Head-up display device

Abstract

The utility model provides head-up display equipment. The head-up display equipment comprises a shell and an image source arranged in the shell, and a heat radiation film is arranged on the shell and at least close to a corresponding area of the image source, and is used for radiating heat generated by the image source to the outside.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of optical imaging, and particularly relates to a head-up display device. BACKGROUND

[0002] Head-up display (HUD) technology refers to a principle of optical reflection, which projects light emitted by an image source onto an imaging window (an imaging plate, a windshield, etc.), and reflects the light into an eyebox via the imaging window to form a virtual image. The virtual image can display information to be displayed, such as driving-related information such as vehicle speed, so as to avoid distraction caused by the driver looking down at the instrument panel during driving, thereby improving the driving safety factor and bringing a better driving experience.

[0003] The head-up display device needs to work within a certain temperature range, wherein a temperature of the image source that is too high will affect the display effect of the virtual image, and even cause damage to the head-up display device and even cause a fire. Therefore, it is necessary to maintain the HUD within a certain temperature range. SUMMARY

[0004] The present disclosure aims to at least solve one of the technical problems existing in the prior art, and provides a head-up display device.

[0005] The present disclosure provides a head-up display device, which comprises a housing, and an image source arranged in the housing; a heat radiation film is arranged on the housing and at least close to a corresponding region of the image source, and is used for radiating heat generated by the image source to the outside.

[0006] The heat radiation film completely covers the surface of the housing, or the heat radiation film is arranged on the surface of the housing close to the image source; or the surface of the housing in contact with the heat radiation film is a rough surface.

[0007] The heat radiation rate of the heat radiation film is greater than or equal to 0.5, or the heat radiation rate of the heat radiation film is 0.60-0.95, or the heat radiation rate of the heat radiation film is 0.6-0.8, or the heat radiation rate of the heat radiation film is 0.7-0.9, or the heat radiation rate of the heat radiation film is 0.85-0.95.

[0008] The heat radiation film comprises, in sequence from a direction away from the housing, an adhesive layer, a heat conduction layer and a protective layer.

[0009] The material of the adhesive layer is a pressure-sensitive adhesive; or,

[0010] The material of the heat conduction layer is selected from at least one of copper, aluminum and stainless steel; or,

[0011] The material of the protective layer is at least one of polyimide, copper, aluminum and stainless steel.

[0012] The heat radiation film comprises a plurality of layers of sub-radiation films stacked in a direction away from the shell.

[0013] The plurality of layers of sub-radiation films comprise a first sub-radiation film and a second sub-radiation film, and the thermal radiation rate of the first sub-radiation film is different from that of the second sub-radiation film; or,

[0014] The plurality of layers of sub-radiation films comprise a first sub-radiation film and a second sub-radiation film, the material of the first sub-radiation film is at least one of aluminum oxide, titanium oxide and silicon dioxide, and / or the material of the second sub-radiation film is at least one of aluminum oxide, titanium oxide and silicon dioxide; or,

[0015] The plurality of layers of sub-radiation films comprise a first sub-radiation film and a second sub-radiation film, and the thickness ratio of the first sub-radiation film to the second sub-radiation film is 2:1, 3:1 or 4:1.

[0016] The cooling circulation system is further fixed on the shell and used for leading out the heat generated by the image source.

[0017] The shell comprises a first cavity and a second cavity in communication with the first cavity, the image source comprises a display module and a backlight module, the display module is arranged in the first cavity, and the backlight module is arranged in the second cavity.

[0018] The heat radiation film is arranged in the first cavity, and the cooling circulation system is installed on the first cavity.

[0019] The cooling circulation system comprises an evaporation device and a condensation device, the evaporation device is arranged in the first cavity and used for cooling the display panel of the display module, and the condensation device is installed on the first cavity and used for leading out the heat generated by the image source.

[0020] The image source comprises a display module and a backlight module, and the head-up display device further comprises a heat sink.

[0021] At least a part of the heat sink is arranged outside the shell, the shell is provided with a heat transfer channel connected with the image source, the heat transfer channel is connected with the heat sink, and the heat sink comprises a plurality of fins arranged in parallel with each other.

[0022] The material of the fin is at least one of copper, aluminum and aluminum alloy; or,

[0023] The thickness of the fin is 0.5-2mm; or,

[0024] The spacing between the plurality of fins is 5-20 mm; or the spacing between the plurality of fins is 2-10 mm; or the spacing between the plurality of fins is 1-3 mm; or the spacing between the plurality of fins is 0.5-2 mm.

[0025] The image source includes a display module and a backlight module, and the head-up display device also includes a cooler;

[0026] The cooler is disposed on the housing, and the housing is provided with a heat transfer channel connected to the image source, and the heat transfer channel is connected to the cooler. Attached Figure Description

[0027] Figure 1 These are application illustrations of head-up display devices provided in some examples;

[0028] Figure 2 This is a schematic diagram of the structure of a head-up display device according to the first example of this disclosure;

[0029] Figure 3 This is a schematic diagram of the structure of the thermal radiation film of the head-up display device according to the first example of this disclosure;

[0030] Figure 4 This is a schematic diagram of the structure of the head-up display device according to the second example of this disclosure;

[0031] Figure 5 This is a schematic diagram of the structure of the thermal radiation film of the head-up display device according to the second example of this disclosure;

[0032] Figure 6 This is a schematic diagram illustrating the application of head-up display devices provided in some examples. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0035] Figure 1 These are some examples illustrating the application of head-up display (HUD) devices, which can be installed on vehicles, airplanes, ships, trains, and other modes of transportation. Figure 1 As shown, the head-up display device includes an image source 110 for outputting image light. The image source 110 includes a backlight module 112 and a display module 111 disposed on the light-emitting side of the backlight module 112. The backlight module 112 includes LED beads, and the light emitted by the backlight module 112 is incident on the display module 111. The display panel of the display module 111 is a liquid crystal display panel, which includes multiple pixel units. Each pixel unit includes multiple pixels, for example, each pixel unit includes red, green, and blue pixels; or, for example, each pixel unit includes red, green, blue, and white pixels. The display module 111 is used to convert the light from the backlight module 112 into image light. The windshield 200 of the vehicle is used to reflect the image light to the eye box area 300, so that when the observer's eyes are within the eye box area 300, they can see the image formed by the image light. At this time, the image seen by the observer is a virtual image 400 formed by the windshield 200 through reflection imaging. The observer can be a driver or a passenger. The observer can obtain the required vehicle information from the virtual image 400 in front of their line of sight, such as driving speed, fuel consumption, etc., or other information, such as images from virtual rearview mirrors or audio-visual entertainment images.

[0036] The eyebox region 300 of the head-up display device refers to a region where the eyes of an observer are located and the image output by the head-up display device can be observed. The eyebox region 300 has a certain size. Even if the eyes of the observer deviate from the center of the eyebox region 300 by a certain distance, such as in the up-down, left-right, and front-back directions, as long as the eyes are still within the eyebox region 300, the image output by the head-up display device can be observed.

[0037] Of course, it can be understood that in some embodiments, the head-up display device can further include magnifying elements, reflecting elements, and other optical elements. For example, the image light passes through the magnifying elements and is reflected to the windshield 200. The magnifying elements can be curved mirrors. In other embodiments, the image light emitted by the display module 111 directly propagates to the windshield 200, and the windshield 200 reflects the image light to the eyebox region 300, so that the observer can see the virtual image 400.

[0038] The inventors have found that if the temperature of the image source 110 in the head-up display device is too high, the display panel can burn out, that is, white spots appear on the display panel, thereby affecting the display effect of the virtual image 400. The heat of the head-up display device mainly comes from the backlight, the environment, and sunlight backflow. For example, when the backlight module 112 emits a large amount of heat, the temperature of the display panel can be too high and the display panel can be damaged. Moreover, the inside of the head-up display device is a relatively sealed space, and the image source 110 is not convenient to dissipate heat. For another example, when sunlight backflow occurs, a large amount of sunlight reaches the display panel and is absorbed by the display panel, causing the temperature of the display panel to rise. When the temperature of the display panel exceeds the bearing range of the polarizing film and liquid crystal materials of the display panel, the display panel can be inevitably damaged.

[0039] Therefore, the present disclosure provides a head-up display device. The heat radiation film 140 is arranged on the shell 120 of the head-up display device to radiate the heat generated by the image source 110 to the outside, so as to dissipate heat of the image source 110.

[0040] As shown in FIG. 1, Figure 2 The present disclosure provides a head-up display device. The head-up display device includes a shell 120 and an image source 110. The image source 110 is arranged in the shell 120. A heat radiation film 140 is arranged on the shell 120 at least near a corresponding region of the image source 110. The heat radiation film 140 is used to radiate the heat generated by the image source 110 to the outside.

[0041] By arranging the heat radiation film 140 on the shell 120 at least near the corresponding region of the image source 110, the heat generated by the image source 110 can be radiated to the outside. The heat radiation efficiency to the outside is improved, and the image source 110 can be dissipated in time. This is conducive to avoiding that the temperature of the display module 111 is too high and preventing the display panel from burning out, such as white spots, thereby affecting the display effect of the virtual image 400.

[0042] In the embodiments of the present disclosure, the heat radiation film 140 is arranged on the shell 120. Specifically, the heat radiation film 140 can be arranged on the inner surface of the shell 120 facing the image source 110 or the outer surface of the shell 120 facing away from the image source 110. The heat radiation film 140 can also be arranged on the inner surface of the shell 120 facing the image source 110 and the outer surface of the shell 120 facing away from the image source 110.

[0043] Further, in the embodiments of the present disclosure, when the heat radiation film 140 is arranged on the inner surface of the shell 120 facing the image source 110, the heat radiation film 140 is arranged on the shell 120 at least close to the corresponding area of the image source 110. It can be understood that the heat radiation film 140 can be arranged on a part of the inner surface of the shell 120 opposite to the image source 110, which is closer to the image source 110 than other areas of the inner surface of the shell 120. The heat radiation film 140 can also be arranged on the entire inner surface of the shell 120, that is, the heat radiation film 140 completely covers the inner surface of the shell 120.

[0044] Further, in the embodiments of the present disclosure, when the heat radiation film 140 is arranged on the outer surface of the shell 120 facing away from the image source 110, the heat radiation film 140 is arranged on the shell 120 at least close to the corresponding area of the image source 110. It can be understood that the heat radiation film 140 can be arranged on a part of the outer surface of the shell 120 opposite to the image source 110, which is closer to the image source 110 than other areas of the outer surface of the shell 120. The heat radiation film 140 can also be arranged on the entire outer surface of the shell 120, that is, the heat radiation film 140 completely covers the outer surface of the shell 120.

[0045] In the embodiments of the present disclosure, the specific arrangement position of the heat radiation film 140 on the shell 120 is not limited herein, as long as it can play a role in radiating the heat generated by the image source 110, which is within the protection scope of the present disclosure.

[0046] In the embodiments of the present disclosure, the heat radiation film 140 is arranged on the area of the shell 120 close to the image source 110, so that the heat generated by the image source 110 can be radiated outward in time through the heat radiation film 140, improving the heat radiation efficiency and avoiding the problem of screen burn such as white spot on the display panel caused by the high temperature of the display module 111, which affects the display effect of the virtual image 400.

[0047] In the embodiments of the present disclosure, the material of the shell 120 can be at least one of metal or plastic, wherein the metal can be copper, aluminum, iron, etc., and the plastic can be PP (Polypropylene), ABS (Acrylonitrile Butadiene Styrene), PC (Polycarbonate), etc., and of course, further, the plastic can be selected to have high thermal conductivity, such as a plastic material added with graphite or metal powder, etc.

[0048] In the embodiments of the present disclosure, at least the surface area of the shell 120 used to form the heat radiation film 140 can be roughened, that is, in the case that the heat radiation film 140 covers part of the surface of the shell 120, only the part can be roughened, so that the surface of the shell 120 in contact with the heat radiation film 140 can be a rough surface, so that the heat radiation film 140 and the surface of the shell 120 have stronger adhesion, improve the strength of the heat radiation film 140, and prevent the heat radiation film 140 from falling off. The roughening process can include sandblasting, electric spark, etc., which is not specifically limited herein. In the embodiments of the present disclosure, the heat radiation film 140 can have various shapes, for example, the heat radiation film 140 can be one or a combination of a square, a rectangle, a circle, and a sector. Regardless of the shape of the heat radiation film 140, the heat radiation film 140 itself can have an appropriate size, and the heat radiation film 140 and the image source 110 can have an appropriate distance. Reasonable design of the size of the heat radiation film 140 and the distance between the heat radiation film 140 and the image source 110 helps to fully radiate the heat generated by the image source 110 outward, helps to timely dissipate heat from the display module 111, and also does not cause resource waste due to the size of the heat radiation film 140 being too large, so that part of the heat radiation film 140 cannot receive the heat generated by the image source 110; and also does not cause the heat radiation film 140 to be unable to receive the heat generated by the image source 110 due to the distance between the heat radiation film 140 and the image source 110 being too large, so that the display module 111 cannot be timely dissipated, which is not conducive to the normal work of the display panel and the normal display of the virtual image 400.

[0049] In some examples, the area of the heat radiation film 140 is not less than 10 cm 2 , 15 cm 2 , etc., which is not specifically limited herein. By setting the heat radiation film 140 to have an appropriate size, the heat generated by the image source 110 can be radiated out in time, avoiding the temperature of the display module 111 being too high, and also achieving efficient use of the heat radiation film 140 and avoiding resource waste.

[0050] In other examples, the area of the heat radiation film 140 can also be not greater than 25 cm2 28cm 2 As long as the heat generated by the image source 110 can be radiated in time, and the temperature of the display module 111 is prevented from being too high, the efficient use of the heat radiation film 140 and the avoidance of resource waste are all within the protection scope of the embodiments of the present disclosure.

[0051] In some examples, the maximum distance between the heat radiation film 140 and the image source 110 is less than or equal to 100 mm. By controlling the distance between the heat radiation film 140 and the image source 110 within a certain range, the heat generated by the image source 110 can be radiated in time, and the temperature of the display module 111 is prevented from being too high, so that the virtual image 400 has good display effect.

[0052] In other examples, the maximum distance between the heat radiation film 140 and the image source 110 can also be less than or equal to 80 mm, 120 mm, or other numerical values, as long as the heat generated by the image source 110 can be radiated in time, and the temperature of the display module 111 is prevented from being too high, all of which are within the protection scope of the embodiments of the present disclosure. For example, the minimum distance between the heat radiation film 140 and the image source 110 is not more than 5 mm, 8 mm, and the like, which are not limited here.

[0053] In the embodiments of the present disclosure, the heat radiation film 140 needs to have a certain heat radiation rate, so as to ensure that the heat radiation film 140 can radiate the heat generated by the image source 110 in time. The heat radiation rate (or called emissivity) is the ability of an object surface to release energy in the form of radiation, and its value is equal to the ratio of the energy radiated by the object at a certain temperature to the energy radiated by a black body at the same temperature. The radiation rate of a black body is equal to 1, and the radiation rate of other objects is between 0 and 1. That is, the heat radiation film 140 with higher heat radiation rate has stronger heat radiation ability than the heat radiation film 140 with lower heat radiation rate.

[0054] In some examples, the heat radiation rate of the heat radiation film 140 is greater than or equal to 0.5. For example, the heat radiation rate of the heat radiation film 140 is 0.6-0.95, or the heat radiation rate of the heat radiation film 140 is 0.6-0.8, or the heat radiation rate of the heat radiation film 140 is 0.7-0.9, or the heat radiation rate of the heat radiation film 140 is 0.85-0.95, and the like. The heat radiation rate of the heat radiation film 140 can be designed according to specific products, which is not limited here.

[0055] In some examples, the heat radiation film 140 can be a single-layer film structure, or a multi-layer film structure, which is not limited here. In the subsequent exemplary description of the present disclosure, the heat radiation film 140 is taken as a multi-layer film structure for example, but this cannot constitute a limitation to the present disclosure.

[0056] In some examples, the material of the heat radiation film 140 can be a metal material, for example, at least one of copper, aluminum, stainless steel, or the like can be selected. The material of the heat radiation film 140 can also be a non-metal material, for example, PET (Polyethylene Glycol Terephthalate), or the like, which is not specifically limited herein.

[0057] In some examples, for the case that the heat radiation film 140 is a multi-layer film structure, the materials of the respective film layers can be the same or different, which is not specifically limited herein, and the specific structure is described in connection with the following examples.

[0058] Next, the structure of the head-up display device of the present disclosure is described in connection with specific examples, which cannot constitute a limitation to the present disclosure.

[0059] In a first example, as shown in FIG. 1, the present example provides a head-up display device, which includes a housing 120 and an image source 110, the image source 110 being arranged in the housing 120; wherein a heat radiation film 140 is arranged on the housing 120, at least near the corresponding region of the image source 110, the heat radiation film 140 being configured to radiate the heat generated by the image source 110 to the outside. Figure 2 As shown in FIG. 2, in this example, the heat radiation film 140 is a three-layer film structure, which includes, in sequence from the direction away from the housing 120, an adhesive layer 141, a heat conduction layer 142, and a protective layer 143.

[0060] Figure 3 In this example, the heat generated by the image source 110 reaches the heat radiation film 140 through heat radiation, heat convection, heat conduction, or the like, and is transferred in the respective film layers of the heat radiation film 140 in the direction away from the image source 110, and finally radiated out. In the case that the heat radiation film 140 is arranged on the inner surface of the housing 120, the heat generated by the image source 110 sequentially passes through the protective layer 143, the heat conduction layer 142, the adhesive layer 141, and finally radiates out through the housing 120; in the case that the heat radiation film 140 is arranged on the outer surface of the housing 120, the heat generated by the image source 110 sequentially passes through the housing 120, the adhesive layer 141, the heat conduction layer 142, and finally radiates out through the protective layer 143.

[0061] In some examples, the material of the adhesive layer 141 can include an adhesive polymer with high thermal conductivity, or an adhesive polymer in which particles of a material with high thermal conductivity are dispersed, or the like, for example, the material of the adhesive layer 141 is a pressure-sensitive adhesive, or a material containing a pressure-sensitive adhesive. The thickness of the adhesive layer 141 can be 1-10 μm, for example, 3 μm, 6 μm, 9 μm, or the like.

[0062] In some examples, the material of the adhesive layer 141 can include an adhesive polymer with high thermal conductivity, or an adhesive polymer in which particles of a material with high thermal conductivity are dispersed, or the like, for example, the material of the adhesive layer 141 is a pressure-sensitive adhesive, or a material containing a pressure-sensitive adhesive. The thickness of the adhesive layer 141 can be 1-10 μm, for example, 3 μm, 6 μm, 9 μm, or the like.

[0063] ​In some examples, the thermally conductive layer 142 can be attached to the surface of the housing 120 via the adhesive layer 141. The material of the thermally conductive layer 142 may include a metal, for example, at least one of copper, aluminum, and stainless steel; the material of the thermally conductive layer 142 may also include non-metals with high thermal conductivity. The thickness of the thermally conductive layer 142 may be 10-50 μm, for example, 12 μm, 24 μm, 39 μm, 45 μm, etc.

[0064] In some examples, the protective layer 143 may cover the surface of the thermally conductive layer 142. The material of the protective layer 143 may include non-metals, such as polyimide, etc., and the material of the protective layer 143 may also include metals, such as at least one of copper, aluminum, and stainless steel. The thickness of the protective layer 143 may be 10-30 μm, for example, 15 μm, 25 μm, etc.

[0065] In other examples, the thermal radiation film 140 may include more or fewer film layers, without specific limitations. For example, the material of the protective layer 143 is the same as that of the thermally conductive layer 142, that is, the protective layer 143 and the thermally conductive layer 142 are one film layer, rather than two film layers, so the thermal radiation film 140 is a two-layer film structure, namely the adhesive layer 141 and the thermally conductive layer 142.

[0066] In some examples, such as Figure 2 As shown, the head-up display device includes the aforementioned housing 120, image source 110, and thermal radiation film 140. The image source 110 is disposed inside the housing 120, and the thermal radiation film 140 is disposed on the housing 120, at least in the corresponding area close to the image source 110.

[0067] In this example, the housing 120 of the head-up display device includes a first cavity 121 and a second cavity 122, the second cavity 122 being in communication with the first cavity 121. The first cavity 121 and the second cavity 122 can each have appropriate shapes; for example, the first cavity 121 is a cuboid and the second cavity 122 is a cuboid (e.g., ...). Figure 2 (as shown), or, the first cavity 121 is a cylinder and the second cavity 122 is a cube, etc., without specific limitations here.

[0068] In this example, image source 110 includes display module 111 and backlight module 112. Display module 111 is disposed in first cavity 121, and backlight module 112 is disposed in second cavity 122; a thermal radiation film 140 is disposed in first cavity 121.

[0069] In this example, the display module 111 is arranged in the first cavity 121, and the heat radiation film 140 is arranged in the first cavity, so that the heat of the display module 111 can be radiated in time, the display module 111 is cooled, and the display panel is prevented from appearing white spots and other burn-in problems, which affect the display effect of the virtual image 400.

[0070] In some other examples, the display module 111 and the backlight module 112 can also be arranged in the first cavity 121 or the second cavity 122. Whether the display module 111 is arranged in the first cavity 121 or the second cavity 122, the heat radiation film 140 is arranged in the cavity where the display module 111 is arranged, so that the display module 111 can be cooled in time and effectively, and the display panel is prevented from appearing white spots and other burn-in problems caused by high temperature of the display module 111, which affect the display effect of the virtual image 400.

[0071] In some examples, the head-up display device not only includes the above structure, but also includes a cooling circulation system fixed on the shell 120, which is used to guide the heat generated by the image source 110 out.

[0072] In this example, by arranging the cooling circulation system, the heat generated by the image source 110 can be further quickly guided out, the display module 111 can be cooled in time, the temperature of the display module 111 is prevented from being too high, and the display panel is prevented from appearing white spots and other burn-in problems, which affect the display effect of the virtual image 400.

[0073] Further, the cooling circulation system can be, for example, an air cooling system, a liquid cooling system, etc. The air cooling system can include a radiator fan, a controller, etc. The radiator and the fan can be controlled by the controller to work, the heat generated by the image source 110 is absorbed by the radiator, and the heat absorbed by the radiator is carried away by the air flow generated by the fan, so that the heat generated by the image source 110 can be guided out in time. The liquid cooling system can include a cooling pipeline, a liquid cooling device, a controller, etc. The cooling medium in the cooling pipeline can flow and the liquid cooling device can work by the controller, the heat generated by the image source 110 is absorbed by the cooling medium in the cooling pipeline, and the cooling medium is cooled by the liquid cooling device, so that the heat generated by the image source 110 can be guided out in time.

[0074] Further, the cooling circulation system can be fixed on the outer surface of the shell 120, or can be partially fixed on the outer surface of the shell 120 and partially fixed on the inner surface of the shell 120, which is not limited here. For example, for the liquid cooling system, the cooling pipeline can be arranged in the shell 120, for example, fixed on the inner surface of the shell 120, or arranged around the image source 110, and the controller and the liquid cooling device can be arranged outside the shell 120, for example, fixed on the outer surface of the shell 120, so as to avoid the heat generated by them aggravating the burn-in problem of the display panel.

[0075] In some examples, the display module 111 is located in the first cavity 121, and the cooling circulation system is installed in the first cavity 121. This can further dissipate heat from the display module 111 in a timely manner, more effectively avoid the display module 111 from overheating, and prevent screen burn-in problems such as white spots on the display panel, which would affect the display effect of the virtual image 400.

[0076] In other embodiments, regardless of whether the display module 111 is located in the first cavity 121 or the second cavity 122, the cooling circulation system is installed on the cavity where the display module 111 is located, so as to achieve timely and effective heat dissipation of the display module 111, and prevent the display module 111 from overheating and causing white spots or other screen burn-in problems on the display panel, which would affect the display effect of the virtual image 400.

[0077] Continue to refer to Figure 2 In some examples, the cooling circulation system includes an evaporator and a condenser; the evaporator is disposed in the first cavity 121 for cooling the display panel of the display module 111; the condenser is mounted on the first cavity 121 for dissipating the heat generated by the image source 110.

[0078] In some examples, the evaporation device is located inside the first cavity 121, which can absorb the heat of the display module 111 at close range, thereby effectively preventing the display panel from overheating; the condensation device is installed on the first cavity 121 to dissipate the heat absorbed by the evaporation device.

[0079] In some examples, a refrigerant can be placed in the evaporator, which absorbs the heat of the display module 111 and evaporates, and then dissipates and condenses in the condenser, thereby realizing the heat removal of the display module 111.

[0080] In some examples, the cooling cycle system may also include a compressor, an expansion valve, and a circulation pipe 130. The refrigerant in the evaporator absorbs heat from the image source 110 and evaporates into a low-pressure, low-temperature gas, which enters the compressor through the circulation pipe 130. The compressor compresses the refrigerant from the low-pressure, low-temperature gas into a high-pressure, high-temperature gas, which then enters the condenser through the circulation pipe. In the condenser, a cooling fan helps dissipate heat from the refrigerant and condenses it into liquefaction. The liquefied refrigerant passes through the expansion valve, where its pressure and temperature decrease. The low-pressure, low-temperature refrigerant then enters the evaporator to continue absorbing heat generated by the display module 111, thus starting a new cycle.

[0081] In some examples, where the internal space of the head-up display device housing 120 is limited, small, efficient, and low-noise evaporators, condensers, compressors, and other equipment can be selected to improve the operational safety of each device, prevent refrigerant leakage, optimize the operating efficiency of each device, and reduce energy consumption.

[0082] In other examples, the head-up display device may also include a temperature detection device for detecting the temperature of the image source 110, particularly the temperature of the display module 111, and the ambient temperature inside the housing 120. When the temperature detected by the temperature detection device reaches a temperature threshold, the cooling circulation system is activated; when the temperature detected by the temperature detection device is below the temperature threshold, the cooling circulation system is shut down, thereby achieving rational and efficient use of energy and contributing to energy conservation and emission reduction.

[0083] The second example, such as Figure 4 As shown, this example provides a head-up display device, which includes a housing 120 and an image source 110, with the image source 110 disposed inside the housing 120; wherein, a thermal radiation film 140 is disposed on the housing 120 at least in a corresponding area near the image source 110, and the thermal radiation film 140 is used to radiate the heat generated by the image source 110 to the outside.

[0084] In some examples, the thermal radiation film 140 includes multiple sub-radiation films stacked in a direction away from the housing 120. For example, the thermal radiation film 140 may include two layers of sub-radiation films, four layers of sub-radiation films, etc., stacked in a direction away from the housing 120, and so on, without specific limitations. Different sub-radiation films may have different properties, such as different thermal emissivity, different heat resistance, different corrosion resistance, etc., so that the thermal radiation film 140 as a whole has multiple excellent properties, without specific limitations.

[0085] like Figure 5 As shown, in some examples, the thermal radiation film 140 is a two-layer film structure, which includes two sub-radiation films stacked in the direction away from the housing 120, namely a first sub-radiation film 144 and a second sub-radiation film 145, and the thermal emissivity of the first sub-radiation film 144 and the second sub-radiation film 145 is different.

[0086] In some examples, the thermal emissivity of the first sub-radiation film 144 and the second sub-radiation film 145 is different. That is, at a certain temperature, the wavelength range of infrared rays radiated by the first sub-radiation film 144 and the second sub-radiation film 145 is different. As a result, the thermal radiation film 140 as a whole can radiate infrared rays with a wider wavelength range, which is beneficial to further improve the thermal emissivity of the thermal radiation film 140.

[0087] In some examples, the material of the first sub-radiation film 144 can be a single material or a composite material, and the material of the second sub-radiation film 145 can be a single material or a composite material. The material of the first sub-radiation film 144 can be the same as or different from the material of the second sub-radiation film 145, which is not specifically limited herein. The single material can include ceramics, metal oxides, pigments, etc., such as alumina, titanium oxide, carbon black, and the like. The single material can also include silica, etc. The composite material can include a binder in which particles of a high-thermal-radiation material are dispersed, wherein the material of the binder can include a material that does not yellow and discolor due to heat, such as silicone resin, acrylic resin, polyurethane resin, polyester resin, fluororesin, etc., and the high-thermal-radiation material can be the above-mentioned ceramics, metal oxides, pigments, etc.

[0088] In a specific example, the material of the first sub-radiation film 144 is alumina, which radiates infrared light in a range of 2-10 μm at a temperature below 100°C, and the material of the second sub-radiation film 145 is titanium oxide, which radiates infrared light in a range of 5.6-1000 μm. The overall thermal radiation film 140 can radiate infrared light in a range of 2-1000 μm, thereby improving the thermal radiation rate of the overall thermal radiation film 140.

[0089] In some examples, the first sub-radiation film 144 and the second sub-radiation film 145 each have a certain thickness. For example, the thickness of the first sub-radiation film 144 can be 2 μm, 4 μm, 7 μm, etc., and the thickness of the second sub-radiation film 145 can be 3 μm, 4 μm, 6 μm, 8 μm, etc. The thickness of the first sub-radiation film 144 can be the same as or different from the thickness of the second sub-radiation film 145, which is not specifically limited herein.

[0090] In a specific example, the material of the first sub-radiation film 144 is alumina, and when the first sub-radiation film 144 is relatively thin, the amount of heat radiated is relatively low. Therefore, the thickness of the first sub-radiation film 144 made of alumina can be set to be greater than or equal to 3 μm, and can be set to be 3-10 μm, for example, 10 μm. The material of the second sub-radiation film 145 is titanium oxide, and the thickness of the second sub-radiation film 145 made of titanium oxide can be set to be 1-5 μm, for example, 3 μm.

[0091] In some examples, the thickness of the first sub-radiation film 144 can be greater than the thickness of the second sub-radiation film 145, and the ratio of the thickness of the first sub-radiation film 144 to the thickness of the second sub-radiation film 145 can be 2:1, 3:1, 4:1, etc., thereby allowing the thermal radiation film 140 composed of the first sub-radiation film 144 and the second sub-radiation film 145 to have a relatively high thermal radiation rate.

[0092] In a specific example, the material of the first sub-radiative film 144 is aluminum oxide, and the material of the second sub-radiative film 145 is titanium oxide. The thickness ratio of the first sub-radiative film 144 to the second sub-radiative film 145 can be 3:1, wherein the thickness of the first sub-radiative film 144 can be 10 μm, and the thickness of the second sub-radiative film 145 can be 3.33 μm, thereby making the thermal radiation film 140 composed of the first sub-radiative film 144 and the second sub-radiative film 145 have a high thermal emissivity.

[0093] In some examples, such as Figure 4 As shown, the head-up display device includes the aforementioned housing 120, image source 110, and thermal radiation film 140. The image source 110 is disposed within the housing 120, and the thermal radiation film 140 is disposed on the housing 120, at least in a corresponding area close to the image source 110. The image source 110 includes a display module 111 and a backlight module 112. The head-up display device also includes a heat sink 150.

[0094] In this example, the heat sink 150 can effectively dissipate heat and cool down the display module 111, preventing screen burn-in issues such as white spots on the display panel and affecting the display effect of the virtual image 400.

[0095] In some examples, at least a portion of the heat sink 150 is disposed on the outside of the housing 120, which has a heat transfer channel connected to the image source 110 and connected to the heat sink 150 to conduct heat away from the image source 110.

[0096] In some examples, the heat sink 150 may include an air-cooled heat sink 150, a water-cooled heat sink 150, etc. The air-cooled heat sink 150 may include, for example, a cooling fan that blows air onto the display module 111 to remove heat from the display module 111; the water-cooled heat sink 150 may include, for example, water-cooling pipes that surround the display module 111 to remove heat from the display module 111 by cooling water.

[0097] In other examples, an exhaust fan may also be provided on the housing 120 to ventilate the inside and outside of the housing 120 and to dissipate the heat absorbed by the radiator 150 in a timely manner.

[0098] In some examples, the shape of the heat sink 150 can be matched to the internal space of the housing 120 to make full use of the internal space of the housing 120 and to achieve sufficient contact with the display module 111 for good heat dissipation. Moreover, the gap between the heat sink 150 and the display module 111 can be filled with thermal grease to improve thermal conductivity.

[0099] In some examples, the material of the heat sink 150 can be a metal material such as copper, aluminum, aluminum alloy, or other material having heat conduction effect. Among them, aluminum has lighter weight, lower cost, and good heat conduction performance, and is an excellent material for the heat sink 150.

[0100] In some examples, the surface of the heat sink 150 can be subjected to an anodizing treatment or other coating treatment to improve the corrosion resistance and heat dissipation performance of the heat sink 150.

[0101] In some examples, the heat sink 150 includes a plurality of fins arranged in parallel with each other. By arranging a plurality of fins, the heat dissipation area of the heat sink 150 can be increased, and the heat dissipation efficiency can be improved. The plurality of fins can be arranged in a staggered manner to enhance the heat dissipation effect. The number of fins should be appropriate to achieve a balance between the heat dissipation effect and the air flow resistance.

[0102] Further, the plurality of fins can have an appropriate spacing therebetween, so that the air flows smoothly and has good heat dissipation effect. For example, the spacing between the plurality of fins can be 5-20 mm; or the spacing between the plurality of fins can be 2-10 mm; or the spacing between the plurality of fins can be 1-3 mm; or the spacing between the plurality of fins can be 0.5-2 mm; or the spacing between the plurality of fins can be 3-8 mm.

[0103] The heat dissipation mode of the fins can include natural convection heat dissipation, forced convection heat dissipation, etc. The spacing between the fins for natural convection heat dissipation can be greater than the spacing between the fins for forced convection heat dissipation. For example, for natural convection heat dissipation, the spacing between the fins can be 2-10 μm, or 3-8 μm; for forced convection heat dissipation, the spacing between the fins can be 1-3 μm.

[0104] Further, the fins can have an appropriate thickness to have higher structural stability and good heat conduction efficiency. For example, the thickness of the fins can be 0.5-2 mm, specifically 1 mm, 1.6 mm, etc. The fins can also have other thicknesses, which are not specifically limited herein.

[0105] Further, the length and width of the fins can be set according to the size of the space in the shell 120. The length of the fin can be the length of the longest side of the fin, and the width of the fin can be the length of the second longest side of the fin. The length of the fin can be 5-20 mm, and the width of the fin can be 3-10 mm. In other examples, the fins can also have other dimensions, which are not specifically limited herein.

[0106] Further, the fins can extend in a straight line in the length direction, extend in a wavy shape, or extend in a zigzag shape. By extending the fins in a curved shape, the surface area of the fins can be increased, thereby enhancing the heat dissipation effect of the fins. For example, the fins extending in a wavy shape can enhance the turbulent flow effect to some extent, thereby improving the heat dissipation efficiency.

[0107] Further, the fins can be made of metal materials or non-metal materials with good heat dissipation effect. For example, the material of the fins can be at least one of copper, aluminum, and aluminum alloy. The material of the fins can be aluminum alloy, which has good heat conduction performance and a high strength-to-weight ratio.

[0108] In some other examples, the heat sink can be replaced by a cooler. That is, the head-up display device includes the housing 120, the image source 110, and the heat radiation film 140 described above. The image source 110 is arranged in the housing 120, and the heat radiation film 140 is arranged on the housing 120 and at least close to the corresponding region of the image source 110. The image source 110 includes the display module 111 and the backlight module 112. The head-up display device further includes a cooler. The cooler is arranged on the housing 120. The housing 120 is provided with a heat transfer channel connected with the image source 110, and the heat transfer channel is connected with the cooler. By arranging the cooler, the heat generated by the image source 110 can be directly cooled, thereby achieving a more effective cooling effect on the image source 110.

[0109] In some embodiments, as shown in FIG. 1, Figure 6 The head-up display device can further include a reflective imaging element 160, which is arranged in the housing 120. The housing 120 protects the image source 110 and the reflective imaging element 160. The housing 120 has an opening 1211, so that the image light can be emitted from the opening 1211.

[0110] In some embodiments, the reflective imaging element 160 can include a magnifying element 161. The magnifying element 161 can enable the head-up display device to have a longer imaging distance and a larger imaging size. For example, the imaging distance and the imaging size can be changed by changing the magnification of the magnifying element 161. The magnification can be changed by adjusting the curvature and other parameters of the magnifying element 161.

[0111] In some embodiments, the magnifying element 161 can be a curved mirror, optionally a concave mirror, that is, a mirror with a concave curved reflecting surface. When the curved mirror is a concave mirror, if the optical distance between the image source 110 and the concave mirror is less than the focal length of the concave mirror, the concave mirror forms an upright, magnified virtual image 400 based on the image output from the image source 110. For example, according to the imaging properties of a concave mirror, when the optical distance between the image source 110 and the concave mirror is less than the focal length of the concave mirror (i.e., the image source 110 is within one focal length of the concave mirror), the image distance of the concave mirror increases as the optical distance between the image source 110 and the concave mirror increases. In other words, the greater the optical distance between the image source 110 and the concave mirror, the greater the distance between the observer and the virtual image 400 observed.

[0112] Optionally, the curved mirror is a free-form mirror, that is, a mirror with a free-form surface, or a surface that does not have rotational symmetry, in order to improve the imaging quality of the head-up display device.

[0113] In some alternative embodiments, the amplification element 161 may be an optical waveguide or a holographic optical element.

[0114] like Figure 6 As shown, the reflective imaging element 160 is not limited to including only the magnifying element 161, but may also include a plane mirror 162, which adjusts the optical path of image light propagation, thereby reducing the size of the head-up display device.

[0115] This disclosure also provides a vehicle including the head-up display (HUD) and windshield 200 described in the above embodiments. The windshield 200 reflects the image light emitted from the HUD to a preset area 300. The windshield 200 has a semi-transparent, semi-reflective characteristic, allowing the image light emitted from the HUD to be reflected to the preset area 300, while simultaneously allowing external light to pass through the windshield 200 and reach the preset area 300. This allows an observer's eyes, when positioned in the preset area 300, to simultaneously see both the image formed by the HUD and the external scenery. In this disclosure, "semi-transparent, semi-reflective" means that the windshield 200 can both transmit and reflect light, and is not limited to transmitting 50% and reflecting 50%. For example, the transmittance of visible light may be greater than or equal to 70%.

[0116] It is understood that the above embodiments are only exemplary for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A head-up display device comprising a housing, and an image source disposed within the housing; characterized in that, A heat radiation film is arranged on the shell, at least near the corresponding area of the image source, for radiating the heat generated by the image source to the outside.

2. The head-up display device of claim 1, wherein The heat radiation film completely covers the surface of the shell, or the heat radiation film is arranged on the surface of the shell near the image source; or the surface of the shell in contact with the heat radiation film is a rough surface.

3. The head-up display device of claim 1, wherein, The heat radiation rate of the heat radiation film is greater than or equal to 0.5; or the heat radiation rate of the heat radiation film is 0.60-0.95; or the heat radiation rate of the heat radiation film is 0.6-0.8; or the heat radiation rate of the heat radiation film is 0.7-0.9; or the heat radiation rate of the heat radiation film is 0.85-0.

95.

4. The head-up display device of claim 1, wherein, The heat radiation film comprises, in sequence away from the shell, an adhesive layer, a heat conduction layer and a protective layer.

5. The head-up display device of claim 4, wherein, The material of the adhesive layer is a pressure-sensitive adhesive.

6. The head-up display device of claim 1, wherein, The heat radiation film comprises a plurality of layers of sub-radiation films arranged in a stack away from the shell.

7. The head-up display device of claim 6, wherein The plurality of layers of sub-radiation films comprises a first sub-radiation film and a second sub-radiation film, and the heat radiation rates of the first sub-radiation film and the second sub-radiation film are different. Or, The plurality of layers of sub-radiation films comprises a first sub-radiation film and a second sub-radiation film, and the thickness ratio of the first sub-radiation film to the second sub-radiation film is 2:1, 3:1 or 4:

1.

8. The head-up display device according to any one of claims 1 to 7, characterized by, Further comprising a cooling circulation system fixed on the shell for leading out the heat generated by the image source; The shell comprises a first cavity and a second cavity in communication with the first cavity, the image source comprises a display module and a backlight module, the display module is arranged in the first cavity, and the backlight module is arranged in the second cavity; The heat radiation film is arranged in the first cavity; The cooling circulation system is mounted on the first cavity.

9. The head-up display device of claim 8, wherein, The cooling circulation system comprises an evaporation device and a condensation device; the evaporation device is arranged in the first cavity for cooling the display panel of the display module; and the condensation device is mounted on the first cavity for leading out the heat generated by the image source.

10. The head-up display device according to any one of claims 1 to 7, characterized by, The image source comprises a display module and a backlight module, and the head-up display device further comprises a heat sink; At least a part of the heat sink is arranged on the outside of the shell, the shell is provided with a heat transfer channel connected with the image source, the heat transfer channel is connected with the heat sink, and the heat sink comprises a plurality of fins arranged in parallel with each other.

11. The head-up display device of claim 10, wherein, The thickness of the fin is 0.5-2mm; or The spacing between the plurality of fins is 5-20mm; or the spacing between the plurality of fins is 2-10mm; or the spacing between the plurality of fins is 1-3mm; or the spacing between the plurality of fins is 0.5-2mm.

12. The head-up display device according to any one of claims 1 to 7, characterized by, The image source comprises a display module and a backlight module, and the head-up display device further comprises a cooler; The cooler is arranged on the shell, and the shell is provided with a heat transfer channel connected with the image source, and the heat transfer channel is connected with the cooler.

Images