Head-up display device and traffic device

Abstract

The utility model provides head-up display equipment. The head-up display equipment comprises a first display panel, a second display panel and a light combination assembly, the light combination assembly comprises a transparent substrate, an antireflection film and a transflective film. The first display panel is configured to emit first image light rays towards the transflective film; the second display panel is configured to emit second image light rays towards the antireflection film; the light combining assembly is configured to reflect the first image light to form a first virtual image and transmit the second image light to form a second virtual image; wherein the antireflection film is configured to improve the transmittance of light rays with preset characteristics on the second surface; the first image light has the preset characteristic.

Description

TECHNICAL FIELD

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

[0002] Head-up display (HUD) technology refers to a principle of optical reflection, which projects light rays emitted by an image source onto an imaging window (an imaging plate, a windshield, etc.), and reflects the light rays 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 inventors have found that using a combining mirror in an imaging light path can cause ghosting in the virtual image. UTILITY MODEL CONTENT

[0004] The present application aims to at least solve the above technical problems in the prior art, and provides a head-up display device, comprising a first display panel, a second display panel and a combining assembly; characterized in that,

[0005] The combining assembly comprises a transparent substrate, an anti-reflection film and a transparent reflection film; the transparent substrate comprises a first surface and a second surface oppositely arranged along the thickness direction thereof; the transparent reflection film is arranged on the first surface, and the anti-reflection film is arranged on the second surface; the first display panel is configured to emit first image light rays towards the transparent reflection film; the second display panel is configured to emit second image light rays towards the anti-reflection film; and the combining assembly is configured to reflect the first image light rays to form a first virtual image, and transmit the second image light rays to form a second virtual image.

[0006] The anti-reflection film is configured to improve the transmittance of light rays having a preset characteristic on the second surface; and the first image light rays have the preset characteristic.

[0007] In some examples, the first image light rays and the second image light rays both have the preset characteristic; and the preset characteristic comprises a visible light wave band or three preset wave bands.

[0008] In some examples, the transmittance of the transparent reflection film to light rays having the preset characteristic is less than the reflectance, or the transmittance of the transparent reflection film and the anti-reflection film to light rays having the preset characteristic is less than the reflectance of the transparent reflection film to light rays having the preset characteristic; and the backlight brightness of the second display panel is greater than the backlight brightness of the first display panel.

[0009] In some examples, the transreflective film has a transmittance greater than a reflectance for light having the preset characteristic, or the transreflective film and the antireflection film together have a transmittance greater than a reflectance of the transreflective film for light having the preset characteristic; and the first display panel has a backlight brightness greater than a backlight brightness of the second display panel.

[0010] In some examples, the transreflective film has a transmittance less than a reflectance for infrared light, or the transreflective film and the antireflection film together have a transmittance less than a reflectance of the transreflective film for infrared light; and a first heat-conducting element is disposed on a light-outgoing side of the first display panel, the first heat-conducting element being configured to conduct heat away from the first display panel; or,

[0011] the transreflective film has a transmittance greater than a reflectance for infrared light, or the transreflective film and the antireflection film together have a transmittance greater than a reflectance of the transreflective film for infrared light; and a second heat-conducting element is disposed on a light-outgoing side of the second display panel, the second heat-conducting element being configured to conduct heat away from the second display panel; or,

[0012] the transreflective film has a transmittance equal to a reflectance for infrared light, or the transreflective film and the antireflection film together have a transmittance equal to a reflectance of the transreflective film for infrared light; and a first heat-conducting element is disposed on a light-outgoing side of the first display panel, and a second heat-conducting element is disposed on a light-outgoing side of the second display panel, the first heat-conducting element being configured to conduct heat away from the first display panel, and the second heat-conducting element being configured to conduct heat away from the second display panel.

[0013] In some examples, a first light-filtering element is disposed on a light-outgoing side of the first display panel, the first light-filtering element being configured to transmit light having the preset characteristic and reflect or absorb light not having the preset characteristic; and / or a second light-filtering element is disposed on a light-outgoing side of the second display panel, the second light-filtering element being configured to transmit light having the preset characteristic and reflect or absorb light not having the preset characteristic.

[0014] In some examples, the head-up display device further comprises at least one reflecting element; the first image light rays reflected by the light-combining assembly and the second image light rays transmitted by the light-combining assembly are incident to the at least one reflecting element, and are imaged by an external imaging device after being reflected by the at least one reflecting element;

[0015] The cutoff element is configured to reflect light having the preset characteristic, and transmit or absorb infrared light. The first image light and the second image light both have the preset characteristic, and the preset characteristic includes a visible light waveband or three preset wavebands.

[0016] In some examples, the head-up display device includes one of the reflective elements, which is a primary mirror. The primary mirror is a curved mirror. The cutoff element is arranged on a reflecting surface of the curved mirror, and the cutoff element includes an infrared transmission film or an infrared absorption film. Alternatively,

[0017] The head-up display device includes two of the reflective elements, which are a primary mirror and a secondary mirror. The first image light reflected by the light combination assembly and the second image light transmitted by the light combination assembly are sequentially reflected by the secondary mirror and the primary mirror, and then enter an external imaging device to form images. The primary mirror is a curved mirror. The secondary mirror is a curved mirror or a plane mirror. The cutoff element is arranged on a reflecting surface of the primary mirror and / or the secondary mirror, and the cutoff element includes an infrared transmission film or an infrared absorption film.

[0018] In some examples, the first heat-conducting element and the second heat-conducting element each include any one of polycarbonate, sapphire glass, alumina glass, high-silicon boron glass, ultra-white glass, silicate glass, aluminum-silicon glass, quartz glass, microcrystalline glass, spinel glass, graphene heat-conducting glass, indium tin oxide glass, and nano-composite heat-conducting glass.

[0019] In some examples, the first light filtering element and the second light filtering element each are selected from any one or more of an infrared reflection film, an infrared absorption film, a polarized reflection film, a polarized absorption film, and a preset waveband filtering film. Alternatively, the first light filtering element and the second light filtering element each include an infrared reflection film or an infrared absorption film, and further include any one or more of a polarized reflection film, a polarized absorption film, and a preset waveband filtering film.

[0020] The preset waveband filtering film is configured to transmit light having the three preset wavebands, and reflect or absorb light not having the three preset wavebands.

[0021] In some examples, the head-up display device further comprises a first heat dissipation element connected to the first heat conduction element, a first temperature sensor, and a first support; the first heat dissipation element is configured to dissipate heat conducted by the first heat conduction element; the first temperature sensor is configured to detect the temperature of the first display panel; the first support is configured to support the first display panel; the first temperature sensor is connected to at least one of the first support, the first heat conduction element, and the first heat dissipation element; and / or,

[0022] The head-up display device further comprises a second heat dissipation element connected to the second heat conduction element, a second temperature sensor, and a second support; the second heat dissipation element is configured to dissipate heat conducted by the second heat conduction element; the second support is configured to support the second display panel; the second temperature sensor is configured to detect the temperature of the second display panel; and the second temperature sensor is connected to at least one of the second support, the second heat conduction element, and the second heat dissipation element.

[0023] In some examples, the first heat conduction element is attached to the light-emitting surface of the first display panel, and the second heat conduction element is attached to the light-emitting surface of the second display panel.

[0024] In some examples, the first light filtering element is coated or attached to a surface of the first heat conduction element away from the light-emitting surface, and the second light filtering element is coated or attached to a surface of the second heat conduction element away from the light-emitting surface.

[0025] In some examples, the first temperature sensor is attached to a surface of the first heat conduction element away from the light-emitting surface, and / or the second temperature sensor is attached to a surface of the second heat conduction element away from the light-emitting surface.

[0026] In some examples, the included angle between the principal axis of the first image light reflected by the light combination assembly and the principal axis of the second image light transmitted by the light combination assembly is less than or equal to a preset angle; the preset angle is in the range of 0°-10°.

[0027] The utility model further provides a traffic equipment, including the head-up display device in above-mentioned embodiment. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of an example head-up display device;

[0029] Figure 2 It is a structural schematic diagram of a head-up display device provided by the embodiment of the disclosure;

[0030] Figure 3 A structure schematic diagram of a head-up display device provided by an embodiment of the present disclosure is provided;

[0031] Figure 4 A partial structure schematic diagram of a head-up display device provided by an embodiment of the present disclosure is provided;

[0032] Figure 5 A structure schematic diagram of a first display panel provided by an embodiment of the present disclosure is provided;

[0033] Figure 6 A structure schematic diagram of a first display panel provided by an embodiment of the present disclosure is provided;

[0034] Figure 7 A structure schematic diagram of a head-up display device provided by an embodiment of the present disclosure is provided;

[0035] Figure 8 A structure schematic diagram of a head-up display device provided by an embodiment of the present disclosure is provided. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical scheme of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0037] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the ordinary meanings as understood by one of ordinary skill in the art to which this application pertains. The terms "a", "an", "one", "this", and the like, as used in the present application, do not denote a limitation of quantity and can be used in the context of a singular or plural number. The terms "including", "containing", "having", and the like, as used in the present application, are intended to be broad and encompass the presence of steps or components whether listed or not. The terms "connected", "coupled", or the like, as used in the present application, are not limited to direct or physical connections, but can include electrical connection whether direct or indirect. The term "multiple" means two or more. The term "and / or", as used in the present application, describes association between or among multiple options, and is not limited to co-existence of the multiple options. The character " / " is generally used to represent an "or" relationship between associated objects. The terms "first", "second", "third", and the like, as used in the present application, are used only to distinguish similar objects, and do not represent a specific order or sequence. The terms "upper", "lower", "left", "right", and the like, are used only to represent relative positional relationships, and can change when the absolute positions of the described objects change.

[0038] As used herein, "parallel", "perpendicular" include the recited condition and conditions that are approximately the recited condition, within an acceptable range of deviation, as determined by one of ordinary skill in the art taking into account the measurement being discussed and the error associated with a particular measurement (i.e., limitations of the measurement system). For example, "parallel" includes absolute parallel and approximately parallel, where the acceptable range of deviation for approximately parallel can be, for example, within 5°; "perpendicular" includes absolute perpendicular and approximately perpendicular, where the acceptable range of deviation for approximately perpendicular can also be, for example, within 5°.

[0039] Exemplary embodiments are described herein with reference to cross-sectional and / or plan view illustrations that are schematic illustrations of idealized embodiments. In the drawings, the thickness of layers and regions are exaggerated for clarity. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. The regions illustrated in the figures are schematic and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.

[0040] Figure 1 This is an exemplary application diagram of a head-up display device, which can be installed on vehicles or other means of transportation. Figure 1 As shown, the head-up display device includes an image source for outputting image light and an amplifying element for magnifying the image light emitted from the image source. The image source includes at least one display panel 10 and a backlight source providing backlight to the display panel 10, with the display panel 10 positioned on the light-emitting side of the backlight source. For example, the display panel 10 is a liquid crystal display panel 10. The display panel 10 includes multiple pixel units, each pixel unit including multiple sub-pixels, for example, each pixel unit including a red sub-pixel, a green sub-pixel, and a blue sub-pixel; or, for example, each pixel unit including a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. The display panel 10 is used to convert the light emitted from the backlight source into image light capable of forming an image. After being processed by the amplifying element, the image light is incident on the windshield 20 of the vehicle, reflected by the windshield 20, and then incident on the eye box region 50. When the observer's eyes are within the eye box region 50, they can see the image formed by the image light. The image seen by the observer is a virtual image 40 formed by reflection imaging of the windshield 20. The observer can be a driver or a passenger. The observer can obtain the required vehicle information from the virtual image in front of their line of sight, such as driving speed, fuel consumption, etc., or other information, such as images from a virtual rearview mirror or audio-visual entertainment system.

[0041] Specifically, the eyebox area 50 of the head-up display device refers to the area where the observer's eyes are located and where they can see the image output by the head-up display device. The eyebox area 50 has a certain size, so even if the observer's eyes are deviated from the center of the eyebox area 50 by a certain distance, such as in the vertical or horizontal directions, as long as they are still within the eyebox area 50, they can see the image output by the head-up display device.

[0042] With the diversification of information, head-up display devices typically need to display various types of information simultaneously, such as navigation information, audio-visual entertainment information, fuel consumption information, engine speed information, etc. A single display panel cannot meet this requirement.

[0043] To address the aforementioned problems, this disclosure provides a head-up display device, such as... Figure 2As shown, the head-up display device includes a first display panel 101, a second display panel 102, and a light combination assembly 80. The first display panel 101 is configured to emit first image light rays for forming a first virtual image 41, the second display panel 102 is configured to emit second image light rays for forming a second virtual image 42, and the light combination assembly 80 is configured to reflect the first image light rays to form the first virtual image 41 and transmit the second image light rays to form the second virtual image 42. In some embodiments, the included angle between the principal axis of the first image light rays reflected by the light combination assembly 80 and the principal axis of the second image light rays transmitted by the light combination assembly 80 is less than or equal to a preset angle, and an example of the preset angle is in a range of 0° to 10°, so that the first virtual image 41 and the second virtual image 42 are coaxial (two virtual images coaxial in the present disclosure include absolute coaxial and approximate coaxial, wherein the absolute coaxial is the line connecting the center of the first virtual image 41 and the center of the eyebox region 50, and the line connecting the center of the second virtual image 42 and the center of the eyebox region 50, and the included angle between the two lines is 0°; the approximate coaxial is that the included angle between the two lines is within a preset angle range, for example, within 10°). In this way, when the display information is switched and displayed between the first virtual image 41 and the second virtual image 42, a visual continuous zoom effect can be generated, that is, the display information can be smoothly transitioned between the first virtual image 41 and the second virtual image 42, thereby avoiding the user's visual vergence problem. The virtual image distance of the first virtual image 41 is different from that of the second virtual image 42. For example, as shown in FIG. 1, the virtual image distance of the first virtual image 41 is greater than that of the second virtual image 42. Figure 2 Further, in one example, the content presented by the first virtual image 41 and the second virtual image 42 can have a certain relevance, for example, the first virtual image 41 presents brief information of the display content, and the second virtual image 42 presents detailed information of the display content. In another example, the content presented by the first virtual image 41 and the second virtual image 42 can have little or no relevance, for example, the first virtual image 41 presents a navigation guidance prompt, and the second virtual image 42 presents an image of audio-visual entertainment. In this way, the two display panels are arranged to image, which can enhance the diversity of information, so that the driver can obtain more information in one field of view, and does not need to frequently switch the line of sight, thereby improving the driving efficiency and safety. At the same time, arranging two display panels 101 / 102 can also distribute the burden of the optical system, reduce the risk of failure of the display panel, and ensure the continuous display of information. In addition, the sunlight incident from the external environment can be divided into two parts by the light combination assembly 80, one part is reflected to the first display panel 101 through the light combination assembly 80, and the other part is transmitted to the second display panel 102 through the light combination assembly 80, thereby reducing the temperature rise pressure of sunlight backflow on each display panel.

[0044] Further, referring to Figure 3The light combination assembly 80 of the present disclosure includes a transparent substrate 81, a transflector 82, and an anti-reflection film 83. The transparent substrate 81 includes a first surface S1 and a second surface S2 oppositely arranged along the thickness direction thereof, and the first surface S1 is closer to the first display panel 101 than the second surface S2. The transflector 82 is arranged on the first surface S1, and the anti-reflection film 83 is arranged on the second surface S2. The transflector 82 is configured to adjust the transmittance and reflectance of light incident on the first surface S1, and the anti-reflection film 83 is configured to improve the transmittance of light with a preset characteristic incident on the second surface S2.

[0045] It should be noted that the preset characteristic can include a visible light band or three preset bands, for example, three wavelengths of 440 nm, 545 nm, and 600 nm, or three bands of 420-460 nm, 525-565 nm, and 580-620 nm, or three bands of red, green, and blue. The light with the preset characteristic can be visible light or light with the above three preset bands. The external environment light (i.e., sunlight) includes visible light and infrared light. The wavelength range of the visible light band is 400-700 nm, and the wavelength range of the infrared light is 700-2000 nm. The first image light emitted by the first display panel 101 and the second image light emitted by the second display panel 102 both have the preset characteristic.

[0046] The light combination mirror includes the transparent substrate 81 and the transflector 82. It can be understood that, in the imaging process, the transflector 82 is arranged on the first surface S1 of the transparent substrate 81, and the anti-reflection film 83 is arranged on the second surface S2 of the transparent substrate 81. Figure 4(a) and 4(b), a part of the first image light rays is reflected to form the first virtual image 41, and another part of the first image light rays is transmitted through the first surface S1, reflected by the second surface S2, and then transmitted through the first surface S1 to form a ghost image 41' of the first virtual image 41, which reduces the display effect of the first virtual image 41. Therefore, the antireflection film 83 is arranged on the second surface S2 to make the first image light rays transmitted through the antireflection film 82 on the first surface S1 continue to be transmitted through the second surface S2, so that the useless first image light rays are emitted to the second surface S2, i.e. the non-light-emitting side, thereby avoiding the ghost image. Here, the useless first image light rays refer to the first image light rays that do not form the first virtual image 41, and the useful first image light rays refer to the first image light rays that form the first virtual image 41. The meanings of "useful light rays" and "useless light rays" are the same below. For example, the reflectivity of the antireflection film 83 for the light rays with the preset characteristics is less than or equal to 3%, preferably less than 1% or 0.1%, and more preferably less than 0.01%. It can be understood that, since the first image light rays and the second image light rays have the preset characteristics, the antireflection film 83 arranged on the second surface S2 can also improve the transmittance of the second image light rays on the second surface S2, thereby improving the light ray utilization rate of the second image light rays and the brightness of the second virtual image 42.

[0047] With reference to the foregoing Figure 3The partial-reflection film 82 disposed on the first surface S1 can reflect a portion of the light having the preset characteristics incident toward the first surface S1 and transmit another portion, and can reflect a portion of the sunlight (or a portion of the infrared light in the sunlight) incident toward the first surface S1 and transmit another portion of the sunlight (or another portion of the infrared light in the sunlight). Specifically, in the case where the backlight brightness of the first display panel 101 and the second display panel 102 is constant, the brightness of the first virtual image 41 and the second virtual image 42 can be changed by using the partial-reflection film 82 having different reflectivity (or transmittance) for the light having the preset characteristics. In order to realize the brightness of the two virtual images to be similar or the same, the brightness of the backlight providing the light to the first display panel 101 and the second display panel 102 can be controlled. For example, the transmittance of the partial-reflection film 82 for the light having the preset characteristics is greater than the reflectivity, or the transmittance of the partial-reflection film 82 and the anti-reflection film 83 as a whole for the light having the preset characteristics is greater than the reflectivity of the partial-reflection film 82 for the light having the preset characteristics. At this time, more useful second image light can be transmitted by the first surface S1, and thus more useful second image light can pass through the light combination assembly 80 to finally form the second virtual image 42, and only a small portion of useful first image light can be reflected by the partial-reflection film 82 to finally form the first virtual image 41. That is, at this time, the brightness of the first virtual image 41 is less than the brightness of the second virtual image 42, and thus in order to ensure that the brightness of the first virtual image 41 is similar to the brightness of the second virtual image 42, the brightness of the backlight of the first display panel 101 can be increased, or the brightness of the second display panel 102 can be decreased, so that the brightness of the backlight of the first display panel 101 is greater than the brightness of the backlight of the second display panel 102. Alternatively, different backlights can be installed for the first display panel 101 and the second display panel 102, so as to reduce the cost of the product. For example, the transmittance and the reflectivity of the partial-reflection film 82 for the light having the preset characteristics can be 80% and 20%, respectively, or 60% and 40%, respectively, and the like.

[0048] Of course, the transreflective film 82 can also be configured to have a transmittance less than a reflectance for light having the preset characteristics, or the transreflective film 82 and the antireflection film 83 as a whole can have a transmittance less than a reflectance for light having the preset characteristics, in which case more useful first image light can be reflected by the transreflective film 82 to form the first virtual image 41 ultimately, and less useful second image light can pass through the light combination assembly 80 to form the second virtual image 42 ultimately. In order to ensure that the brightness of the first virtual image 41 is comparable to that of the second virtual image 42, the brightness of the backlight of the second display panel 102 is greater than that of the first display panel 101. For example, the transreflective film 82 can have a transmittance of 40% and a reflectance of 60% for light having the preset characteristics, or a transmittance of 20% and a reflectance of 80% for light having the preset characteristics, and so on. Of course, the transreflective film 82 or the transreflective film 82 and the antireflection film 83 as a whole can also have equal transmittance and reflectance for light having the preset characteristics, i.e., the transmittance and the reflectance are both 50%. Under the premise of the same brightness of the backlight, such a configuration is conducive to ensuring that the brightness of the first virtual image 41 is consistent with that of the second virtual image 42, thereby improving the uniformity of the brightness of the two virtual images.

[0049] It should be noted that the transmittance of the transreflective film 82 and the antireflection film 83 as a whole for a certain type of light (e.g., light having the preset characteristics or infrared light) is the ratio of the light flux that finally passes through the antireflection film 83 to the light flux that is incident on the transreflective film 82 (i.e., the light flux that is incident on the transreflective film 82) among the light that is incident on the transreflective film 82 and passes through the transreflective film 82 and the antireflection film 83 in turn, or the ratio of the light flux that finally passes through the transreflective film 82 to the light flux that is incident on the antireflection film 83 (i.e., the light flux that is incident on the antireflection film 83) among the light that is incident on the antireflection film 83 and passes through the antireflection film 83 and the transreflective film 82 in turn.

[0050] Similarly, for sunlight (or infrared light in the sunlight) incident toward the first surface S1, the transreflective film 82 can reflect a portion of the sunlight (or a portion of the infrared light) and transmit another portion of the sunlight (or another portion of the infrared light), thereby distributing the sunlight (or the infrared light) incident from the external environment to the first display panel 101 and the second display panel 102 in different proportions, and further performing different temperature protection designs on the first display panel 101 and the second display panel 102.

[0051] In one example, the transmittance of the transflective film 82 to infrared light is less than its reflectance, or the overall transmittance of the transflective film 82 and the antireflective film 83 to infrared light is less than the reflectance of the transflective film 82 to infrared light. For example, the transmittance of the transflective film 82 to infrared light is 20%–40%, and its reflectance is 80%–60%. It is understood that when the transmittance is 40%, the reflectance is 60%, meaning the sum of transmittance and reflectance is 100%. In this example, more infrared light will be incident on the first display panel 101, causing the first display panel 101 to heat up. Therefore, a first heat-conducting element 61 can be provided on the light-emitting side of the first display panel 101, such as... Figure 5 As shown. The first heat-conducting element 61 can dissipate the high temperature heat generated by the backlight and / or infrared light irradiation of the first display panel 101 for a long time, thereby reducing the temperature of the first display panel 101 and ensuring the normal operation of the first display panel 101.

[0052] In addition, a first light filter element 71 can be disposed on the light-emitting surface side of the first display panel 101. The first light filter element 71 can be disposed between the first display panel 101 and the first heat-conducting element 61, or the first light filter element 71 can be disposed on the side of the first heat-conducting element 61 facing away from the first display panel 101. Preferably, referring to... Figure 5 The first heat-conducting element 61 is bonded to the light-emitting surface of the first display panel 101, and the first light-filtering element 71 is deposited or attached to the surface of the first heat-conducting element 61 that is away from the light-emitting surface of the first display panel 101. Preferably, the first heat-conducting element 61 can be fully bonded to the light-emitting surface of the first display panel 101. The first light-filtering element 71 fully covers the light-emitting surface of the first display panel 101. The first light-filtering element 71 is configured to transmit light with preset characteristics and reflect or absorb light without preset characteristics. Light without preset characteristics includes, but is not limited to, infrared light, light without the above three preset wavelengths, and other light besides those with preset characteristics. That is, the first light-filtering element 71 can transmit the first image light and reflect or absorb other light (e.g., infrared light). Without affecting the emission of the first image light, the first light-filtering element 71 can absorb or reflect some other light, preventing the first display panel 101 from heating up.

[0053] In another example, the transmittance of the transflective film 82 to infrared light is greater than its reflectance, or the combined transmittance of the transflective film 82 and the antireflective film 82 to infrared light is greater than the reflectance of the transflective film 82 to infrared light. In this case, more infrared light will be incident on the second display panel 102, causing the second display panel 102 to heat up. Therefore, in this example, the second heat-conducting element 62 can be provided only on the light-emitting side of the second display panel 102, such as... Figure 8As shown. In some examples, a second light-emitting element 72 can also be provided on the light-emitting surface side of the second display panel 102. Here, the second heat-conducting element 62 has the same material and arrangement as the first heat-conducting element 61, and their working principles are also the same. The second light-emitting element 72 is also arranged in the same way as the first light-emitting element 71, and will not be described again here. For example, the transmittance of the transflective film 82 to infrared light is 60% to 80%, and the reflectance is 40% to 20%.

[0054] Of course, the transmittance and reflectance of the transflective film 82 for infrared light can also be equal, that is, both transmittance and reflectance are 50%, or the overall transmittance of the transflective film 82 and the antireflective film 82 for infrared light is equal to the reflectance of the transflective film 82 for infrared light. In this case, the infrared light incident from the outside will be uniformly irradiated onto the first display panel 101 and the second display panel 102 after passing through the light combining component 80. In this case, heat-conducting elements can be provided on the light-emitting side of both the first display panel 101 and the second display panel 102. Specifically, a first heat-conducting element 61 is provided on the light-emitting side of the first display panel 101, and a second heat-conducting element 62 is provided on the light-emitting side of the second display panel 102. Furthermore, a first filter element 71 can also be provided on the light-emitting side of the first display panel 101, and a second filter element 72 can be provided on the light-emitting side of the second display panel 102, such as... Figure 8 As shown. The first light filter element 71 is disposed on the side of the first heat-conducting element 61 opposite to the first display panel 101, and the second light filter element 72 is disposed on the side of the second heat-conducting element 62 opposite to the second display panel 102. The placement of the heat-conducting element and the light filter element ensures that the temperatures of the first display panel 101 and the second display panel 102 do not become excessively high.

[0055] In some examples, both the first thermally conductive element 61 and the second thermally conductive element 62 can be made of polycarbonate or high thermal conductivity glass. High thermal conductivity glass includes, but is not limited to, sapphire glass, alumina glass, high borosilicate glass, ultra-clear glass, borosilicate glass, aluminosilicate glass, quartz glass, microcrystalline glass, spinel glass, graphene thermally conductive glass, indium tin oxide glass, and nanocomposite thermally conductive glass. Preferably, both the first thermally conductive element 61 and the second thermally conductive element 62 are made of high thermal conductivity glass with a thermal conductivity greater than 3 W / m*K, for example, both are made of sapphire glass with a thermal conductivity of 25 W / m*K. Sapphire glass not only has excellent thermal conductivity but also extremely high hardness and scratch resistance, thus protecting the display panel screen and extending its service life.

[0056] In some examples, the first conductive element 61 and the first display panel 101, and the second conductive element 62 and the second display panel 102, can be fixedly connected through an adhesive layer, which includes but is not limited to optical glue. Using optical glue to fix can make the heat distribution between the display panel and the conductive element uniform, and can buffer the friction between the display panel and the conductive element, thereby avoiding damage to the conductive element.

[0057] In some examples, the first filter element 71 and the second filter element 72 are each selected from any one or more of an infrared reflective film, an infrared absorbing film, a polarized reflective film, a polarized absorbing film, and a preset waveband filter film. In some examples, the first filter element 71 and the second filter element 72 each include an infrared reflective film or an infrared absorbing film, and further include any one or more selected from a polarized reflective film, a polarized absorbing film, and a preset waveband filter film. The preset waveband filter film is configured to transmit light having the three preset wavebands described above, and reflect or absorb light not having the three preset wavebands. The infrared reflective film can transmit image light emitted by the display panel and reflect back-infiltrated infrared light. Specifically, the infrared reflective film can have a transmittance of 20% to 100%, such as 70%, 80%, 95%, etc., for image light, and a reflectance of 50% to 99%, such as 95%, for infrared light. The infrared absorbing film can transmit image light emitted by the display panel and absorb back-infiltrated infrared light. Specifically, the infrared absorbing film can have a transmittance of 20% to 100%, such as 70%, 80%, 95%, etc., for image light, and an absorption rate of 50% to 99%, such as 95%, for infrared light.

[0058] When the image light emitted by the display panel also has a preset polarization characteristic, i.e., the image light has the preset characteristic and the preset polarization characteristic described above, the image light can be visible light having the preset polarization characteristic, or light having the preset polarization characteristic and the three preset wavebands. The polarized reflective film can transmit image light emitted by the display panel having the preset polarization characteristic, and reflect other polarized light; the polarized absorbing film can transmit image light emitted by the display panel having the preset polarization characteristic, and absorb other polarized light. The preset polarization characteristic can be S-polarization or P-polarization.

[0059] In some examples, with reference to Figure 6 and Figure 8The head-up display device further comprises a first heat dissipation element 111, a first support 121 and a first temperature sensor TP1 connected with the first heat conduction element 61, and a second heat dissipation element 112, a second support 122 and a second temperature sensor TP2 connected with the second heat conduction element 62. The first heat dissipation element 111 is configured to dissipate the heat conducted by the first heat conduction element 61, and the second heat dissipation element 112 is configured to dissipate the heat conducted by the second heat conduction element 62. The first support 121 is configured to support the first display panel 101, and the second support is configured to support the second display panel 102. The first temperature sensor TP1 is configured to detect the temperature of the first display panel 101, and the second temperature sensor TP2 is configured to detect the temperature of the second display panel 102.

[0060] Specifically, the first heat dissipation element 111 and the second heat dissipation element 112 can each be any one of a semiconductor refrigeration sheet, a liquid heat dissipation element, and a metal heat dissipation element. The semiconductor refrigeration sheet, also known as a thermoelectric refrigeration sheet, is a kind of heat pump. Its advantages are that there are no sliding parts, it can be applied in situations where space is limited, it has high reliability, and it does not pollute the refrigerant. The semiconductor refrigeration sheet is made of many N-type semiconductors and P-type semiconductors arranged alternately, and the N-type semiconductors and the P-type semiconductors are connected by a general conductor to form a complete circuit. The conductor is usually copper, aluminum or other metal conductor. Finally, the two ceramic sheets are sandwiched like a sandwich. The semiconductor refrigeration sheet uses the Peltier effect of semiconductor materials. When a direct current passes through an electric couple composed of two different semiconductor materials in series, heat can be absorbed and released at both ends of the electric couple, achieving the purpose of refrigeration. It is a negative thermal resistance refrigeration technology, which has the characteristics of no moving parts and high reliability.

[0061] Thermal silicone grease or thermal glue can be provided between the first heat conduction element 61 and the first heat dissipation element 111, and between the second heat conduction element 62 and the second heat dissipation element 112, for fixation. The use of thermal silicone grease or thermal glue for fixation can make the heat dissipation element and the heat conduction element evenly heated, and can buffer the friction between the heat dissipation element and the heat conduction element, thereby avoiding damage to the heat dissipation element.

[0062] In some examples, the first support 121 and the second support 122 can be made of metal material. On the one hand, the support can be used to support the display panel, and on the other hand, since the metal material has good heat conduction performance, the support can dissipate the heat on the display panel. In some examples, the support can also be connected with the heat conduction element, so as to also dissipate the heat in the heat conduction element.

[0063] Further, the first temperature sensor TP1 is in contact with at least one of the first support 121, the first heat-conducting element 61, the first heat-dissipating element 111, and the first display panel 101, and the second temperature sensor TP2 is in contact with at least one of the second support 122, the second heat-conducting element 62, the second heat-dissipating element 112, and the second display panel 102. In some examples, the first temperature sensor TP1 is attached to a surface of the first heat-conducting element 61 away from the light-out surface of the first display panel 101, and the second temperature sensor TP2 is attached to a surface of the second heat-conducting element 62 away from the light-out surface of the second display panel 102. The first display panel 101 and the first temperature sensor TP1 are arranged in the same way as the second display panel 102 and the second temperature sensor TP2.

[0064] Taking the first display panel 101 as an example, in order to avoid the arrangement of the first temperature sensor TP1 affecting the display effect of the first display panel 101, the first temperature sensor TP1 does not overlap with the orthographic projection of the light-out surface of the first display panel 101 on the plane in which the light-out surface lies. Preferably, the first temperature sensor TP1 is arranged on a surface of the first heat-conducting element 61 away from the first display panel 101, for example, the first temperature sensor TP1 is attached to a surface of the first heat-conducting element 61 away from the first display panel 101, and the first temperature sensor TP1 does not overlap with the orthographic projection of the light-out surface of the first display panel 101 on the plane in which the light-out surface lies. Arranging the first temperature sensor TP1 on the first heat-conducting element 61 can make the detected temperature closer to the actual temperature of the first display panel 101 while avoiding affecting imaging, and avoid overheating of the inside of the first display panel 101.

[0065] In some examples, the head-up display device further comprises a controller connected to the first temperature sensor TP1 and the second temperature sensor TP2. Taking the first temperature sensor TP1 as an example, the controller thereof is configured to issue a first control instruction to reduce the temperature of the first display panel 101 when the temperature sensed by the first temperature sensor TP1 reaches a threshold value. In one example, the controller can be connected to a driving circuit for controlling the brightness of the backlight source, and the driving circuit reduces the luminous brightness of the backlight source in response to the first control instruction. In another example, the controller can be connected to a heat-dissipating device (for example, a fan), and the heat-dissipating device starts working to reduce the temperature of the first display panel 101 in response to the first control instruction. Of course, the controller can also be connected to a reminding device (for example, a breathing light), and the reminding device issues a reminding signal to remind the user to lower the brightness in response to the first control instruction.

[0066] In some examples, the head-up display device further comprises at least one reflecting element 30, as shown in FIG. 1. Referring back to FIG. 1, Figure 7 Figure 7 ​The light rays emitted from the light exit side of the light combination assembly 80 can be reflected by the at least one reflecting element 30 and then incident to the external imaging device for imaging. For example, the reflecting element 30 includes a curved mirror, or the reflecting element 30 includes a curved mirror and a plane mirror, the plane mirror can reflect the image light to the curved mirror, the curved mirror can adjust the transmission direction of the image light, and the image can be magnified and then transmitted to the external imaging device. In one example, the head-up display device includes only one reflecting element 30, which is a primary reflecting mirror 31, and the primary reflecting mirror 31 is a curved mirror. It can be understood that the image light emitted from the light combination assembly 80 is reflected to the outside by the reflecting element 30, and the external infrared light can also be reflected to the light combination assembly 80 by the reflecting element 30 and then propagate towards the first display panel 101 and the second display panel 102. Therefore, a cutoff element 90 can be arranged on the reflecting surface of the primary reflecting mirror 31. The cutoff element 90 is configured to reflect light rays with predetermined characteristics, i.e., to reflect the first image light and the second image light, and to transmit or absorb infrared light, so as to reduce the infrared light incident to the light combination assembly 80. For example, the cutoff element 90 includes an external transmission film or an infrared absorption film, and the cutoff element 90 covers the entire reflecting surface of the primary reflecting mirror 31.

[0067] In another example, referring to Figure 7 , the head-up display device includes two reflecting elements 30, i.e., a primary reflecting mirror 31 and a secondary reflecting mirror 32. The primary reflecting mirror 31 is a curved mirror, and the secondary reflecting mirror 32 is a plane mirror. The image light emitted from the light combination assembly 80 is first reflected by the plane mirror and then reflected by the curved mirror and reaches the external imaging device for imaging. Of course, the secondary reflecting mirror 32 can also be a curved mirror, which is not limited in the present disclosure. In some examples, the cutoff element 90 is arranged on at least part of the reflecting surface of the reflecting element 30, for example, the cutoff element 90 is arranged on the reflecting surface of the primary reflecting mirror 31 or the secondary reflecting mirror 32. Figure 7 In the example, the cutoff element 90 is arranged on the reflecting surface of the primary reflecting mirror 31 and the secondary reflecting mirror 32. The cutoff element 90 is configured to reflect light rays with predetermined characteristics, i.e., to reflect the first image light and the second image light, and to transmit or absorb infrared light, so as to reduce the infrared light incident to the light combination assembly 80. For example, the cutoff element 90 includes an external transmission film or an infrared absorption film, and the cutoff element 90 covers the entire reflecting surface of the reflecting mirror where the cutoff element 90 is arranged.

[0068] Optionally, the curved mirror is a free-form curved mirror, that is, the reflecting surface of the mirror is a free-form surface, or the reflecting surface does not have rotational symmetry, so as to improve the imaging quality of the head-up display device.

[0069] In some examples, the backlight providing light for the first display panel 101 and the second display panel 102 can include light emitting devices arranged in an array, which can be electroluminescent elements such as light emitting diodes (LEDs), organic light emitting diodes (OLEDs), mini light emitting diodes (MiniLEDs), micro light emitting diodes (MicroLEDs), cold cathode fluorescent lamps (CCFLs), electroluminescent displays (ELDs), cold LED lights (CLLs), electro luminescent (EL), field emission displays (FEDs), halogen tungsten lamps, or metal halide lamps, etc., which are not limited in the embodiments of the present disclosure.

[0070] In some embodiments, referring to Figure 8 The head-up display device can further include a housing 130, and the first display panel 101, the second display panel 102, the first heat-conducting element 61, the second heat-conducting element 62, the first filter element 71, the second filter element 72, the first heat-dissipating element 111, the second heat-dissipating element 112, the first support 121, the second support 122, the first mirror 31, and the second mirror 32 are all located in the housing 130. The housing has an opening 1301, so that the image light can be emitted from the opening to the imaging device.

[0071] The embodiments of the present disclosure further provide a traffic device, which includes the head-up display device and a windshield glass. The windshield glass is used to reflect the image light emitted by the head-up display device to a preset area. When the eyes of an observer are located in the preset area, the observer can simultaneously see the virtual image formed by the head-up display device.

[0072] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered as the protection scope of the present application.

Claims

1. A head-up display device, comprising a first display panel, a second display panel and a light combining assembly; characterized in that, the light combining assembly comprises a transparent substrate, an anti-reflection film and a transflector; the transparent substrate comprises a first surface and a second surface oppositely arranged along a thickness direction thereof; the transflector is arranged on the first surface, and the anti-reflection film is arranged on the second surface; the first display panel is configured to emit first image light rays towards the transflector; the second display panel is configured to emit second image light rays towards the anti-reflection film; the light combining assembly is configured to reflect the first image light rays to form a first virtual image, and transmit the second image light rays to form a second virtual image; the anti-reflection film is configured to improve the transmittance of light rays with a preset characteristic on the second surface; the first image light rays have the preset characteristic.

2. The head-up display device of claim 1, wherein the first image light rays and the second image light rays both have the preset characteristic; the preset characteristic comprises a visible light waveband or three preset wavebands.

3. The head-up display device of claim 2, wherein, the transmittance of the transflector to light rays with the preset characteristic is less than the reflectance, or the transmittance of the transflector and the anti-reflection film as a whole to light rays with the preset characteristic is less than the reflectance of the transflector to light rays with the preset characteristic; the backlight brightness of the second display panel is greater than that of the first display panel.

4. The head-up display device of claim 2, wherein, the transmittance of the transflector to light rays with the preset characteristic is greater than the reflectance, or the transmittance of the transflector and the anti-reflection film as a whole to light rays with the preset characteristic is greater than the reflectance of the transflector to light rays with the preset characteristic; the backlight brightness of the first display panel is greater than that of the second display panel.

5. The head-up display device of claim 1, wherein, the transmittance of the transflector to infrared light is less than the reflectance, or the transmittance of the transflector and the anti-reflection film as a whole to infrared light is less than the reflectance of the transflector to infrared light; a first heat conduction element is arranged on the light emitting surface side of the first display panel; the first heat conduction element is configured to conduct heat on the first display panel out; or, the transmittance of the transflector to infrared light is greater than the reflectance, or the transmittance of the transflector and the anti-reflection film as a whole to infrared light is greater than the reflectance of the transflector to infrared light; a second heat conduction element is arranged on the light emitting surface side of the second display panel; the second heat conduction element is configured to conduct heat on the second display panel out; or, the transmittance of the transflector to infrared light is equal to the reflectance, or the transmittance of the transflector and the anti-reflection film as a whole to infrared light is equal to the reflectance of the transflector to infrared light; a first heat conduction element is arranged on the light emitting surface side of the first display panel, and a second heat conduction element is arranged on the light emitting surface side of the second display panel; the first heat conduction element is configured to conduct heat on the first display panel out, and the second heat conduction element is configured to conduct heat on the second display panel out.

6. The head-up display device of claim 5, wherein, The light-outgoing surface side of the first display panel is provided with a first light filtering element configured to transmit light rays with the preset characteristics and reflect or absorb light rays without the preset characteristics; and / or, the light-outgoing surface side of the second display panel is provided with a second light filtering element configured to transmit light rays with the preset characteristics and reflect or absorb light rays without the preset characteristics.

7. The head-up display device of claim 1, wherein, The head-up display device further comprises at least one reflecting element; the first image light rays reflected by the light combination assembly and the second image light rays transmitted by the light combination assembly are incident to the at least one reflecting element, and are then reflected by the at least one reflecting element and incident to an external imaging device to form images; The reflecting surface of the at least one reflecting element is provided with a cutoff element; the cutoff element is configured to reflect light rays with the preset characteristics and transmit or absorb infrared light; the first image light rays and the second image light rays both have the preset characteristics, and the preset characteristics include a visible light waveband or three preset wavebands.

8. The head-up display device of claim 7, wherein, The head-up display device comprises one reflecting element, which is a primary reflecting mirror; the primary reflecting mirror is a curved reflecting mirror; the cutoff element is provided on the reflecting surface of the curved reflecting mirror, and the cutoff element comprises an infrared transmitting film or an infrared absorbing film; or, The head-up display device comprises two reflecting elements, which are a primary reflecting mirror and a secondary reflecting mirror; the first image light rays reflected by the light combination assembly and the second image light rays transmitted by the light combination assembly are sequentially reflected by the secondary reflecting mirror and the primary reflecting mirror, and then are incident to an external imaging device to form images; the primary reflecting mirror is a curved reflecting mirror; The secondary reflecting mirror is a curved reflecting mirror or a plane mirror; the cutoff element is provided on the reflecting surface of the primary reflecting mirror and / or the secondary reflecting mirror, and the cutoff element comprises an infrared transmitting film or an infrared absorbing film.

9. The head-up display device of claim 5, wherein, The first heat-conducting element and the second heat-conducting element both comprise any one of polycarbonate, sapphire glass, alumina glass, high-silicon boron glass, ultra-white glass, silicate glass, aluminum-silicon glass, quartz glass, microcrystalline glass, spinel glass, graphene heat-conducting glass, indium tin oxide glass, and nano-composite heat-conducting glass.

10. The head-up display device of claim 6, wherein, The first light filtering element and the second light filtering element are both selected from any one or more of an infrared reflecting film, an infrared absorbing film, a polarized reflecting film, a polarized absorbing film, and a preset waveband filtering film; or, the first light filtering element and the second light filtering element both comprise an infrared reflecting film or an infrared absorbing film, and further comprise any one or more of a polarized reflecting film, a polarized absorbing film, and a preset waveband filtering film; The preset waveband filtering film is configured to transmit light rays with three preset wavebands and reflect or absorb light rays without the three preset wavebands.

11. The head-up display device of claim 5, wherein, Further comprising a first heat-dissipating element, a first temperature sensor, and a first support connected to the first heat-conducting element; the first heat-dissipating element is configured to dissipate heat conducted by the first heat-conducting element. The first temperature sensor is configured to detect the temperature of the first display panel; The first support is configured to support the first display panel; the first temperature sensor is connected with at least one of the first support, the first heat-conducting element, and the first heat-dissipating element; And / or, The head-up display device further comprises a second heat-dissipating element, a second temperature sensor, and a second support connected with the second heat-conducting element; the second heat-dissipating element is configured to dissipate the heat conducted by the second heat-conducting element; The second support is configured to support the second display panel; The second temperature sensor is configured to detect the temperature of the second display panel; The second temperature sensor is connected with at least one of the second support, the second heat-conducting element, and the second heat-dissipating element.

12. The head-up display device of claim 5, wherein, The first heat-conducting element is attached to the light-emitting surface of the first display panel, and the second heat-conducting element is attached to the light-emitting surface of the second display panel.

13. The head-up display device of claim 6, wherein, The first light-filtering element is coated on or attached to the surface of the first heat-conducting element away from the light-emitting surface, and the second light-filtering element is coated on or attached to the surface of the second heat-conducting element away from the light-emitting surface.

14. The head-up display device of claim 11, wherein, The first temperature sensor is attached to the surface of the first heat-conducting element away from the light-emitting surface, and / or the second temperature sensor is attached to the surface of the second heat-conducting element away from the light-emitting surface.

15. The head-up display device of claim 1, wherein, The included angle between the main optical axis of the first image light reflected by the light-combining assembly and the main optical axis of the second image light transmitted by the light-combining assembly is less than or equal to a preset angle; the preset angle is in the range of 0°-10°.

16. A traffic device, characterized by The head-up display device comprises the head-up display device according to any one of claims 1-15. The head-up display device comprises the head-up display device according to any one of claims 1-15.

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