Head-up display device and traffic device

Abstract

The invention provides a head-up display device, and belongs to the technical field of optical imaging. The head-up display device comprises a first display panel, a second display panel and a light combination assembly. The light combination assembly comprises a transparent substrate, a transflective film and an antireflection film. The transparent substrate comprises a first surface and a second surface which are oppositely arranged in the thickness direction of the transparent substrate. The transflective film is arranged on the first surface, and the antireflection film is arranged on the second surface. The first display panel is configured to emit first image light towards the transflective film; the second display panel is configured to emit second image light 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 wavelength characteristics on the second surface, and the first image light rays and the second image light rays both have the preset wavelength characteristics.

Description

Technical Field

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

[0002] Head up display (HUD) technology is a technology that uses the principle of optical reflection to project the light emitted by the image source onto an imaging window (imaging board, windshield, etc.), and then reflects it into the eye box through the imaging window to form a virtual image. The virtual image can display the desired information, such as driving-related information such as vehicle speed, to avoid distraction caused by the driver looking down at the dashboard during driving, thereby improving driving safety and providing a better driving experience.

[0003] The inventors have found that using a light combining mirror in the imaging light path will not only reduce the brightness of the virtual image, but also cause the virtual image to have a ghosting problem. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and provides a head-up display device, including a first display panel, a second display panel and a light combining component; wherein,

[0005] The light combining assembly includes a transparent substrate, a transflective film and an anti-reflective film; the transparent substrate includes a first surface and a second surface arranged opposite to each other along a thickness direction thereof; the transflective film is arranged on the first surface, and the anti-reflective film is arranged on the second surface; the first display panel is configured to emit a first image light toward the transflective film; the second display panel is configured to emit a second image light toward the anti-reflective 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;

[0006] The anti-reflection film is configured to increase the transmittance of light with a preset wavelength characteristic on the second surface; both the first image light and the second image light have the preset wavelength characteristic.

[0007] In some embodiments, the transmittance of the transflective film to the light with the preset wavelength characteristic is less than its reflectivity, or the transmittance of the transflective film and the anti-reflection film as a whole to the light with the preset wavelength characteristic is less than the reflectivity of the transflective film to the light with the preset wavelength characteristic, and the backlight brightness of the second display panel is greater than the backlight brightness of the first display panel; the preset wavelength characteristic includes a visible light band or three preset bands.

[0008] In some embodiments, the transmittance of the transflective film to the light with the preset wavelength characteristic is greater than its reflectivity, or the transmittance of the transflective film and the anti-reflection film as a whole to the light with the preset wavelength characteristic is greater than the reflectivity of the transflective film to the light with the preset wavelength characteristic, and the backlight brightness of the first display panel is greater than the backlight brightness of the second display panel; the preset wavelength characteristic includes a visible light band or three preset bands.

[0009] In some embodiments, the transmittance of the transflective film to infrared light is less than the reflectance, or the transmittance of the transflective film and the anti-reflective film as a whole to infrared light is less than the reflectance of the transflective film to infrared light, and a first heat-conducting element is provided on the light-emitting surface side of the first display panel; the first heat-conducting element is configured to conduct heat from the first display panel;

[0010] or,

[0011] The transmittance of the transflective film to infrared light is greater than the reflectance, or the transmittance of the transflective film and the anti-reflective film as a whole to infrared light is greater than the reflectance of the transflective film to infrared light, and a second heat-conducting element is provided on the light-emitting side of the second display panel; the second heat-conducting element is configured to conduct heat from the second display panel;

[0012] or,

[0013] The transmittance of the transflective film to infrared light is equal to the reflectance, or the transmittance of the transflective film and the anti-reflection film as a whole to infrared light is equal to the reflectance of the transflective film to infrared light. A first heat-conducting element is arranged on the light-emitting surface side of the first display panel, and a second heat-conducting element is arranged on the light-emitting surface side of the second display panel; the first heat-conducting element is configured to export heat from the first display panel, and the second heat-conducting element is configured to export heat from the second display panel.

[0014] In some embodiments, the first heat conducting element is in contact with the light emitting surface of the first display panel, and the second heat conducting element is in contact with the light emitting surface of the second display panel.

[0015] In some embodiments, the first thermally conductive element and the second thermally conductive element both include any one of polycarbonate, sapphire glass, alumina glass, high borosilicate glass, ultra-white glass, borosilicate glass, aluminosilicate glass, quartz glass, glass-ceramics, spinel glass, graphene thermally conductive glass, indium tin oxide glass, and nano-composite thermally conductive glass.

[0016] In some embodiments, a first filter element is disposed on the light-emitting surface side of the first display panel, and / or a second filter element is disposed on the light-emitting surface side of the second display panel; wherein,

[0017] The first filter element is configured to: transmit light with the preset wavelength characteristic, and reflect or absorb light without the preset wavelength characteristic; and / or transmit light with a first polarization characteristic, and reflect or absorb light without the first polarization characteristic, wherein the first image light also has the first polarization characteristic;

[0018] The second filter element is configured to: transmit light with the preset wavelength characteristic, and reflect or absorb light without the preset wavelength characteristic; and / or transmit light with a second polarization characteristic, and reflect or absorb light without the second polarization characteristic, wherein the second image light also has the second polarization characteristic.

[0019] In some embodiments, the first filter element is plated or attached to a surface of the first heat conducting element away from the light emitting surface, and the second filter element is plated or attached to a surface of the second heat conducting element away from the light emitting surface.

[0020] In some embodiments, the first filter element and the second filter element are both 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 band filter film; or, the first filter element and the second filter element both 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 band filter film;

[0021] The preset wavelength band filter film is configured to transmit light having three preset wavelength bands and reflect or absorb light not having the three preset wavelength bands.

[0022] In some embodiments, the head-up display device further includes a first heat dissipation element, a first support, and a first temperature sensor connected to the first heat-conducting element; the first heat dissipation element is configured to dissipate heat derived from the first heat-conducting element; the first support is configured to support the first display panel; the first temperature sensor is configured to detect the temperature of the first display panel, and the first temperature sensor is connected to at least one of the first heat-conducting element, the first heat dissipation element, and the first support; and / or,

[0023] The head-up display device also includes a second heat dissipation element, a second support member, and a second temperature sensor connected to the second heat-conducting element; the second heat dissipation element is configured to dissipate heat derived from the second heat-conducting element; the second support member 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 heat-conducting element, the second heat dissipation element, and the second support member.

[0024] In some embodiments, the first temperature sensor is attached to a surface of the first heat conducting element away from the first display panel, and / or,

[0025] The second temperature sensor is attached to a surface of the second heat conducting element at a side away from the second display panel.

[0026] In some embodiments, the head-up display device further includes a controller configured to send a first control instruction to reduce the temperature of the first display panel and the second display panel when the temperature sensed by the first temperature sensor or the second temperature sensor reaches a threshold.

[0027] In some embodiments, the thermal resistance of the first heat-conducting element and the second heat-conducting element are both less than or equal to 600K / W, or the thermal resistance of the first heat-conducting element and the second heat-conducting element are both less than or equal to 300K / W, or the thermal resistance of the first heat-conducting element and the second heat-conducting element are both less than or equal to 100K / W, or the thermal resistance of the first heat-conducting element and the second heat-conducting element are both less than or equal to 50K / W, or the thermal resistance of the first heat-conducting element and the second heat-conducting element are both less than or equal to 20K / W.

[0028] In some embodiments, the thermal conductivity of the first heat-conducting element and the second heat-conducting element are both greater than or equal to 1.5 W / m*K, or the thermal conductivity of the first heat-conducting element and the second heat-conducting element are both greater than or equal to 2 W / m*K, or the thermal conductivity of the first heat-conducting element and the second heat-conducting element are both greater than or equal to 3 W / m*K.

[0029] In some embodiments, the thickness of the first heat-conducting element and the second heat-conducting element both range from 0.01 mm to 15 mm, or the thickness of the first heat-conducting element and the second heat-conducting element both range from 0.01 mm to 2 mm.

[0030] In some embodiments, the head-up display device also includes at least one reflective element; the first image light reflected by the light combining component and the second image light transmitted by the light combining component are incident on the at least one reflective element, and after being reflected by the at least one reflective element, are incident on an external imaging device for imaging.

[0031] In some embodiments, the angle between the main optical axis of the first image light after being reflected by the light combining component and the main optical axis of the second image light after being transmitted by the light combining component is less than or equal to a preset angle; the preset angle ranges from 0° to 10°.

[0032] The present disclosure also provides a traffic device, including the head-up display device in the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of an exemplary head-up display device;

[0034] Figure 2 A schematic diagram of the structure of a head-up display device provided in an embodiment of the present disclosure;

[0035] Figure 3 A schematic diagram of the structure of another head-up display device provided in an embodiment of the present disclosure;

[0036] Figure 4 A schematic diagram of a partial structure of a head-up display device provided in an embodiment of the present disclosure;

[0037] Figure 5 A schematic structural diagram of a first display panel provided in an embodiment of the present disclosure;

[0038] Figure 6 A schematic structural diagram of another first display panel provided in an embodiment of the present disclosure;

[0039] Figure 7 A schematic diagram of the structure of another head-up display device provided in an embodiment of the present disclosure;

[0040] Figure 8 A schematic diagram of the structure of another head-up display device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0042] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0043] As used herein, "parallel" and "perpendicular" include the described situation and the situation similar to the described situation, and the range of the similar situation is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the error associated with the measurement of a specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°.

[0044] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include deviations in shape due to, for example, manufacturing. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0045] Figure 1 FIG. 1 is a schematic diagram of an exemplary application of a head-up display device, which can be installed on a vehicle or other transportation vehicle. Figure 1 As shown, the head-up display device includes an image source for outputting image light and an amplifying element for amplifying and imaging the image light emitted by the image source. The image source includes at least one display panel 10 and a backlight source for providing backlight to the display panel 10, and the display panel 10 is arranged 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 a plurality of pixel units, each of which includes a plurality of sub-pixels, for example, each pixel unit includes a red sub-pixel, a green sub-pixel and a blue sub-pixel; for another example, each pixel unit includes 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 by the backlight source into image light that can form an image. Afterwards, the image light is processed by the amplifying element and incident on the windshield 20 of the vehicle, and is reflected by the windshield 20 and incident on the eye box area 50. When the observer's eyes are in the eye box area 50, the image formed by the image light can be seen. At this time, the image seen by the observer is a virtual image 40 formed by the windshield 20 in a reflective imaging manner. The observer may be a driver or a passenger, and may obtain the required vehicle information, such as driving speed, fuel consumption, etc., from the virtual image in front of the observer's sight. It may also be other information, such as the image of a virtual rearview mirror or the image of audio and video entertainment.

[0046] The eyebox area 50 of the head-up display device specifically refers to the area where the eyes of the observer are located and the image output by the head-up display device can be seen. The eyebox area 50 has a certain size, and even if the eyes of the observer deviate a certain distance from the center of the eyebox area 50, such as a certain distance in the up-down or left-right direction, as long as they are still within the eyebox area 50, the image output by the head-up display device can be seen.

[0047] With the development of diversified information, head-up display devices usually need to present a variety of different information at the same time, such as navigation road information, audio and video entertainment information, fuel consumption information, engine speed information, etc., and a single display panel cannot meet this demand.

[0048] To solve the above problems, the present 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 combining component 80. The first display panel 101 is configured to emit a first image light for forming a first virtual image 41, the second display panel 102 is configured to emit a second image light for forming a second virtual image 42, and the light combining component 80 is configured to reflect the first image light to form the first virtual image 41, and transmit the second image light to form the second virtual image 42. In some embodiments, the angle between the main optical axis of the first image light after being reflected by the light combining component 80 and the main optical axis of the second image light after being transmitted by the light combining component 80 is less than or equal to a preset angle. Exemplarily, the preset angle has a value range of 0° to 10°, so that the first virtual image 41 and the second virtual image 42 are coaxial (the two virtual images in the present disclosure are coaxial, including absolute coaxiality and approximate coaxiality, wherein absolute coaxiality is a line connecting the center of the first virtual image 41 and the center of the eye box area 50, and a line connecting the center of the second virtual image 42 and the center of the eye box area 50, and the angle between these two lines is 0°; approximate coaxiality is an angle between these two lines within a preset angle range, for example, within 10°). In this way, when the display information is switched between the first virtual image 41 and the second virtual image 42, a visual continuous zoom effect can be produced, that is, the display information can be displayed in the first virtual image 41 and in the second virtual image 42 for a smooth transition, thereby avoiding the user's visual convergence problem. The virtual image distances of the first virtual image 41 and the second virtual image 42 are different. Figure 2 As shown, the virtual image distance of the first virtual image 41 is greater than the virtual image distance of the second virtual image 42. Further, in one example, the contents presented by the first virtual image 41 and the second virtual image 42 may be correlated, 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 contents presented by the first virtual image 41 and the second virtual image 42 may have little or no correlation, 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, setting two display panels for imaging can enhance the diversity of information, so that the driver can obtain more information in one field of view without frequently switching lines of sight, thereby improving driving efficiency and safety. At the same time, setting two display panels 101 / 102 can also disperse the burden of the optical system, reduce the risk of display panel failure, 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 combining component 80, one part is reflected to the first display panel 101 by the light combining component 80, and the other part is transmitted to the second display panel 102 by the light combining component 80, thereby reducing the temperature rise pressure of sunlight backflow on each display panel.

[0049] Further, see Figure 3, the light combining assembly 80 of the present disclosure includes a transparent substrate 81, a transflective film 82 and an anti-reflective film 83. The transparent substrate 81 includes a first surface S1 and a second surface S2 which are arranged opposite to each other along the thickness direction thereof, and the first surface S1 is closer to the first display panel 101 than the second surface S2. Among them, the transflective film 82 is arranged on the first surface S1, and the anti-reflective film 83 is arranged on the second surface S2. The transflective film 82 is configured to adjust the transmittance and reflectivity of the light incident on the first surface S1, and the anti-reflective film 83 is configured to increase the transmittance of the light with a preset wavelength characteristic incident on the second surface S2 on the second surface S2. Among them, 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 wavelength characteristic.

[0050] It should be noted that the preset wavelength characteristics may include a visible light band or three preset bands, wherein. The three preset bands are, for example, three wavelengths of 440nm, 545nm and 600nm, or three bands of 420-460nm, 525-565nm and 580-620nm, or three bands of red, green and blue. External ambient light (i.e., sunlight) includes visible light and infrared light. Among them, the wavelength range of the visible light band is also 400nm-700nm, and the wavelength range of infrared light is 700nm-2000nm.

[0051] The light combining mirror includes a transparent substrate 81 and a transflective film 82. It is understandable that, during the imaging process, the useful light in the second image light emitted by the second display panel 102 is transmitted through the second surface S2 of the transparent substrate 81 and finally forms the second virtual image 42, and the useless light is reflected by the second surface S2 to the non-light-emitting side of the light combining mirror (i.e., the side where the second surface S2 is located. Among them, the light combining mirror can divide the space where it is located into the side where the first surface S1 is located, and the side where the second surface S2 is located). Since the second surface S2 of the light combining mirror will reflect part of the second image light, compared with the virtual image formed by the second display panel 102 when the light combining mirror is not used, the luminous flux of the second image light used to form the second virtual image 42 is reduced, resulting in a reduction in the utilization rate of the second image light and a reduction in the brightness of the second virtual image 42. Therefore, providing an anti-reflection film 83 on the second surface S2 can increase the transmittance of the second image light on the second surface S2, thereby improving the brightness of the second virtual image 42 and the light utilization rate of the second image light. Here, it should be noted that useful second image light refers to second image light that forms the second virtual image 42, and in contrast, useless second image light refers to second image light that does not form the second virtual image 42. The meanings of "useful light" and "useless light" hereinafter are the same as here.

[0052] In addition, refer to Figure 4(a) and 4(b), during the imaging process, after the first image light reaches the transflective film 82 on the first surface S1, a part of the light is reflected and finally forms the first virtual image 41, and the other part will pass through the first surface S1, and be reflected by the second surface S2 and then transmitted by the first surface S1, forming a ghost image 41' of the first virtual image 41, resulting in a reduction in the display effect of the first virtual image 41. Therefore, the anti-reflection film 83 is arranged on the second surface S2 so that the first image light transmitted by the transflective film 82 on the first surface S1 can continue to be transmitted by the second surface S2, so that the useless first image light is emitted to the second surface S2 side, that is, the non-light-emitting side, thereby avoiding the occurrence of ghost images. Exemplarily, the reflectivity of the anti-reflection film 83 for light with a preset wavelength characteristic is less than or equal to 3%, preferably, the reflectivity is less than 1% or 0.1%, and more preferably, the reflectivity is less than 0.01%.

[0053] Continue to refer to Figure 3, the transflective film 82 disposed on the first surface S1 can reflect a portion of the light with a preset wavelength characteristic incident toward the first surface S1, and transmit another portion; and, for sunlight (or infrared light in sunlight) incident toward the first surface S1, the transflective 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). Specifically, when the backlight brightness of the first display panel 101 and the second display panel 102 is constant, the use of a transflective film 82 with different reflectivity (or transmittance) for light with a preset wavelength characteristic will change the brightness of the first virtual image 41 and the second virtual image 42. In order to achieve similar or identical brightness of the two virtual images, the brightness of the backlight source that provides light to the first display panel 101 and the second display panel 102 can be controlled. For example, the transmittance of the transflective film 82 to the light with the preset wavelength characteristic is greater than the reflectance, or the transmittance of the transflective film 82 and the anti-reflective film 83 as a whole to the light with the preset wavelength characteristic is greater than the reflectance of the transflective film 82 to the light with the preset wavelength characteristic. At this time, more useful second image light can be transmitted by the first surface S1, so more useful second image light can be transmitted through the light combining component 80 to finally form the second virtual image 42, and only a small part of the useful first image light can be reflected by the transflective 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. Therefore, in order to ensure that the brightness of the first virtual image 41 is equivalent to that of the second virtual image 42, the backlight brightness of the first display panel 101 can be increased, or the brightness of the second display panel 102 can be decreased, so that the backlight brightness of the first display panel 101 is greater than the backlight brightness of the second display panel 102. Alternatively, different backlight sources can be installed for the first display panel 101 and the second display panel 102 to reduce the cost of the product. Exemplarily, the transmittance and reflectance of the transflective film 82 for light with a preset wavelength characteristic may be: transmittance 80%, reflectance 20%; or, transmittance 60%, reflectance 40%, and so on.

[0054] Of course, the transmittance of the transflective film 82 to the light with the preset wavelength characteristics can also be set to be less than the reflectance, or the transmittance of the transflective film 82 and the anti-reflective film 83 as a whole to the light with the preset wavelength characteristics can be less than the reflectance of the transflective film 82 to the light with the preset wavelength characteristics. In this case, more useful first image light can be reflected by the transflective film 82 to finally form the first virtual image 41, and a smaller part of the useful second image light can be transmitted through the light combining component 80 to finally form the second virtual image 42. In order to ensure that the brightness of the first virtual image 41 is equivalent to that of the second virtual image 42, the brightness of the backlight source of the second display panel 102 is greater than the brightness of the backlight source of the first display panel 101. Exemplarily, the transmittance and reflectance of the transflective film 82 to the light with the preset wavelength characteristics can be: transmittance 40%, reflectance 60%; or transmittance 20%, reflectance 80%, etc. Of course, the transmittance and reflectance of the transflective film 82 or the transflective film 82 and the anti-reflective film 83 as a whole for light with preset wavelength characteristics can also be equal, that is, the transmittance and reflectance are both 50%. Under the premise that the brightness of the backlight source is the same, such a setting is conducive to ensuring the consistency of the brightness of the first virtual image 41 and the second virtual image 42, thereby improving the uniformity of the brightness of the two virtual images.

[0055] It should be noted that the transmittance of the transflective film 82 and the anti-reflection film 83 as a whole for a certain type of light (for example, light with a preset wavelength characteristic or infrared light, etc.) is the ratio of the light flux incident on the transflective film 82, which passes through the transflective film 82 and the anti-reflection film 83 in sequence, and finally passes through the anti-reflection film 83 to the incident light flux (that is, the light flux incident on the transflective film 82); or, it is the ratio of the light flux incident on the anti-reflection film 83, which passes through the anti-reflection film 83 and the transflective film 82 in sequence, and finally passes through the transflective film 82 to the incident light flux (that is, the light flux incident on the anti-reflection film 83).

[0056] Similarly, for sunlight (or infrared light in sunlight) incident toward the first surface S1, the transflective 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 allocating the incident sunlight (or infrared light) from the external environment to the first display panel 101 and the second display panel 102 in different proportions, thereby performing different temperature protection designs for the first display panel 101 and the second display panel 102.

[0057] In one example, the transmittance of the infrared light of the transflective film 82 is less than the reflectance, or the transmittance of the infrared light of the transflective film 82 and the anti-reflection film 83 as a whole is less than the reflectance of the infrared light of the transflective film 82. For example, the transmittance of the infrared light of the transflective film 82 is 20% to 40%, and the reflectance is 80% to 60%. It can be understood that when the transmittance is 40%, the reflectance is 60%, that is, the sum of the transmittance and the 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 The first heat conducting element 61 can remove the high temperature heat generated by the first display panel 101 due to long-term irradiation of the backlight source and / or infrared light, thereby reducing the temperature of the first display panel 101 and ensuring the normal operation of the first display panel 101.

[0058] In addition, a first filter element 71 may be disposed on the light emitting surface side of the first display panel 101, and the first filter element 71 may be disposed between the first display panel 101 and the first heat conducting element 61, or the first filter element 71 may be disposed on a side of the first heat conducting element 61 away from the first display panel 101. Figure 5 , the first heat-conducting element 61 is attached to the light-emitting surface of the first display panel 101, and the first filter element 71 is plated or attached to the surface of the first heat-conducting element 61 away from the light-emitting surface of the first display panel 101. Preferably, the first heat-conducting element 61 can be fully attached to the light-emitting surface of the first display panel 101. The first filter element 71 fully covers the light-emitting surface of the first display panel 101. Among them, the first filter element 71 is configured to transmit light with a preset wavelength characteristic, and reflect or absorb light without the preset wavelength characteristic; and / or, the first filter element 71 is configured to transmit light with a first polarization characteristic, and reflect or absorb light without the first polarization characteristic, wherein the first image light also has the first polarization characteristic. Light without the preset wavelength characteristic includes but is not limited to infrared light, light without the above three preset bands, and other light except for the preset wavelength characteristic. That is to say, the first filter element 71 can transmit the first image light, and reflect or absorb other light (such as infrared light). The first filter element 71 can absorb or reflect a portion of other light without affecting the emission of the first image light. Therefore, when external sunlight flows back into the HUD and propagates toward the first display panel 101, the first filter element 71 arranged on the light-emitting surface side of the first display panel 101 can absorb or reflect a portion of the light, thereby reducing the external light that can reach the surface of the first display panel 101 and alleviating the temperature rise of the first display panel 101 caused by absorbing the backflowing sunlight.

[0059] In another example, the transmittance of the transflective film 82 to infrared light is greater than the reflectance, or the transmittance of the transflective film 82 and the anti-reflective film 82 to infrared light as a whole 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 exiting side of the second display panel 102, such as Figure 8 As shown. In some examples, a second filter element 72 may also be provided on the light-emitting surface side of the second display panel 102. Wherein, the second filter element 72 is configured to: transmit light with a preset wavelength characteristic, reflect or absorb light without a preset wavelength characteristic; and / or transmit light with a second polarization characteristic, reflect or absorb light without a second polarization characteristic, wherein the second image light also has a second polarization characteristic. Here, the second heat-conducting element 62 is made of the same material and arranged in the same manner as the first heat-conducting element 61, and the working principles of the two are also similar. The second filter element 72 is arranged in the same manner as the first filter element 71, which will not be repeated here. Exemplarily, the transmittance of the transflective film 82 for infrared light is 60% to 80%, and the reflectivity is 40% to 20%. In some instances, the first polarization characteristic and the second polarization characteristic are the same, for example, both are S polarization characteristics or P polarization characteristics. Alternatively, the first polarization characteristic and the second polarization characteristic are different, for example, the first polarization characteristic is one of the S polarization characteristic and the P polarization characteristic, and the second polarization characteristic is the other of the S polarization characteristic and the P polarization characteristic.

[0060] Of course, the transmittance and reflectance of the transflective film 82 to infrared light may also be equal, that is, the transmittance and reflectance are both 50%, or the transmittance of the transflective film 82 and the anti-reflection film 82 to infrared light as a whole is equal to the reflectance of the transflective film 82 to infrared light. At this time, the external incident infrared light will be evenly irradiated to 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 may be provided on the light-emitting sides of 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 may be provided on the light-emitting side of the first display panel 101, and a second filter element 72 may be provided on the light-emitting side of the second display panel 102, such as Figure 8 As shown, the first filter element 71 is arranged on the side of the first heat conducting element 61 away from the first display panel 101, and the second filter element 72 is arranged on the side of the second heat conducting element 62 away from the second display panel 102. The provision of the heat conducting element and the filter element can ensure that the temperature of the first display panel 101 and the second display panel 102 will not be too high.

[0061] In some examples, the first heat-conducting element 61 and the second heat-conducting element 62 are made of materials with low thermal resistance, transparency, and good uniformity. For example, the thermal resistance of the first heat-conducting element 61 and the second heat-conducting element 62 are both less than or equal to 900K / W. The lower the thermal resistance of the heat-conducting element, the better the thermal conductivity. Preferably, the thermal resistance of the first heat-conducting element 61 and the second heat-conducting element 62 are both less than or equal to 600K / W, more preferably, the thermal resistance of the first heat-conducting element 61 and the second heat-conducting element 62 are both less than or equal to 300K / W, more preferably, the thermal resistance of the first heat-conducting element 61 and the second heat-conducting element 62 are both less than or equal to 100K / W, more preferably, the thermal resistance of the first heat-conducting element 61 and the second heat-conducting element 62 are both less than or equal to 50K / W, more preferably, the thermal resistance of the first heat-conducting element 61 and the second heat-conducting element 62 are both less than or equal to 20K / W.

[0062] In some examples, the thermal conductivity of the first thermally conductive element 61 and the second thermally conductive element 62 are both greater than or equal to 1.5 W / m*K. Preferably, the thermal conductivity of the first thermally conductive element 61 and the second thermally conductive element 62 are both greater than or equal to 2 W / m*K. More preferably, the thermal conductivity of the first thermally conductive element 61 and the second thermally conductive element 62 are both greater than or equal to 3 W / m*K.

[0063] The thermal resistance of the thermally conductive element can be calculated based on the thermal conductivity and thickness of the thermally conductive element. Once the thermal resistance range is determined, the thickness range of the thermally conductive element that meets the thermal resistance range can be determined in combination with the thermal conductivity of the thermally conductive element used; or, once the thermal resistance range that meets the requirements and the thickness of the thermally conductive element are determined, the thermal conductivity range of the thermally conductive element can be determined, and then a thermally conductive element that meets the thermal conductivity range can be used.

[0064] In some examples, on the basis that the thermal resistance of the first heat-conducting element 61 and the second heat-conducting element 62 meets the above range, the thickness of the first heat-conducting element 61 and the second heat-conducting element 62 is required to be greater than or equal to 0.01 mm and less than or equal to 15 mm. If the thickness of the heat-conducting element is too large, the cost will increase significantly, and when the thickness of the heat-conducting element is greater than a certain value, the improvement of the heat conduction effect on the display panel is not obvious. Preferably, the thickness of the first heat-conducting element 61 and the second heat-conducting element 62 is greater than or equal to 0.01 mm and less than or equal to 2 mm; for example, the thickness of the first heat-conducting element 61 and the second heat-conducting element 62 is 0.07 mm, or the thickness of the first heat-conducting element 61 and the second heat-conducting element 62 is 0.5 mm, or the thickness of the first heat-conducting element 61 and the second heat-conducting element 62 is 1 mm, or the thickness of the first heat-conducting element 61 and the second heat-conducting element 62 is 1.5 mm, or the thickness of the first heat-conducting element 61 and the second heat-conducting element 62 is 2 mm. Of course, the thicknesses of the first heat conducting element 61 and the second heat conducting element 62 may also be different, as long as the above requirements are met.

[0065] In some examples, the first heat-conducting element 61 and the second heat-conducting element 62 are both made of polycarbonate. In other examples, the first heat-conducting element 61 and the second heat-conducting element 62 are both made of high thermal conductivity glass, and the high thermal conductivity glass includes but is not limited to sapphire glass, aluminum oxide glass, high borosilicate glass, ultra-white glass, borosilicate glass, aluminum silicate glass, quartz glass, microcrystalline glass, spinel glass, graphene thermal glass, indium tin oxide glass, and nano-composite thermal glass. Preferably, the first heat-conducting element 61 and the second heat-conducting element 62 are both made of high thermal conductivity glass with a thermal conductivity greater than 3W / m*K, for example, the first heat-conducting element 61 and the second heat-conducting element 62 are both made of sapphire glass with a thermal conductivity of 25W / m*K. Sapphire glass not only has good thermal conductivity, but also has extremely high hardness and scratch resistance, so it can protect the screens of the first display panel 101 and the second display panel 102 and extend their service life.

[0066] In some examples, the first heat-conducting element 61 and the first display panel 101, as well as the second heat-conducting element 62 and the second display panel 102, can be fixedly connected by an adhesive layer, and the adhesive layer includes but is not limited to optical adhesive. The use of optical adhesive for fixing can make the display panel and the heat-conducting element be heated evenly, and can buffer the friction between the display panel and the heat-conducting element, thereby avoiding damage to the heat-conducting element.

[0067] In some examples, the first filter element 71 and the second filter element 72 are both selected from any one or more of an infrared reflective film, an infrared absorption film, a polarized reflective film, a polarized absorption film, and a preset band filter film. In some examples, the first filter element 71 and the second filter element 72 both include an infrared reflective film or an infrared absorption film, and also include any one or more selected from a polarized reflective film, a polarized absorption film, and a preset band filter film. For example, the infrared reflective film (or infrared absorption film) is stacked with any one or more selected from a polarized reflective film, a polarized absorption film, and a preset band filter film. The preset band filter film is configured to transmit light having the above three preset bands and reflect or absorb light not having the above three preset bands. Among them, the infrared reflective film can transmit the image light emitted by the display panel and reflect the backflowing infrared light. Specifically, the transmittance of the infrared reflective film to the image light can be 20% to 100%, such as 70%, 80%, 95%, etc., and the reflectivity to the infrared light can be 50% to 99%, such as 95%. The infrared absorption film can transmit the image light emitted by the display panel and absorb the infrared light that flows back. Specifically, the transmittance of the infrared absorption film to the image light can be 20% to 100%, such as 70%, 80%, 95%, etc., and the absorption rate to the infrared light can be 50% to 99%, such as 95%.

[0068] Among them, when the image light emitted by the display panel also has a preset polarization characteristic (including the first polarization characteristic or the second polarization characteristic), that is, the image light has the above-mentioned preset wavelength characteristic and the preset polarization characteristic, the image light can specifically be visible light with the preset polarization characteristic, or light with the preset polarization characteristic and three preset wavelength bands. The polarizing reflective film can pass through the image light with the preset polarization characteristic emitted by the display panel and reflect other polarized light; the polarizing absorption film can pass through the image light with the preset polarization characteristic emitted by the display panel and absorb other polarized light. For example, when the first image light also has the first polarization characteristic and the first filter element includes a polarizing reflective film, the polarizing reflective film can pass through the light with the first polarization characteristic, so the first image light can pass through the polarizing reflective film, and the polarizing reflective film can also reflect other polarized light (that is, light that does not have the first polarization characteristic).

[0069] In some examples, reference Figure 6 and Figure 8 The head-up display device further includes a first heat dissipation element 111, a first support member 121 and a first temperature sensor TP1 connected to the first heat-conducting element 61, and a second heat dissipation element 112, a second support member 122 and a second temperature sensor TP2 connected to the second heat-conducting element 62. The first heat dissipation element 111 is configured to dissipate heat derived from the first heat-conducting element 61, and the second heat dissipation element 112 is configured to dissipate heat derived from the second heat-conducting element 62. The first support member 121 is configured to support the first display panel 101, and the second support member 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.

[0070] Specifically, the first heat dissipation element 111 and the second heat dissipation element 112 can adopt any one of semiconductor cooling plates, liquid heat dissipation elements, and metal heat dissipation elements. Among them, the semiconductor cooling plate is also called a thermoelectric cooling plate, which is a heat pump. Its advantage is that there is no sliding part, and it is used in some places where space is limited, reliability is high, and there is no refrigerant pollution. The semiconductor cooling plate is composed of many N-type semiconductor and P-type semiconductor particles arranged with each other, and the N-type semiconductor and the P-type semiconductor are connected by a general conductor to form a complete circuit. The conductor is usually copper, aluminum or other metal conductors, and finally sandwiched by two ceramic sheets like a sandwich. The semiconductor cooling plate uses the Peltier effect of semiconductor materials. When direct current passes through a couple formed by two different semiconductor materials in series, heat can be absorbed and released at both ends of the couple respectively, and the purpose of cooling can be achieved. It is a refrigeration technology that produces negative thermal resistance, which is characterized by no moving parts and relatively high reliability.

[0071] Thermal grease or thermal glue may be provided for fixing between the first heat-conducting element 61 and the first heat-dissipating element 111, and between the second heat-conducting element 62 and the second heat-dissipating element 112. The use of thermal grease or thermal glue for fixing can make the heat dissipating element and the heat-conducting element be heated evenly, and can buffer the friction between the heat dissipating element and the heat-conducting element, thereby avoiding damage to the heat dissipating element.

[0072] In some examples, the first support member 121 and the second support member 122 may be made of metal. The support member may be used to support the display panel, and on the other hand, since the metal material has good thermal conductivity, the support member may dissipate heat from the display panel. In some examples, the support member may also be connected to a heat-conducting element, thereby also dissipating heat from the heat-conducting element.

[0073] Further, the first temperature sensor TP1 is in contact with at least one of the first support member 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 member 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 the surface of the first heat-conducting element 61 away from the light-emitting surface of the first display panel, and the second temperature sensor TP2 is attached to the surface of the second heat-conducting element 62 away from the light-emitting surface of the second display panel. The arrangement of the first display panel 101 and the first temperature sensor TP1 is the same as the arrangement of the second display panel 102 and the second temperature sensor TP2.

[0074] Taking the first display panel 101 as an example, in order to avoid the setting of the first temperature sensor TP1 affecting the display effect of the first display panel 101, the first temperature sensor TP1 and the orthographic projection of the light emitting surface of the first display panel 101 on the plane where the light emitting surface is located do not overlap. Preferably, the first temperature sensor TP1 is arranged on the surface of the first heat-conducting element 61 on the side away from the first display panel 101, for example, the first temperature sensor TP1 is arranged on the surface of the first heat-conducting element 61 on the side away from the first display panel 101, and the first temperature sensor TP1 and the orthographic projection of the light emitting surface of the first display panel 101 on the plane where the light emitting surface is located do not overlap. Setting the first temperature sensor TP1 on the first heat-conducting element 61 can avoid affecting the imaging while making the detected temperature closer to the actual temperature of the first display panel 101, thereby avoiding internal overheating of the first display panel 101.

[0075] In some examples, the head-up display device also includes a controller connected to the first temperature sensor TP1 and the second temperature sensor TP2. Taking the first temperature sensor TP1 as an example, its controller 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 drive circuit that controls the brightness of the backlight source, and the drive circuit responds to the first control instruction to reduce the luminous brightness of the backlight source. In another example, the controller can be connected to a heat sink (e.g., a fan), and the heat sink starts working in response to the first control instruction to reduce the temperature of the first display panel 101. Of course, the controller can also be connected to a reminder device (e.g., a breathing light), and the reminder device responds to the first control instruction and sends a reminder signal to remind the user to lower the brightness.

[0076] In some examples, the head-up display device further includes at least one reflective element 30, such as Figure 7 See Figure 7 , the light emitted from the light-emitting side of the light-combining component 80 can be reflected by the at least one reflective element 30 and then incident on an external imaging device for imaging. Exemplarily, the reflective element 30 includes a curved reflector, or the reflective element 30 includes a curved reflector and a plane mirror. The plane mirror can reflect the image light to the curved mirror, and the curved reflector can adjust the transmission direction of the image light, amplify the image, and then transmit it to the external imaging device. In one example, the head-up display device includes only one reflective element 30, which is a primary reflector 31, and the primary reflector 31 is a curved reflector. It can be understood that the image light emitted from the light-combining component 80 is reflected to the outside world by the reflective element 30, and the external infrared light can also be reflected to the light-combining component 80 by the reflective element 30, and further propagates toward the first display panel 101 and the second display panel 102. Therefore, a cutoff element 90 can be provided on the reflective surface of the primary reflector 31. The cutoff element 90 is configured to reflect light having a preset wavelength characteristic, that is, 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 on the light combining component 80. Exemplarily, the cutoff element 90 includes an outer transmission film or an infrared absorption film, and the cutoff element 90 covers the entire reflection surface of the primary reflector 31.

[0077] In another example, referring to Figure 7The head-up display device includes two reflective elements 30, namely a primary reflector 31 and a secondary reflector 32. Among them, the primary reflector 31 is a curved reflector, and the secondary reflector 32 is a plane mirror. The image light emitted from the light combining component 80 is first reflected by the plane mirror, and then reflected by the curved mirror to reach the external imaging device for imaging. Of course, the secondary reflector 32 can also be a curved reflector, and the present disclosure does not limit this. In some examples, a cutoff element 90 is provided on the reflective surface of at least part of the reflective element 30, for example, a cutoff element 90 is provided on the reflective surface of the primary reflector 31 or the secondary reflector 32. Figure 7 In the example, a cutoff element 90 is disposed on the reflective surface of the primary reflector 31 and the secondary reflector 32. The cutoff element 90 is configured to reflect light having a preset wavelength characteristic, that is, to reflect the first image light and the second image light, and to transmit or absorb infrared light to reduce the infrared light incident on the light combining component 80. Exemplarily, the cutoff element 90 includes an outer transmission film or an infrared absorption film, and the cutoff element 90 covers the entire reflective surface of the reflector where it is located.

[0078] Optionally, the curved reflector is a free-form reflector, that is, the reflective surface is a free-form reflector, or the reflective surface does not have rotational symmetry, so as to improve the imaging quality of the head-up display device.

[0079] In some examples, the backlight source that provides light for the first display panel 101 and the second display panel 102 may include light-emitting devices arranged in an array. The light-emitting devices may specifically be electroluminescent elements, such as light-emitting diodes (LED), organic light-emitting diodes (OLED), mini light-emitting diodes (MiniLED), micro light-emitting diodes (MicroLED), cold cathode fluorescent lamps (CCFL), electroluminescent displays (ELD), LED cold light sources (Cold LED Light, CLL), electroluminescent (EL), field emission display (FED), tungsten halogen lamps or metal halide lamps, etc., but the embodiments of the present disclosure are not limited to this.

[0080] In some embodiments, reference Figure 8The head-up display device may further include a housing 130, wherein 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 member 121, the second support member 122, the primary reflector 31, and the secondary reflector 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.

[0081] The disclosed embodiment also provides a traffic device, which includes the head-up display device and a windshield in the above embodiment. The windshield is used to reflect the image light emitted by the head-up display device to a preset area. When the observer's eyes are located in the preset area, the observer can simultaneously see the virtual image formed by the head-up display device.

[0082] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A head-up display device, comprising a first display panel, a second display panel and a light combining component; wherein: The light combining assembly includes a transparent substrate, a transflective film and an anti-reflective film; the transparent substrate includes a first surface and a second surface arranged opposite to each other along a thickness direction thereof; the transflective film is arranged on the first surface, and the anti-reflective film is arranged on the second surface; the first display panel is configured to emit a first image light toward the transflective film; the second display panel is configured to emit a second image light toward the anti-reflective 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; The anti-reflection film is configured to increase the transmittance of light with a preset wavelength characteristic on the second surface; both the first image light and the second image light have the preset wavelength characteristic.

2. The head-up display device according to claim 1, wherein: The transmittance of the transflective film to the light with the preset wavelength characteristic is less than its reflectivity, or the transmittance of the transflective film and the anti-reflection film as a whole to the light with the preset wavelength characteristic is less than the reflectivity of the transflective film to the light with the preset wavelength characteristic, and the backlight brightness of the second display panel is greater than the backlight brightness of the first display panel; the preset wavelength characteristic includes a visible light band or three preset bands.

3. The head-up display device according to claim 1, wherein: The transmittance of the transflective film to the light with the preset wavelength characteristic is greater than its reflectivity, or the transmittance of the transflective film and the anti-reflection film as a whole to the light with the preset wavelength characteristic is greater than the reflectivity of the transflective film to the light with the preset wavelength characteristic, and the backlight brightness of the first display panel is greater than the backlight brightness of the second display panel; the preset wavelength characteristic includes a visible light band or three preset bands.

4. The head-up display device according to claim 1, wherein: The transmittance of the transflective film to infrared light is lower than the reflectance, or the transmittance of the transflective film and the anti-reflective film as a whole to infrared light is lower than the reflectance of the transflective film to infrared light. A first heat-conducting element is provided on the light-emitting surface side of the first display panel; the first heat-conducting element is configured to conduct heat from the first display panel; or, The transmittance of the transflective film to infrared light is greater than the reflectance, or the transmittance of the transflective film and the anti-reflective film as a whole to infrared light is greater than the reflectance of the transflective film to infrared light, and a second heat conducting element is provided on the light exiting side of the second display panel; The second heat conducting element is configured to conduct heat away from the second display panel; or, The transmittance of the transflective film to infrared light is equal to the reflectance, or the transmittance of the transflective film and the anti-reflection film as a whole to infrared light is equal to the reflectance of the transflective film to infrared light. A first heat-conducting element is arranged on the light-emitting surface side of the first display panel, and a second heat-conducting element is arranged on the light-emitting surface side of the second display panel; the first heat-conducting element is configured to export heat from the first display panel, and the second heat-conducting element is configured to export heat from the second display panel.

5. The head-up display device according to claim 4, wherein: The first heat-conducting element is in contact with the light-emitting surface of the first display panel, and the second heat-conducting element is in contact with the light-emitting surface of the second display panel.

6. The head-up display device according to claim 4, wherein: The first heat-conducting element and the second heat-conducting element both include any one of polycarbonate, sapphire glass, alumina glass, high borosilicate glass, ultra-white glass, borosilicate glass, aluminosilicate glass, quartz glass, microcrystalline glass, spinel glass, graphene thermally conductive glass, indium tin oxide glass, and nano-composite thermally conductive glass.

7. The head-up display device according to claim 4, wherein: A first filter element is disposed on the light exiting surface side of the first display panel, and / or a second filter element is disposed on the light exiting surface side of the second display panel; wherein, The first filter element is configured to: transmit light with the preset wavelength characteristic, and reflect or absorb light without the preset wavelength characteristic; and / or transmit light with a first polarization characteristic, and reflect or absorb light without the first polarization characteristic, wherein the first image light also has the first polarization characteristic; The second filter element is configured to: transmit light with the preset wavelength characteristic, and reflect or absorb light without the preset wavelength characteristic; and / or transmit light with a second polarization characteristic, and reflect or absorb light without the second polarization characteristic, wherein the second image light also has the second polarization characteristic.

8. The head-up display device according to claim 7, wherein: The first filter element is plated or attached to a surface of the first heat-conducting element away from the light-emitting surface, and the second filter element is plated or attached to a surface of the second heat-conducting element away from the light-emitting surface.

9. The head-up display device according to claim 7, wherein: The first filter element and the second filter element are both 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 band filter film; or, the first filter element and the second filter element both include an infrared reflective film or an infrared absorbing film, and also include any one or more selected from a polarized reflective film, a polarized absorbing film, and a preset band filter film; The preset wavelength band filter film is configured to transmit light having three preset wavelength bands and reflect or absorb light not having the three preset wavelength bands.

10. The head-up display device according to claim 4, wherein: The head-up display device further includes a first heat dissipation element connected to the first heat-conducting element, a first support member, and a first temperature sensor; the first heat dissipation element is configured to dissipate heat conducted away by the first heat-conducting element; The first support member is configured to support the first display panel; The first temperature sensor is configured to detect the temperature of the first display panel, and the first temperature sensor is connected to at least one of the first heat conducting element, the first heat dissipating element, and the first supporting member; and / or, The head-up display device further includes a second heat dissipation element, a second support member, and a second temperature sensor connected to the second heat-conducting element; the second heat dissipation element is configured to dissipate heat conducted away by the second heat-conducting element; The second support member 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 heat conducting element, the second heat dissipating element, and the second supporting member.

11. The head-up display device according to claim 10, wherein: The first temperature sensor is attached to a surface of the first heat conducting element on a side away from the first display panel, and / or, The second temperature sensor is attached to a surface of the second heat conducting element at a side away from the second display panel.

12. The head-up display device according to claim 10, wherein: The head-up display device further includes a controller configured to send a first control instruction to reduce the temperature of the first display panel and the second display panel when the temperature sensed by the first temperature sensor or the second temperature sensor reaches a threshold.

13. The head-up display device according to claim 4, wherein: The thermal resistance of the first heat-conducting element and the second heat-conducting element are both less than or equal to 600K / W, or the thermal resistance of the first heat-conducting element and the second heat-conducting element are both less than or equal to 300K / W, or the thermal resistance of the first heat-conducting element and the second heat-conducting element are both less than or equal to 100K / W, or the thermal resistance of the first heat-conducting element and the second heat-conducting element are both less than or equal to 50K / W, or the thermal resistance of the first heat-conducting element and the second heat-conducting element are both less than or equal to 20K / W.

14. The head-up display device according to claim 13, wherein: The thermal conductivity of the first heat-conducting element and the second heat-conducting element are both greater than or equal to 1.5 W / m*K, or the thermal conductivity of the first heat-conducting element and the second heat-conducting element are both greater than or equal to 2 W / m*K, or the thermal conductivity of the first heat-conducting element and the second heat-conducting element are both greater than or equal to 3 W / m*K.

15. The head-up display device according to claim 13, wherein: The thickness of the first heat-conducting element and the second heat-conducting element both range from 0.01 mm to 15 mm, or the thickness of the first heat-conducting element and the second heat-conducting element both range from 0.01 mm to 2 mm.

16. The head-up display device according to claim 1, wherein: The head-up display device also includes at least one reflective element; the first image light reflected by the light combining component and the second image light transmitted by the light combining component are incident on the at least one reflective element, and after being reflected by the at least one reflective element, are incident on an external imaging device for imaging.

17. The head-up display device according to claim 1, wherein: The angle between the main optical axis of the first image light after being reflected by the light combining component and the main optical axis of the second image light after being transmitted by the light combining component is less than or equal to a preset angle; the value range of the preset angle is 0° to 10°.

18. A traffic device, comprising the head-up display device according to any one of claims 1 to 17.

Images