Glass device and vehicle-mounted display system

Abstract

The utility model provides a glass device. The glass device comprises a first glass layer, a second glass layer and a Fresnel diaphragm located between the first glass layer and the second glass layer. The Fresnel diaphragm comprises a substrate and a microstructure layer, the microstructure layer is located on the surface, facing the first glass layer, of the substrate, and the microstructure layer is provided with a plurality of non-rotational-symmetry zigzag structures; the microstructure layer is used for reflecting and focusing part of the image light from the first glass layer to generate an image and transmitting the other part of the image light from the first glass layer, and the second glass layer is used for reflecting the other part of the image light. And the direction of the part of image light reflected by the microstructure layer is different from that of the other part of image light reflected by the second glass layer. According to the glass device, the problems of image ghosting and sunlight backward flowing can be solved on the basis of improving the universality. The utility model further provides a vehicle-mounted display system.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle-mounted augmented reality head up display (AR-HUD), and in particular to a glass device and a vehicle-mounted display system including the glass device. Background Art

[0002] Head Up Display (HUD) is used on space shuttles as an auxiliary driving device, the main purpose of which is to reduce the driver's frequent look down at the dashboard. In the field of car driving, HUD can project important information such as speed and navigation information onto the car's front windshield, which also reduces the driver's look down at the dashboard and improves driving comfort and safety. AR-HUD is a new type of HUD that combines augmented reality technology with head-up display technology. It combines the information projected onto the car's front windshield with the actual environment, which can enhance the information interaction experience between people and vehicles during driving and enhance the driving experience.

[0003] At present, AR-HUD is mainly divided into two categories. The first category uses holographic waveguides, and the second category uses traditional geometric optics. The holographic waveguide solution generates an image through the optical machine and transmits the image light to the front windshield through the waveguide plate, and then the front windshield reflects the image light into the driver's eyes. The traditional geometric optics solution projects the image light through the image generation unit, amplifies it through the reflective component, and projects it onto the front windshield, and finally reflects the image light into the driver's eyes through the front windshield.

[0004] For the solution using holographic waveguide, the overall volume of AR-HUD is small, but because it is based on diffraction technology, its efficiency is low, the brightness of the displayed picture is difficult to meet the requirements, and rainbow lines will appear on the picture. In addition, the process difficulty of waveguide plates and diffraction gratings is relatively complicated and expensive, which restricts its widespread use. For the solution using traditional geometric optics, in order to obtain a larger field of view, the size of the reflective component is large, and in order to obtain a larger virtual image distance, there is a longer optical path between the image generation unit and the front windshield, which leads to a larger overall volume of AR-HUD. In addition, since the optical path is reversible, when the external sunlight is transmitted in reverse along the optical path of AR-HUD, the reflective component will cause the sunlight to converge onto the image generation unit, causing the temperature of the surface of the image generation unit to rise, and even damage the image generation unit (that is, sunlight backflow). Furthermore, the above two implementation methods of AR-HUD both form images through reflection from the front windshield, and both solutions are also affected by image ghosting. Utility Model Content

[0005] A first aspect of the present application provides a glass device, comprising a first glass layer, a second glass layer, and a Fresnel film located between the first glass layer and the second glass layer;

[0006] The Fresnel film comprises a substrate and a microstructure layer, wherein the microstructure layer is located on a surface of the substrate facing the first glass layer, and the microstructure layer has a plurality of non-rotationally symmetric sawtooth structures;

[0007] The microstructure layer is used to reflect and focus a portion of the image light from the first glass layer to generate an image, and is used to transmit another portion of the image light from the first glass layer. The second glass layer is used to reflect the other portion of the image light. The direction of the portion of the image light reflected by the microstructure layer is different from that of the other portion of the image light reflected by the second glass layer.

[0008] In at least one embodiment of the present application, each of the sawtooth structures extends into an arc segment and bends in the same direction.

[0009] In at least one embodiment of the present application, each of the sawtooth structures has a light receiving surface for receiving the image light, the angle between the light receiving surface and the substrate is θ, the incident angle of the image light entering the light receiving surface is α, and the reflection angle of the portion of the image light reflected by the light receiving surface is α+2θ.

[0010] In at least one embodiment of the present application, the microstructure layer has positive optical power.

[0011] In at least one embodiment of the present application, the plurality of sawtooth structures extending into arc segments are distributed in concentric rings.

[0012] In at least one embodiment of the present application, the glass device has a blackened area, and the microstructure layer is located in the blackened area.

[0013] A second aspect of the present application provides a vehicle-mounted display system, comprising:

[0014] An image generating unit, configured to emit image light;

[0015] a reflector, located on an optical path of the image light, for reflecting the image light from the image generating unit; and

[0016] A glass device as described above, configured to receive and reflect at least a portion of the image light reflected by the reflector.

[0017] In at least one embodiment of the present application, the image generating unit has a display surface for emitting the image light, the reflector has a reflective surface for receiving and reflecting the image light, and an area of ​​the reflective surface is larger than an area of ​​the display surface.

[0018] In at least one embodiment of the present application, the reflector is a plane reflector.

[0019] In at least one embodiment of the present application, the image light is incident on the glass device at an incident angle ranging from 0 degrees to 30 degrees after being reflected by the reflector.

[0020] The above-mentioned glass device and vehicle-mounted display system, by setting a Fresnel membrane, part of the image light is reflected by the Fresnel membrane and focused into the eye box, while the other part of the image light passes through the Fresnel membrane, and after being reflected by the second glass layer, the light beam and the incident light beam are symmetrically distributed on both sides of the normal of the glass device, so that the image light reflected by the Fresnel membrane and the image light reflected by the second glass layer are not in the same direction. That is, the image light reflected by the second glass layer is not in the eye box, while the image light formed by the reflection of the Fresnel membrane is in the eye box, so the image observed by the driver in the eye box will not have double images. Furthermore, since the glass device includes a non-rotationally symmetric Fresnel membrane, the microstructure layer is only sensitive to image light with a specific incident angle, so the light with other incident angles incident from the outside of the vehicle (including sunlight and other types of stray light) will not be converged by the microstructure layer, so that the image generation unit inside the vehicle will not be affected by the backflow of sunlight, and the influence of stray light on the imaging quality of the image generation unit is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the vehicle display system of this application.

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the Fresnel membrane with a microstructure layer area.

[0023] Figure 3 It is a structural schematic diagram of a Fresnel film having a microstructure layer region formed therein in a modified embodiment of the present application.

[0024] Figure 4 This is a schematic structural diagram of a Fresnel film having a microstructure layer region in another modified embodiment of the present application.

[0025] Figure 5 Schematic diagram of the planar structure of a traditional complete Fresnel film.

[0026] Figure 6 A schematic diagram of an image light propagation path in a vehicle display system according to at least one embodiment of the present application.

[0027] Figure 7 It is a schematic diagram of the structure of the vehicle-mounted display system in the first comparative example.

[0028] Figure 8 It is a schematic diagram of the structure of the vehicle display system in the second comparative example.

[0029] Fig. 9 It is a schematic diagram of the structure of the vehicle display system in the third comparative example.

[0030] Main component symbols

[0031] Vehicle Display System1

[0032] Image generation unit 10

[0033] Reflector 20

[0034] Glass device 30

[0035] First glass layer 31

[0036] Second glass layer 32

[0037] Fresnel diaphragm 33

[0038] Base 331

[0039] Microstructure layer 332

[0040] Groove 333

[0041] Sawtooth structure 334

[0042] Protective film 335

[0043] PVB film 34, 303

[0044] Reflective surface S1

[0045] Display surface S2

[0046] Light receiving surface S3

[0047] First surface S4

[0048] Second surface S5

[0049] Image light L1, L11, L12, L2, L21, L22

[0050] Angle of incidence α

[0051] Angle θ

[0052] Eye box F

[0053] Fresnel film 2

[0054] Area 201

[0055] Car windshield 3

[0056] Inner glass 301

[0057] Outer glass 302

[0058] Optical Machine 4

[0059] Free-form mirrors 5, 6

[0060] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0061] The present application provides a glass device and a vehicle-mounted display system including the glass device. The vehicle-mounted display system is used to project image light onto the glass device, and the glass device is used to reflect the image light into the eyes of the driver. At the same time, the driver can also observe the actual environment of the vehicle through the glass device. Therefore, the above-mentioned vehicle-mounted display system allows the driver to observe the image displayed by the image light combined with the picture in the actual environment.

[0062] The above-mentioned glass device includes a Fresnel film, and the Fresnel film includes a substrate and a microstructure layer formed on the surface of the substrate. The microstructure layer includes a plurality of non-rotationally symmetrical sawtooth structures, so the Fresnel film is only sensitive to image light with a specific incident angle. That is, the Fresnel film will only reflect and focus image light with an incident angle within a specific angle range, and will not reflect and focus light with an incident angle within other angle ranges. This allows the Fresnel film to only reflect and focus specific image light into the driver's eye box, and prevent other image light from entering the eye box range, which can effectively improve the image ghosting problem of the display system. Furthermore, since the Fresnel film is only sensitive to image light with a specific incident angle, light from outside the vehicle (including sunlight and other stray light) will not be focused by the Fresnel film, so the above-mentioned glass device is also conducive to improving the problem of sunlight backflow.

[0063] In this embodiment, the above-mentioned vehicle-mounted display system is an AR-HUD, the above-mentioned glass device is the front windshield of the vehicle where the AR-HUD is located, and the image displayed by the above-mentioned image light may include navigation information, vehicle speed information, fuel level information, etc.

[0064] See also Figure 1 In this embodiment, the vehicle display system 1 includes an image generating unit 10, a reflector 20 and a glass device 30. The image generating unit 10 is used to emit image light L1. The reflector 20 is located on the optical path of the image light L1, and is used to reflect the image light L1 to the glass device 30. The glass device 30 is located on the side of the reflector 20 where the image light L1 is emitted, and is used to reflect the image light L1 into the driver's eye box F, so that the driver can simultaneously observe the actual environment of the vehicle and the image displayed based on the image light L1 through the glass device 30 (the virtual image P of the image is located in front of the glass device 30), that is, the driver can observe the AR image.

[0065] The image generation unit 10 may be a thin film transistor liquid crystal display (TFT-LCD), a digital light processing (DLP) display or a liquid crystal on silicon (LCOS) display. The image generation unit 10 may establish an electrical connection with a control device (not shown) in a wired or wireless manner, thereby receiving a control signal from the control device to display an image and emit image light L1. In this embodiment, the image generation unit 10 is a TFT-LCD, and the control device may be located at the center console of the vehicle where the vehicle display system 1 is located.

[0066] The reflector 20 has a reflective surface S facing the image generation unit 10. The reflective surface S can be a curved surface or a flat surface, that is, the reflector 20 can be a free-form reflector or a flat reflector. In this embodiment, the reflector 20 is a flat reflector, and the reflective surface S1 is a flat surface. The reflective surface S1 is used to reflect the image light L1 from the image generation unit 10 to the glass device 30.

[0067] Compared with the free-form surface reflector, the plane reflector is cheaper. The free-form surface reflector can optimize the image and compensate the display effect of the image on the Fresnel membrane 33 in advance. At the same time, it shares the optical focal length on the Fresnel membrane 33 and reduces the sensitivity of the Fresnel membrane 33 to the image, which can present a better image display effect.

[0068] By providing the reflector 20, the optical path of the image light L1 can be folded, and the image can be magnified in the limited space between the image generating unit 10 and the glass device 30. In this embodiment, the area of ​​the reflective surface S1 is larger than the area of ​​the display surface S2 from which the image generating unit 10 emits the image light L1, so as to receive as much image light L1 from the image generating unit 10 as possible, thereby improving the light utilization rate and the image brightness.

[0069] Please continue reading Figure 1 The glass device 30 includes a first glass layer 31, a second glass layer 32, and a Fresnel film 33 sandwiched between the first glass layer 31 and the second glass layer 32. The first glass layer 31 is located on the inner side, and the second glass layer 32 is located on the outer side. That is, when the glass device 30 is installed in a vehicle, the first glass layer 31 is closer to the driver than the second glass layer 32.

[0070] In this embodiment, the first glass layer 31, the second glass layer 32 and the Fresnel film 33 are structures that are bent toward the outside of the vehicle, and the degree of bending is small (that is, the curvature is small). In a small local area, the degree of bending of the first glass layer 31, the second glass layer 32 and the Fresnel film 33 can be ignored, and can be approximately regarded as a planar structure.

[0071] The first glass layer 31 is used to receive and transmit the image light L1 from the reflector 20. The Fresnel film 33 is used to reflect part of the image light L1 transmitted by the first glass layer 31 and adjust its reflection direction so that the first glass layer 31 is also used to transmit the image light L1 reflected by the Fresnel film 33 into the driver's eye box F. The Fresnel film 33 is also used to transmit part of the image light L1 transmitted by the first glass layer 31. The second glass layer 32 is used to reflect part of the image light transmitted by the Fresnel film 33.

[0072] See also Figure 2 The Fresnel film 33 includes a stacked substrate 331 and a microstructure layer 332 , wherein the microstructure layer 332 is located on a side of the substrate 331 close to the first glass layer 31 .

[0073] In this embodiment, the substrate 331 is a polyvinyl butyral (PVB) film, including a first surface S4 and a second surface S5 opposite to each other, the first surface S4 faces the first glass layer 31, and the microstructure layer 332 is directly formed on the first surface S4 of the PBV film, that is, the substrate 331 and the microstructure layer 332 are integrally formed. Moreover, the microstructure layer 332 is only formed on a partial area of ​​the first surface S4 of the substrate 331, and the partial area of ​​the first surface S4 of the substrate 331 where the microstructure layer 332 is not formed and the second surface S5 are directly in contact with the first glass layer 31 and the second glass layer 32, respectively, for fixing the first glass layer 31 and the second glass layer 32. In other implementations, the material of the Fresnel film 33 can also be other plastic materials other than PVB or glass.

[0074] See also Figure 3 In at least one modified embodiment of the present application, the glass device includes a Fresnel film 33 and a PVB film 34 independent of the Fresnel film 33, and the PVB film 34 and the Fresnel film 33 are sequentially stacked. In this modified embodiment, the PVB film 34 independent of the Fresnel film 33 does not constitute a base of the Fresnel film 33.

[0075] See also Figure 4 In at least one modified embodiment of the present application, the Fresnel film 33 may further include a protective film 335 covering the surface of the microstructure layer 332 to prevent the microstructure from being damaged.

[0076] In at least one modified embodiment of the present application, the glass device 30 is formed with a blackened area (not shown in the figure, usually the edge area close to the vehicle dashboard), and the microstructure layer 332 is located in the blackened area, that is, the orthographic projection of the microstructure layer 332 on the first glass layer 31 and the second glass layer 32 is covered by the blackened area, so that the image light L1 can be reflected more into the eye box F, presenting a better image display effect.

[0077] A plurality of arc-shaped grooves 333 are formed on one surface of the substrate 331, thereby forming a microstructure layer 332 including closely arranged and arc-shaped sawtooth structures 334. In this embodiment, the sawtooth structures 334 are arranged in concentric rings. When the image light L1 is incident on the surface of the microstructure layer 332, the surface shape of the sawtooth structure 334 can adjust the reflection angle of the image light L1 and focus the image light L1 within the range of the eye box F.

[0078] like Figure 5 The figure shows a planar structure of a conventional Fresnel film 2. The pattern of the microstructure layer 332 of this embodiment is equivalent to Figure 5 A rectangular area 201 cut out of the Fresnel film 2 shown in FIG. 3 is a rectangular area. That is, the projection of the microstructure layer 332 on the substrate 331 is a rectangular area. In other embodiments of the present application, the pattern of the microstructure layer 332 may be Figure 5 The Fresnel film 2 shown has other shaped regions cut out, such as a fan-shaped region, a circular region, etc. The shape of the microstructure layer 332 is adapted to the shape of the display region.

[0079] like Figure 5 The conventional Fresnel film 2 shown is a rotationally symmetrical structure, while the Fresnel film 33 in this embodiment is a part of a complete Fresnel film, which is a non-rotationally symmetrical structure. That is, each sawtooth structure in the conventional Fresnel film 2 is a complete ring, while in the microstructure layer 332 of the Fresnel film 33 in the embodiment of the present application, each sawtooth structure 334 only extends into an arc segment, and the bending direction of each sawtooth structure 334 is the same.

[0080] Please refer to Figure 2 In this embodiment, since the Fresnel diaphragm 33 is a non-rotationally symmetrical structure, it is only sensitive to the image light L1 having a preset incident angle range. That is, when the incident angle of the image light L1 when incident on the Fresnel diaphragm 33 is within the preset angle range, the Fresnel diaphragm 33 is used to reflect and focus the image light L11 into the above-mentioned driver's eye box F. If the incident angle of the image light L1 when incident on the Fresnel diaphragm 33 is outside the preset angle range, the Fresnel diaphragm 33 cannot focus the image light L1 into the driver's eye box F.

[0081] Each sawtooth structure 334 in the microstructure layer 332 has a light receiving surface S3, which is a plane and has an angle θ with the surface of the substrate 331. The light receiving surfaces S3 of each sawtooth structure 334 are parallel to each other and have an angle θ with the surface of the substrate 331.

[0082] See also Figure 6The incident angle α of the image light L1 incident on the microstructure layer 332 is defined as the angle between the light path of the image light L1 when it is incident on the microstructure layer 332 and the normal line of the glass device 30 (perpendicular to the surfaces of the first glass layer 31 and the second glass layer 32 facing the driver) l.

[0083] In this embodiment, the preset angle range is greater than 0 degrees and less than or equal to 30 degrees. That is, the Fresnel film 33 is only sensitive to the image light L1 with an incident angle α in the range of 0°-30°. When the incident angle α of the image light L1 is in the range of 0°-30°, the microstructure layer 332 can focus the image light L1 into the eye box F.

[0084] In this embodiment, when the image light L1 passes through the glass device 30, it is affected by the Fresnel film 33. The angle between the reflected light path of the image light L1 and the normal line l of the glass device 30 (i.e., the reflection angle of the image light L1) is 2θ+α. Part of the image light L1 is reflected by the Fresnel film 33 and focused into the eye box F. The other part of the image light L1 passes through the Fresnel film 33, and after being reflected by the second glass layer 32, the light beam (image light L12) and the incident light beam (image light L1) are symmetrically distributed on both sides of the normal line l of the glass device 30, so that the image light L11 reflected by the Fresnel film 33 and the image light L12 reflected by the second glass layer 32 are not in the same direction. That is, the image light L12 reflected by the second glass layer 32 is not in the eye box F, while the image light L11 formed by the reflection of the Fresnel film 33 is in the eye box F, so the image observed by the driver in the eye box F will not have double images.

[0085] For example, in at least one embodiment of the present application, the glass device 30 is installed in a vehicle as a front windshield. When the vehicle is placed on the ground, the angle between the glass device 30 and the ground is about 30°, and the angle of each sawtooth structure 334 in the Fresnel film 33 is 25°. By controlling the position of the reflector 20, when the incident angle of the image light L1 when incident on the glass device 30 is controlled to be 15°, after the image light L1 passes through the Fresnel film 33, the reflection angle of the image light L11 reflected by the Fresnel film 33 is 65°, and the reflected image light L11 is projected into the eye box F at an angle of 5° upward (that is, the angle between the image light L11 and the ground is 5°), and the image light L12 transmitted by the Fresnel film 33 and reflected by the second glass layer 32 is symmetrically distributed on both sides of the normal of the glass device 30 with the incident image light L1, and the image light L12 reflected by the second glass layer 32 is projected to other positions outside the eye box F at an angle of 45° downward (that is, the angle between the image light L11 and the ground is 45°).

[0086] Therefore, only the image formed by the image light L11 reflected by the Fresnel film 33 can be seen in the eye box F. In the embodiment of the present application, the Fresnel film 33 is arranged in the glass device 30 to adjust the focusing direction of the reflected image light, thereby effectively improving the image ghosting problem.

[0087] See also Figure 7 In a first comparative example, the vehicle windshield 3 includes an inner layer of glass 301, an outer layer of glass 302, and a PVB film 303 located between the inner layer of glass 301 and the outer layer of glass 302. The image light L2 emitted by the optical machine 4 is incident on the vehicle windshield 3 after being reflected by the free-form reflectors 5 and 6, and is reflected by the inner layer of glass 301 and the outer layer of glass 302 respectively. The directions of the image lights L21 and L22 reflected by the inner layer of glass 301 and the outer layer of glass 302 do not overlap, forming two completely identical but staggered patterns (i.e., double images) in the driver's eye box, affecting the driving experience.

[0088] See also Figure 8 In a second comparative example, the shape and thickness of the PVB film 303 inside the car windshield 3 are changed to improve the ghosting problem. Specifically, the PVB film 303 of equal thickness is changed into a wedge-shaped film with a thin bottom and a thick top, so as to adjust the angle at which the image light L2 is reflected by the outer glass 302, so that the virtual images reflected by the inner glass 301 and the outer glass 302 respectively overlap, thereby reducing the ghosting phenomenon.

[0089] However, the wedge-shaped PVB film 303 in the second comparative example needs to be customized for different models of vehicles (taking into account factors such as the transmission path of the image light in the vehicle and the installation position of the optical components). Completely eliminating ghosting requires a precise optical path and wedge angle, but in reality, the processing and installation errors of the device will make it difficult to eliminate ghosting, and the customization of the wedge-shaped film is also relatively expensive. Therefore, the solution of the second comparative example is difficult to be widely used.

[0090] See also Fig. 9 In a third comparative example, the polarization characteristics of light and the Brewster angle are used to improve the ghosting problem. Natural light has a random polarization direction, and the light in its random polarization direction can be decomposed into horizontally polarized light (P light) and vertically polarized light (S light). When the image light L3 is incident from the air to the surface of the inner glass 301 and the outer glass 302 at the Brewster angle, the reflectivity of the P light component on the glass surface is 0, and the S light component will be reflected by the inner glass 301 and the outer glass 302 respectively. At this time, both the inner glass 301 and the outer glass 302 reflect the image light, resulting in the existence of image ghosting.

[0091] In the third comparative example, an optical machine 4 that only generates P light is used to control the light beam to be incident on the car windshield 3 at a Brewster angle, and a layer of P light reflecting film is added to the PVB film 203 of the car windshield 3, so as to increase the brightness of the virtual image and eliminate ghosting.

[0092] However, the above solution requires an optical machine 4 that emits P light and a P light reflective film, and also requires a strict Brewster incident angle, which is difficult to meet for vehicles of different models, and also increases the design cost and difficulty of the vehicle display system.

[0093] It can be seen that in the second and third comparative examples above, specific windshields need to be customized for different vehicle models, and the customization requirements (such as wedge angle and Brewster angle) are strict and expensive.

[0094] In the glass device 30 of the present application, by providing a non-rotationally symmetric Fresnel film 33, it is possible to focus the image light L with a specific incident angle into the driver's eye box F, and reflect the image light L with other incident angles out of the driver's eye box F. That is, in the embodiment of the present application, although the Fresnel film 33 and the second glass layer 32 both reflect the image light, the Fresnel film 33 achieves separation of the image light beam by reflecting and focusing the image light with a specific incident angle, so that only the image light with a specific incident angle will be focused into the eye box F, which can effectively eliminate ghosting.

[0095] On this basis, the Fresnel membrane 33 of the embodiment of the present application has high versatility and does not need to be customized for different vehicle models, which simplifies the design difficulty of the glass device 30, reduces the cost of the glass device 30, and is conducive to wide application.

[0096] Furthermore, since the optical path is reversible, sunlight will converge to the image generating unit along the propagation path of the image light, generating a large amount of heat, causing the surface temperature of the image generating unit to rise, and in severe cases, the image generating unit may be burned.

[0097] In at least one pair of ratios, the above-mentioned sunlight backflow problem is improved by removing part of the heat energy of sunlight, for example, by removing the infrared spectrum of sunlight, or polarizing sunlight to block and weaken the energy of sunlight incident on the vehicle display system, thereby ensuring the safety of the image generation unit. However, due to the increasing field of view of AR-HUD, the size of the free-form surface reflector used in the vehicle display system has also increased, which makes the heat of sunlight concentrated on the surface of the image generation unit increase geometrically, making the protection plan for sunlight backflow more and more important.

[0098] In the embodiment of the present application, since the glass device 30 includes a non-rotationally symmetric Fresnel film 33, the Fresnel film 33 is only sensitive to image light with a specific incident angle. Therefore, light with other incident angles (including sunlight and other types of stray light) incident from the outside of the vehicle will not be converged by the Fresnel film 33, so that the image generation unit 10 inside the vehicle will not be affected by the backflow of sunlight, and the influence of stray light on the imaging quality of the image generation unit 10 is also reduced.

[0099] In addition, in the embodiment of the present application, the Fresnel diaphragm 33 itself has a positive optical focal length, and the vehicle-mounted display system 1 amplifies the image through the Fresnel diaphragm 33 and the reflector 20. Then the Fresnel diaphragm 33 shares the optical focal length on the reflector 20, and in the case of obtaining an image with the same magnification, fewer reflection levels are required in the embodiment of the present application. That is, since the Fresnel diaphragm 33 itself has an optical focal length and can assume the image magnification function, only one reflector 20 is required in the embodiment of the present application to enable the vehicle-mounted display system 1 to achieve a preset magnification. Therefore, the glass device 30 in the embodiment of the present application is conducive to reducing the reflection level in the optical path and reducing the size of the reflector 20. On the one hand, it is conducive to the overall miniaturization of the vehicle-mounted display system 1, and on the other hand, it has a larger tolerance for the installation accuracy of the device, and the accuracy requirements for the device installation are reduced, which is convenient for subsequent effect debugging.

[0100] Secondly, the reduction in the number of reflection levels reduces the amount of sunlight collected by the optical path, and the energy ultimately incident on the image generation unit 10 is reduced, making it less likely to generate high heat and damage the internal components of the image generation unit 10. The reduction in the size of the reflector 20 allows stray light in a small range to be guided to the image generation unit 10, while stray light in other ranges is less likely to be collected by the reflector 20. Therefore, the reduction in the number of reflection levels and the reduction in the size of the reflector 20 are also conducive to further improving the problem of sunlight backflow damaging the image generation unit 10 and the problem of stray light affecting the imaging quality.

[0101] In summary, the vehicle display system 1 and the glass device 30 of the embodiment of the present application can effectively solve the problems of image ghosting and sunlight backflow by setting a non-rotationally symmetric Fresnel film 33. On this basis, compared with the technical solution in the comparative example, the versatility of the glass device 30 can be further improved, the design difficulty can be simplified, the cost can be reduced, and it is conducive to being widely used.

[0102] Those skilled in the art should recognize that the above implementation modes are only used to illustrate the present application, and are not used as limitations on the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A glass device, characterized in that: It includes a first glass layer, a second glass layer and a Fresnel film located between the first glass layer and the second glass layer; The Fresnel film comprises a substrate and a microstructure layer, wherein the microstructure layer is located on a surface of the substrate facing the first glass layer, and the microstructure layer has a plurality of non-rotationally symmetric sawtooth structures; The microstructure layer is used to reflect and focus a portion of the image light from the first glass layer to generate an image, and is used to transmit another portion of the image light from the first glass layer. The second glass layer is used to reflect the other portion of the image light. The direction of the portion of the image light reflected by the microstructure layer is different from that of the other portion of the image light reflected by the second glass layer.

2. The glass device according to claim 1, characterized in that Each of the sawtooth structures extends into an arc segment and bends in the same direction.

3. The glass device according to claim 2, characterized in that The plurality of sawtooth structures extending into arc segments are distributed in concentric rings.

4. The glass device according to claim 1, characterized in that Each of the sawtooth structures has a light receiving surface for receiving the image light, the angle between the light receiving surface and the substrate is θ, the incident angle of the image light incident on the light receiving surface is α, and the reflection angle of the part of the image light reflected by the light receiving surface is α+2θ.

5. The glass device according to claim 1, characterized in that The microstructure layer has positive optical power.

6. The glass device according to any one of claims 1 to 5, characterized in that: The glass device has a blackened area, and the microstructure layer is located in the blackened area.

7. A vehicle-mounted display system, characterized in that: include: An image generating unit, configured to emit image light; a reflector, located on the optical path of the image light, and used to reflect the image light from the image generating unit; The glass device according to any one of claims 1 to 6, is used to receive and reflect at least part of the image light reflected by the reflector.

8. The vehicle-mounted display system according to claim 7, characterized in that: The image generating unit has a display surface for emitting the image light, and the reflector has a reflection surface for receiving and reflecting the image light, wherein an area of ​​the reflection surface is larger than an area of ​​the display surface.

9. The vehicle-mounted display system according to claim 7, characterized in that: The reflector is a plane reflector.

10. The vehicle-mounted display system according to claim 7, characterized in that: The image light is reflected by the reflector and incident on the glass device at an incident angle ranging from 0 degrees to 30 degrees.

Images