Reflective optical film and vehicle-mounted display device

Abstract

The invention discloses a reflection optical film and a vehicle-mounted display device, and the film comprises a plurality of reflection modules, and each reflection module comprises a plurality of first reflection units and a plurality of second reflection units which are distributed in an array. Each first reflection unit has a first normal vector and is used for reflecting the image light emitted by the light source module to the first display area according to a first emitting direction determined based on the first normal vector; and each second reflection unit has a second normal vector and is used for reflecting the image light to the second display area according to a second emergent direction determined based on the second normal vector. According to the reflective optical film, through the design of normal vectors corresponding to each first reflection unit and each second reflection unit in each reflection module, the limitation of rotational symmetry of the reflective optical film is broken, so that each reflection module can efficiently distribute image light to a first display area and a second display area; and the light beam energy utilization rate of the reflection optical film is improved.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to a reflective optical film and a vehicle-mounted display device. Background Art

[0002] Reflective optical films are capable of reflecting the light beam emitted by a projection light source into its corresponding viewing window area for display. In related art, due to the rotational symmetry of reflective optical films, to adapt them to dual-window designs, diffusers with large diffusion angles are typically used to expand the viewing window area covered by the light spot reflected by the reflective optical film. However, traditional methods of expanding the viewing window cause a large amount of the light beam reflected by the reflective optical film to be projected outside the viewing window area, making it unable to efficiently distribute the light beam, resulting in low energy utilization of the reflective optical film. Summary of the Invention

[0003] In the first aspect, the present application proposes a reflective optical film, comprising: a plurality of reflective modules, each of the reflective modules comprising a plurality of first reflective units and a plurality of second reflective units distributed in an array; each of the first reflective units has a first normal vector, and each of the first reflective units is used to reflect the image light emitted by the light source module to a first display area according to a first emission direction corresponding to each of the first reflective units, and the first emission direction is a direction pointing to the first display area determined based on the first normal vector; each of the second reflective units has a second normal vector, and each of the second reflective units is used to reflect the image light emitted by the light source module to a second display area according to a second emission direction corresponding to each of the second reflective units, and the second emission direction is a direction pointing to the second display area determined based on the second normal vector.

[0004] Optionally, the first normal vector corresponding to each first reflecting unit bisects the first angle, the first angle is the angle formed by the intersection of the first line and the second line, the first line is the line formed by the center of the first reflecting unit and the center of the light source module, and the second line is the line formed by the center of the first reflecting unit and the center of the first display area; the second normal vector corresponding to each second reflecting unit bisects the second angle, the second angle is the angle formed by the intersection of the third line and the fourth line, the third line is the line formed by the center of the second reflecting unit and the center of the light source module, and the fourth line is the line formed by the center of the second reflecting unit and the center of the second display area.

[0005] Optionally, each of the first reflecting units and each of the second reflecting units includes a first surface and a second surface that are arranged opposite to each other, and the first surface is provided with a reflective film made of a reflective material, and the second surface is provided with a protective film made of a light-absorbing material.

[0006] Optionally, the first surface is a reflective plane, and the shape of the reflective plane is at least one of a triangle, a square, a rectangle and a hexagon; each of the reflective planes is used to reflect the image light to the first display area according to the emission angle of the first emission direction corresponding to each of the reflective planes; each of the reflective planes is used to reflect the image light to the second display area according to the emission angle of the second emission direction corresponding to each of the reflective planes.

[0007] Optionally, the first surface is a free-form surface, the shape of the free-form surface matches the shape of the first display area and the second display area, and the curvature of the free-form surface has a value range of (10W1, 20L1), wherein W1 is the width of the free-form surface and L1 is the length of the free-form surface; the free-form surface of each first reflection unit is used to reflect the image light to the first display area according to a first target emission angle, and the first target emission angle is within the set angle range in the first emission direction; the free-form surface of each second reflection unit is used to reflect the image light to the second display area according to a second target emission angle, and the second target emission angle is within the set angle range in the second emission direction.

[0008] Optionally, the multiple first reflection units and the multiple second reflection units are arranged adjacent to each other, and the number of the multiple first reflection units is equal to the number of the multiple second reflection units; the number of first reflection units in the multiple reflection modules matches the number of pixels displayed in the first display area, and the number of second reflection units in the multiple reflection modules matches the number of pixels displayed in the second display area.

[0009] Optionally, the reflective optical film further includes a diffusion layer, which is disposed on the surface of the multiple reflective modules; the diffusion layer is used to diffuse the image light reflected and output by the multiple reflective modules, and project the diffused image light to the first display area and the second display area respectively.

[0010] Optionally, the diffusion layer is provided with a rectangular diffusion film so that the spot shape of the image light after diffusion processing projected onto the target display area matches the shape of the target display area, and the target display area is the first display area or the second display area.

[0011] Optionally, the reflective optical film further includes a base layer, which is disposed between the plurality of reflective modules and the diffusion layer, and is configured to transmit the image light.

[0012] In the second aspect, the present application proposes a vehicle-mounted display device, comprising: a light source module and the above-mentioned reflective optical film: the light source module is used to emit image light; the reflective optical film is arranged in the light beam output direction of the light source module, and the reflective optical film is used to reflect the image light so as to reflect the image light to a first display area and a second display area respectively, the first display area being the main driver's window area of ​​the vehicle, and the second display area being the co-driver's window area of ​​the vehicle.

[0013] The reflective optical film provided in the present application includes: multiple reflective modules, each reflective module includes a plurality of first reflective units and a plurality of second reflective units distributed in an array; each first reflective unit has a first normal vector, and each first reflective unit is used to reflect the image light emitted by the light source module to the first display area according to the first emission direction corresponding to each first reflective unit, and the first emission direction is a direction pointing to the first display area determined based on the first normal vector; each second reflective unit has a second normal vector, and each second reflective unit is used to reflect the image light emitted by the light source module to the second display area according to the second emission direction corresponding to each second reflective unit, and the second emission direction is a direction pointing to the second display area determined based on the second normal vector. In this embodiment, the reflective optical film breaks the limitation of the rotational symmetry of the reflective optical film by designing the normal vectors corresponding to each first reflective unit and each second reflective unit in each reflective module, so that each first reflective unit can reflect the image light to the first display area according to the first emitting direction determined based on the first normal vector, and each second reflective unit can reflect the image light to the second display area according to the second emitting direction determined based on the second normal vector. The reflective optical film can efficiently distribute the image light, thereby avoiding the reflective optical film from projecting the image light outside the display area, and improving the energy utilization rate of the light beam by the reflective optical film.

[0014] These and other aspects of the present application will become more readily apparent from the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1A schematic structural diagram of a reflective optical film provided in one embodiment of the present application is shown.

[0017] Figure 2 Shows this application Figure 1 Schematic diagram of the structure of the reflection module provided.

[0018] Figure 3 Shows this application Figure 2 Schematic diagram of the target normal vector corresponding to the provided target reflection unit.

[0019] Figure 4 Shows this application Figure 1 A schematic diagram of the optical path of image light reflected by a reflective optical film is provided.

[0020] Figure 5 A schematic structural diagram of a target reflection unit provided in one embodiment of the present application is shown.

[0021] Figure 6 A schematic structural diagram of a target reflection unit provided in another embodiment of the present application is shown.

[0022] Figure 7 A schematic structural diagram of a reflective optical film provided in another embodiment of the present application is shown.

[0023] Figure 8 A schematic structural diagram of a vehicle-mounted display device provided in one embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] The terms "first," "second," and the like in this application are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0026] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] In a vehicle's head-up display (HUD), the system typically reflects important information, such as vehicle speed and navigation information, onto the driver's front viewing window via a reflective optical film. This allows the driver to view important driving information, such as vehicle speed and navigation, without having to lower or turn their head, thereby improving driving safety. However, when the driver is driving for long periods of time or is distracted, they may not pay attention to the corresponding vehicle driving information, which can easily lead to safety accidents. To ensure driving safety, related technologies typically include an additional projection light engine and a reflective optical film in front of the passenger seat to project the driving information onto the viewing window in front of the passenger seat, resulting in high device manufacturing costs. Alternatively, by enlarging the viewing window, a light beam emitted by a light source can be reflected simultaneously to the driver's and passenger's viewing windows. However, in this case, part of the light beam will be projected onto the area between the driver's and passenger's viewing windows, resulting in low energy utilization of the light beam by the reflective optical film.

[0028] Please refer to Figure 1 , Figure 1 The structure diagram of the reflective optical film 1 provided by an embodiment of the present application is shown below. Figure 1 The reflective optical film 1 provided in the embodiment of the present application is described in detail. Figure 1 As shown, the reflective optical film 1 of the present application includes a plurality of reflective modules 10 , and each reflective module 10 includes a plurality of first reflective units and a plurality of second reflective units distributed in an array.

[0029] In this embodiment, each reflective module 10 in the reflective optical film 1 includes multiple reflective units, and the multiple first reflective units in each reflective module 10 are used to reflect the image light emitted by the light source module to the first display area, and the multiple second reflective units in each reflective module 10 are used to reflect the image light emitted by the light source module to the second display area.

[0030] like Figure 2 As shown, Figure 2 Shows this application Figure 1A schematic structural diagram of a reflection module 10 is provided. In this embodiment, each reflection module 10 includes a plurality of first reflection units 11 and a plurality of second reflection units 12 distributed in an array, and the reflection performance of each reflection module 10 can be individually controlled through optical design.

[0031] Optionally, by designing the first normal vector corresponding to each first reflective unit 11 in each reflective module 10, the multiple first reflective units 11 in each reflective module 10 can have different first emission directions. Since the first emission direction corresponding to each first reflective unit 11 is a direction pointing to the first display area determined based on the first normal vector, each first reflective unit 11 can reflect the image light emitted by the light source module toward the first display area according to the first emission direction corresponding to each first reflective unit 11.

[0032] Optionally, by designing the second normal vector corresponding to each second reflective unit 12 in each reflective module 10, the multiple second reflective units 12 in each reflective module 10 can have different second emission directions. Since the second emission direction corresponding to each second reflective unit 12 is a direction pointing to the second display area determined based on the second normal vector, each second reflective unit 12 can reflect the image light emitted by the light source module to the second display area according to the second emission direction corresponding to each second reflective unit 12.

[0033] like Figure 3 As shown, Figure 3 Shows this application Figure 2 A schematic diagram of a target normal vector corresponding to the target reflection unit 13 is provided. The target reflection unit 13 can be a first reflection unit or a second reflection unit: if the target reflection unit 13 is the first reflection unit, the target normal vector corresponding to the target reflection unit 13 is the first normal vector; if the target reflection unit 13 is the second reflection unit, the target normal vector corresponding to the target reflection unit 13 is the second normal vector.

[0034] Optionally, a line formed by the center of the target reflective unit 13 and the center of the light source module 2 is a first target line, and a line formed by the center of the target reflective unit 13 and the center of the target display area 20 is a second target line. The first target line and the second target line intersect to form a target angle, and a target normal vector corresponding to the target reflective unit 13 bisects the target angle. The position of each target reflective unit 13 in the reflective optical film is fixed on the reflective optical film. Therefore, when the positions of the light source module 2 and the target display area 20 in space relative to the reflective optical film are fixed, the direction of the target normal vector corresponding to each target reflective unit 13 is fixed.

[0035] In this embodiment, if Figure 2As shown, the multiple first reflection units 11 and the multiple second reflection units 12 in each reflection module 10 are arranged adjacent to each other, and the number of the multiple first reflection units 11 is equal to the number of the multiple second reflection units 12, so each reflection module 10 can reflect the received image light emitted by the light source module 2 evenly and uniformly to the first display area and the second display area.

[0036] Optionally, the number of first reflection units 11 in the multiple reflection modules 10 matches the number of display pixels in the first display area, and each first reflection unit 11 is used to reflect image light onto the display pixel in its corresponding first display area; the number of second reflection units 12 in the multiple reflection modules 10 matches the number of display pixels in the second display area, and each second reflection unit 12 is used to reflect image light onto the display pixel in its corresponding second display area.

[0037] In this embodiment, by designing each reflective module 10 in the reflective optical film, that is, designing the emission directions of multiple first reflective units 11 and multiple second reflective units 12 in each reflective module 10, the limitation of the rotational symmetry of the reflective optical film is broken, so that the reflective optical film can have more design freedom.

[0038] like Figure 4 As shown, Figure 4 Shows this application Figure 1 Schematic diagram of the optical path of image light reflected by the reflective optical film. In this embodiment, each reflective module 10 in the reflective optical film 1 is used to reflect the image light emitted by the light source module 2 to reflect the image light to the first display area 21 and the second display area 22 respectively.

[0039] Optionally, each first reflective unit in any reflective module 10 has a first normal vector, and each first reflective unit is capable of reflecting image light emitted by the light source module 2 toward the first display area 21 according to the first emission direction corresponding to each first reflective unit. The first normal vector corresponding to each first reflective unit bisects a first angle, which is the angle formed by the intersection of a first connecting line and a second connecting line. The first connecting line is a line formed by the center of the first reflective unit and the center of the light source module 2, and the second connecting line is a line formed by the center of the first reflective unit and the center of the first display area 21. When the positions of the light source module 2 and the first display area 21 are fixed in space, the positions of the first reflective units arrayed in any reflective module 10 relative to the light source module 2 and the first display area 21 are different, resulting in different first normal vectors corresponding to the first reflective units arrayed in the reflective module 10. Each first reflective unit in the multiple reflective modules 10 corresponds to a display pixel in the first display area 21. By designing the first normal vector of each first reflective unit, each first reflective unit is capable of reflecting image light toward the display pixel corresponding to each first reflective unit.

[0040] Optionally, each second reflective unit in any reflective module 10 has a second normal vector, and each second reflective unit is capable of reflecting image light emitted by the light source module 2 toward the second display area 22 according to the second emission direction corresponding to each second reflective unit. The second normal vector corresponding to each second reflective unit bisects a second angle, which is the angle formed by the intersection of a third line and a fourth line. The third line is a line formed by the center of the second reflective unit and the center of the light source module 2, and the fourth line is a line formed by the center of the second reflective unit and the center of the second display area 22. When the positions of the light source module 2 and the second display area 22 are fixed in space, the positions of the second reflective units arranged in the array in any reflective module 10 relative to the light source module 2 and the second display area 22 are different, resulting in different second normal vectors corresponding to the second reflective units arranged in the array in the reflective module 10. Each second reflective unit in the plurality of reflective modules 10 corresponds to a display pixel in the second display area 22. By designing the second normal vector of each second reflective unit, each second reflective unit is capable of reflecting image light toward the display pixel corresponding to each second reflective unit.

[0041] In some embodiments, the reflective optical film 1 can be used in a vehicle's head-up display system, where the first display area 21 is the driver's window area, and the second display area 22 is the passenger's window area. This means that the head-up display system equipped with the reflective optical film 1 can not only project vehicle driving information onto the driver's front viewing window, but also provide the vehicle's driving information onto the passenger's front viewing window. Therefore, when the reflective optical film 1 provided in this embodiment is installed in a vehicle's head-up display system, the passenger in the passenger seat can view the vehicle's driving information without having to lower their head, making it easier for the passenger in the passenger seat to remind the driver of the vehicle's current driving information and ensuring driving safety. Moreover, by setting up the reflective optical film 1, when only one light source is used, by individually designing the reflective performance of each reflective module 10 in the reflective optical film 1, after the reflective optical film 1 reflects the image light, only the driver's and co-driver's window areas can receive the vehicle's driving information, thereby avoiding the image light from being projected to areas outside the two observation windows, improving the energy utilization rate of the light beam by the reflective optical film 1, and reducing the preparation cost of the head-up display system.

[0042] In this embodiment, the reflective optical film 1 includes: a plurality of reflective modules 10, each reflective module 10 includes a plurality of first reflective units and a plurality of second reflective units distributed in an array; each first reflective unit has a first normal vector, and each first reflective unit is used to reflect the image light emitted by the light source module to the first display area according to the first emission direction corresponding to each first reflective unit, and the first emission direction is a direction pointing to the first display area determined based on the first normal vector; each second reflective unit has a second normal vector, and each second reflective unit is used to reflect the image light emitted by the light source module to the second display area according to the second emission direction corresponding to each second reflective unit, and the second emission direction is a direction pointing to the second display area determined based on the second normal vector. Based on this, the reflective optical film 1 breaks the limitation of the rotational symmetry of the reflective optical film 1 by designing the normal vectors corresponding to each first reflective unit and each second reflective unit in each reflective module 10, so that each first reflective unit can reflect the image light to the first display area according to the first emitting direction determined based on the first normal vector, and each second reflective unit can reflect the image light to the second display area according to the second emitting direction determined based on the second normal vector. The reflective optical film 1 can efficiently distribute the image light, thereby avoiding the reflective optical film 1 from projecting the image light outside the display area, and improving the energy utilization rate of the light beam by the reflective optical film 1.

[0043] As an implementation, see Figure 5 , Figure 5A schematic structural diagram of a target reflection unit 13 provided in an embodiment of the present application is shown. The target reflection unit 13 may be a first reflection unit or a second reflection unit.

[0044] Optionally, each target reflection unit 13 in the reflection module 10 includes a first surface 131 and a second surface 132 arranged in opposite directions. The first surface 131 is provided with a reflection film made of a reflective material. The reflection film can be a metal reflection film formed by a metal reflective material, including but not limited to aluminum or silver. The reflection film can also be a multi-layer cut-off reflection film, which is not limited here. The second surface 132 is provided with a protective film made of a light-absorbing material, which is used to protect the reflection film and prevent the reflection film from being scratched. The light-absorbing material includes at least one of carbon black, iron oxide, aniline black, lamp black, and iron black. Among them, the first surface 131 of each target reflection unit 13 can be at least a reflection plane and a free-form surface, which is not limited here.

[0045] In this embodiment, the target reflection unit 13 includes a first surface 131 and a second surface 132 disposed opposite to each other, wherein the first surface 131 is a reflective plane. Each reflective plane is configured to reflect image light toward a target display area according to an emission angle corresponding to the target emission direction of each reflective plane. The reflective planes are shaped in at least one of a triangle, a square, a rectangle, and a hexagon.

[0046] Specifically, since the first surface 131 of the target reflection unit 13 is provided with a reflection film and is a reflection plane, when the image light projected by the light source module to the target reflection unit 13 is incident in parallel, the image light is reflected by the reflection plane of the target reflection unit 13 and will be emitted in parallel according to the emission angle of the target emission direction corresponding to the target reflection unit 13. The target normal vector corresponding to the target reflection unit 13 bisects the angle formed by the intersection of the target emission direction and the incident direction of the image light.

[0047] Optionally, for the multiple first reflective units in each reflective module 10, the reflective plane of each first reflective unit is used to reflect the image light to the first display area according to the emission angle of the first emission direction corresponding to each first reflective unit. For the multiple second reflective units in each reflective module 10, the reflective plane of each second reflective unit is used to reflect the image light to the second display area according to the emission angle of the second emission direction corresponding to each second reflective unit.

[0048] As an implementation, see Figure 6 , Figure 6 A schematic structural diagram of a target reflection unit 13 provided in another embodiment of the present application is shown. The target reflection unit 13 may be a first reflection unit or a second reflection unit.

[0049] In this embodiment, the target reflection unit 13 includes a first surface 131 and a second surface 132 disposed opposite to each other, and the first surface 131 is a free-form surface. The shape of the free-form surface matches the shape of the target display area, and the distance between each point on the free-form surface and the second surface 132 is z(x, y):

[0050]

[0051] Where c is the curvature radius of the free-form surface; r is k is the conic coefficient of the free-form surface; c j is the coefficient of the polynomial; m+n is the order of the polynomial. Moreover, when the target reflection unit 13 is the first reflection unit, the target display area is the first display area; when the target reflection unit 13 is the second reflection unit, the target display area is the second display area.

[0052] Optionally, since the first surface 131 of the target reflection unit 13 on which the reflection film is provided is a free-form surface, when the image light projected by the light source module onto the target reflection unit 13 is incident in parallel, after the image light is reflected by the free-form surface of the target reflection unit 13, the image light emitted from the free-form surface will not be emitted in parallel according to the emission angle of the target emission direction corresponding to the target reflection unit 13, but will be reflected to the target display area according to the target emission angle, and the target emission angle is within the set angle range on the emission direction corresponding to the target reflection unit 13.

[0053] Specifically, the free-form surface in the target reflection unit 13 can adjust the angle of incidence of the image light projected onto the free-form surface by the light source module, so that the free-form surface has a certain diffusion effect when reflecting the incident image light. By designing the reflective properties of the free-form surface, after the free-form surface reflects and diffuses the incident image light, the light spot formed by the image light projected onto the target display area by the free-form surface can match the shape of the target display area, thereby improving the efficiency of the image light reflected and output by the target reflection unit 13 and projecting it onto the target display area, and improving the display uniformity of the image light in the display area, thereby enhancing the user experience.

[0054] Optionally, the curvature of the free-form surface The value range of is within (10W1, 20L1), where W1 is the width of the free-form surface and L1 is the length of the free-form surface. That is, the curvature of the free-form surface is related to the size of the free-form surface itself. Therefore, by limiting the curvature of the free-form surface, the light spot of the image light projected to the target display area after the free-form surface diffuses the reflected image light can be better matched with the target display area. Based on this, it is possible to avoid the situation where the curvature of the free-form surface is too small and the free-form surface is too flat, resulting in the free-form surface being difficult to effectively diffuse the reflected image light. It is also possible to avoid the situation where the curvature of the free-form surface is too large and the free-form surface is nearly hemispherical, resulting in the light spot of the image light projected to the target display area after the free-form surface diffuses the reflected image light being too large, and part of the image light being projected outside the target display area, resulting in a loss of light energy.

[0055] Please refer to Figure 7 , Figure 7 The structure diagram of the reflective optical film 1 provided by another embodiment of the present application is shown below. Figure 7 The reflective optical film 1 provided in the embodiment of the present application is described in detail. Figure 7 As shown, the reflective optical film 1 of the present application includes a plurality of reflective modules 10 , and each reflective module 10 includes a plurality of first reflective units and a plurality of second reflective units distributed in an array.

[0056] In this embodiment, the reflective optical film 1 also includes a diffusion layer 30, which is arranged on the surface of multiple reflective modules 10. The diffusion layer 30 is used to diffuse the image light reflected and output by the multiple reflective modules 10, and project the diffused image light to the first display area and the second display area respectively.

[0057] Optionally, the diffusion layer 30 includes a rectangular diffusion film, and the rectangular diffusion film is formed from at least one of a volume diffusion material and a surface diffusion material. When the rectangular diffusion film diffuses the image light reflected and output by the multiple reflective modules 10, the diffusion angle of the rectangular diffusion film in the length direction of the first display area and the second display area is a first angle, and the diffusion angle of the rectangular diffusion film in the width direction of the first display area and the second display area is a second angle, with the first angle being greater than the second diffusion angle. Based on this, after the image light reflected and output by the multiple reflective modules 10 is diffused by the rectangular diffusion film, the spot shape of the image light emitted by the rectangular diffusion film when projected onto the target display area matches the shape of the target display area. That is, the spot shape of the image light in the target display area is the same as or similar to the target display area, and the target display area is the first display area or the second display area.

[0058] It should be noted that by setting the diffusion angle of the diffusion layer 30 in different emission directions according to the shape of the target display area, it is possible to avoid the situation where, when the diffusion angles of the diffusion layer 30 in different emission directions are equal or similar, the light spots of the image light in the first display area and the second display area after the diffusion layer 30 diffuses the image light, present a circular Gaussian or elliptical Gaussian energy distribution, that is, the image light presents a beam energy distribution with a brighter center and darker edges, resulting in poor light spot uniformity and a mismatch between the light spot shape and the shapes of the first display area and the second display area, leading to low utilization of the beam energy.

[0059] In this embodiment, when each first reflection unit and each second reflection unit in each reflection module 10 include a first surface and a second surface arranged opposite to each other, if the first surface coated with the reflective film is set as a free-form surface, the free-form surface of each first reflection unit and each second reflection unit can reflect and diffuse the image light emitted by the light source module, so that the spot shape of the image light on the diffusion layer 30 before the image light is diffused by the diffusion layer 30 matches the shape of the first display area and the second display area.

[0060] Based on this, when the diffusion layer 30 in the reflective optical film 1 is provided with a rectangular diffusion film, the diffusion layer 30 further diffuses the image light and improves the display uniformity of the image light in the first display area and the second display area. At the same time, it can also ensure that the spot shape of the image light projected onto the first display area and the second display area matches the shape of the corresponding display area, avoiding the image light from being projected outside the display area, thereby improving the utilization rate of the light beam energy.

[0061] Furthermore, by designing the reflective properties of the free-form surfaces, when the image light reflected by each free-form surface is projected onto the corresponding display area, the image light can evenly cover the first display area and the second display area before being diffused by the diffusion layer 30. Therefore, only a diffusion layer 30 with a smaller diffusion angle needs to be provided. The image light can be further diffused by the diffusion layer 30, thereby ensuring efficient utilization of the beam energy of the image light and improving the display uniformity of the image light in the first display area and the second display area.

[0062] In this embodiment, the reflective optical film 1 further includes a base layer 40 disposed between the plurality of reflective modules 10 and the diffusion layer 30. The base layer 40 is configured to transmit image light and is formed from a highly translucent material, including but not limited to polyethylene terephthalate, polyvinyl chloride, polycarbonate, acrylic, or glass. The plurality of reflective modules 10 can be formed from a highly translucent resin, including but not limited to polyacrylic acid, epoxy, or silicone, through a molding process, and the plurality of reflective modules 10 are disposed on the surface of the base layer 40.

[0063] In this embodiment, the reflective optical film 1 breaks the limitation of the rotational symmetry of the reflective optical film 1 by designing the normal vectors corresponding to each first reflective unit and each second reflective unit in each reflective module 10. When the first surface 131 of each first reflective unit and each second reflective unit is a free-form surface, the free-form surface can reflect and diffuse the image light emitted by the light source module, and make the spot shape of the image light match the shape of the first display area and the second display area. Based on this, when a diffusion layer 30 with a rectangular diffusion film having a small diffusion angle is provided, the diffusion layer 30 further diffuses the image light reflected and diffused by the multiple reflective modules 10, so that the image light is evenly distributed in the first display area and the second display area, and the spot shape of the image light matches the shape of the first display area and the second display area. Therefore, while ensuring that the beam energy of the image light is efficiently utilized, the display uniformity of the image light in the first display area and the second display area can be improved, thereby improving the user experience.

[0064] Please refer to Figure 8 , Figure 8 The structure diagram of the vehicle display device 3 provided by an embodiment of the present application is shown below. Figure 8 The vehicle-mounted display device 3 provided in the embodiment of the present application is described in detail. Figure 8 As shown, the vehicle-mounted display device 3 of the present application includes a light source module 2 and the reflective optical film 1 described in the above embodiment.

[0065] In this embodiment, the light source module 2 is configured to emit image light and includes, but is not limited to, a projector. A reflective optical film 1 is disposed in the light beam output direction of the light source module 2 and is configured to reflect the image light emitted by the light source module 2, thereby reflecting the image light toward the first display area 21 and the second display area 22, respectively.

[0066] Optionally, the vehicle-mounted display device 3 can be applied to the vehicle's head-up display system. In this case, the light source module 2 and the reflective optical film 1 in the vehicle-mounted display device 3 are both arranged on the vehicle's dashboard. In this case, the first display area 21 is the vehicle's main driver's window area, and the second display area 22 is the vehicle's main driver's window area.

[0067] In this embodiment, when the image light emitted by the light source module 2 is reflected by the reflective optical film 1, the reflective optical film 1 reflects the image light and outputs it to the reflective structures corresponding to the driver's window area and the passenger's window area on the vehicle's front windshield, respectively, so that the image light is reflected to the driver's window area and the passenger's window area, respectively. Based on this, when only one light source module 2 is used, the reflective optical film 1 reflects the image light, allowing the driver and passenger in the passenger seat to receive driving information without lowering or turning their heads, thereby improving driving safety.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A reflective optical film, characterized in that: The reflective optical film includes a plurality of reflective modules, each of which includes a plurality of first reflective units and a plurality of second reflective units distributed in an array; Each of the first reflecting units has a first normal vector, and each of the first reflecting units is configured to reflect the image light emitted by the light source module toward the first display area according to a first emission direction corresponding to each of the first reflecting units, where the first emission direction is a direction toward the first display area determined based on the first normal vector; Each second reflecting unit has a second normal vector, and each second reflecting unit is used to reflect the image light emitted by the light source module to the second display area according to the second emission direction corresponding to each second reflecting unit, and the second emission direction is a direction pointing to the second display area determined based on the second normal vector.

2. The reflective optical film according to claim 1, wherein A first normal vector corresponding to each first reflective unit bisects a first angle, where the first angle is an angle formed by the intersection of a first connecting line and a second connecting line, where the first connecting line is a connecting line formed by the center of the first reflective unit and the center of the light source module, and the second connecting line is a connecting line formed by the center of the first reflective unit and the center of the first display area; The second normal vector corresponding to each second reflecting unit bisects the second angle, the second angle is the angle formed by the intersection of the third line and the fourth line, the third line is the line formed by the center of the second reflecting unit and the center of the light source module, and the fourth line is the line formed by the center of the second reflecting unit and the center of the second display area.

3. The reflective optical film according to claim 1, wherein Each of the first reflecting units and each of the second reflecting units includes a first surface and a second surface that are arranged opposite to each other, and the first surface is provided with a reflecting film made of a reflective material, and the second surface is provided with a protective film made of a light-absorbing material.

4. The reflective optical film according to claim 3, wherein: The first surface is a reflective plane, and the shape of the reflective plane is at least one of a triangle, a square, a rectangle, and a hexagon; Each of the reflection planes is configured to reflect the image light to the first display area according to an emission angle of the first emission direction corresponding to each of the reflection planes; Each of the reflection planes is used to reflect the image light to the second display area according to the emission angle of the second emission direction corresponding to each of the reflection planes.

5. The reflective optical film according to claim 3, wherein: The first surface is a free-form surface, the shape of the free-form surface matches the shapes of the first display area and the second display area, and the curvature of the free-form surface is in the range of (10W1, 20L1), where W1 is the width of the free-form surface and L1 is the length of the free-form surface; The free-form surface of each first reflection unit is used to reflect the image light to the first display area according to a first target emission angle, and the first target emission angle is within a set angle range in the first emission direction; The free-curved surface of each second reflection unit is used to reflect the image light to the second display area according to a second target emission angle, and the second target emission angle is within the set angle range in the second emission direction.

6. The reflective optical film according to any one of claims 1 to 5, characterized in that: The plurality of first reflecting units and the plurality of second reflecting units are arranged adjacent to each other, and the number of the plurality of first reflecting units is equal to the number of the plurality of second reflecting units; The number of first reflection units in the plurality of reflection modules matches the number of display pixels in the first display area, and the number of second reflection units in the plurality of reflection modules matches the number of display pixels in the second display area.

7. The reflective optical film according to any one of claims 1 to 5, characterized in that: The reflective optical film further includes a diffusion layer, and the diffusion layer is disposed on the surfaces of the plurality of reflective modules; The diffusion layer is used to diffuse the image light reflected and output by the multiple reflection modules, and project the diffused image light to the first display area and the second display area respectively.

8. The reflective optical film according to claim 7, wherein: The diffusion layer is provided with a rectangular diffusion film so that the spot shape of the image light after diffusion processing projected onto the target display area matches the shape of the target display area, and the target display area is the first display area or the second display area.

9. The reflective optical film according to claim 7, wherein: The reflective optical film further includes a base layer, which is disposed between the plurality of reflective modules and the diffusion layer, and is configured to transmit the image light.

10. A vehicle-mounted display device, characterized in that: The vehicle-mounted display device comprises a light source module and the reflective optical film according to any one of claims 1 to 9: The light source module is used to emit image light; The reflective optical film is arranged in the light beam output direction of the light source module, and is used to reflect the image light so as to reflect the image light to a first display area and a second display area respectively. The first display area is the main driver's window area of ​​the vehicle, and the second display area is the co-driver's window area of ​​the vehicle.

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