Head-up display system and vehicle

Abstract

The invention relates to a head-up display system and a vehicle, and in the head-up display system, each light-emitting module of a backlight source is independently controlled, and the target brightness of the corresponding light-emitting module is determined according to the brightness information of each display area of a display panel. The brightness of the light-emitting module corresponding to the display content area (namely the display area where the display image is located) is improved, the brightness of the light-emitting module corresponding to the non-content area (namely the perspective display area) is reduced, the power consumption and the heat production amount of the image generation unit are reduced, and the contrast ratio is also improved; and a P polarized light transflective film is arranged on the transflective imaging unit to improve the reflectivity of P polarized light, so that the brightness of a formed virtual image is improved, the brightness improvement degree of a backlight source is reduced, the power consumption and heat of the image generation unit are reduced, and the display panel is prevented from being damaged due to too high temperature.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a head-up display system and a vehicle. Background Art

[0002] The head up display (HUD) system is also called a head-up display system. By projecting the light emitted by the image generation unit of the HUD onto the imaging part, the driver is prevented from being distracted by looking down at the dashboard while driving, thereby improving driving safety and providing a better driving experience.

[0003] In the related art, in order to enable the user to see the HUD image when wearing polarized sunglasses, the image light emitted by the HUD image generation unit is controlled to be P-polarized light. However, due to the low reflectivity of P-polarized light, the brightness of the virtual image formed is low, and the user cannot see a clear virtual image. In the related art, the brightness requirement of a clear virtual image is met by increasing the brightness of the image generation unit. However, the power consumption and heat generation of the image generation unit also increase, which causes the display panel of the image generation unit to be damaged due to excessive temperature. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides a head-up display system and a vehicle.

[0005] In a first aspect, the present disclosure provides a head-up display system, comprising:

[0006] An image generating unit; the image generating unit comprises a display panel and a backlight source, the display panel comprises at least two display areas, the backlight source comprises at least two light-emitting modules, the display areas correspond to the light-emitting modules one by one; the backlight source is configured to determine the target brightness of the corresponding light-emitting module according to the brightness information of each display area of ​​the display panel; the display panel emits at least P polarized light;

[0007] A transflective imaging unit; the transflective imaging unit includes a P-polarized light transflective film, which is used to reflect the P-polarized light emitted by the display panel to the eye box area to form a virtual image; wherein the reflectivity of the P-polarized light transflective film to P-polarized light is greater than the reflectivity to S-polarized light.

[0008] Optionally, the P-polarized light transflective film comprises:

[0009] A dielectric layer and a metal layer, wherein the dielectric layer and the metal layer are stacked; along the stacking direction, the dielectric layer is located on both sides of the metal layer;

[0010] At least one of the dielectric layers includes a first sub-dielectric layer and a second sub-dielectric layer alternately stacked along the stacking direction, and the refractive index of the first sub-dielectric layer is greater than the refractive index of the second sub-dielectric layer.

[0011] Optionally, the refractive index of the first sub-medium layer is greater than or equal to 2.0, and the refractive index of the second sub-medium layer is less than or equal to 1.7.

[0012] Optionally, the first sub-dielectric layer includes at least one of a titanium dioxide layer, a titanium pentoxide layer, a tantalum pentoxide layer, a niobium pentoxide layer and a lanthanum titanate layer; and / or,

[0013] The second sub-dielectric layer includes at least one of a silicon dioxide layer, an aluminum oxide layer and a silicon-aluminum mixed layer.

[0014] Optionally, the single layer thickness of the first sub-dielectric layer is 10 nm to 100 nm, and / or the single layer thickness of the second sub-dielectric layer is 15 nm to 150 nm.

[0015] Optionally, along the stacking direction, the two sub-dielectric layers in contact with the metal layer are both first sub-dielectric layers, or both are second sub-dielectric layers, or one of them is the first sub-dielectric layer and the other is the second sub-dielectric layer; and / or,

[0016] In a single dielectric layer, the number of the first sub-dielectric layers is less than or equal to 10, and the number of the second sub-dielectric layers is less than or equal to 10.

[0017] Optionally, the metal layer includes at least one of a silver reflective layer, a gold reflective layer, a copper reflective layer and an aluminum reflective layer; and / or,

[0018] The single layer thickness of the metal layer is 1 nm to 50 nm.

[0019] Optionally, the P-polarized light transflective film further includes a support layer;

[0020] Along the stacking direction, the support layer is located on at least one side of the metal layer, and the support layer is in contact with the metal layer.

[0021] Optionally, the total number of layers of the P-polarized light transflective film is less than or equal to 30, and / or the overall thickness of the P-polarized light transflective film is 100 nm to 800 nm.

[0022] Optionally, when the incident angle of the P-polarized light is 20° to 70°, the reflectivity of the P-polarized light transflective film to the P-polarized light is greater than or equal to 20%.

[0023] Optionally, the head-up display system further includes: a control module; the control module is specifically used to:

[0024] Determining a pixel group corresponding to each of the display areas according to an image to be displayed on the display panel;

[0025] The brightness information of each of the display areas is determined according to the pixel value of the pixel group corresponding to each of the display areas.

[0026] Optionally, the control module is specifically configured to determine the brightness information of each display area according to the pixel value of the pixel group corresponding to each display area, including:

[0027] Determine the brightness value of each pixel according to the pixel value of each pixel in the pixel group corresponding to each display area;

[0028] A weighted average of the brightness values ​​of all the pixels in the pixel group is calculated to obtain brightness information corresponding to each of the display areas.

[0029] Optionally, the control module is specifically configured to determine the brightness information of each display area according to the pixel value of the pixel group corresponding to each display area, including:

[0030] Determine the brightness value of each pixel according to the pixel value of each pixel in the pixel group corresponding to each display area;

[0031] Comparing the brightness value of each pixel with a preset threshold value to obtain a comparison result of each display area;

[0032] The brightness information of each display area is determined according to the comparison result of each display area.

[0033] Optionally, the control module is further used for:

[0034] Determine the brightness adjustment value corresponding to each of the light-emitting modules according to the external environment brightness;

[0035] Each of the light-emitting modules is controlled based on the target brightness and the brightness adjustment value corresponding to each of the light-emitting modules.

[0036] Optionally, each of the light-emitting modules includes at least one light-emitting element, and the control module controls each of the light-emitting elements; and / or,

[0037] Each of the light-emitting modules emits polarized light that matches the P-polarized light transflective film.

[0038] In a second aspect, the present disclosure further provides a means of transportation, comprising: any one of the above-mentioned head-up display systems.

[0039] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0040] The head-up display system provided by the present disclosure includes: an image generating unit; the image generating unit includes a display panel and a backlight source, the display panel includes at least two display areas, the backlight source includes at least two light-emitting modules, and the display areas correspond to the light-emitting modules one by one; the backlight source is configured to determine the target brightness of the corresponding light-emitting module according to the brightness information of each display area of ​​the display panel; the display panel emits at least P polarized light; a transflective imaging unit; the transflective imaging unit includes a P polarized light transflective film, the P polarized light transflective film is used to reflect the P polarized light emitted by the display panel to the eye box area to form a virtual image; wherein the reflectivity of the P polarized light transflective film to the P polarized light is greater than the reflectivity to the S polarized light. Therefore, on the one hand, by individually controlling each light-emitting module and determining the target brightness of the corresponding light-emitting module according to the brightness information of each display area of ​​the display panel, the brightness of the light-emitting module corresponding to the display content area (i.e., the display area where the display image is located) is increased, and the brightness of the light-emitting module corresponding to the content-free area (i.e., the perspective display area) is reduced, which not only reduces the power consumption and heat generation of the image generation unit but also improves the contrast. On the other hand, by setting a P-polarized light transflective film in the transflective imaging unit to increase the reflectivity of P-polarized light, the brightness of the virtual image formed is increased, the degree to which the backlight source increases the brightness is reduced, which is also beneficial to reducing the power consumption and heat of the image generation unit, thereby preventing the display panel from being damaged due to excessive temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0043] Figure 1 A schematic diagram of the structure of a head-up display system provided in an embodiment of the present disclosure;

[0044] Figure 2 A schematic diagram of the structure of an image generation unit provided in an embodiment of the present disclosure;

[0045] Figure 3 A schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure;

[0046] Figure 4 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0047] Figure 5 A schematic diagram of the structure of a backlight source provided by an embodiment of the present disclosure;

[0048] Figure 6 A schematic diagram of the structure of another image generation unit provided in an embodiment of the present disclosure;

[0049] Figure 7 A schematic structural diagram of a P-polarized light transflective film provided in an embodiment of the present disclosure;

[0050] Figure 8 A schematic structural diagram of another P-polarized light transflective film provided in an embodiment of the present disclosure;

[0051] Fig. 9 A schematic structural diagram of another P-polarized light transflective film provided in an embodiment of the present disclosure;

[0052] Fig.10 A schematic structural diagram of another P-polarized light transflective film provided in an embodiment of the present disclosure;

[0053] Fig.11 A schematic structural diagram of another P-polarized light transflective film provided in an embodiment of the present disclosure;

[0054] Fig.12 A schematic structural diagram of another P-polarized light transflective film provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0055] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0056] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0057] The head-up display system and transportation tool provided in the embodiments of the present disclosure are exemplarily described below with reference to the accompanying drawings.

[0058] In some embodiments, Figure 1-5 As shown, Figure 1 A schematic diagram of the structure of a head-up display system provided in an embodiment of the present disclosure is shown in FIG. Figure 2 A schematic diagram of the structure of an image generation unit provided in an embodiment of the present disclosure is shown in FIG. Figure 3 A schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure is shown in FIG. Figure 4A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure, Figure 5 This is a schematic diagram of the structure of a backlight source provided by an embodiment of the present disclosure. Figure 1-5 The head-up display system includes: an image generating unit 3 and a transflective imaging unit 2; wherein the image generating unit 3 includes a display panel 31 and a backlight source 32, the display panel 31 includes at least two display areas 311, the backlight source 32 includes at least two light-emitting modules 321, and the display areas 311 correspond to the light-emitting modules 321 one by one; the backlight source 32 is configured to determine the target brightness of the corresponding light-emitting module 321 according to the brightness information of each display area 311 of the display panel 31; the display panel 31 emits at least P polarized light; the transflective imaging unit 2 includes a P polarized light transflective film 1, the P polarized light transflective film 1 is used to reflect the P polarized light emitted by the display panel 31 to the eye box area 5 to form a virtual image 4; the reflectivity of the P polarized light transflective film 1 to the P polarized light is greater than the reflectivity to the S polarized light.

[0059] Combination Figure 2 The image generation unit 3 includes a display panel 31 and a backlight source 32. The shape and size of the backlight source 32 correspond to those of the display panel 31. The backlight source 32 is used to provide backlight to the display panel 31. The side of the display panel 31 close to the backlight source 32 is the light incident side, and the side away from the backlight source 32 is the light exit side. The backlight source 32 emits light to the display panel 31. The light incident side of the display panel 31 allows at least part of the polarized light in the light source to pass through, so that the light exit side of the display panel 31 emits image light with P polarized light.

[0060] The display panel 31 includes all types of display panels known to those skilled in the art, such as a liquid crystal display panel (LCD), a twisted nematic panel (TN), a vertical alignment panel (VA) or an in-plane switching panel (IPS), but is not limited here.

[0061] The backlight source 32 may be an electroluminescent device, such as a light emitting diode (LED), an incandescent lamp, a laser, a quantum dot light source, etc. Specifically, the backlight source 32 may be an organic light emitting diode (OLED), a mini light emitting diode (Mini LED), a micro light emitting diode (Micro LED), a cold cathode fluorescent lamp (CCFL), an electroluminescent display (ELD), a cold LED light source (Cold LED Light, CLL), an electroluminescent (EL), a field emission display (FED), a halogen tungsten lamp, a metal halide lamp, etc. The light emitted by the backlight source 32 is generally light with multi-polarization characteristics, such as natural light.

[0062] like Figure 3 As shown, the entire display area of ​​the display panel 31 includes a display content area (i.e., a display area where the display image is located) and a content-free area (i.e., a perspective display area), wherein most of the display area is a content-free area, which does not require a backlight, and only the content-free area requires a backlight. In the related art, backlight is provided to all display areas of the display panel, that is, all light-emitting elements in the backlight source are lit, and then the light energy of the light source light emitted by the corresponding light-emitting element in the content-free area is converted into heat energy by means of shielding, refraction, reflection, and absorption, so as to achieve no light emission from the content-free area. This method has problems such as high energy consumption and energy waste.

[0063] Combination Figure 4-5The display panel 31 includes at least two display areas 311, and the backlight source 32 includes the same number of light-emitting modules 321 as the display areas 311. The light-emitting modules 321 correspond to the display areas 311 one by one, and the light-emitting modules 321 provide backlight to the corresponding display areas 311; each light-emitting module includes at least one light-emitting element 3211. The backlight source 32 independently adjusts the light-emitting modules 321 corresponding to each display area 311, and independently controls the opening and closing and / or brightness of each light-emitting module 321 to achieve regional control. The backlight source 32 can control the light-emitting brightness of the corresponding light-emitting module 321 to be the target brightness according to the brightness information of each display area 311 of the display panel 31. For example, according to the distribution of the display image on the display panel 31, the brightness of the light-emitting module 321 corresponding to the display content area (i.e., the display area where the display image is located) is increased to meet the brightness requirement of a clear virtual image, and the brightness of the light-emitting module 321 corresponding to the content-free area (i.e., the perspective display area) is reduced. Since there is no display image distributed in this part of the display area, the light-emitting module 321 in this part of the display area may even be turned off, thereby minimizing the power consumption and heat generation of the image generation unit 3, thereby reducing the heat received by the display panel 31, thereby preventing the display panel 31 from being damaged due to excessive temperature, and at the same time improving the contrast.

[0064] Among them, the transflective imaging unit 2 includes a P-polarized light transflective film 1, and the reflectivity of the P-polarized light transflective film 1 to P polarized light is greater than the reflectivity to S polarized light; by providing a P-polarized light transflective film on the transflective imaging unit 2, the reflectivity of the P polarized light in the image light is increased, thereby increasing the brightness of the virtual image 4, which is beneficial for the user to see the clear virtual image 4, reduces the degree to which the backlight source 32 increases the brightness to a certain extent, and is also beneficial to reducing the power consumption and heat of the image generation unit 3, thereby preventing the display panel 31 from being damaged due to excessive temperature.

[0065] In the related art, when P-polarized light enters the windshield at a certain angle within a large range of incident angles, a portion of the P-polarized light incident on the windshield will become S-polarized light. Since the reflectivity of S-polarized light is greater than that of P-polarized light, the reflectivity of this portion of S-polarized light on the windshield becomes higher, causing the generated virtual image to have more obvious ghosting, thereby affecting the clarity of the virtual image and the speed and accuracy at which users read information.

[0066] In the disclosed embodiment, a P-polarized light transflective film 1 having a high reflectivity for P-polarized light is provided in the transflective imaging unit 2, and the image generating unit 3 is controlled to emit image light having P-polarized light and a suitable incident angle, so that not only the user can clearly see the virtual image formed by the P-polarized light reflected by the P-polarized light transflective film 1, but also the reflectivity of the transflective imaging unit 2 for the reflected S-polarized light is low, and the windshield of the transflective imaging unit 2 hardly reflects the P-polarized image light, so that the image light will not form a ghost image after being reflected by the transflective imaging unit 2 or the effect of the ghost image will be small; at the same time, even if the driver wears polarized sunglasses that project P-polarized light, the image formed by the head-up display system can be clearly seen. For example, the "large incident angle range" mentioned above can be 20° to 70°, and a certain specific angle can be 20° or 70°.

[0067] For example, Figure 1 As shown, the P-polarized light transflective film 1 is located on the side of the transflective imaging unit 2 facing the eye box area 5; the image generating unit 3 emits image light including at least P-polarized light, the P-polarized light is incident on the P-polarized light transflective film 1 and is reflected to the eye box area 5, and the user can observe the virtual image 4 located on the side of the transflective imaging unit 2 away from the eye box area 5 in the eye box area 5.

[0068] It should be noted that Figure 1 The transflective imaging unit 2 is shown as a windshield, and the P-polarized light transflective film 1 is disposed on the side of the windshield facing the eye box area 5, but this does not constitute a limitation on the head-up display system provided by the embodiment of the present disclosure. In other embodiments, the P-polarized light transflective film 1 can be disposed on the side of the windshield away from the eye box area. If the windshield is a laminated windshield, which is composed of an inner glass plate and an outer glass plate, the P-polarized light transflective film 1 can also be disposed on the two opposite surfaces of the inner glass plate and one of the two opposite surfaces of the outer glass plate; the transflective imaging unit 2 can also be a post-installed imaging plate, which is not limited here.

[0069] The head-up display system provided by the embodiment of the present disclosure includes: an image generating unit 3; the image generating unit includes a display panel 31 and a backlight source 32, the display panel 31 includes at least two display areas, the backlight source 32 includes at least two light-emitting modules, and the display areas correspond to the light-emitting modules one by one; the backlight source 32 is configured to determine the target brightness of the corresponding light-emitting module according to the brightness information of each display area of ​​the display panel 31; the display panel 31 emits at least P polarized light; a transflective imaging unit 2; the transflective imaging unit 2 includes a P polarized light transflective film 1, the P polarized light transflective film 1 is used to reflect the P polarized light emitted by the display panel 31 to the eye box area to form a virtual image 4; wherein the reflectivity of the P polarized light transflective film 1 to P polarized light is greater than the reflectivity to S polarized light. Therefore, on the one hand, by individually controlling each light-emitting module 321, the target brightness of the corresponding light-emitting module 321 is determined according to the brightness information of each display area 311 of the display panel 31, the brightness of the light-emitting module 321 corresponding to the display content area (i.e., the display area where the display image is located) is increased, and the brightness of the light-emitting module 321 corresponding to the content-free area (i.e., the perspective display area) is reduced, which not only reduces the power consumption and heat generation of the image generation unit 3 but also improves the contrast; on the other hand, by setting a P-polarized light transflective film 1 on the transflective imaging unit 2 to increase the reflectivity of the P-polarized light, thereby increasing the brightness of the virtual image 4, reducing the degree to which the backlight source 32 increases the brightness, and is also beneficial to reducing the power consumption and heat of the image generation unit 3, thereby preventing the display panel 31 from being damaged due to excessive temperature.

[0070] In some embodiments, the head-up display system also includes: a control module; the control module is specifically used to: determine the pixel group corresponding to each display area according to the image to be displayed on the display panel; determine the brightness information of each display area according to the pixel value of the pixel group corresponding to each display area.

[0071] The control module is electrically connected to the image generation unit, and the image generation unit is controlled to display an image through the control module. The display panel includes at least two display areas, each display area includes at least one pixel group, each pixel group includes at least one pixel, and the number of pixels corresponds to the resolution of the display panel; the pixel includes a filter of three primary colors of red, green and blue (RGB), and the filter will filter the light source light emitted by the backlight source to display different colors; the change of the pixel display color is achieved by adjusting the transmittance of the three primary color filter. According to the input video image signal, the control module will refresh the transmittance of the three primary color filter corresponding to each pixel line by line, so that the pixels of different colors are combined to present the required color picture.

[0072] In this embodiment, the control module is used to calculate the pixel value of the pixel group corresponding to each display area (including the content display area and the content-free area) according to the distribution of the image to be displayed on the display panel, and then determine the brightness information of each display area; the backlight source controls the luminous brightness of the corresponding display module according to the brightness information of each display area, and the brightness of the luminous module can be different, thereby realizing regional control of the backlight source.

[0073] Exemplarily, the control module calculates the pixel value or grayscale value of each display area based on the video image signal and takes the pixel group as the minimum display unit, and determines that if the pixel value or grayscale value exceeds a preset threshold, it is a bright area (corresponding to the display content area), otherwise it is a dark area (corresponding to the content-free area), and when the light-emitting module is turned on, the brightness of the light-emitting module corresponding to the bright area is controlled to be b1, and the brightness of the light-emitting module corresponding to the dark area is controlled to be b2, and b1 is greater than or equal to b2.

[0074] Exemplarily, the bright area and the dark area can be distinguished by:

[0075] According to the following formula, the RGB data in the received video image signal is converted into a color gamut to obtain the grayscale value corresponding to each display area.

[0076] gray=0.299×R+0.587×G+0.114×B;

[0077] When the calculated grayscale value corresponding to the display area is greater than the first preset value, the display area is determined to be a bright area; when the calculated grayscale value corresponding to the display area is greater than the second preset value but less than the first preset value, the display area is determined to be a dark area; when the calculated grayscale value corresponding to the display area is less than the third preset value, the display area is determined to be a content-free area; wherein the third preset value is less than or equal to the second preset value, and the second preset value is less than the first preset value. In this way, the power consumption of the image generation unit is further saved and the contrast of the virtual image of the head-up display system is improved.

[0078] In some embodiments, the control module is specifically used to determine the brightness information of each display area based on the pixel value of the pixel group corresponding to each display area, including: determining the brightness value of each pixel based on the pixel value of each pixel in the pixel group corresponding to each display area; calculating the weighted average of the brightness values ​​of all pixels in the pixel group to obtain the brightness information corresponding to each display area.

[0079] In this embodiment, the pixel is used as the smallest display unit, the pixel value or grayscale value of all pixels in each display area is obtained, and the brightness value of each pixel is determined accordingly; then the grayscale value of each pixel in each display area is weighted (the weight is generally the square of the grayscale value), and the average value is calculated based on the number of pixels as the brightness information of the area.

[0080] In some embodiments, the control module is specifically used to determine the brightness information of each display area based on the pixel value of the pixel group corresponding to each display area, including: determining the brightness value of each pixel based on the pixel value of each pixel in the pixel group corresponding to each display area; comparing the brightness value of each pixel with a preset threshold to obtain a comparison result for each display area; determining the brightness information of each display area based on the comparison result of each display area.

[0081] In this embodiment, a pixel is used as the smallest display unit, and the pixel value or grayscale value of all pixels in each display area is obtained, and the brightness value of each pixel is determined accordingly; then the maximum value of the pixels in the display area is compared with a preset threshold value, and if the maximum value is greater than the preset threshold value, the light-emitting module corresponding to the display area is turned on, otherwise the light-emitting module corresponding to the display area is turned off.

[0082] According to the calculation formula of gray grayscale value, gray=0 and RGB are both equal to 0, which is equivalent. In this way, the color gamut conversion can be omitted and RGB can be directly judged. At the same time, the delay is very low, and the image data output can be processed without delay. After the pixel statistics in each display area are completed, the control data of the display module corresponding to the display area can be obtained.

[0083] In some embodiments, the control module is further used to: determine a brightness adjustment value corresponding to each light-emitting module according to the external environment brightness; and control each light-emitting module based on the target brightness and the brightness adjustment value corresponding to each light-emitting module.

[0084] Among them, the control module is also used to output a brightness adjustment value according to the ambient brightness adaptive adjustment or receiving manual settings, and to determine the target brightness of the corresponding light-emitting module according to the brightness information of each display area of ​​the display panel; and to independently control each light-emitting module according to the target brightness and the brightness modulation value.

[0085] In some embodiments, each light-emitting module includes at least one light-emitting element, and the control module controls each light-emitting element.

[0086] For example, Figure 6 As shown, each light-emitting module 321 includes a light-emitting element 3211, and the control module independently controls each light-emitting element.

[0087] In some embodiments, each light-emitting module emits polarized light that is compatible with the P-polarized light transmissive and reflective film.

[0088] Among them, the P-polarized light transflective film has a high reflectivity for P-polarized light, so it is necessary to control the image light source emitted by the image generation unit to include at least P-polarized light. When a polarization conversion element is provided between the display panel and the backlight source, the light-emitting module is controlled to emit S-polarized light, and the polarization conversion element converts the S-polarized light into P-polarized light, and the P-polarized light can be incident on the light incident side of the display panel, thereby realizing that the display panel emits P-polarized light; when no polarization conversion element is provided between the display panel and the backlight source, the light-emitting module is controlled to emit P-polarized light, and the P-polarized light can be incident on the light incident side of the display panel, thereby realizing that the display panel emits P-polarized light.

[0089] In other embodiments, a transflective element may be provided between the display panel and the backlight source, and the transflective element has the property of transmitting P polarized light and reflecting S polarized light. With such a configuration, the P polarized light in the light source light emitted by the display module is incident on the light incident side of the display panel and is emitted from the light emitting side of the display panel.

[0090] In some embodiments, Figure 6 As shown, the backlight source 32 further includes a collimating structure 323 . The collimating structure 323 is located on the light emitting side of the backlight source 32 , and the collimating structure 323 is located between the display panel 31 and the backlight source 32 .

[0091] For example, Figure 6 As shown, the image generation unit includes a display panel 31 and a backlight source, the backlight source includes at least a lamp board and a collimating structure 323, the lamp board includes a plurality of light-emitting elements 3211 and a backlight circuit board 322, the light-emitting elements 3211 are arranged on the backlight circuit board 322, and the opening and closing and / or brightness of at least two light-emitting elements 3211 are independent of each other and can be adjusted separately. In this way, the backlight source 32 is adjusted in different regions, and the power consumption is minimized while meeting the brightness requirements of each display content in the virtual image, thereby reducing the heat received by the display panel 31, thereby preventing the display panel 31 from being damaged due to excessive temperature.

[0092] In some embodiments, Figure 7-9 As shown, the P-polarized light transflective film 1 includes: a dielectric layer 11 and a metal layer 12, wherein the dielectric layer 11 and the metal layer 12 are stacked; along the stacking direction X, the dielectric layer 11 is located on both sides of the metal layer 12; at least one dielectric layer 11 includes a first sub-dielectric layer 111 and a second sub-dielectric layer 112 alternately stacked along the stacking direction X, and the refractive index of the first sub-dielectric layer 111 is greater than the refractive index of the second sub-dielectric layer 112.

[0093] The P-polarized light transflective film 1 is a multi-layer structure, including a dielectric layer 11 and a metal layer 12 stacked, wherein the number of layers of the metal layer 12 is at least one; along the stacking direction X of the dielectric layer 11 and the metal layer 12, a dielectric layer 11 is disposed above and below each metal layer 12. In the multi-layer structure of the transflective film, at least one dielectric layer 11 includes a first sub-dielectric layer 111 and a second sub-dielectric layer 112 alternately stacked, and the refractive index of the first sub-dielectric layer 111 is greater than the refractive index of the second sub-dielectric layer 112.

[0094] In this way, the metal layer 12 can improve the reflectivity of the P-polarized light transflective film 1 to P-polarized light and S-polarized light as a whole; on this basis, the dielectric layer 11 formed by the alternating stacking of the first sub-medium layer 111 and the second sub-medium layer 112 with two different refractive indices can adjust the reflectivity of P-polarized light and S-polarized light to obtain a higher P-polarized light reflectivity and a lower S-polarized light reflectivity. It is applied to the head-up display system, and according to the polarization type of the image light (P-polarized light or S-polarized light), the reflectivity of the image light is improved by using the corresponding transflective film, which is conducive to improving the display brightness and display effect of the image.

[0095] For example, Figure 7 As shown, the P-polarized light transflective film 1 includes: a metal layer 12 and a dielectric layer 11 stacked with the metal layer 12; wherein, along the stacking direction X, the metal layer 12 is located between two dielectric layers 11, the dielectric layer 11 located above the metal layer 12 includes a first sub-dielectric layer 111 and a second sub-dielectric layer 112 stacked alternately, and the dielectric layer 11 located below the metal layer 12 includes only a first sub-dielectric layer 111.

[0096] For example, Figure 8 As shown, the P-polarized light transflective film 1 includes: a metal layer 12 and a dielectric layer 11 stacked with the metal layer 12; wherein, along the stacking direction X, the metal layer 12 is located between two dielectric layers 11, the dielectric layer 11 located above the metal layer 12 includes a first sub-dielectric layer 111 and a second sub-dielectric layer 112 stacked alternately, and the dielectric layer 11 located below the metal layer 12 includes only a second sub-dielectric layer 112.

[0097] For example, Fig. 9 As shown, the P-polarized light transflective film 1 includes: a metal layer 12 and a dielectric layer 11 stacked with the metal layer 12; wherein, along the stacking direction X, the metal layer 12 is located between two dielectric layers 11, the dielectric layer 11 located above the metal layer 12 includes a first sub-dielectric layer 111 and a second sub-dielectric layer 112 stacked alternately, and the dielectric layer 11 located below the metal layer 12 also includes a first sub-dielectric layer 111 and a second sub-dielectric layer 112 stacked alternately.

[0098] It should be noted that the embodiment of the present disclosure does not limit the number of layers of the first sub-dielectric layer 111 and the second sub-dielectric layer 112 in the dielectric layer 11. Figure 7-9 The number of first sub-dielectric layers 111 is greater than the number of second sub-dielectric layers 112 by way of example only. The number of first sub-dielectric layers 111 may be equal to the number of second sub-dielectric layers 112 or the number of first sub-dielectric layers 111 may be less than the number of second sub-dielectric layers 112 .

[0099] The thickness of the metal layer 12, the first sub-medium layer 111 and the second sub-medium layer 112 are all in nanometer level, and the P-polarized light transflective film 1 has high light transmittance. In this way, when the P-polarized light transflective film 1 is arranged in the transflective imaging unit 2, it will not hinder the user from seeing the target object in the external environment clearly.

[0100] In other embodiments, the thickness and arrangement combination of the first sub-medium layer 111 and the second sub-medium layer 112 can be adjusted to make the transflective film become an S-polarized light transflective film, whose reflectivity to S-polarized light is greater than that to P-polarized light; applying the S-polarized light transflective film to the head-up display system can further improve the display brightness and display effect of the image, or reduce the brightness of the backlight source 32 while maintaining the same display brightness, which is beneficial to reducing the power consumption and heat of the image generation unit 3, thereby preventing the display panel 31 from being damaged due to excessive temperature.

[0101] In some embodiments, when the P-polarized light transflective film is within the first incident angle range, within at least half of the wavelength range of 390nm to 780nm, the reflectivity of the P-polarized light transflective film to P-polarized light is greater than or equal to 20%, and the reflectivity to S-polarized light is less than 20%.

[0102] Wherein, the first incident angle range is: 20°~70°. The wavelength range of visible light is: 390nm~780nm, and the corresponding wavelength span is 390nm; if the wavelength range is between 390nm~780nm and the wavelength span is greater than or equal to the wavelength range of 195nm, then the wavelength range covers at least half of the wavelength range of visible light. Exemplarily, the wavelength range is 400nm~700nm, and the corresponding wavelength span is 300nm.

[0103] It can be understood here that the incident angle of the head-up display system is a fixed preset angle when in use, for example, the incident angle is 50° or 60°; under different use conditions (for example, in different vehicles), the incident angle can be adjusted, for example, the incident angle is 50° in the first vehicle and 60° in the second vehicle. Within the first incident angle range, any incident angle of any value can meet the requirements of the reflectivity of polarized light of the transflective film disclosed in the present invention.

[0104] When the incident angle is within the first incident angle range, within at least half of the wavelength range of visible light, the reflectivity of the P-polarized light transflective film to P-polarized light is greater than or equal to 20%, and the reflectivity to S-polarized light is less than 20%. For example, when the incident angle is 50°, within at least half of the wavelength range of visible light, the reflectivity of the P-polarized light transflective film to P-polarized light is greater than 25%, and the reflection green of S-polarized light is less than 20%. For another example, when the incident angle is 60°, within at least half of the wavelength range of visible light, the reflectivity of the P-polarized light transflective film to P-polarized light is greater than 30%, and the reflection green of S-polarized light is less than 20%. For another example, when the incident angle is 60°, within the wavelength range of 400nm to 700nm, the reflectivity of the P-polarized light transflective film to P-polarized light is greater than 30%; within the wavelength range of 450nm to 600nm, the reflectivity of the P-polarized light transflective film to S-polarized light is less than 25%.

[0105] In some embodiments, when the P-polarized light transflective film is within the second incident angle range, the reflectivity fluctuation range of the first polarized light within the wavelength range of 390nm to 780nm is less than 30%.

[0106] Among them, the second incident angle range is less than or equal to the first incident angle range, and it is within the first incident angle range, that is, the second incident angle range is included in the first incident angle range. For example, if the first incident angle range is: 20°~70°, then the second incident angle range can be 20°~70°, or 20°~50°, or 50°~70°. The reflectivity fluctuation range refers to the difference between the maximum and minimum reflectivity of the transflective film to P polarized light within the visible light range within the second incident angle range.

[0107] Exemplarily, when the incident angle is 60°, in the visible light range (wavelength range of 390nm to 780nm), the fluctuation range of the reflectivity of the P-polarized light transflective film to P-polarized light is less than 10%, and in the wavelength range of 400nm to 600nm, the fluctuation range of the reflectivity of the P-polarized light transflective film to P-polarized light is less than 5%.

[0108] In some embodiments, when the P-polarized light transflective film is within a third incident angle range, the average reflectivity of the first polarized light in the wavelength range of 420nm to 490nm is a first reflectivity, the average reflectivity of the first polarized light in the wavelength range of 500nm to 560nm is a second reflectivity, and the average reflectivity of the first polarized light in the wavelength range of 580nm to 630nm is a third reflectivity; wherein the difference between any two of the first reflectivity, the second reflectivity and the third reflectivity is less than or equal to 10%.

[0109] The third incident angle range is less than or equal to the first incident angle range, and is within the first incident angle range, that is, the third incident angle range is included in the first incident angle range. For example, if the first incident angle range is: 20° to 70°, then the third incident angle range can be 20° to 70°, or 50° to 65°, or 50° to 70°.

[0110] Among them, 420nm to 490nm corresponds to the wavelength range of blue light, 500nm to 560nm corresponds to the wavelength range of green light, and 580nm to 630nm corresponds to the wavelength range of red light. In this way, in different wavelength ranges, the difference in reflectivity of the P-polarized light transflective film to the P-polarized light is small, that is, the difference in reflectivity to light of different colors is small. After the image light is reflected by the P-polarized light transflective film, the color of the image light will not change significantly, which can prevent the color deviation of the image light.

[0111] Exemplarily, when the incident angle of the image light is 50°, the reflectivity of the blue light wavelength range (420nm-490nm) is set to 29%±2%, the reflectivity of the green light wavelength range (500nm-560nm) is set to 29%±2%, and the reflectivity of the red light wavelength range (580nm-630nm) is set to 29%±2%. When the incident angle of the image light is 55°, the reflectivity of the blue light wavelength range (420nm-490nm) is set to 30%±2%, the reflectivity of the green light wavelength range (500nm-560nm) is set to 30%±2%, and the reflectivity of the red light wavelength range (580nm-630nm) is set to 30%±2%. When the incident angle of the image light is 60 degrees, the reflectivity of the blue light wavelength range (420nm-490nm) is set to 34%±2%, the reflectivity of the green light wavelength range (500nm-560nm) is set to 34%±2%, and the reflectivity of the red light wavelength range (580nm-630nm) is set to 34%±2%. When the incident angle of the image light is 65 degrees, the reflectivity of the blue light wavelength range (420nm-490nm) is set to 41%±2%, the reflectivity of the green light wavelength range (500nm-560nm) is set to 41%±2%, and the reflectivity of the red light wavelength range (580nm-630nm) is set to 41%±2%.

[0112] In some embodiments, the refractive index of the first sub-medium layer is greater than or equal to 2.0, and the refractive index of the second sub-medium layer is less than or equal to 1.7.

[0113] The refractive index of the first sub-medium layer is greater than or equal to 2.0, and tantalum pentoxide (Ta2O5), titanium pentoxide (Ti3O5), titanium dioxide (TiO2), niobium pentoxide (Nb2O5) and lanthanum titanate (H 14At least one of La2O7Ti2). Among them, the refractive index of tantalum pentoxide is in the range of 2.05 to 2.25, preferably 2.1; the refractive index of titanium pentoxide is in the range of 2.35±0.5; the refractive index of titanium dioxide is in the range of 2.35±0.5; the refractive index of niobium pentoxide is in the range of 2.35±0.5; and the refractive index of lanthanum titanate is in the range of 2.05±0.5.

[0114] The refractive index of the second sub-medium layer is less than or equal to 1.7, and at least one of silicon dioxide (SiO2), aluminum oxide (Al2O3) and silicon-aluminum mixture can be selected. Among them, the refractive index of silicon dioxide ranges from 1.45 to 1.49, preferably 1.47; the refractive index of aluminum oxide ranges from 1.61 to 1.67, preferably 1.64; the refractive index of silicon-aluminum mixture ranges from 1.3 to 1.7, preferably 1.5.

[0115] In some embodiments, the first sub-dielectric layer includes at least one of a titanium dioxide layer, a titanium pentoxide layer, a tantalum pentoxide layer, a niobium pentoxide layer and a lanthanum titanate layer; and / or the second sub-dielectric layer includes at least one of a silicon dioxide layer, an aluminum oxide layer and a silicon-aluminum mixed layer.

[0116] In some embodiments, the single layer thickness of the first sub-dielectric layer is 10 nm to 100 nm, and / or the single layer thickness of the second sub-dielectric layer is 15 nm to 150 nm.

[0117] In which, in combination with Figures 7-10, the thickness of the first sub-dielectric layer 111 is the distribution length of the first sub-dielectric layer 111 in the stacking direction X, which ranges from 10nm to 100nm; the thickness of the second sub-dielectric layer 112 is the distribution length of the second sub-dielectric layer 112 in the stacking direction X, which ranges from 15nm to 150nm.

[0118] It should be noted that the transflective film 1 in the embodiment of the present disclosure is a multi-layer structure, and the thicknesses of the multiple first sub-dielectric layers 111 are not equal, and their thicknesses are all within the range of 10nm to 100nm; similarly, the thicknesses of the multiple second sub-dielectric layers 112 are not equal, and their thicknesses are all within the range of 15nm to 150nm; the embodiment of the present disclosure does not limit the size relationship between the thickness of the first sub-dielectric layer 111 and the thickness of the second sub-dielectric layer 112. For example, Figure 1-4 As shown, the thicknesses of the plurality of first sub-dielectric layers 111 vary and are not equal, and the thicknesses of the plurality of second sub-dielectric layers 112 are also the same.

[0119] In some embodiments, the minimum single layer thickness in the first sub-dielectric layer 111 is smaller than the minimum single layer thickness in the second sub-dielectric layer 112 , and the maximum single layer thickness in the first sub-dielectric layer 111 is smaller than the maximum single layer thickness in the second sub-dielectric layer 112 .

[0120] Exemplarily, the transflective film 1 includes multiple film layers, wherein the thickness of the first sub-medium layer 111 with the smallest single layer thickness is H 1_min The thickness of the second sub-medium layer 112 with the smallest single layer thickness is H 2_min , H 1_min <H 2_min The thickness of the first sub-medium layer 111 with the largest single layer thickness is H 1_max The thickness of the second sub-medium layer 112 with the largest single layer thickness is H 2_max , H 1_max <H 2_max .

[0121] In some embodiments, Figure 7 and 9 As shown, along the stacking direction X, the two sub-dielectric layers in contact with the metal layer 12 are both the first sub-dielectric layers 111 .

[0122] In some embodiments, Fig.10 As shown, along the stacking direction X, the two sub-dielectric layers in contact with the metal layer 12 are both the second sub-dielectric layers 112 .

[0123] In some embodiments, Figure 8 As shown, along the stacking direction X, there are two sub-dielectric layers in contact with the metal layer 12 , one of which is a first sub-dielectric layer 111 , and the other is a second sub-dielectric layer 112 .

[0124] In some embodiments, Figure 7-10 As shown, along the stacking direction X, the difference in single-layer thickness between the two sub-dielectric layers in contact with the metal layer 12 is less than or equal to 50 nm.

[0125] The single-layer thicknesses of the two sub-dielectric layers in contact with the metal layer 12 are not equal, and the difference between the two is less than or equal to 50 nm.

[0126] For example, Fig.10 As shown, in the transflective film 1, the two sub-dielectric layers in contact with the metal layer 12 are both second sub-dielectric layers 112, the single-layer thickness of the second sub-dielectric layer 112 located above the metal layer 12 is greater than the single-layer thickness of the second sub-dielectric layer 112 located below the metal layer 12, and the difference in thickness between the two is less than or equal to 50 nm.

[0127] For example, Figure 8 As shown, in the transflective film 1, the sub-dielectric layer located above the metal layer 12 and in contact with it is the first sub-dielectric layer 111, and the sub-dielectric layer located below the metal layer 12 and in contact with it is the second sub-dielectric layer 112, the single layer thickness of the first sub-dielectric layer 111 is greater than the single layer thickness of the second sub-dielectric layer 112, and the difference in thickness between the two is less than or equal to 50nm.

[0128] For example, Figure 7 and 9 As shown, in the transflective film 1, the two sub-dielectric layers in contact with the metal layer 12 are both the first sub-dielectric layer 111, the single-layer thickness of the first sub-dielectric layer 111 located above the metal layer 12 is greater than the single-layer thickness of the first sub-dielectric layer 111 located below the metal layer 12, and the difference in thickness between the two is less than or equal to 50nm.

[0129] It should be noted that Figure 7-10 It is only exemplarily shown that the single-layer thickness of the sub-dielectric layer located above the metal layer 12 is greater than the single-layer thickness of the sub-dielectric layer located below the metal layer 12, but it does not constitute a limitation on the transflective film provided in the embodiment of the present disclosure. In other embodiments, the single-layer thickness of the sub-dielectric layer located above the metal layer 12 can also be set to be less than the single-layer thickness of the sub-dielectric layer located below the metal layer 12, which is not limited here.

[0130] In some embodiments, within a single dielectric layer, the number of first sub-dielectric layers is less than or equal to 10, and the number of second sub-dielectric layers is less than or equal to 10.

[0131] In this embodiment, the number of layers of the first sub-dielectric layer 111 and the number of layers of the second sub-dielectric layer 112 may be equal or different, but the number of layers of both is less than or equal to 10. In this way, the P-polarized light transflective film 1 has a structure with fewer film layers, and can still adjust the reflectivity of P-polarized light and S-polarized light to obtain a higher reflectivity of P-polarized light and a lower reflectivity of S-polarized light, which not only simplifies the film layer structure and reduces the film layer thickness, but also helps to reduce costs.

[0132] Furthermore, if Figure 7-10 As shown, in a single dielectric layer, the number of first sub-dielectric layers 111 is less than or equal to 5, and the number of second sub-dielectric layers 112 is less than or equal to 5.

[0133] For example, Figure 7-9 As shown, the P-polarized light transflective film 1 includes a metal layer 12 and two dielectric layers 11; along the stacking direction X of the metal layer 12 and the dielectric layer 11, the metal layer 12 is located between the two dielectric layers 11. The dielectric layer 11 located above the metal layer 12 includes a first sub-dielectric layer 111 and a second sub-dielectric layer 112 that are alternately stacked. In the dielectric layer 11, the number of layers of the first sub-dielectric layer 111 is 5, and the number of layers of the second sub-dielectric layer 112 is 4, and the number of layers of both is less than or equal to 10.

[0134] For example, Fig.10As shown, the P-polarized light transflective film 1 includes a metal layer 12 and two dielectric layers 11; along the stacking direction X of the metal layer 12 and the dielectric layer 11, the metal layer 12 is located between the two dielectric layers 11. The dielectric layer 11 located above the metal layer 12 includes a first sub-dielectric layer 111 and a second sub-dielectric layer 112 that are alternately stacked. In the dielectric layer 11, the number of layers of the first sub-dielectric layer 111 is 4, and the number of layers of the second sub-dielectric layer 112 is 5, and the number of layers of both is less than or equal to 10.

[0135] In some embodiments, the metal layer includes at least one of a silver reflective layer, a gold reflective layer, a copper reflective layer, and an aluminum reflective layer.

[0136] The material of the metal layer can be at least one of gold, silver, copper and aluminum, preferably silver. In other embodiments, the metal layer can also be made of other metal materials known to those skilled in the art, such as titanium or nickel, which are not limited here.

[0137] In some embodiments, the single layer thickness of the metal layer is 1 nm to 50 nm.

[0138] After further optimization, the single layer thickness of the metal layer is 15nm to 30nm.

[0139] In some embodiments, Figure 11-12 As shown, the P-polarized light transflective film 1 further includes a support layer 13 ; along the stacking direction X, the support layer 13 is located on at least one side of the metal layer 12 , and the support layer 13 is in contact with the metal layer 12 .

[0140] The support layer 13 is used to improve the adhesion of the metal layer 12 , so as to improve the internal bonding force and structural strength of the transflective film and prevent cracking between the metal layer 12 and the dielectric layer 11 .

[0141] For example, Fig.11 As shown, along the stacking direction X, the support layer 13 is only arranged below the metal layer 12 .

[0142] For example, Fig.12 As shown, along the stacking direction X, the support layer 13 is arranged above and below the metal layer 12 at the same time.

[0143] In some embodiments, the support layer includes an aluminum oxide layer; and / or a single layer thickness of the support layer is 10 nm to 100 nm.

[0144] After further optimization, the single layer thickness of the support layer is 20nm to 50nm.

[0145] In some embodiments, the total number of layers of the transflective film is less than or equal to 30, and / or the overall thickness of the transflective film is 100 nm to 800 nm.

[0146] The total number of layers of the transflective film is the sum of the number of layers of all the film layers in the transflective film, that is, the total number of layers of the transflective film is equal to the sum of the number of layers of the first sub-dielectric layer, the number of layers of the second sub-dielectric layer, the number of layers of the metal layer and the number of layers of the support layer.

[0147] According to further optimization, the total number of layers of the transflective film is less than or equal to 15, and / or the overall thickness of the transflective film is 300 nm to 500 nm.

[0148] In some embodiments, the transflective film is an optical coating.

[0149] Among them, optical coating refers to forming all the film layer structures of any of the above-mentioned transflective films one by one on an optical element or an independent substrate to change the transmission characteristics of light, including but not limited to the transmission, reflection, absorption, scattering, polarization and phase change of light; by designing the film layer composition of the transflective film and the thickness and number of each film layer, the transflective film can selectively transmit light with the first characteristic and selectively reflect or absorb light with the second characteristic.

[0150] For example, the head-up display system further includes an amplifying component, which includes, for example, a curved reflector, or includes a curved reflector and a flat reflector. The amplifying component is used to reflect the image light emitted by the image generating unit 3 to the transflective imaging unit 2 to amplify the image displayed in the image generating unit 3 into a virtual image, wherein the image light is emitted through the exit port of the head-up display system.

[0151] For example, the transflective imaging unit 2 may be a windshield of a vehicle, and the eye box area may be an area where the observer needs to view the imaging according to actual needs, namely, the eye box area (eyebox). The eye box area refers to the area where the observer's eyes are located and where the image displayed by the display system can be seen, for example, it may be a plane area or a three-dimensional area.

[0152] On the basis of the above-mentioned implementation manner, the embodiment of the present disclosure further provides a means of transportation, including: any one of the above-mentioned head-up display systems, which has corresponding beneficial effects, and will not be described again here to avoid repeated description.

[0153] The transportation means include but are not limited to vehicles, and also include all transportation means known to those skilled in the art, such as ships, airplanes or spacecraft, etc., which are not limited here.

[0154] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0155] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A head-up display system, characterized in that: include: An image generating unit; the image generating unit comprises a display panel and a backlight source, the display panel comprises at least two display areas, the backlight source comprises at least two light-emitting modules, the display areas correspond to the light-emitting modules one by one; the backlight source is configured to determine the target brightness of the corresponding light-emitting module according to the brightness information of each display area of ​​the display panel; The display panel emits at least P polarized light; A transflective imaging unit; the transflective imaging unit includes a P-polarized light transflective film, which is used to reflect the P-polarized light emitted by the display panel to the eye box area to form a virtual image; wherein the reflectivity of the P-polarized light transflective film to P-polarized light is greater than the reflectivity to S-polarized light.

2. The head-up display system according to claim 1, characterized in that: The P polarized light transflective film comprises: A dielectric layer and a metal layer, wherein the dielectric layer and the metal layer are stacked; along the stacking direction, the dielectric layer is located on both sides of the metal layer; At least one of the dielectric layers includes a first sub-dielectric layer and a second sub-dielectric layer alternately stacked along the stacking direction, and the refractive index of the first sub-dielectric layer is greater than the refractive index of the second sub-dielectric layer.

3. The head-up display system according to claim 2, characterized in that: The refractive index of the first sub-medium layer is greater than or equal to 2.0, and the refractive index of the second sub-medium layer is less than or equal to 1.

7.

4. The head-up display system according to claim 3, characterized in that: The first sub-dielectric layer includes at least one of a titanium dioxide layer, a titanium pentoxide layer, a tantalum pentoxide layer, a niobium pentoxide layer and a lanthanum titanate layer; and / or, The second sub-dielectric layer includes at least one of a silicon dioxide layer, an aluminum oxide layer and a silicon-aluminum mixed layer.

5. The head-up display system according to claim 2, characterized in that: The single layer thickness of the first sub-dielectric layer is 10 nm to 100 nm, and / or the single layer thickness of the second sub-dielectric layer is 15 nm to 150 nm.

6. The head-up display system according to claim 2, characterized in that: Along the stacking direction, the two sub-dielectric layers in contact with the metal layer are both first sub-dielectric layers, or both are second sub-dielectric layers, or one is the first sub-dielectric layer and the other is the second sub-dielectric layer; and / or, In a single dielectric layer, the number of the first sub-dielectric layers is less than or equal to 10, and the number of the second sub-dielectric layers is less than or equal to 10.

7. The head-up display system according to claim 2, characterized in that: The metal layer includes at least one of a silver reflective layer, a gold reflective layer, a copper reflective layer and an aluminum reflective layer; and / or, The single layer thickness of the metal layer is 1 nm to 50 nm.

8. The head-up display system according to claim 2, characterized in that: The P-polarized light transflective film further includes a support layer; Along the stacking direction, the support layer is located on at least one side of the metal layer, and the support layer is in contact with the metal layer.

9. The head-up display system according to any one of claims 2 to 8, characterized in that: The total number of layers of the P-polarized light transflective film is less than or equal to 30, and / or the overall thickness of the P-polarized light transflective film is 100 nm to 800 nm.

10. The head-up display system according to claim 1, characterized in that: When the incident angle of the P-polarized light is 20° to 70°, the reflectivity of the P-polarized light transflective film to the P-polarized light is greater than or equal to 20%.

11. The head-up display system according to claim 1, characterized in that: The head-up display system further includes: a control module; the control module is specifically used for: Determining a pixel group corresponding to each of the display areas according to an image to be displayed on the display panel; The brightness information of each of the display areas is determined according to the pixel value of the pixel group corresponding to each of the display areas.

12. The head-up display system according to claim 11, characterized in that: The control module is specifically used to determine the brightness information of each display area according to the pixel value of the pixel group corresponding to each display area, including: Determine the brightness value of each pixel according to the pixel value of each pixel in the pixel group corresponding to each display area; A weighted average of the brightness values ​​of all the pixels in the pixel group is calculated to obtain brightness information corresponding to each of the display areas.

13. The head-up display system according to claim 11, characterized in that: The control module is specifically used to determine the brightness information of each display area according to the pixel value of the pixel group corresponding to each display area, including: Determine the brightness value of each pixel according to the pixel value of each pixel in the pixel group corresponding to each display area; Comparing the brightness value of each pixel with a preset threshold value to obtain a comparison result of each display area; The brightness information of each display area is determined according to the comparison result of each display area.

14. The head-up display system according to claim 11, characterized in that: The control module is also used for: Determine the brightness adjustment value corresponding to each of the light-emitting modules according to the external environment brightness; Each of the light-emitting modules is controlled based on the target brightness and the brightness adjustment value corresponding to each of the light-emitting modules.

15. The head-up display system according to claim 14, characterized in that: Each of the light-emitting modules includes at least one light-emitting element, and the control module controls each of the light-emitting elements; and / or, Each of the light-emitting modules emits polarized light that matches the P-polarized light transflective film.

16. A means of transport, characterized in that: include: A head-up display system as claimed in any one of claims 1 to 15.

Images