Head-up display glass, head-up display system and vehicle

Abstract

The embodiment of the invention provides head-up display glass, a head-up display system and a vehicle, the head-up display system comprises projection equipment and head-up display glass, and the head-up display glass comprises a light-transmitting area and a circumferential shielding area surrounding and connected with the light-transmitting area. The head-up display glass further comprises a glass body, a shielding layer and a function display layer with a diffraction grating, the shielding layer and the function display layer are stacked on the glass body, a part of the function display layer and the shielding layer are stacked, the shielding layer is completely located in the shielding area, and the function display layer comprises a first diffraction layer and a second diffraction layer. The first diffraction layer is located in the shielding area, the second diffraction layer is located in the light-transmitting area, and the focal length of the first diffraction layer is smaller than that of the second diffraction layer. The head-up display system comprises the head-up display glass and the projection equipment, projection light emitted by the projection equipment diffracts image information through the first diffraction layer and then emits the image information out of the glass body to form a first image, and the image information is diffracted through the second diffraction layer and then emits the image information out of the glass body to form a second image.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a head-up display glass, a head-up display system and a vehicle. Background Art

[0002] In recent years, with the continuous development of vehicle technology, consumers have higher and higher requirements for vehicle driving safety and intelligence. For example, the head up display (HUD) system of the vehicle is used to project vehicle instrument information such as vehicle speed and fuel level onto the windshield, minimizing the driver's line of sight while driving, so as to enhance the safety of the vehicle while driving.

[0003] With the rise of augmented reality (AR) technology, the vehicle's HUD system combines AR technology to form an AR-HUD system to superimpose digital images on the real environment outside the vehicle, so that drivers and passengers can obtain augmented reality visual effects. Therefore, the AR-HUD system can be used for AR navigation, adaptive cruise control, lane departure warning, etc. Generally, the imaging distance of the AR-HUD system is generally around 7 to 15 meters to better integrate the AR image and road information.

[0004] The current AR-HUD system uses a dual-focal-plane method for dual-screen display, and two sets of image generation modules are required to complete the dual-screen display. Each image generation module is projected onto the glass to form a picture with a different focal length. However, the introduction of two sets of image generation modules will increase the size of the head-up display system, which is not conducive to the efficient use of the vehicle's internal space. Summary of the invention

[0005] The purpose of this application is to provide a head-up display glass, a head-up display system and a vehicle. This application adopts a set of image generation modules, which solves the problem that the introduction of two sets of image generation modules will increase the volume of the head-up display system, and is conducive to the efficient use of the vehicle's internal space.

[0006] In a first aspect, an embodiment of the present application provides a head-up display glass, the head-up display glass comprising a light-transmitting area and a shielding area, the shielding area is arranged around the circumference of the light-transmitting area and connected to the edge of the light-transmitting area;

[0007] The head-up display glass also includes a glass body, a shielding layer and a functional display layer, the shielding layer is stacked on the glass body, the functional display layer is stacked on the glass body and partially stacked with the shielding layer, the shielding layer is completely located in the shielding area, the functional display layer has a diffraction grating, the functional display layer includes a first diffraction layer and a second diffraction layer, the first diffraction layer is located in the shielding area, the second diffraction layer is located in the light-transmitting area, and the focal length of the first diffraction layer is smaller than the focal length of the second diffraction layer.

[0008] In one embodiment, the shielding area includes a bottom shielding area, and the bottom shielding area is located on one side of the light-transmitting area in the height direction;

[0009] The shielding layer includes a bottom shielding layer, and the bottom shielding layer is completely located in the bottom shielding area. Along the thickness direction of the head-up display glass, the projection of the first diffraction layer is located in the projection of the bottom shielding layer.

[0010] In one embodiment, the first diffraction layer and / or the second diffraction layer includes a microlens array structure.

[0011] In one embodiment, the functional display layer further includes a light-transmitting layer, and the light-transmitting layer is located in the light-transmitting area and is arranged on a side of the second diffraction layer away from the first diffraction layer.

[0012] In one embodiment,

[0013] The head-up display glass further includes a first projection area and a second projection area, the first projection area is completely located in the bottom shielding area, the first projection area includes a first sub-projection area and a second sub-projection area, the first sub-projection area is located on one side of the second sub-projection area in a width direction,

[0014] The second projection area is completely located in the light transmission area, the second projection area includes a third sub-projection area and a fourth sub-projection area, the third sub-projection area is located at one side of the fourth sub-projection area in a width direction, and the third sub-projection area is connected to the first sub-projection area, and the fourth sub-projection area is connected to the second sub-projection area;

[0015] Along the thickness direction of the head-up display glass, the projection of the bottom shielding layer is completely located in the first projection area, the projection of the first diffraction layer is completely located in the first sub-projection area, and the projection of the second diffraction layer is completely located in the third sub-projection area.

[0016] In one embodiment, the glass body includes a first glass plate, a second glass plate and a first adhesive layer, the first adhesive layer is connected to the first glass plate and the second glass plate, the shielding layer is connected to the first glass plate and the first adhesive layer, and the functional display layer is connected to the first adhesive layer and the second glass plate.

[0017] In one embodiment, the glass body includes a first glass plate, a second glass plate and a bonding layer, the bonding layer is connected to the first glass plate and the second glass plate, the shielding layer is connected to the second glass plate and the bonding layer, and the functional display layer is connected to the surface of the second glass plate facing away from the first glass plate;

[0018] Alternatively, the shielding layer is connected to the first glass plate and the bonding layer, and the functional display layer is embedded in the bonding layer;

[0019] Alternatively, the shielding layer is connected to the first glass plate and the bonding layer, and the functional display layer is connected to the bonding layer and the second glass plate.

[0020] In one embodiment, the head-up display glass further includes a light control layer, and the light control layer is completely located within the bottom shielding area; along the thickness direction of the head-up display glass, the light control layer is located between the bottom shielding layer and the first diffraction layer, and the projection of the first diffraction layer is completely located within the projection of the bottom shielding layer and the light control layer.

[0021] In one embodiment, the shielding layer includes a hollow portion, which is provided on the bottom shielding layer and penetrates two surfaces of the bottom shielding layer in the thickness direction. Along the thickness direction of the head-up display glass, the projection area of ​​the light control layer is greater than or equal to the projection area of ​​the hollow portion.

[0022] In one embodiment, the light control layer is a dimming film or a low-transmittance adhesive layer.

[0023] In one embodiment, the functional display layer further includes a third diffraction layer, a portion of the third diffraction layer is located in the second sub-projection area, and another portion of the third diffraction layer is located in the fourth sub-projection area;

[0024] The first diffraction layer and the second diffraction layer are disposed on one side of the third diffraction layer in a width direction, and a focal length of the third diffraction layer is different from a focal length of the first diffraction layer and a focal length of the second diffraction layer.

[0025] In one embodiment, the first diffraction layer, the second diffraction layer and the third diffraction layer are integrally formed.

[0026] In one embodiment, the functional display layer is a transparent film.

[0027] In one embodiment, the functional display layer is a single-layer structure or a sandwich structure. When the functional display layer is a single-layer structure, the functional display layer includes a holographic functional layer. When the functional display layer is a sandwich structure, the functional display layer includes a substrate, a full-system functional layer and a protective layer stacked in sequence.

[0028] In one embodiment, the shielding layer is made of a dark ink layer, and the surface roughness of the shielding layer is greater than or equal to 1 μm.

[0029] In a second aspect, an embodiment of the present application provides a head-up display system for a head-up display of a vehicle, the head-up display system comprising a projection device and the head-up display glass, the functional display layer of the head-up display glass being located on a side of the shielding layer facing the projection device, the projection device facing the head-up display glass, and emitting a projection light to the head-up display glass, the projection light diffracts the image information through the first diffraction layer and then emits the projection light to the glass body to form a first image, and at the same time, the projection light diffracts the image information through the second diffraction layer and then emits the projection light to the glass body to form a second image.

[0030] In one embodiment, when the head-up display glass further includes a third diffraction layer, the projection light is diffracted by the third diffraction layer and then emitted from the glass body to form a third image.

[0031] In a third aspect, an embodiment of the present application further provides a vehicle, comprising a vehicle body and the head-up display system, wherein the head-up display system is installed on the vehicle body, the head-up display glass is installed at an opening of the vehicle body, and the projection device is installed inside the vehicle body.

[0032] In the related art, the head-up display system adopts the method of dual focal planes for dual-screen display, and two sets of image generation modules are required to complete the dual-screen display, and each image generation module is projected onto the glass to form a picture with a different focal length. However, the introduction of two sets of image generation modules will increase the volume of the head-up display system, which is not conducive to the efficient use of the vehicle's internal space.

[0033] In an embodiment of the present application, a first projection area and a second projection area are respectively arranged in a light-transmitting area and a shielding area located below the light-transmitting area of ​​the head-up display system, and functional display layers with different focal lengths are arranged in the first projection area and the second projection area. By adopting a separate projection device, the projection device projects the same light to the first projection area and the second projection area of ​​the head-up display glass, and diffracts through the first diffraction layer of the first projection area and displays the first image on the first focal plane, and diffracts through the second diffraction layer of the second projection area and displays the second image on the second focal plane, so as to simultaneously realize dual-focal plane imaging, that is, dual-screen display, without the need to adopt two projection devices for dual-screen display, thereby reducing the volume of the head-up display system and saving production costs.

[0034] In addition, the first diffraction layer is located in the bottom shielding area. The bottom shielding layer can block the light from the external environment of the vehicle. It can be used as the display background of the first image, so that when the driver and passengers observe the first image, they are not disturbed by the light from the external environment of the vehicle, and do not need to occupy the additional light-transmitting area of ​​the head-up display glass for display, which reduces the area occupancy rate of the light-transmitting area of ​​the head-up display glass and fully and efficiently utilizes the area of ​​the shielding area of ​​the head-up display glass. Moreover, the bottom shielding layer also improves the contrast of the first image, making the first image observed by the driver and passengers clearer, ensuring the display quality of the head-up display system. The bottom shielding layer can also well supplement the field of view angle range of the front passenger and the rear seat passengers to observe the first image, so that the first image can also be observed by the passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0036] Figure 2 for Figure 1 A schematic structural diagram of a head-up display system of a vehicle shown;

[0037] Figure 3 for Figure 1 A schematic diagram of a partial structure of a head-up display glass of a vehicle shown;

[0038] Figure 4 for Figure 1 A schematic cross-sectional view of a first embodiment of a head-up display system is shown;

[0039] Figure 5 for Figure 1 A cross-sectional schematic diagram of a second embodiment of a head-up display system is shown;

[0040] Figure 6 for Figure 1 A schematic cross-sectional view of a third embodiment of a head-up display system is shown;

[0041] Figure 7 for Figure 1 A schematic cross-sectional view of a fourth embodiment of a head-up display system is shown;

[0042] Figure 8 for Figure 1 A schematic cross-sectional view of a fifth embodiment of a head-up display system is shown.

[0043] The nouns corresponding to the various reference numerals in the figure are: vehicle 1000, head-up display system 100, head-up display glass 10, light-transmitting area 11, shielding area 12, bottom shielding area 121, projection area 13, first projection area 131, first sub-projection area 131a, second sub-projection area 131b, second projection area 132, third sub-projection area 132a, fourth sub-projection area 132b, glass body G, first glass plate 14, first surface 141, second surface 142, first bonding layer 15, second bonding layer 16, second glass plate 17, third surface 171, fourth surface 172, shielding layer 18, bottom shielding layer 181, functional display layer 19, first diffraction layer 191, second diffraction layer 192, third diffraction layer 193, light-transmitting layer 194, first focal plane A, second focal plane B, hollow portion H, light control layer 20, projection device 30, projection light 31, vehicle body 200. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0045] In the embodiments of the present application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. And "multiple" in this application refers to two or more.

[0046] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application, Figure 2 for Figure 1 The structure of the head-up display system of the vehicle is shown in FIG.

[0047] The embodiment of the present application provides a vehicle 1000. The vehicle 1000 may be, but is not limited to, a sedan, a multi-purpose vehicle (MPV), a sport / suburban utility vehicle (SUV), an off-road vehicle (ORV), a pickup truck, a van, a bus, a truck, etc. In the specific implementation of the present application, the vehicle 1000 takes a sedan as an example.

[0048] For the convenience of description, in this application, the definition Figure 1 The width direction of the vehicle 1000 is the X-axis direction, the length direction is the Y-axis direction, and the height direction is the Z-axis direction. The X-axis, Y-axis, and Z-axis directions are perpendicular to each other.

[0049] The directional terms such as "top", "bottom", "left", "right", "front" and "back" mentioned in the description of this application are based on the attached specification. Figure 1 The description of the orientation of the vehicle 1000 shown is based on the forward direction in the length direction of the vehicle 1000 as the positive direction of the Y axis, the direction from the left to the right in the width direction of the vehicle 1000 as the positive direction of the X axis, and the direction away from the ground in the height direction of the vehicle 1000 as the positive direction of the Z axis.

[0050] The vehicle 1000 includes a head-up display system 100 and a vehicle body 200. The head-up display system 100 is installed on the vehicle body 200. The head-up display system 100 is used for head-up display of the vehicle 1000. The head-up display system 100 includes a head-up display glass 10 and a projection device 30. The head-up display glass 10 is installed at the opening of the vehicle body 200, and the head-up display glass 10 divides the vehicle body 200 into the outside of the vehicle body 200 and the inside of the vehicle body 200. The projection device 30 is installed inside the vehicle body 200, and the projection device 30 faces the head-up display glass 10. In the embodiments of the present application, the projection device 30 may be an image generation unit (Picture Generation Unit, PGU), or may be other modules with image generation functions. This application is not strictly limited.

[0051] It should be noted that the head-up display glass 10 can be used as the front windshield, rear windshield, window glass, corner window glass or sunroof glass of the vehicle 1000. In the specific implementation of the present application, the head-up display glass 10 is described below by taking the front windshield as an example.

[0052] like Figure 2The projection device 30 emits projection light 31 to form an image on the side of the field of view of the vehicle 1000. The image is focused on different areas, which can be understood as imaging at different focal planes. The image is incident on the eyes of the driver and passengers to realize the head-up display function, so that the driver and passengers can observe the real-time situation outside the vehicle 1000 with a better field of view and for a longer time. At the same time, the driver and passengers can more easily obtain the necessary information for auxiliary driving such as driving information and entertainment information, greatly improving driving safety. It should be noted that the focal plane is virtual, not a specific physical device. The focal plane refers to the projection position of the pattern content seen by the driver and passengers. Different focal planes have different focal lengths, that is, different focal planes are different imaging distances from the projection position of the pattern content that the driver and passengers can see to the front of the vehicle 1000.

[0053] In the embodiment of the present application, the head-up display system 100 is an AR-HUD system. The projection light 31 emitted by the projection device 30 to the head-up display glass 10 forms different image information in different areas through the projection light 31 passing through the head-up display glass 10. For the convenience of description, taking two areas as an example, the focal planes of the imaging of the two areas are named as the first focal plane A and the second focal plane B. The image information includes at least the first image information and the second image information. For example, Figure 2 As shown, the projection light 31 projects the first image information and the second image information to the first focal plane A and the second focal plane B respectively. The first image information is diffracted by the head-up display glass 10 and then emitted from the head-up display system 100 to form a first image. The first image is displayed on the first focal plane A, and the driver and the passenger can see the first image at the first focal plane A. The second image information is diffracted by the head-up display glass 10 and then emitted from the head-up display system 100 to form a second image. The second image is displayed on the second focal plane B, and the driver and the passenger can see the second image at the second focal plane B. Optionally, the image information also includes third image information. The projection light 31 projects the third image information to the third focal plane (not shown). The third image information is diffracted by the head-up display glass 10 and then emitted from the head-up display system 100 to form a third image. The third image is displayed on the third focal plane, and the driver and the passenger can see the third image at the third focal plane. Among them, the first focal plane A, the second focal plane B and the third focal plane are all defined for the convenience of understanding the display of image information. In fact, the focal plane is the plane where the projected image is located. The image can be a still picture or a dynamic picture, such as a real-time navigation map, dashboard information, music, video playback, etc.

[0054] For example, the first focal plane A can display information on the dashboard of the vehicle 1000, and can also display weather information, power, time, and music, etc., all of which are of interest to the driver and passengers. The second focal plane B can display information such as AR navigation, adaptive cruise control, and lane departure warning of the vehicle 1000. The information displayed on the first focal plane A and the second focal plane B is set according to the conditions required for driving the vehicle 1000, and is particularly set for the convenience of the driver and the safety performance of the vehicle 1000, and is not limited to the listed ones.

[0055] The first focal plane A can be understood as a near focal plane. The second focal plane B can be understood as a far focal plane. The focal length of the first focal plane A is smaller than the focal length of the second focal plane B. That is to say, the projection light 31 is incident on the first image formed by the head-up display glass 10, and the imaging distance of the first focal plane A where the first image is located from the eye box position of the person inside the vehicle 1000 is approximately 0 to 3 meters. The projection light 31 can be incident on the second image formed by the head-up display glass 10, and the imaging distance of the second focal plane B where the second image is located from the eye box position of the person inside the vehicle 1000 is approximately 7 to 15 meters. Among them, the eye box position is the area range where the human eye can clearly and comfortably see the complete image when using the optical device.

[0056] See also Figure 3 , Figure 3 for Figure 1 A schematic structural diagram of a partial structure of a head-up display glass of a vehicle is shown.

[0057] The head-up display glass 10 includes a light-transmitting area 11 and a shielding area 12. The shielding area 12 is arranged around the circumference of the light-transmitting area 11 and is connected to the edge of the light-transmitting area 11. It should be noted that Figure 3 The middle dashed line indicates the boundary between the shielding area 12 and the transparent area. The head-up display glass 10 further includes a projection area 13. A portion of the projection area 13 is located in the light-transmitting area 11, and another portion of the projection area 13 is located in the shielding area 12 below the light-transmitting area 11.

[0058] The light-transmitting area 11 is a transparent area in the middle of the head-up display glass 10. The light-transmitting area 11 has a high visible light transmittance, and can transmit visible light so that the driver and passengers can observe the environment outside the vehicle 1000 through the light-transmitting area 11. Exemplarily, the visible light transmittance of the light-transmitting area 11 is greater than or equal to 70%.

[0059] The shielding area 12 is an opaque area at the edge of the head-up display glass 10, which is usually an opaque area. The shape of the shielding area 12 is adapted to the shape of the transparent area. The shielding area 12 has a lower visible light transmittance, so as to play the role of shielding sunlight, preventing sunlight from directly irradiating the internal structural parts of the vehicle 1000, avoiding the accelerated aging of the internal structural parts of the vehicle 1000 due to high temperature or ultraviolet radiation of sunlight, extending the service life of the internal structural parts of the vehicle 1000, and making it impossible for the human eye to see the internal structural parts of the vehicle 1000 from the outside of the vehicle 1000, thereby ensuring the overall aesthetics of the vehicle 1000. Exemplarily, the variable light transmittance of the shielding area 12 is less than or equal to 5%.

[0060] The shielding area 12 at least includes a bottom shielding area 121 . Along the height direction of the head-up display glass 10 , the bottom shielding area 121 is located at one side of the height direction of the light-transmitting area 11 , and the bottom shielding area 121 is close to the bottom of the vehicle 1000 .

[0061] Optionally, in some embodiments, the shielding area 12 further includes a top shielding area, a left shielding area, and a right shielding area, wherein the top shielding area and the bottom shielding area 121 are respectively located at opposite sides of the height direction of the light-transmitting area 11, and the top shielding area is close to the top of the vehicle 1000. The left shielding area and the right shielding area are respectively located at opposite sides of the width direction of the light-transmitting area 11, and are connected to the top shielding area and the bottom shielding area 121.

[0062] The projection area 13 includes a first projection area 131 and a second projection area 132. Along the height direction of the head-up display glass 10, the first projection area 131 is located below the second projection area 132 and connected to the second projection area 132. The first projection area 131 is farther from the top of the vehicle 1000 than the second projection area 132. The first projection area 131 is completely located in the shielding area 121 at the bottom. The projection of the first projection area 131 in the thickness direction of the head-up display glass 10 is completely located in the shielding area 121 at the bottom. The first projection area 131 is used to be set corresponding to the first focal plane A, and the projection light 31 displays the first image on the first focal plane A through the first projection area 131. The second projection area 132 is completely located in the light-transmitting area 11, and the second projection area 132 can cover the normal field of vision of the driver. The projection of the second projection area 132 in the thickness direction of the head-up display glass 10 is completely located in the light-transmitting area 11. The second projection area 132 is used to be set corresponding to the second focal plane B, and the projection light 31 displays the second image on the second focal plane B through the second projection area 132.

[0063] It is understandable that the head-up display system 100 uses a single projection device 30 to simultaneously emit projection light 31 to the first projection area 131 and the second projection area 132 of the head-up display glass 10, and displays different image information in the first projection area 131 and the second projection area 132, respectively, so as to realize dual-screen display in the first projection area 131 and the second projection area 132. Compared with the solution of using two projection devices 30 for dual-screen display in the prior art, the embodiment of the present application reduces the volume occupied by the projection device 30 in the head-up display system 100 and the production cost, which is conducive to saving the space inside the vehicle 1000. The specific details are shown in the following embodiment.

[0064] In this embodiment, the first projection area 131 includes a first sub-projection area 131a and a second sub-projection area 131b. Along the X-axis direction, the first sub-projection area 131a is located on one side of the second sub-projection area 131b, and the first sub-projection area 131a is connected to the second sub-projection area 131b. The first sub-projection area 131a is used to correspond to the first focal plane A, which is used for the driver to observe the first image, that is, the first sub-projection area 131a corresponds to the main driving position of the vehicle 1000. For example, the first sub-projection area 131a is used to display weather information, power, time, and music playing, all information that the driver needs and can control and that the passenger needs to obtain. The second sub-projection area 131b is used for the passenger in the co-pilot to observe the image, that is, the second projection area 132 corresponds to the co-pilot position of the vehicle 1000. For example, the second sub-projection area 131b is used to display some public information, such as music, communication messages, etc. Exemplarily, the first sub-projection area 131a and the second sub-projection area 131b are symmetrical about the central axis OO in the width direction of the head-up display glass 10.

[0065] The second projection area 132 includes a third sub-projection area 132a and a fourth sub-projection area 132b. Along the X-axis direction, the third sub-projection area 132a is located on one side of the fourth sub-projection area 132b, and the third sub-projection area 132a is connected to the fourth sub-projection area 132b. The third sub-projection area 132a is used to be set corresponding to the second focal plane B, which is used for the driver of the main driver to observe the second image. That is, the third sub-projection area 132a corresponds to the main driver position of the vehicle 1000. For example, the third sub-projection area 132a is used to display the AR navigation, adaptive cruise, lane departure warning, driving safety and other information of the vehicle 1000, and can also be the information required for automatic driving. The fourth sub-projection area 132b is used for the passenger of the co-pilot to observe the image. That is, the fourth sub-projection area 132b corresponds to the co-pilot position of the vehicle 1000. For example, the fourth sub-projection area 132b is used as an entertainment screen at the co-pilot position, which is used to display entertainment information such as movies and TV. Exemplarily, the third sub-projection area 132 a and the fourth sub-projection area 132 b are symmetrical about the central axis OO in the width direction of the head-up display glass 10 .

[0066] In one embodiment, the main driving position of the vehicle 1000 is located on the left side of the co-driver position of the vehicle 1000, the first sub-projection area 131a is connected to the left side of the second sub-projection area 131b, and the third sub-projection area 132a is connected to the left side of the fourth sub-projection area 132b. Along the height direction of the head-up display glass 10, the third sub-projection area 132a is located above the first sub-projection area 131a and connected to the first sub-projection area 131a. The fourth sub-projection area 132b is located above the second sub-projection area 131b. And connected to the second sub-projection area 131b. In some embodiments, the first sub-projection area 131a and the second sub-projection area 131b can also be arranged at intervals. Alternatively, the third sub-projection area 132a and the fourth sub-projection area 132b can also be arranged at intervals. Alternatively, the third sub-projection area 132a and the first sub-projection area 131a are arranged at intervals. Alternatively, the fourth sub-projection area 132b and the second sub-projection area 131b are arranged at intervals.

[0067] It should be noted that the positional relationship between the transparent area, the shielding area 12, the first projection area 131 and the second projection area 132 of the head-up display glass 10 may not be limited to the following: Figure 3 As shown in the positional relationship, part of the projection area 13 may be arranged on the right side or left side of the shielding area 12 of the light-transmitting area 11, and the first projection area 131 and the second projection area 132 may be arranged at intervals along the height direction of the head-up display glass 10, etc. This application does not limit this.

[0068] Please refer to Figure 3 and Figure 4 , Figure 4 for Figure 1 A schematic cross-sectional view of a first embodiment of a head-up display system is shown.

[0069] In this embodiment, the head-up display glass 10 is a laminated glass structure. The head-up display glass 10 includes a glass body G, and the glass body G includes a first glass plate 14, a first adhesive layer 15, a second adhesive layer 16, and a second glass plate 17. Along the thickness direction of the head-up display glass 10, the first glass plate 14, the first adhesive layer 15, the second adhesive layer 16, and the second glass plate 17 are stacked and connected in sequence. When the head-up display glass 10 is installed on the vehicle body 200, the first glass plate 14 faces the outside of the vehicle 1000, and the second glass plate 17 faces the inside of the vehicle 1000. The first adhesive layer 15 is connected to the first glass plate 14, and the second adhesive layer 16 is connected to the second glass plate 17. In this embodiment, the first adhesive layer 15 and the second adhesive layer 16 can be regarded as adhesive layers of the head-up display glass 10, and the adhesive layers are connected between the first glass plate 14 and the second glass plate 17.

[0070] The first glass plate 14 includes a first surface 141 and a second surface 142. The first surface 141 and the second surface 142 are arranged opposite to each other along the thickness direction of the first glass plate 14. When the head-up display glass 10 is mounted on the vehicle body 200, the first surface 141 of the first glass plate 14 faces the outside of the vehicle 1000, serving as the outer surface of the first glass plate 14 and the outer surface of the head-up display glass 10. The second surface 142 of the first glass plate 14 faces the first adhesive layer 15, serving as the inner surface of the first glass plate 14. In this embodiment, the first glass plate 14 is transparent glass or tinted glass. The thickness of the first glass plate 14 is greater than or equal to 0.7 mm and less than or equal to 4 mm. The visible light transmittance of the first glass plate 14 is greater than 70%.

[0071] The second glass plate 17 includes a third surface 171 and a fourth surface 172. The third surface 171 and the fourth surface 172 are arranged opposite to each other along the thickness direction of the second glass plate 17. When the head-up display glass 10 is mounted on the vehicle body 200, the third surface 171 of the second glass plate 17 faces the second adhesive layer 16 and serves as the inner surface of the second glass plate 17. The fourth surface 172 of the second glass plate 17 faces the interior of the vehicle 1000 and serves as the inner surface of the second glass plate 17 and the inner surface of the head-up display glass 10. In this embodiment, the second glass plate 17 can be transparent glass or tinted glass. The thickness of the second glass plate 17 is greater than or equal to 0.7 mm and less than or equal to 4 mm. The visible light transmittance of the second glass plate 17 is greater than 70%.

[0072] The first adhesive layer 15 and the second adhesive layer 16 are connected, and the first adhesive layer 15 and the second adhesive layer 16 are located between the second surface 142 of the first glass plate 14 and the third surface 171 of the second glass plate 17. The first adhesive layer 15 is connected to the second surface 142 of the first glass plate 14. The second adhesive layer 16 is connected to the third surface 171 of the second glass plate 17. The first adhesive layer 15 and the second adhesive layer 16 are used to bond the first glass plate 14 and the second glass plate 17 together to form a laminated glass structure, thereby improving the structural strength of the head-up display glass 10, preventing the glass slag from splashing after the first glass plate 14 or the second glass plate 17 is broken and scratching the driver or passengers in the car, so that the head-up display glass 10 meets the safety standards and regulatory requirements of more scenarios.

[0073] In this embodiment, the thickness of the first adhesive layer 15 may be greater than or equal to 0.38 mm and less than or equal to 2.28 mm. For example, the thickness of the first adhesive layer 15 may be, but is not limited to, 0.38 mm, 0.76 mm, 1.14 mm, 1.52 mm, 1.9 mm, 2.28 mm, or other values ​​between 0.38 mm and 2.28 mm.

[0074] The thickness of the second adhesive layer 16 may be greater than or equal to 0.38 mm and less than or equal to 2.28 mm. For example, the thickness of the first adhesive layer 15 may be, but is not limited to, 0.38 mm, or 0.76 mm, or 1.14 mm, or 1.52 mm, or 1.9 mm, or 2.28 mm, or other values ​​between 0.38 mm and 2.28 mm.

[0075] The materials of the first adhesive layer 15 and the second adhesive layer 16 may be the same or different. The materials of the first adhesive layer 15 and the second adhesive layer 16 may be, but are not limited to, thermoplastic polymer films or colored thermoplastic polymer films. The material of the thermoplastic polymer film may be selected from at least one of polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyurethane (PU), and ionomer (Sentry Glas Plus, SGP). The present application embodiment does not limit this.

[0076] The head-up display glass 10 further includes a shielding layer 18. The shielding layer 18 is stacked on the glass body G along the thickness direction of the head-up display glass 10, and the shielding layer 18 is located between the first glass plate 14 and the first adhesive layer 15, and the shielding layer 18 is completely located in the shielding area 12 of the head-up display glass 10. That is, the orthographic projection of the shielding layer 18 along the thickness direction of the head-up display glass 10 is completely located in the shielding area 12, so as to achieve the function of shielding light in the shielding area 12. In this embodiment, the shielding layer 18 is provided on the second surface 142 of the first glass plate 14. And it is provided around the edge of the second surface 142 of the first glass plate 14. Optionally, the shielding layer 18 can also be embedded in the first adhesive layer 15.

[0077] The shielding layer 18 has a relatively low visible light transmittance. The shielding layer 18 can be selected from a film layer whose visible light transmittance can be adjusted to be less than or equal to 5%. For example, the shielding layer 18 can be, but is not limited to, a dark ink layer, an opaque polymer film, a light control layer, and the like. The material of the dark ink layer can be, for example, ceramic ink or ultraviolet ink. If the shielding layer 18 is a dark ink layer, the ceramic ink or ultraviolet ink can be printed on the second surface 142 of the first glass plate 14 by screen printing, inkjet printing, and the like, and then cured or sintered at high temperature to form a dark ink layer, thereby forming the shielding layer 18.

[0078] In this embodiment, the shielding layer 18 at least includes a bottom shielding layer 181. The bottom shielding layer 181 is located in the bottom shielding area 121 below the light-transmitting area 11, that is, the projection of the bottom shielding layer 181 in the thickness direction of the head-up display glass 10 is completely located in the shielding area 12 below the light-transmitting area 11. Along the thickness direction of the head-up display glass 10, the projection of the bottom shielding layer 181 is completely located in the first projection area 131. The bottom shielding layer 181 can block the light of the external environment of the vehicle 1000, and can be used as the display background of the first image, so that when the driver and the passenger observe the first image, they are not disturbed by the light of the external environment of the vehicle 1000, and do not need to occupy the light-transmitting area 11 of the head-up display glass 10 for display, which reduces the area occupancy rate of the light-transmitting area 11 of the head-up display glass 10, and fully and efficiently utilizes the area of ​​the shielding area 12 of the head-up display glass 10. Moreover, the bottom shielding layer 181 also improves the contrast of the first image, making the first image observed by the driver and the passenger clearer, thereby ensuring the display quality of the head-up display system 100. In addition, the bottom shielding layer 181 can also well supplement the field of view angle range of the passenger in the front passenger seat and the passenger in the back seat to observe the first image, so that the first image can also be observed by the passengers.

[0079] Alternatively, if Figure 3 As shown, the head-up display glass 10 may further include a top shielding layer, a left shielding layer, and a right shielding layer. The top shielding layer is completely located in the shielding area 12 above the light-transmitting area 11, that is, completely located in the top shielding area. The left shielding layer is completely located in the shielding area 12 on the left side of the light-transmitting area 11, that is, completely located in the left shielding area. The right shielding layer is completely located in the shielding area 12 on the right side of the light-transmitting area 11, that is, completely located in the right shielding area. It can be understood that the left shielding layer and the right shielding layer are arranged at intervals along the width direction of the head-up display glass 10, and the left shielding layer and the right shielding layer are connected to the left shielding layer and the right shielding layer.

[0080] In this embodiment, it can be known from the surface roughness tester that the surface roughness Ra value of the shielding layer 18 needs to be greater than or equal to 1 μm to prevent the top shielding layer, the left shielding layer, and the right shielding layer near the light transmission area 11 from generating mirror reflections and interfering with the vision of the driver or passengers inside the vehicle 1000. For example, the surface roughness Ra value of the shielding layer 18 is, but not limited to, 1.1 μm, 1.5 μm, 1.8 μm, 2.0 μm, 2.5 μm, 3.0 μm, 4.0 μm, 5.0 μm, 6.0 μm, 7.0 μm, 8.0 μm, 9.0 μm, 9.5 μm, 10 μm, etc. Considering the production cost of the head-up display glass 10 and the convenience of the printing process, preferably, the surface roughness Ra value of the shielding layer 18 is greater than or equal to 2 μm and less than or equal to 7 μm. More preferably, the surface roughness Ra value of the shielding layer 18 is greater than or equal to 4 μm and less than or equal to 6.5 μm.

[0081] The head-up display glass 10 further includes a functional display layer 19. Along the thickness direction of the head-up display glass 10, the functional display layer 19 is stacked on the glass body G, and at least part of the functional display layer 19 is stacked with the bottom shielding layer 181, that is, the projection of the functional display layer 19 at least partially overlaps with the projection of the bottom shielding layer 181. The functional display layer 19 is completely located in the projection area 13. The functional display layer 19 is sandwiched between the first adhesive layer 15 and the second adhesive layer 16, and is bonded and fixed by the first adhesive layer 15 and the second adhesive layer 16. The functional display layer 19 is located on the side of the shielding layer 18 facing the projection device 30.

[0082] In the related art, the existing head-up display system 100 usually uses the head-up display glass 10 to reflect the projection light 31 to form a display image. Generally, both the inner surface and the outer surface of the head-up display glass 10 can reflect the projection light 31 to the eyes of the driver or the passenger. The image formed by the reflection of the inner surface and the outer surface has a certain deviation from the display image, which is easy to produce a ghosting phenomenon, affecting the driving safety of the vehicle 1000 and the driving experience of the driver and the passenger.

[0083] In the embodiment of the present application, the functional display layer 19 is a holographic functional display layer (Holographic Cptical Elements, HOE), which can be a transparent film with photosensitive materials, or a film with different phase distributions made by techniques such as embossing, etc., such as a HOE film. The HOE film has a diffraction grating, which diffracts the projection light 31 emitted by the projection device 30, and its diffraction of the projection light 31 belongs to the diffraction principle, and usually only diffracts once. The diffraction angle of the HOE film is different from the reflection angle of the head-up display glass 10. Therefore, the image generated by the projection light 31 emitted by the projection device 30 is received by the driver and the passenger, and the driver and the passenger can only observe one diffraction image, and will not observe the image formed by the reflection of the outer surface and the inner surface of the head-up display glass 10, that is, no ghosting will be observed, which ensures the stable output of the display quality of the head-up display system 100. In addition, the optical function based on the refractive index modulation of the photosensitive material can be introduced into the photosensitive material by means of a double-beam interference exposure method. According to the exposure light path, the functional display layer 19 manipulates the projection light 31 projected by the projection device 30 to the head-up display glass 10, so that the projection light 31 can be deflected and diffracted in a manner similar to a real, optically effective object (such as a mirror or lens), and the deflection and diffraction direction of the light can be "customized", unlike ordinary glass, which follows the law of reflection and has the same angle of incident light and reflected light. Therefore, the functional display layer 19 can be customized to HOE films of different focal lengths, i.e., system virtual image distances (VIDs), and different sizes to meet the different needs of customers.

[0084] The functional display layer 19 can be a single-layer structure or a sandwich structure. If the functional display layer 19 is a single-layer structure, the functional display layer 19 includes a holographic functional layer. If the functional display layer 19 is a sandwich structure, the functional display layer 19 includes a substrate, a holographic functional layer and a protective layer stacked in sequence. The substrate is used to connect to the third surface 171 of the second glass plate 17, and the protective layer is used to connect to the side of the holographic functional layer facing away from the substrate. Both the substrate and the protective layer protect the holographic functional layer. Preferably, the functional display layer 19 adopts a sandwich structure.

[0085] The substrate is made of a transparent material, and the visible light transmittance of the substrate is greater than or equal to 90%, or greater than or equal to 95%. The haze of the substrate is less than or equal to 1%, or less than or equal to 0.5%. The material of the substrate can be, but is not limited to, PET, polycarbonate board (Poly Carbonate Board, PC), TAC, polycarbonate (PC), polymethyl methacrylate (Poly Methyl Meth Acrylate, PMMA), etc. This application does not limit this.

[0086] The holographic functional layer uses its pre-set periodic refractive index change to phase modulate the incident light (such as red, green and blue primary colors), causing the deflection of the light propagation path. Exemplarily, the holographic functional layer has a diffraction grating. When the projection light 31 is incident on the holographic functional layer, it will be refracted according to the preset period of the diffraction grating to form a light with the required exit angle. In this embodiment, the thickness of the holographic functional layer is greater than or equal to 10μm and less than or equal to 100μm. Preferably, the thickness of the holographic functional layer is greater than or equal to 15μm and less than or equal to 30μm. The materials of the holographic functional layer include but are not limited to photopolymers, silver halides, dichromated gelatin, and photorefractive materials. This application does not impose any restrictions on this.

[0087] The protective layer is made of a transparent material, and the visible light transmittance of the protective layer is greater than or equal to 90%, or greater than or equal to 95%. The haze of the protective layer is less than or equal to 1%, or less than or equal to 0.5%. The material of the protective layer can be, but is not limited to, PET, PC, TAC, PMMA, etc. This application does not limit this.

[0088] like Figure 3 and Figure 4 As shown, it should be noted that Figure 4 ] is a schematic cross-sectional view of the head-up display glass 10 on the left side of the central axis OO in the width direction, and thus the third diffraction layer is not shown.

[0089] In this embodiment, the functional display layer 19 includes a first diffraction layer 191, a second diffraction layer 192, and a third diffraction layer 193. Along the height direction of the head-up display glass 10, the first diffraction layer 191 is located below the second diffraction layer 192 and is connected to the second diffraction layer 192. Along the X-axis direction, the first diffraction layer 191 and the second diffraction layer 192 are both located on one side of the third diffraction layer 193. Exemplarily, the first diffraction layer 191 and the second diffraction layer 192 are both connected to the left side of the third diffraction layer 193. The third diffraction layer 193 can be regarded as a diffraction portion of the first diffraction layer 191 and the second diffraction layer 192 on one side of the width direction of the head-up display glass 10. In some embodiments, the first diffraction layer 191 and the second diffraction layer 192 can be spaced apart along the height direction of the head-up display glass 10. The first diffraction layer 191 and the second diffraction layer 192 can be spaced apart from the third diffraction layer 193 along the X-axis direction.

[0090] The first diffraction layer 191 is completely located in the first sub-projection area 131 a , and the projection of the first diffraction layer 191 along the thickness direction of the head-up display glass 10 is completely located in the first sub-projection area 131 a .

[0091] The second diffraction layer 192 is completely located in the third sub-projection area 132 a , and the projection of the second diffraction layer 192 along the thickness direction of the head-up display glass 10 is completely located in the third sub-projection area 132 a .

[0092] The third diffraction layer 193 is completely located in the second sub-projection area 131b and the fourth sub-projection area 132b. The projection of the third diffraction layer 193 along the thickness direction of the head-up display glass 10 is completely located in the second sub-projection area 131b and the fourth sub-projection area 132b.

[0093] That is, the second diffraction layer 192 is disposed in the light-transmitting area 11. The first diffraction layer 191 and part of the third diffraction layer 193 are disposed in the bottom shielding area 121, and along the thickness direction of the head-up display glass 10, the projections of the first diffraction layer 191 and the part of the third diffraction layer 193 are located within the projection of the bottom shielding layer 181. Another part of the third diffraction layer 193 is disposed in the light-transmitting area 11.

[0094] It should be noted that the second diffraction layer 192 is disposed in the light-transmitting area 11, which means that the main part of the second diffraction layer 192 is located in the light-transmitting area 11. In some cases, the second diffraction layer 192 may extend into the bottom shielding area 121, that is, the main part of the second diffraction layer 192 is located in the light-transmitting area 11, and the edge of the second diffraction layer 192 is disposed in the bottom shielding area 121 to shield the film layer boundary where the second diffraction layer 192 and the first diffraction layer 191 are connected, thereby ensuring the aesthetics of the head-up display glass 10.

[0095] In this embodiment, the first diffraction layer 191, the second diffraction layer 192 and the third diffraction layer 193 can be integrally formed. In some other embodiments, the first diffraction layer 191, the second diffraction layer 192 and the third diffraction layer 193 can be separately formed.

[0096] In this embodiment, the focal length of the first diffraction layer 191 and the focal length of the second diffraction layer 192 are different from the focal length of the third diffraction layer 193. Since the functional display layer 19 has different focal lengths, the functional display layer 19 with different focal lengths can select incident light of different angles for diffraction. The focal length of the first diffraction layer 191 and the focal length of the second diffraction layer 192 can meet the field of view of the driver in the main driving position. The focal length of the third diffraction layer 193 meets the field of view of the passenger in the co-pilot position, but cannot meet the field of view of the driver in the main driving position. That is, the passenger in the co-pilot position can observe that the projection light 31 is diffracted by the third diffraction layer 193 and then emitted from the head-up display system 100 to form a third image, while the driver cannot observe that the projection light 31 is diffracted by the third diffraction layer 193 and then emitted from the head-up display system 100 to form a third image, so as to avoid the third image from obstructing the driver's driving field of view, thereby avoiding affecting the driving safety.

[0097] In addition, the focal length of the portion of the third diffraction layer 193 located in the fourth sub-projection area 132b is the same as the focal length of the portion of the third diffraction layer 193 located in the second sub-projection area 131b, that is, the focal length of the portion of the third diffraction layer 193 located in the light-transmitting area 11 is equal to the focal length of the portion of the third diffraction layer 193 located in the shielding area 12, so that the projection light 31 is diffracted by the third diffraction layer 193 and then emitted from the glass body G, and is focused on the third focal plane to form a third image.

[0098] The focal length of the first diffraction layer 191 is smaller than the focal length of the second diffraction layer 192. The first diffraction layer 191 is used to correspond to the first focal plane A, that is, the first diffraction layer 191 is used for near-focus display. That is, the projection light 31 diffracts the first image information through the first diffraction layer 191 and then emits the glass body G, and focuses on the first focal plane A to form a first image, and the first image is observed by the driver of the main seat, the passenger of the co-passenger seat, and the passenger in the back seat. The second diffraction layer 192 is used to correspond to the second focal plane B, that is, the second diffraction layer 192 is used for far-focus display. That is, the projection light 31 diffracts the second image information through the second diffraction layer 192 and then emits the glass body G, and focuses on the second focal plane B to form a second image, and the second image can be observed by the driver of the main seat.

[0099] In the related art, the head-up display system 100 adopts a dual-focal-plane method for dual-screen display, and two sets of image generation modules are required to complete the dual-screen display, and each image generation module is projected onto the glass to form a picture with a different focal length. However, the introduction of two sets of image generation modules will increase the volume of the head-up display system 100, which is not conducive to the efficient use of the internal space of the vehicle 1000.

[0100] Combined Figure 2 and Figure 3 As shown, in the above-mentioned embodiment of the present application, a first projection area 131 and a second projection area 132 are respectively arranged in the light-transmitting area 11 of the head-up display system 100 and the shielding area 12 located below the light-transmitting area 11, and functional display layers 19 with different focal lengths are arranged in the first projection area 131 and the second projection area 132. By adopting a separate projection device 30, the projection device 30 projects the same light to the first projection area 131 and the second projection area 132 of the head-up display glass 10, and diffracts through the first diffraction layer 191 of the first projection area 131 and displays the first image on the first focal plane A, and diffracts through the second diffraction layer 192 of the second projection area 132 and displays the second image on the second focal plane B, so as to simultaneously realize dual-focal plane imaging, that is, dual-screen display, without adopting two projection devices 30 for dual-screen display, thereby reducing the volume of the head-up display system 100 and saving production costs. In addition, the first diffraction layer 191 is located in the bottom shielding area 121 , which can fully utilize the area of ​​the shielding area 12 of the head-up display glass 10 and reduce the area of ​​the light-transmitting area 11 occupied by the functional display layer 19 .

[0101] Since the second diffraction layer 192 and the third diffraction layer 193 are partially transparent in the fourth sub-projection area 132b, even if the second diffraction layer 192 and the third diffraction layer 193 extend into the normal field of vision of the driver, they will not block the driver's line of sight, thereby ensuring the driver's driving safety. The functional display layer 19 of the head-up display glass 10 can be customized in position and size according to customer needs to meet the application of the head-up display system 100 in different scenarios.

[0102] See also Figure 5 , Figure 5 for Figure 1 The cross-sectional schematic diagram of the second embodiment of the head-up display system shown in FIG. Figure 5 ] is a schematic cross-sectional view of the head-up display glass 10 on the left side of the central axis OO in the width direction, and thus the third diffraction layer is not shown.

[0103] In this embodiment, the structure of the head-up display glass 10 is different from that in the first embodiment described above in that the glass body G does not have the second adhesive layer 16, which not only saves the manufacturing cost of the head-up display glass 10, but also reduces the thickness of the head-up display glass 10. The first adhesive layer 15 is located between the first glass plate 14 and the second glass plate 17, and is connected to the second surface 142 of the first glass plate 14 and the third surface 171 of the second glass plate 17. The functional display layer 19 is located between the first adhesive layer 15 and the second glass plate 17, and is connected to the third surface 171 of the second glass plate 17.

[0104] See also Figure 6 , Figure 6 for Figure 1 The cross-sectional schematic diagram of the third embodiment of the head-up display system shown in FIG. Figure 6 ] is a schematic cross-sectional view of the head-up display glass 10 on the left side of the central axis OO in the width direction, and thus the third diffraction layer is not shown.

[0105] In this embodiment, the structure of the head-up display glass 10 is different from that in the second embodiment described above in that the shielding layer 18 of the head-up display glass 10 is located between the first adhesive layer 15 and the second glass plate 17, and is connected to the third surface 171 of the second glass plate 17. Alternatively, the shielding layer 18 may also be located in the first adhesive layer 15, or the shielding layer 18 may also be located between the first adhesive layer 15 and the first glass plate 14, and is connected to the second surface 142 of the first glass plate 14.

[0106] The function display layer 19 is connected to the fourth surface 172 of the second glass plate 17. The function display layer 19 can be fixed to the second glass plate 17 by bonding with a transparent adhesive.

[0107] See also Figure 7 , Figure 7 for Figure 1 The schematic cross-sectional view of the fourth embodiment of the head-up display system shown in FIG. Figure 7 ] is a schematic cross-sectional view of the head-up display glass 10 on the left side of the central axis OO in the width direction, and thus the third diffraction layer is not shown.

[0108] In this embodiment, the difference from the head-up display glass 10 in the first embodiment is that in this embodiment, the first diffraction layer 191 includes a microlens array structure, and the microlens array structure can display 3D (Three Dimensions) images of augmented reality, so that the head-up display glass 10 can be used to display 3D images. Of course, in some embodiments, the second diffraction layer 192 also includes a microlens array structure for displaying 3D images such as road signs.

[0109] Specifically, the first diffraction layer 191 and the second diffraction layer 192 are both located between the second adhesive layer 16 and the second glass plate 17 , and connected to the third surface 171 of the second glass plate 17 .

[0110] The head-up display glass 10 further includes a light control layer 20. The light control layer 20 is located between the first adhesive layer 15 and the second adhesive layer 16, and is bonded and fixed by the first adhesive layer 15 and the second adhesive layer 16. The light control layer 20 is completely located in the shielding area 12 below the light-transmitting area 11. The projections of the light control layer 20 and the bottom shielding layer 181 along the thickness direction of the head-up display glass 10 are completely located in the shielding area 12 below the light-transmitting area 11.

[0111] The light control layer 20 is made of a light control layer. The light control layer can be a polymer dispersed liquid crystal film (PDLC), a suspended particle film (SPD), an electrochromic film (EC), a dye liquid crystal film (LC), etc. The light control layer can meet the requirements of visible light transmittance in multiple scenes. In this embodiment, the light control layer 20 has a shading effect, and the visible light transmittance of the light control layer 20 is less than or equal to 5%.

[0112] The shielding layer 18 has a hollow portion H. The hollow portion H is provided on the bottom shielding layer 181, and the hollow portion H penetrates two opposite surfaces in the thickness direction of the bottom shielding layer 181. Along the thickness direction of the head-up display glass 10, the projection of the hollow portion H is completely located within the projection of the first diffraction layer 191. The hollow portion H is used to allow people outside the vehicle 1000 to observe the image formed by the functional display layer 19. It can be understood that the hollow portion H is an opening opened in the thickness direction of the bottom shielding layer 181 to reduce the use of the bottom shielding layer 181 and reduce the difficulty of the printing process of the shielding layer 18. In addition, since the first glass plate 14 is a curved glass, the shielding layer 18 is provided with a hollow portion H, which can improve the bending quality of the first glass plate 14.

[0113] In this embodiment, along the thickness direction of the head-up display glass 10, the projection of the first diffraction layer 191 is completely located within the projection of the bottom shielding layer 181 and the light control layer 20. It can be understood that when the functional display layer 19 performs 3D image projection display, the bottom shielding layer 181 and the light control layer 20 together serve as the display background of the 3D display image, which not only better shields the light of the external environment of the vehicle 1000, and prevents the driver and passengers from being disturbed by the light of the external environment of the vehicle 1000 and unable to observe clear images, but also achieves a higher contrast and color gamut of the 3D display image, so that the driver and passengers can observe clear 3D display images.

[0114] In this embodiment, the projection area of ​​the light control layer 20 along the thickness direction of the head-up display glass 10 is greater than or equal to the projection area of ​​the hollow portion H of the bottom shielding layer 181 along the thickness direction of the head-up display glass 10, so as to prevent the projection light 31 from passing through the hollow portion H to the outside of the vehicle 1000. Preferably, the projection area of ​​the light control layer 20 along the thickness direction of the head-up display glass 10 is greater than the projection area of ​​the bottom shielding layer 181 along the thickness direction of the head-up display glass 10.

[0115] See also Figure 8 , Figure 8 for Figure 1 The fifth embodiment of the head-up display system is shown in FIG. Figure 8 ] is a schematic cross-sectional view of the head-up display glass 10 on the left side of the central axis OO in the width direction, and thus the third diffraction layer is not shown.

[0116] In this embodiment, the structure of the head-up display glass 10 is different from that of the head-up display glass 10 of the first embodiment in that the functional display layer 19 of the head-up display glass 10 is not only located in the bottom shielding area 121, but also covers the entire light-transmitting area 11. The functional display layer 19 also includes a light-transmitting layer 194, which is located in the light-transmitting area 11. Along the height direction of the head-up display glass 10, the light-transmitting layer 194 is arranged on the side of the second diffraction layer 192 away from the first diffraction layer 191, and is arranged on the side of the third diffraction layer 193 away from the bottom shielding layer 181. Along the thickness direction of the head-up display glass 10, the light-transmitting layer 194 is laminated and connected to the first bonding layer 15 and the second bonding layer 16. The light-transmitting layer 194 in this embodiment can be regarded as the part of the second diffraction layer 192 and the third diffraction layer 193 extending toward the top of the head-up display glass 10, so that when the head-up display glass 10 is observed from the appearance, there is no film boundary between the film layers, giving a good visual perception.

[0117] In this embodiment, the functional display layer 19 is a HOE film, which has an exposed portion and an unexposed portion. Among them, the light-transmitting layer 194 is the unexposed portion of the HOE film, and the first diffraction layer 191, the second diffraction layer 192 and the third diffraction layer are all exposed portions of the HOE film. The functional display layer 19 of this embodiment is additionally provided with a light-transmitting layer 194, and the light-transmitting layer 194 can completely cover the light-transmitting area 11, so as to better reflect the customizability of the size and area of ​​the functional display layer 19.

[0118] It should be noted that the light-transmitting layer 194 being located in the light-transmitting area 11 means that the main part of the light-transmitting layer 194 is located in the light-transmitting area 11. In some cases, the light-transmitting layer 194 may also extend into the bottom shielding area 121, that is, the main part of the light-transmitting layer 194 is located in the light-transmitting area 11, and the edge of the light-transmitting layer 194 is arranged in the bottom shielding area 121 to shield the film layer boundary where the light-transmitting layer 194 and the second diffraction layer 192 are connected, and the film layer boundary where the second diffraction layer 192 and the first diffraction layer 191 are connected, so as to ensure the aesthetics of the head-up display glass 10.

[0119] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A head-up display glass, characterized in that: The head-up display glass includes a light-transmitting area and a shielding area, wherein the shielding area is arranged around the circumference of the light-transmitting area and connected to the edge of the light-transmitting area; The head-up display glass also includes a glass body, a shielding layer and a functional display layer, the shielding layer is stacked on the glass body, the functional display layer is stacked on the glass body and partially stacked with the shielding layer, the shielding layer is completely located in the shielding area, the functional display layer has a diffraction grating, the functional display layer includes a first diffraction layer and a second diffraction layer, the first diffraction layer is located in the shielding area, the second diffraction layer is located in the light-transmitting area, and the focal length of the first diffraction layer is smaller than the focal length of the second diffraction layer.

2. The head-up display glass according to claim 1, characterized in that: The shielding area includes a bottom shielding area, and the bottom shielding area is located on one side of the height direction of the light-transmitting area; The shielding layer includes a bottom shielding layer, and the bottom shielding layer is completely located in the bottom shielding area. Along the thickness direction of the head-up display glass, the projection of the first diffraction layer is located in the projection of the bottom shielding layer.

3. The head-up display glass according to claim 1, characterized in that: The first diffraction layer and / or the second diffraction layer comprises a microlens array structure.

4. The head-up display glass according to claim 1, characterized in that: The functional display layer further includes a light-transmitting layer, and the light-transmitting layer is located in the light-transmitting area and is arranged on a side of the second diffraction layer away from the first diffraction layer.

5. The head-up display glass according to claim 2, characterized in that: The head-up display glass further includes a first projection area and a second projection area, the first projection area is completely located in the bottom shielding area, the first projection area includes a first sub-projection area and a second sub-projection area, the first sub-projection area is located on one side of the second sub-projection area in a width direction, The second projection area is completely located in the light transmission area, the second projection area includes a third sub-projection area and a fourth sub-projection area, the third sub-projection area is located at one side of the fourth sub-projection area in a width direction, and the third sub-projection area is connected to the first sub-projection area, and the fourth sub-projection area is connected to the second sub-projection area; Along the thickness direction of the head-up display glass, the projection of the bottom shielding layer is completely located in the first projection area, the projection of the first diffraction layer is completely located in the first sub-projection area, and the projection of the second diffraction layer is completely located in the third sub-projection area.

6. The head-up display glass according to claim 2, characterized in that: The glass body includes a first glass plate, a second glass plate and a first adhesive layer, the first adhesive layer is connected to the first glass plate and the second glass plate, the shielding layer is connected to the first glass plate and the first adhesive layer, and the functional display layer is connected to the first adhesive layer and the second glass plate.

7. The head-up display glass according to claim 2, characterized in that: The glass body comprises a first glass plate, a second glass plate and a bonding layer, the bonding layer is connected to the first glass plate and the second glass plate, the shielding layer is connected to the second glass plate and the bonding layer, and the functional display layer is connected to the surface of the second glass plate facing away from the first glass plate; Alternatively, the shielding layer is connected to the first glass plate and the bonding layer, and the functional display layer is embedded in the bonding layer; Alternatively, the shielding layer is connected to the first glass plate and the bonding layer, and the functional display layer is connected to the bonding layer and the second glass plate.

8. The head-up display glass according to claim 2, characterized in that: The head-up display glass also includes a light control layer, which is completely located in the bottom shielding area; along the thickness direction of the head-up display glass, the light control layer is located between the bottom shielding layer and the first diffraction layer, and the projection of the first diffraction layer is completely located within the projection of the bottom shielding layer and the light control layer.

9. The head-up display glass according to claim 8, characterized in that: The shielding layer includes a hollow portion, which is arranged on the bottom shielding layer and penetrates two surfaces of the bottom shielding layer in the thickness direction. Along the thickness direction of the head-up display glass, the projection area of ​​the light control layer is greater than or equal to the projection area of ​​the hollow portion.

10. The head-up display glass according to claim 8, characterized in that: The light control layer is a dimming film or a low-transmittance adhesive layer.

11. The head-up display glass according to claim 5, characterized in that: The functional display layer further comprises a third diffraction layer, a part of the third diffraction layer is located in the second sub-projection area, and another part of the third diffraction layer is located in the fourth sub-projection area; The first diffraction layer and the second diffraction layer are disposed on one side of the third diffraction layer in a width direction, and a focal length of the third diffraction layer is different from a focal length of the first diffraction layer and a focal length of the second diffraction layer.

12. The head-up display glass according to claim 11, characterized in that: The first diffraction layer, the second diffraction layer and the third diffraction layer are integrally formed.

13. The head-up display glass according to any one of claims 1 to 12, characterized in that: The functional display layer is a transparent film.

14. The head-up display glass according to any one of claims 1 to 12, characterized in that: The functional display layer is a single-layer structure or a sandwich structure. When the functional display layer is a single-layer structure, the functional display layer includes a holographic functional layer. When the functional display layer is a sandwich structure, the functional display layer includes a substrate, a full-system functional layer and a protective layer stacked in sequence.

15. The head-up display glass according to any one of claims 1 to 12, characterized in that: The shielding layer is made of a dark ink layer, and the surface roughness of the shielding layer is greater than or equal to 1 μm.

16. A head-up display system, used for head-up display of a vehicle, characterized in that: The head-up display system includes a projection device and a head-up display glass as described in any one of claims 1 to 15, the functional display layer of the head-up display glass is located on the side of the shielding layer facing the projection device, the projection device faces the head-up display glass and emits projection light to the head-up display glass, the projection light diffracts image information through the first diffraction layer and then emits the glass body to form a first image, and at the same time, the projection light diffracts the image information through the second diffraction layer and then emits the glass body to form a second image.

17. The head-up display system according to claim 16, characterized in that: When the head-up display glass further includes a third diffraction layer, the projection light is diffracted by the third diffraction layer and then emitted from the glass body to form a third image.

18. A vehicle, characterized in that: The vehicle includes a vehicle body and a head-up display system as described in claim 16 or 17, wherein the head-up display system is installed on the vehicle body, the head-up display glass is installed at an opening of the vehicle body, and the projection device is installed inside the vehicle body.

Images