship between Gm, Gd, and R according to R = a × Gd / Gm + b. With the closest imaging distance being 5m, it can accommodate a longer imaging distance and better meet the requirements of the coaxial dual virtual image plane for different imaging distances.

[0097] In summary, both Examples 1 and 2 define the wedge angle at the intersection of the first relationship curve of the upper eyelid box region associated with the farthest virtual image plane and the second relationship curve of the lower eyelid box region associated with the nearest virtual image plane as the wedge angle of the wedge structure. This accommodates the ghosting conflict caused by the large difference in imaging distance between near and far images, reduces ghosting tolerance, and improves image clarity. Furthermore, the ghosting value ratio at the intersection of the first and second relationship curves and the intersection of the first relationship curve and the third relationship curve of the lower eyelid box region associated with the farthest virtual image plane is also defined to satisfy a certain relationship. The ratio R is associated with the ratio Gd / Gm, which provides a larger difference in imaging distance between near and far images for design selection while ensuring good ghosting and main image overlap.

[0098] Unless otherwise stated or in case of conflict, the terms or phrases used in this application shall have the following meanings:

[0099] In this application, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0100] In this application, "one or more" refers to any one, any two, or any two or more of the listed items. "Several" refers to any two or more.

[0101] In this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0102] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0103] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0104] The above description represents some embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A laminated glass, characterized in that, The laminated glass has a projection display area; The projection display area is used to reflect the projected image and form a display image that can be observed at the eye box; The displayed image is formed on multiple virtual image surfaces, and the multiple virtual image surfaces overlap at least partially within the projection display area; The plurality of virtual image planes that at least partially overlap include the farthest virtual image plane and the nearest virtual image plane; The eye box includes an upper eye box area and a lower eye box area corresponding to each virtual image plane; The projection display area has a wedge-shaped structure along the vertical direction; There is a first relationship curve between the vertical ghosting value observed in the upper eyelid box area corresponding to the farthest virtual image plane and the wedge angle of the wedge structure; There is a second relationship curve between the vertical ghosting value observed in the lower eyelid box area corresponding to the nearest virtual image plane and the wedge angle of the wedge structure; The wedge angle of the wedge structure is configured as the wedge angle corresponding to the intersection of the first relationship curve and the second relationship curve.

2. The laminated glass as described in claim 1, characterized in that, The farthest virtual image plane and the nearest virtual image plane are located on the same principal optical axis.

3. The laminated glass as described in claim 1, characterized in that, The wedge angle of the wedge structure is a fixed value.

4. The laminated glass as described in claim 1, characterized in that, The ratio R of the imaging distance of the farthest virtual image surface to the imaging distance of the nearest virtual image surface satisfies: R = a × Gd / Gm + b, a = 0.9 ~ 1.1, b = -0.1 ~ 0.1; Among them, there is a third relationship curve between the vertical ghosting value observed in the lower eyelid box area corresponding to the farthest virtual image plane and the wedge angle of the wedge structure; Gd is the ghosting value at the intersection of the first relationship curve and the second relationship curve, and Gm is the ghosting value at the intersection of the first relationship curve and the third relationship curve.

5. The laminated glass as described in claim 4, characterized in that, Gm < Gd.

6. The laminated glass as described in claim 4, characterized in that, The ratio R is 1 to 3.5, or 1.5 to 3.5, or 2 to 3.

5.

7. The laminated glass as described in claim 4, characterized in that, The ghost value Gd is ≤1.5′, or ≤1′, or ≤0.5′.

8. The laminated glass as described in claim 4, characterized in that, The ghost value Gm is ≤1.5′, or ≤1′, or ≤0.5′.

9. The laminated glass as described in claim 1, characterized in that, The eye box also includes a middle eye box area corresponding to each virtual image plane. The vertical ghosting values ​​observed in the corresponding upper eye box area, middle eye box area and lower eye box area have a ghosting tolerance T, wherein the ghosting tolerance T≤3′.

10. The laminated glass as described in claim 9, characterized in that, Gd is the ghost value at the intersection of the first relationship curve and the second relationship curve, and the ghost value Gd satisfies: Gd≤1 / 2×T.

11. The laminated glass as claimed in claim 1, characterized in that, The laminated glass includes a first glass plate, an adhesive layer, and a second glass plate stacked sequentially. The adhesive layer connects the first glass plate and the second glass plate. At least one of the first glass plate, the adhesive layer, and the second glass plate constitutes the wedge-shaped structure.

12. A head-up display system, characterized in that, The head-up display system includes a projection device and a laminated glass as described in any one of claims 1-11, wherein the projection device is disposed on one side of the laminated glass and is used to generate projection light.

13. A vehicle, characterized in that, The vehicle includes a body and a laminated glass as described in any one of claims 1-11, the laminated glass being mounted on the body.

Images