Optical film and head-up display device

Abstract

The invention discloses an optical film and a head-up display device, the optical film is used for reducing ambient light incident to an image generation unit of the display device, the optical film comprises a substrate, a diffusion structure located on a first side of the substrate and a light enhancement structure located on a second side of the substrate, and the first side and the second side of the substrate are opposite; light output by the image generation unit enters from the side, provided with the diffusion structure, of the optical film and converges when exiting from the light enhancement structure, and the light output by the image generation unit is enhanced by the optical film; ambient light enters from the side, provided with the light enhancement structure, of the optical film, part of the ambient light is reflected by the surface of the light enhancement structure, and part of the ambient light transmitted through the light enhancement structure and the substrate is diffused by the diffusion structure to weaken the intensity and then enters the image generation unit. According to the optical film, the ambient light incident to the image generation unit is reduced, the temperature rise of the image generation unit is delayed, and the influence of a sunlight backward flowing phenomenon on the image generation unit is reduced.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an optical film and a head-up display device. Background Art

[0002] The car head-up display (HUD) is a visual assistance driving system that can provide the driver with key auxiliary driving information and project the driving information into a virtual image, which is displayed at a certain distance in front of the driver, so that the driver can obtain information such as vehicle speed, fuel level, real-time navigation, etc. in a head-on state, thereby avoiding the blind spot time caused by the driver lowering his head to check driving information, allowing the driver to concentrate more, so as to ensure and improve driving safety.

[0003] HUD is a technology that uses the principle of optical reflection to project the driving information projected by the picture generating unit (PGU) into the driver's field of view through the windshield. However, due to the reversible principle of the optical path, a large amount of sunlight is incident on the surface of the PGU through the optical path of the HUD, and when the magnification of the HUD with a concave mirror is too high, it will generate high temperature due to the focusing effect, which will cause the surface temperature of the PGU to rise or even burn the PGU. This is the backflow of sunlight, which seriously affects driving safety.

[0004] In response to the problem of sunlight backflow in HUD, the industry is in urgent need of relevant solutions to reduce the temperature of PGU and the risk of PGU burning. Summary of the invention

[0005] In view of this, the present invention provides an optical film and a head-up display device to reduce the influence of sunlight backflow on the image generation unit of the display device and effectively prevent the temperature of the image generation unit from rising sharply.

[0006] The present invention provides an optical film for reducing ambient light incident on an image generating unit of a display device, the optical film comprising a substrate, a diffusion structure located on a first side of the substrate, and a light enhancement structure located on a second side of the substrate, the first side of the substrate being opposite to the second side;

[0007] The light output by the image generating unit is incident from the side of the optical film provided with the diffusion structure, and converges when it is emitted by the light-enhancing structure, and the optical film enhances the light output by the image generating unit;

[0008] Ambient light is incident from the side of the optical film where the light enhancement structure is provided. Part of the ambient light is reflected by the surface of the light enhancement structure, and part of the ambient light transmitted through the light enhancement structure and the substrate is diffused by the diffusion structure to weaken the intensity before being incident on the image generation unit.

[0009] Based on the same inventive concept, the present invention further provides a head-up display device, comprising the optical film of the present invention.

[0010] Compared with the prior art, the optical film and head-up display device provided by the present invention achieve at least the following beneficial effects:

[0011] The optical film provided by the present invention is used to reduce the ambient light incident on the image generation unit of the display device. The optical film includes a substrate, a diffusion structure located on the first side of the substrate, and a light-enhancing structure located on the second side of the substrate, and the first side of the substrate is opposite to the second side; the light output by the image generation unit is incident from the side of the optical film provided with the diffusion structure, and converges when the light-enhancing structure is emitted, and the optical film enhances the light output by the image generation unit; the ambient light is incident from the side of the optical film provided with the light-enhancing structure, part of the ambient light is reflected by the surface of the light-enhancing structure, and part of the ambient light transmitted through the light-enhancing structure and the substrate is diffused and weakened by the diffusion structure before being incident on the image generation unit. The optical film can enhance the light intensity of the light output by the image generation unit and weaken the light intensity of the ambient light incident on the image generation unit by reasonably setting the position and structure of the diffusion structure and the light-enhancing structure, effectively reducing the ambient light incident on the image generation unit, delaying or inhibiting the temperature rise of the image generation unit, reducing the influence of the sunlight backflow phenomenon on the image generation unit, avoiding the problem of failure and burning of the image generation unit due to a sharp increase in temperature, and realizing the enhancement of the display effect of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a schematic diagram of a top view structure of an optical film provided by the present invention;

[0014] Figure 2 is along Figure 1 A schematic diagram of a cross-sectional structure along the middle section line AA′;

[0015] Figure 3 yes Figure 2 A schematic diagram of the propagation light path of the light output by the image generating unit corresponding to the optical film shown;

[0016] Figure 4 yes Figure 2 Schematic diagram of the propagation light path of the ambient light corresponding to the optical film shown;

[0017] Figure 5 is a schematic diagram of a top view of another optical film provided by the present invention;

[0018] Figure 6 is along Figure 5 A schematic diagram of a cross-sectional structure along the middle section line BB′;

[0019] Figure 7 yes Figure 6 A schematic diagram of the propagation light path of the light output by the image generating unit corresponding to the optical film shown;

[0020] Figure 8 yes Figure 6 Schematic diagram of the propagation light path of the ambient light corresponding to the optical film shown;

[0021] Fig. 9 is along Figure 1 Another schematic diagram of the cross-section structure of the middle section line AA′;

[0022] Fig.10 is a schematic diagram of a top view of another optical film provided by the present invention;

[0023] Fig.11 is along Fig.10 A schematic diagram of a cross-sectional structure along the center section line CC′;

[0024] Fig.12 is along Figure 1 Another schematic diagram of a cross-sectional structure of the middle section line AA′;

[0025] Fig.13 is a schematic diagram of a top view of another optical film provided by the present invention;

[0026] Fig.14 is along Fig.13 A schematic diagram of a cross-sectional structure along the middle section line DD′;

[0027] Fig.15 It is a structural schematic diagram of a head-up display device provided by the present invention;

[0028] Fig.16 yes Fig.15 A schematic diagram of the propagation light path of the light output by the image generation unit corresponding to the head-up display device shown;

[0029] Fig.17 yes Fig.15 Schematic diagram of the propagation light path of the ambient light corresponding to the head-up display device shown. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. It should be noted that the directional words such as "upper", "lower", "left", "right" and the like described in the embodiments of the present invention are described at the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is formed "on" or "under" another element, it can not only be directly formed "on" or "under" another element, but also indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second", etc. are only used for descriptive purposes and do not represent any order, quantity or importance, but are only used to distinguish different components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0032] The term “including” and its variations used in the present invention are open inclusions, that is, “including but not limited to.” The term “based on” means “based at least in part on.” The term “one embodiment” means “at least one embodiment.”

[0033] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish the corresponding contents, and are not used to limit the order or interdependence.

[0034] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0035] Figure 1 is a schematic diagram of a top view structure of an optical film provided by the present invention, Figure 2 is along Figure 1 A schematic diagram of a cross-section structure along the middle section line AA′. Figure 3 yes Figure 2 Schematic diagram of the propagation light path of the light output by the image generating unit corresponding to the optical film shown, Figure 4 yes Figure 2 The schematic diagram of the propagation light path of the ambient light corresponding to the optical film shown in FIG. Figure 1-Figure 4 As shown, the optical film is used to reduce the incident light to the image generating unit ( Figure 1-Figure 4The optical film comprises a substrate 10, a diffusion structure 20 located on a first side of the substrate 10, and a light-enhancing structure 30 located on a second side of the substrate 10, wherein the first side of the substrate 10 is opposite to the second side; the light output by the image generating unit is incident from the side of the optical film provided with the diffusion structure 20, and converges when the light-enhancing structure 30 is emitted, and the optical film enhances the light output by the image generating unit; the ambient light is incident from the side of the optical film provided with the light-enhancing structure 30, and part of the ambient light is reflected by the surface of the light-enhancing structure 30, and part of the ambient light transmitted through the light-enhancing structure 30 and the substrate 10 is diffused by the diffusion structure 20 to weaken the intensity and then incident to the image generating unit.

[0036] Specifically, the optical film includes a substrate 10, a diffusion structure 20 and a light-enhancing structure 30. The substrate 10 includes a first side and a second side that are opposite to each other, and the diffusion structure 20 is arranged on the first side of the substrate 10, and the light-enhancing structure 30 is arranged on the second side of the substrate 10, that is, the diffusion structure 20 and the light-enhancing structure 30 are respectively located on two sides of the substrate 10 that are opposite to each other. In addition, the light output by the image generating unit of the display device can be incident on the first side of the substrate 10 and emitted from the second side of the substrate 10. Based on the principle of reversible optical path, the ambient light (including sunlight) can be incident on the second side of the substrate 10 and emitted from the first side of the substrate 10. In other words, the light output by the image generating unit of the display device and the ambient light are opposite in the incident direction relative to the optical film. In this embodiment, no specific requirements and special limitations are made on the position of the image generating unit of the display device. The light output by the image generating unit is located in the area corresponding to the first side of the substrate 10, and the ambient light is located on the second side of the substrate 10. The drawings and descriptions are only taken as an example for drawing and description. By way of example, the display device may be a head-up display device or other equipment. In fact, the display device may be a device with sunlight backflow. The optical film can enhance the light intensity of the light output by the image generation unit and weaken the light intensity of the ambient light incident on the image generation unit by reasonably setting the positions of the diffusion structure 20 and the light-enhancing structure 30 and modulating the light.

[0037] In a specific embodiment, for the light output by the image generation unit, that is, Figure 3The incident light shown (the incident light is relative to the optical film, and the incident light is incident on one side of the optical film), the incident light can be incident from the side of the optical film provided with the diffusion structure 20, and converge when it is emitted from the side of the optical film provided with the light-enhancing structure 30, and the optical film can effectively enhance the illumination intensity of the light output by the image generating unit. Exemplarily, the diffusion structure 20 may not affect the propagation direction of the light output by the image generating unit, and sequentially emit the light output by the image generating unit to the substrate 10 and the light-enhancing structure 30. Exemplarily, the diffusion structure 20 may disperse the light output by the image generating unit and evenly project it to the substrate 10 and the light-enhancing structure 30. Exemplarily, the light-enhancing structure 30 may convert the more divergent light output by the image generating unit into a plane light with a relatively concentrated brightness, that is, the light output by the image generating unit is converged to enhance the brightness of the light output by the image generating unit. That is, the setting of the optical film will not affect the normal use of the image generating unit of the display device.

[0038] In another specific embodiment, for ambient light, that is, Figure 4 The incident light shown (the incident light is relative to the optical film, and the incident light is incident on one side of the optical film) is incident from the side of the optical film provided with the light-enhancing structure 30, part of the ambient light is reflected by the surface of the light-enhancing structure 30, and part of the ambient light is transmitted through the light-enhancing structure 30 and the substrate 10, and is emitted from the side of the optical film provided with the diffusion structure 20. Among them, since part of the ambient light can be reflected by the surface of the light-enhancing structure 30, the accumulation of ambient light on the surface of the light-enhancing structure 30 is suppressed, and the ambient light incident on the image generation unit is effectively reduced, thereby achieving the effect of blocking part of the ambient light incident on the image generation unit. In addition, the diffusion structure 20 can also diffuse part of the ambient light transmitted through the light-enhancing structure 30 and the substrate 10 to weaken the light intensity of this part of the ambient light, further reducing the light intensity of the ambient light incident on the image generation unit, delaying or suppressing the temperature rise of the image generation unit, and helping to achieve the purpose of reducing sunlight backflow. That is, the provision of the optical film can effectively solve the problem of the increase in the convergence temperature of the image generating unit of the display device during normal use due to ambient light.

[0039] According to the technical solution in the embodiment of the present invention, the optical film can both enhance the light intensity of the light output by the image generating unit and weaken the light intensity of the ambient light incident on the image generating unit by reasonably arranging the position and structure of the diffusion structure and the light-enhancing structure, thereby effectively reducing the ambient light incident on the image generating unit, delaying or suppressing the temperature rise of the image generating unit, reducing the influence of the sunlight backflow phenomenon on the image generating unit, avoiding the problem of failure and burning of the image generating unit due to a sharp increase in temperature, and realizing the enhancement of the display effect of the display device.

[0040] Optionally, Figure 5 is a schematic diagram of a top view of another optical film provided by the present invention, Figure 6 is along Figure 5 A schematic diagram of a cross-section structure along the middle section line BB′. Figure 7 yes Figure 6 Schematic diagram of the propagation light path of the light output by the image generating unit corresponding to the optical film shown, Figure 8 yes Figure 6 The schematic diagram of the propagation light path of the ambient light corresponding to the optical film shown in FIG. Figure 5-Figure 8 As shown, the optical film further includes a one-way light-transmitting material layer 40 disposed on a side of the light-enhancing structure 30 away from the substrate 10 , and the one-way light-transmitting material layer 40 is used to block and reflect ambient light.

[0041] Specifically, the optical film further includes a one-way light-transmitting material layer 40 disposed on a side of the light-enhancing structure 30 away from the substrate 10. Figure 7 As shown, the one-way light-transmitting material layer 40 may not affect the propagation direction of the light output by the image generating unit, that is, the one-way light-transmitting material layer 40 may transmit the converged light output by the image generating unit emitted through the light-enhancing structure 30. Figure 7 The light path diagram of the light enhancement principle of the light enhancement structure 30 is also schematically shown in FIG. The light enhancement structure 30 achieves the light enhancement effect through multiple reflections and refractions. Figure 7 The light in the middle left area has a smaller incident angle (for example, the incident angle is smaller than the total reflection angle), so there are both corresponding reflected light and corresponding refracted light. Figure 7 The left area in the middle shows only the propagation path of the corresponding reflected light, that is, the light of this part of the angle passes through the light enhancement structure 30 through repeated reflection, and about 50% of the incident light will be reused and refracted when passing through the output interface; Figure 7 The light in the middle area has a smaller incident angle (for example, the incident angle is smaller than the total reflection angle), so there are both corresponding reflected light and corresponding refracted light. Figure 7 Only the propagation path of the corresponding refracted light is shown in the middle area, that is, the light of this part of the angle is refracted once through the exit surface of the light-enhancing structure 30, and the refracted light can be increased by 40% to 70%; Figure 7 The incident angle of the light in the middle right area is greater than the total reflection angle, so it is refracted after total reflection, that is, the light of this angle is totally reflected by one exit surface of the light enhancement structure 30 and refracted by the other exit surface before exiting. It should be noted that Figure 7The transmission principle of light in the light enhancement structure 30 is only schematically shown, so the transmission process of light at different angles is shown at different prism positions. In the actual light transmission process, since each prism position has light at various angles, each prism position will undergo repeated reflection and refraction processes. In other words, when the light is incident from the side of the optical film with the diffusion structure 20 to the dielectric material of the optical film, part of the light can be refracted out, and the other part of the light is not refracted out, but reflected in the dielectric material of the optical film, and this part of the light will have a reduced reflection angle and refraction angle, and then refracted out to achieve a light enhancement effect.

[0042] And, illustratively, compared Figure 4 and Figure 8 From the propagation path of the ambient light shown, it can be concluded that the one-way light-transmitting material layer 40 can affect the propagation direction of the ambient light, that is, after the ambient light is incident on the one-way light-transmitting material layer 40, it is reflected and does not enter the image generation unit, thereby avoiding the accumulation of ambient light on the surface of the image generation unit. In other words, the one-way light-transmitting material layer 40 will not affect the display effect of the image generation unit of the display device, and can also play a role in blocking and reflecting ambient light, further reducing the internal temperature of the image generation unit, and avoiding the situation where the image generation unit is heated up sharply due to the ambient light entering the surface of the image generation unit.

[0043] In a specific embodiment, for the light output by the image generation unit, that is, Figure 7 The incident light shown can be incident from the side of the optical film provided with the diffusion structure 20, and emitted from the side of the optical film provided with the unidirectional light-transmitting material layer 40. The unidirectional light-transmitting material layer 40 can transmit and emit the light output by the image generating unit after the convergence through the light enhancement structure 30.

[0044] In another specific embodiment, for ambient light, that is, Figure 8 As shown in the incident light, the ambient light is incident from the side of the optical film provided with the one-way light-transmitting material layer 40, and the ambient light is reflected by the surface of the one-way light-transmitting material layer 40. In addition, part of the ambient light may be transmitted through the one-way light-transmitting material layer 40, the light-enhancing structure 30 and the substrate 10, and be emitted and scattered at the side of the optical film provided with the diffusion structure 20. That is, since the ambient light can be reflected by the surface of the one-way light-transmitting material layer 40, the accumulation of the ambient light on the surface of the one-way light-transmitting material layer 40 is suppressed, and the ambient light incident on the image generation unit is effectively reduced, thereby achieving the blocking effect of the ambient light incident on the image generation unit.

[0045] Further, continue to refer to Figure 5-Figure 8The one-way light-transmitting material layer 40 includes a one-way light-transmitting film 41 disposed on the surface of the light-enhancing structure 30. Or, Fig. 9 is along Figure 1 Another cross-sectional structure diagram of the middle section line AA′ is shown in Fig. 9 As shown, the one-way light-transmitting material layer 40 includes one-way light-transmitting particles 42 disposed inside the light-enhancing structure 30. Alternatively, Fig.10 is a schematic diagram of a top view of another optical film provided by the present invention. Fig.11 is along Fig.10 A schematic diagram of a cross-sectional structure of the center section line CC′, such as Fig.10 and Fig.11 As shown, the one-way light-transmitting material layer 40 includes one-way light-transmitting particles 42 disposed on the surface of the light-enhancing structure 30 .

[0046] Specifically, in one embodiment, Figure 5-Figure 8 The one-way light-transmitting material layer 40 shown includes a one-way light-transmitting film 41 disposed on the surface of the light-enhancing structure 30. By way of example, the one-way light-transmitting film 41 may cover the surface of the one side of the light-enhancing structure 30 away from the substrate 10. By way of example, the one-way light-transmitting film 41 may perform a planarization process on the surface of the one side of the light-enhancing structure 30 away from the substrate 10. In this embodiment, no specific requirements or special limitations are made on the thickness of the one-way light-transmitting film 41.

[0047] In another specific embodiment, Fig. 9 The one-way light-transmitting material layer 40 shown includes one-way light-transmitting particles 42 disposed inside the light-enhancing structure 30. For example, the one-way light-transmitting particles 42 may be embedded inside the light-enhancing structure 30. Alternatively, Fig.10 and Fig.11 The one-way light-transmitting material layer 40 shown includes one-way light-transmitting particles 42 disposed on the surface of the light-enhancing structure 30. Exemplarily, the one-way light-transmitting particles 42 may also be dispersed on the surface of the light-enhancing structure 30. This embodiment does not make specific requirements and special limitations on the dispersion density and specific positions of the one-way light-transmitting particles 42. It can be understood that the one-way light-transmitting particles 42 may be disposed inside the light-enhancing structure 30 or on the surface of the light-enhancing structure 30. In fact, in another specific embodiment, the one-way light-transmitting particles 42 may only be disposed inside the light-enhancing structure 30. In another specific embodiment, the one-way light-transmitting particles 42 may only be disposed on the surface of the light-enhancing structure 30. This embodiment will not be further illustrated one by one.

[0048] Optionally, continue to refer to Figure 2-Figure 4 , Figure 6-Figure 8 The diffusion structure 20 includes a diffusion substrate 21 and diffusion particles 22. Further, the diffusion particles 22 are located on the surface of the diffusion substrate 21. Or, Fig.12 is along Figure 1Another cross-sectional structure schematic diagram of the middle section line AA′ is as follows: Fig.12 As shown, the diffusion particles 22 are located inside the diffusion substrate 21 .

[0049] Specifically, in one embodiment, Figure 2 and Figure 6 The diffusion particles 22 shown are located on the surface of the diffusion substrate 21. Exemplarily, the diffusion substrate 21 can be located on the first side of the substrate 10, and the diffusion particles 22 can cover the surface of the diffusion substrate 21 on the side away from the substrate 10. Exemplarily, the diffusion particles 22 can be dispersed on the surface of the diffusion substrate 21. The diffusion substrate 21 can play a supporting role, and the diffusion particles 22 can diffuse the light. This embodiment does not make specific requirements and special limitations on the shape and distribution of the diffusion particles 22. When the ambient light transmitted through the substrate 10 passes through the diffusion substrate 21 and the diffusion particles 22, the diffusion particles 22 can cause the ambient light to be refracted, reflected and scattered, so as to achieve optical diffusion, and further weaken the light intensity of the ambient light incident on the image generation unit.

[0050] In another specific embodiment, Fig.12 The diffusion particles 22 shown are located inside the diffusion substrate 21. Exemplarily, the diffusion substrate 21 can be located on the first side of the base 10, and the diffusion particles 22 can be embedded inside the diffusion substrate 21. Exemplarily, the diffusion particles 22 can be dispersed inside the diffusion substrate 21. The diffusion substrate 21 can play a supporting role, and the diffusion particles 22 can diffuse the light. This embodiment does not make specific requirements and special limitations on the shape and distribution of the diffusion particles 22. When the ambient light transmitted through the substrate 10 passes through the diffusion substrate 21 and the diffusion particles 22, the diffusion particles 22 can cause the ambient light to be refracted, reflected and scattered, so as to achieve optical diffusion, further weakening the light intensity of the ambient light incident on the image generation unit. It can be understood that Figure 2 and Figure 6 The diffusion particles 22 shown are only located on the surface of the diffusion substrate 21. Fig.12 The diffusion particles 22 shown are only located inside the diffusion substrate 21. In fact, in another specific implementation, the diffusion particles 22 can be disposed on the surface of the diffusion substrate 21 as well as inside the diffusion substrate 21. This embodiment will not be described one by one.

[0051] Optionally, continue to refer to Figure 1 and Figure 2, along the first direction X, the projection of the light enhancement structure 30 on the first plane (YZ plane) is a sawtooth shape, the sawtooth shape includes a triangle shape, the first plane is perpendicular to the plane where the optical film is located, and the first plane is perpendicular to the first direction X, and the first direction X is parallel to the extension direction of a sawtooth in the sawtooth shape. Or, Fig.13 is a schematic diagram of a top view of another optical film provided by the present invention. Fig.14 is along Fig.13 A schematic diagram of a cross-sectional structure of the middle section line DD′, such as Fig.13 and Fig.14 As shown, along the first direction X, the projection of the light enhancement structure 30 on the first plane is a sawtooth shape, the sawtooth shape includes a rounded shape, the first plane is perpendicular to the plane where the optical film is located, and the first plane is perpendicular to the first direction X, and the first direction X is parallel to the extension direction of a sawtooth in the sawtooth shape.

[0052] Specifically, along the first direction X, the projection of the light enhancement structure 30 on the first plane is a sawtooth shape, the first plane is perpendicular to the plane where the optical film is located, and the first plane is perpendicular to the first direction X, and the first direction X is parallel to the extension direction of a sawtooth in the sawtooth shape. The first plane can be understood as a cross section of the light enhancement structure 30, that is, the first plane is parallel to the paper surface. Figure 2-Figure 4 All shown are projections of the optical film on the first plane. The sawtooth shape of the light-enhancing structure 30 can change the refraction or reflection angle of the light, that is, the sawtooth shape can effectively increase the brightness of the light output by the image generation unit. And, the second direction Y can be understood as the thickness direction of the light-enhancing structure 30, and the third direction Z can be understood as the horizontal extension direction of the light-enhancing structure 30.

[0053] In a specific embodiment, Figure 2 and Figure 6 The sawtooth shape of the light enhancement structure 30 shown is a triangle shape. Exemplarily, the extending direction of one sawtooth of the triangle shape is parallel to the first direction X. In another specific embodiment, Fig.14 The sawtooth shape of the light-enhancing structure 30 shown is a rounded shape. Exemplarily, the extending direction of one sawtooth of the rounded shape is parallel to the first direction X. It is understandable that the specific shape and size of the sawtooth shape can be reasonably set according to the refraction and reflection requirements of light, and this embodiment does not make specific requirements and special limitations here.

[0054] Optionally, continue to refer to Figure 1-Figure 14 The material of the light enhancement structure 30 includes resin material.

[0055] Specifically, the resin material is easy to shape, which is conducive to forming the sawtooth-shaped structure of the brightness enhancement structure 30 .

[0056] Optionally, continue to refer to Figure 1-Figure 14 , the light-enhancing structure 30 is attached to the surface of the second side of the substrate 10; the diffusion structure 20 is attached to the surface of the first side of the substrate 10. In this way, the substrate 10, the diffusion structure 20 and the light-enhancing structure 30 form a whole. Exemplarily, the substrate 10 and the diffusion structure 20 can be fixedly attached together by an adhesive material with excellent light transmittance such as organic silicone, acrylic resin, unsaturated polyester, polyurethane and epoxy resin. Exemplarily, the substrate 10 and the light-enhancing structure 30 can be fixedly attached together by an adhesive material with excellent light transmittance such as organic silicone, acrylic resin, unsaturated polyester, polyurethane and epoxy resin.

[0057] Optionally, continue to refer to Figure 1-Figure 14 The substrate 10 and the light enhancement structure 30 are made of the same material. Further, the substrate 10 and the light enhancement structure 30 are an integrated structure.

[0058] Specifically, the light-enhancing structure 30 is attached to the surface of the second side of the substrate 10, and the substrate 10 and the light-enhancing structure 30 can be made of the same material, and the substrate 10 and the light-enhancing structure 30 can be an integrated structure. In this way, the stability between the substrate 10 and the light-enhancing structure 30 can be further ensured, and the risk of peeling and falling off between the substrate 10 and the light-enhancing structure 30 can be avoided. Exemplarily, the light-enhancing structure 30 can be directly formed on the substrate 10 through steps such as mold making. Exemplarily, the material of the substrate 10 can include polyethylene terephthalate PET, polycarbonate PC, or polymethyl methacrylate PMMA, etc.

[0059] In another specific embodiment, the diffusion structure 20 is attached to the surface of the first side of the substrate 10, and the substrate 10 and the diffusion structure 20 can be composed of the same material, and the substrate 10 and the diffusion structure 20 can be an integrated structure. In this way, the stability between the substrate 10 and the diffusion structure 20 can be further guaranteed, and the risk of peeling and falling off between the substrate 10 and the diffusion structure 20 can be avoided. Exemplarily, the diffusion structure 20 can be directly formed on the substrate 10 through steps such as etching. It can be understood that in another embodiment, the diffusion structure 20 is attached to the surface of the first side of the substrate 10, and the light-enhancing structure 30 is attached to the surface of the second side of the substrate 10, and the substrate 10, the diffusion structure 20 and the light-enhancing structure 30 can all be composed of the same material, and the substrate 10, the diffusion structure 20 and the light-enhancing structure 30 can be an integrated structure. In this way, the stability between the substrate 10, the diffusion structure 20 and the light-enhancing structure 30 can be further guaranteed, and the risk of peeling and falling off between the substrate 10, the diffusion structure 20 and the light-enhancing structure 30 can be avoided. For example, the diffusion structure 20 can be directly formed on one side of the substrate 10 by etching or other steps, and the brightness enhancement structure 30 can be directly formed on the other side of the substrate 10 by etching or other steps, thereby omitting the step of attaching the diffusion structure 20 and the brightness enhancement structure 30 to the surface of the substrate 10.

[0060] Based on the same inventive concept, an embodiment of the present invention further provides a head-up display device. Fig.15 is a schematic diagram of the structure of a head-up display device provided by the present invention, such as Fig.15 As shown, the head-up display device includes any one of the optical films 100 provided in the embodiments of the present invention. Therefore, the head-up display device provided in the embodiments of the present invention has the corresponding beneficial effects of the optical film 100 provided in the embodiments of the present invention, which will not be described in detail here. Exemplarily, the head-up display device can be an electronic device such as a vehicle-mounted display device, which is not limited in the embodiments of the present invention.

[0061] Optionally, Fig.16 yes Fig.15 Schematic diagram of the propagation light path of the light output by the image generation unit corresponding to the head-up display device shown, Fig.17 yes Fig.15 Schematic diagram of the propagation light path of the ambient light corresponding to the head-up display device shown in FIG. Figure 15-17 As shown, the head-up display device further includes an image generation unit 200, and the optical film 100 is attached to the light-emitting surface of the image generation unit 200. The image generation unit 200 can generate images and control brightness. In addition, the head-up display device further includes at least one reflector 300. After the image light output by the image generation unit 200 is converged by the optical film 100, it is reflected by the reflector 300 and the windshield 400 and incident on the human eye.

[0062] Specifically, the reflector 300 includes a first curved reflector 301 and a second curved reflector 302. The image light output by the image generation unit 200 is converged by the optical film 100, and then reflected by the first curved reflector 301, the second curved reflector 302 and the windshield 400 in sequence before entering the human eye. Exemplarily, the first curved reflector 301 and / or the second curved reflector 302 may be free-form surface reflectors. The first curved reflector 301 and the second curved reflector 302 may reduce the aberration caused by the curvature of the windshield 400. The first curved reflector 301 and the second curved reflector 302 may also magnify the image. The windshield 400 may also magnify the image again, eliminate ghosting, and then reflect the image to the human eye, which is beneficial to improving the image display effect of the head-up display device. Exemplarily, Fig.16 It can be understood as a schematic diagram of the optical path of the light output by the image generation unit 200 after being reflected by the first curved reflector 301, the second curved reflector 302 and the windshield 400 in sequence and then incident on the human eye. Fig.17 It can be understood as a schematic diagram of the optical path of the ambient light incident on the image generation unit 200 after being reflected by the windshield 400, the second curved reflector 302 and the first curved reflector 301 in sequence. It can be clearly seen that the optical film 100 can converge the light output by the image generation unit 200 to enhance the brightness of the light output by the image generation unit 200. The optical film 100 can also block and reflect the ambient light, reducing the ambient light incident on the image generation unit 200. In addition, the optical film 100 can diffuse the transmitted ambient light to weaken the light intensity of the ambient light, further reducing the light intensity of the ambient light incident on the image generation unit 200. In this way, the influence of the sunlight backflow phenomenon on the image generation unit 200 is effectively solved, and the normal use of the head-up display device is also guaranteed.

[0063] It can be seen from the above embodiments that the optical film and head-up display device provided by the present invention achieve at least the following beneficial effects:

[0064] The optical film provided by the present invention is used to reduce the ambient light incident on the image generation unit of the display device. The optical film includes a substrate, a diffusion structure located on the first side of the substrate, and a light-enhancing structure located on the second side of the substrate, and the first side of the substrate is opposite to the second side; the light output by the image generation unit is incident from the side of the optical film provided with the diffusion structure, and converges when the light-enhancing structure is emitted, and the optical film enhances the light output by the image generation unit; the ambient light is incident from the side of the optical film provided with the light-enhancing structure, part of the ambient light is reflected by the surface of the light-enhancing structure, and part of the ambient light transmitted through the light-enhancing structure and the substrate is diffused and weakened by the diffusion structure before being incident on the image generation unit. The optical film can enhance the light intensity of the light output by the image generation unit and weaken the light intensity of the ambient light incident on the image generation unit by reasonably setting the position and structure of the diffusion structure and the light-enhancing structure, effectively reducing the ambient light incident on the image generation unit, delaying or inhibiting the temperature rise of the image generation unit, reducing the influence of the sunlight backflow phenomenon on the image generation unit, avoiding the problem of failure and burning of the image generation unit due to a sharp increase in temperature, and realizing the enhancement of the display effect of the display device.

[0065] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An optical film, characterized in that: Used to reduce ambient light incident on an image generating unit of a display device, the optical film comprises a substrate, a diffusion structure located on a first side of the substrate, and a light enhancement structure located on a second side of the substrate, wherein the first side of the substrate is opposite to the second side; The light output by the image generating unit is incident from the side of the optical film provided with the diffusion structure, and converges when it is emitted from the light-enhancing structure, and the optical film enhances the light output by the image generating unit; Ambient light is incident from the side of the optical film where the light enhancement structure is provided, part of the ambient light is reflected by the surface of the light enhancement structure, and part of the ambient light transmitted through the light enhancement structure and the substrate is diffused by the diffusion structure to weaken the intensity before being incident on the image generation unit.

2. The optical film according to claim 1, characterized in that: The optical film further comprises a one-way light-transmitting material layer disposed on a side of the light-enhancing structure away from the substrate, and the one-way light-transmitting material layer is used for blocking and reflecting ambient light.

3. The optical film according to claim 2, characterized in that: The one-way light-transmitting material layer includes a one-way light-transmitting film arranged on the surface of the light-enhancing structure, or one-way light-transmitting particles arranged inside or on the surface of the light-enhancing structure.

4. The optical film according to claim 1, characterized in that: The diffusion structure includes a diffusion substrate and diffusion particles.

5. The optical film according to claim 4, characterized in that: The diffusion particles are located on the surface of the diffusion substrate, or the diffusion particles are located inside the diffusion substrate.

6. The optical film according to claim 1, characterized in that: Along the first direction, the projection of the light-enhancing structure on the first plane is a sawtooth shape, and the sawtooth shape includes a triangle shape or a rounded shape. The first plane is perpendicular to the plane where the optical film is located, and the first plane is perpendicular to the first direction. The first direction is parallel to the extension direction of a sawtooth in the sawtooth shape.

7. The optical film according to claim 1, characterized in that: The material of the brightness enhancement structure includes resin material.

8. The optical film according to claim 7, characterized in that: The light enhancement structure is attached to the surface of the second side of the substrate; and the diffusion structure is attached to the surface of the first side of the substrate.

9. The optical film according to claim 1, characterized in that: The substrate and the brightness enhancement structure are made of the same material.

10. The optical film according to claim 9, characterized in that: The substrate and the brightness enhancement structure are an integrated structure.

11. A head-up display device, characterized in that: The optical film comprises any one of claims 1 to 10.

12. The head-up display device according to claim 11, characterized in that: Also included is an image generation unit; The optical film is attached to the light emitting surface of the image generating unit.

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