Head-up display system and vehicle

Abstract

The invention provides a head-up display system and a vehicle, and relates to the technical field of display. The image generation device emits image light, and the image light is reflected to the projection surface through the reflection assembly; the wavelength selection reflecting film is located on the reflecting surface of the reflecting assembly, realizes the function of selective reflection of different wavebands, is set to reflect at least part of image light, and ensures that the image light is not influenced by the arrangement of the wavelength selection reflecting film; when external interference light enters the head-up display system along a backlight path of image light, the external interference light enters the wavelength selection reflecting film before entering the image generation device, and the wavelength selection reflecting film only reflects the interference light with the same wave band as the image light. Therefore, most of the interference light with the wave band different from that of the image light is absorbed and filtered out, the interference light cannot enter the image generating device, the influence of the backward flowing problem of the external interference light on the image generating device is remarkably reduced, the service life of the image generating device is prolonged, and the imaging quality of the image generating device is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and particularly to a head-up display system and a vehicle. Background Art

[0002] With the continuous development of science and technology, various display technologies have been widely applied in different fields. Nowadays, to improve driving safety, a head-up display system is provided on the front windshield of some vehicles. The head-up display (English full name: Head Up Display, abbreviated as HUD) system refers to projecting important driving information such as speed and navigation onto the front windshield in front of the driver, enabling the driver to see important driving information such as speed and navigation without having to lower or turn their head, and without having to take their eyes off the front of the driving area, thus improving driving safety.

[0003] Due to the principle of reversibility of light paths, the problem of backflow of external interference light such as sunlight will affect the working performance of the image generating device in the head-up display system. For example, it may cause the temperature of the image generating device to rise, thereby affecting the service life and imaging quality of the image generating device. Summary of the Invention

[0004] In view of the above problems, this application provides a head-up display system and a vehicle, which significantly reduce the influence of the backflow problem of external interference light such as sunlight on the image generating device. The specific solutions are as follows:

[0005] This application provides a head-up display system, including: an image generating device, a reflection component, and a wavelength-selective reflection film located on the reflection surface of the reflection component;

[0006] The image light emitted by the image generating device is reflected by the reflection component onto the projection surface;

[0007] The wavelength-selective reflection film reflects at least part of the image light.

[0008] Based on the same inventive concept, this application also provides a vehicle including the above head-up display system.

[0009] With the above technical solutions, the present application provides a head-up display system and a vehicle. An image generating device emits image light, and the image light is reflected by a reflection component onto a projection surface; a wavelength selective reflection film is located on the reflection surface of the reflection component to achieve the function of selective reflection of different wavelength bands. It is set to reflect at least part of the image light to ensure that the image light is not affected by the setting of the wavelength selective reflection film; when external interference light is incident on the head-up display system along the reverse optical path of the image light, since the wavelength selective reflection film is located on the reflection surface of the reflection component, the external interference light will first be incident on the wavelength selective reflection film before being incident on the image generating device. The wavelength selective reflection film only reflects the interference light with the same wavelength band as the image light, thereby absorbing and filtering out most of the interference light with different wavelength bands from the image light, making it impossible to be incident on the image generating device, significantly reducing the impact of the backflow problem of external interference light on the image generating device, and improving the service life and imaging quality of the image generating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In combination with the accompanying drawings and with reference to the following specific embodiments, the above and other features, advantages and aspects of the various embodiments of the present disclosure will become more apparent. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic and the original components and elements are not necessarily drawn to scale.

[0011] Figure 1 It is a schematic diagram of the principle structure of a head-up display system provided by an embodiment of the present invention;

[0012] Figure 2 It is a schematic diagram of the principle structure of another head-up display system provided by an embodiment of the present invention;

[0013] Figure 3 It is a schematic diagram of the internal structure of a wavelength selective reflection film provided by an embodiment of the present invention;

[0014] Figure 4 It is a schematic diagram of the principle structure of yet another head-up display system provided by an embodiment of the present invention;

[0015] Figure 5 It is a schematic diagram of the principle structure of yet another head-up display system provided by an embodiment of the present invention;

[0016] Figure 6 It is a schematic diagram of the partition of a wavelength selective reflection film provided by an embodiment of the present invention;

[0017] Figure 7 It is a schematic diagram of the internal structure of another wavelength selective reflection film provided by an embodiment of the present invention;

[0018] Figure 8 It is a schematic diagram of the principle of partitioned reflection of a wavelength selective reflection film provided by an embodiment of the present invention;

[0019] Figure 9 Schematic diagram of the principle of zonal reflection of another wavelength-selective reflection film provided by an embodiment of the present invention;

[0020] Figure 10 Schematic diagram of the principle of zonal reflection of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0021] Figure 11 Schematic diagram of the zonal division of another wavelength-selective reflection film provided by an embodiment of the present invention;

[0022] Figure 12 Schematic diagram of the zonal division of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0023] Figure 13 Schematic diagram of the zonal division of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0024] Figure 14 Schematic diagram of the zonal division of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0025] Figure 15 Schematic diagram of the zonal division of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0026] Figure 16 Schematic diagram of the zonal division of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0027] Figure 17 Schematic diagram of the zonal division of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0028] Figure 18 Schematic diagram of the zonal division of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0029] Figure 19 Schematic diagram of the zonal division of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0030] Figure 20 Schematic diagram of the zonal division of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0031] Figure 21 Schematic diagram of the zonal division of yet another wavelength-selective reflection film provided by an embodiment of the present invention;

[0032] Figure 22 Schematic diagram of a vehicle equipped with a head-up display system provided by an embodiment of the present invention. Detailed implementation manners

[0033] The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. The terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, rather than to limit the present application. As is known to those of ordinary skill in the art, with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0034] Based on the content recorded in the background art, it is found in the process of the invention of the present application that due to the reversibility of the optical path of the head-up display system, external interference light such as sunlight will be incident on the image generating device due to backflow. Since external interference light such as sunlight has strong energy, this energy will cause the temperature of the image generating device to rise, thereby affecting the working performance of the image generating device. Even more seriously, it may damage the components inside the image generating device.

[0035] Generally speaking, the problem of backflow of external interference light such as sunlight will affect the working performance of the image generating device in the head-up display system. For example, it will cause the temperature of the image generating device to rise, thereby affecting the service life and imaging quality of the image generating device.

[0036] Based on this, the present application provides a head-up display system and a vehicle, which can significantly reduce the influence of the backflow problem of external interference light on the image generating device, and improve the service life and imaging quality of the image generating device.

[0037] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] It should be noted that the orientation terms in the present invention are based on the relative positional relationship shown in the accompanying drawings and cannot be used as an absolute limitation to the present application.

[0039] Refer to Figure 1 , Figure 1 which is a schematic diagram of the principle structure of a head-up display system provided by an embodiment of the present invention; refer to Figure 2 , Figure 2 which is a schematic diagram of the principle structure of another head-up display system provided by an embodiment of the present invention. The head-up display system 100 provided by the embodiment of the present invention includes: an image generating device 11, a reflection component 12, and a wavelength-selective reflection film 13 located on the reflection surface of the reflection component 12.

[0040] The image light emitted by the image generating device 11 is reflected by the reflection component 12 onto the projection surface 14.

[0041] The wavelength-selective reflection film 13 reflects at least part of the image light.

[0042] Specifically, in the embodiment of the present invention, such asFigure 1 As shown, the image generating device 11 emits image light, and the image light is reflected by the reflection component 12 onto the projection surface 14; the wavelength selective reflection film 13 is located on the reflection surface of the reflection component 12 to achieve the function of selective reflection of different wavelength bands, and it is set to reflect at least part of the image light to ensure that the image light will not be affected by the setting of the wavelength selective reflection film 13.

[0043] As Figure 2 shown, when the external interference light is incident on the head-up display system 100 along the reverse optical path of the image light, since the wavelength selective reflection film 13 is located on the reflection surface of the reflection component 12, the external interference light will first be incident on the wavelength selective reflection film 13 before being incident on the image generating device 11. The wavelength selective reflection film 13 only reflects the interference light with the same wavelength band as the image light, thereby absorbing and filtering out most of the interference light with different wavelength bands from the image light, making it impossible to be incident on the image generating device 11, significantly reducing the impact of the backflow problem of the external interference light on the image generating device 11, and improving the service life and imaging quality of the image generating device 11.

[0044] It should be noted that Figure 2 in the figure, the propagation direction of the external interference light with stronger energy is represented by a "thicker" arrow, and the propagation direction of the external interference light with weaker energy is represented by a "thinner" arrow. It can be seen that after the external interference light with stronger energy is incident on the wavelength selective reflection film 13, most of the interference light with different wavelength bands from the image light will be absorbed and filtered out by the wavelength selective reflection film 13, making it impossible to be incident on the image generating device 11. At this time, only a part of the external interference light with weaker energy will be incident on the image generating device 11. Obviously, by setting the wavelength selective reflection film 13 on the reflection component 12, the impact of the backflow problem of the external interference light on the image generating device 11 can be significantly reduced, that is, the temperature rise and imaging impact caused by the backflow of the external interference light are significantly reduced, thereby improving the service life and imaging quality of the image generating device 11.

[0045] Generally speaking, most of the external interference light is difficult to be reflected by the wavelength selective reflection film 13, but is absorbed and filtered out by it, and thus cannot propagate to the image generating device 11 in the subsequent optical path. It not only ensures that the head-up display system 100 can project image light normally, but also reduces the amount of incident external interference light entering the image generating device 11, reduces the heat inside the image generating device 11, and increases the safety.

[0046] Exemplarily, the external interfering light includes but is not limited to ultraviolet light and infrared light. Ultraviolet light may accelerate the aging of components and the degradation of performance within the image generating device 11, affecting the service life of the head-up display system 100. The power of infrared light is very high. When it propagates to the image generating device 11, it will bring a large amount of heat to the image generating device 11, resulting in damage to the image generating device 11. In an embodiment of the present invention, the wavelength selective reflection film 13 can filter at least infrared light and ultraviolet light. In other words, the wavelength selective reflection film 13 can filter infrared light with a wavelength of 730 nm - 2500 nm and ultraviolet light with a wavelength of 10 nm - 400 nm. At the same time, since the wavelength band of the image light does not overlap with the wavelength bands of the infrared light and the ultraviolet light. For example, the wavelength band of red light is approximately 600 nm - 700 nm, the wavelength band of green light is approximately 492 nm - 577 nm, and the wavelength band of blue light is approximately 400 nm - 500 nm, which do not overlap with the wavelength bands of the infrared light and the ultraviolet light. Therefore, it can be seen that the wavelength selective reflection film 13 that filters infrared light and ultraviolet light will not affect the image light, thereby ensuring the normal display of the head-up display system 100.

[0047] Exemplarily, the wavelength selective reflection film 13 can reflect only light with a wavelength in the range of 400 nm - 700 nm, and absorb and filter light with wavelengths outside the range of 400 nm - 700 nm. In other words, through the wavelength selective reflection characteristic of the wavelength selective reflection film 13, the external interfering light outside a specific wavelength range is blocked from entering the image generating device 11.

[0048] Among them, the image generating device 11 is used to modulate and emit image light. The image generating device 11 includes but is not limited to an image generation unit (Picture Generation Unit, PGU), etc. The image generating device 11 can obtain vehicle information through vehicle sensors, wireless devices, etc., and modulate it to form image light for emission. The image generating device 11 has a light emitting surface, and the number of light emitting surfaces can be one or more. The image light can be emitted from a single light emitting surface or from multiple light emitting surfaces simultaneously. The image generating device 11 can project information such as images or texts onto the projection surface 14 in a visible or invisible form by controlling the light intensity, color, and direction of the image light. This projection is usually achieved by encoding information such as images or texts into a series of sub-pixels, and then controlling the light intensity and color of each sub-pixel.

[0049] Exemplarily, the display unit in the image generating device 11 includes, but is not limited to, a liquid crystal display unit, an OLED (English full name: Organic Light Emitting Diode, Chinese name: Organic Light Emitting Diode) display unit, or a Micro-LED (English full name: Micro-Light Emitting Diode, Chinese name: Micro-Light Emitting Diode) display unit.

[0050] In an alternative embodiment of the present invention, refer to Figure 3 , Figure 3 which is a schematic internal structure diagram of a wavelength selective reflection film provided by an embodiment of the present invention. The wavelength selective reflection film 13 is a photonic crystal reflection film 15; the photonic crystal reflection film 15 includes microsphere particles 151.

[0051] Among them, the diameter and / or volume fraction of the microsphere particles 151 are determined based on the wavelength band that the wavelength selective reflection film 13 needs to selectively reflect.

[0052] Exemplarily, if the wavelength selective reflection film 13 only reflects light with wavelengths in the range of 400 nm - 700 nm, then the diameter and / or volume fraction of the microsphere particles 151 are determined based on this wavelength band of 400 nm - 700 nm.

[0053] Specifically, in the embodiment of the present invention, a photonic crystal is an artificial periodic dielectric structure with photonic bandgap characteristics, which can prevent waves in a certain frequency range from propagating in this periodic structure, that is, this structure itself has a "forbidden band".

[0054] Among them, D is the diameter of the microsphere particles 151, n eff is the equivalent refractive index, n s is the refractive index of the microsphere particles 151, f s is the volume fraction of the microsphere particles 151, and there is a relationship of n eff 2 = n s 2 f s + n air 2 (1 - f s ). Combining with the Bragg equation nλ = 2dsinθ (d is the crystal plane spacing, n is the reciprocal of the average refractive index, θ is the Bragg diffraction angle), based on face-centered cubic, d = 0.816D, the relationship between the wavelength λ and the diameter D of the microsphere particles 151 can be obtained as λ = 1.63 * D * sinθ / n eff .

[0055] It can be seen from this that when the photonic crystal reflection film 15 is used as the wavelength-selective reflection film 13, by adjusting the diameter and / or volume fraction of the microsphere particles 151, selective reflection in different wavelength bands can be achieved. While not affecting the reflection imaging of the image light emitted by the image generating device 11, most of the external ambient light incident on the image generating device 11 can also be blocked.

[0056] Optionally, the material of the microsphere particles 151 includes but is not limited to SiO2 material, PMMA (English full name: Polymeric MethylMethacrylate, Chinese name: polymethyl methacrylate) material, or PS (English full name: Polystyrene, Chinese name: polystyrene) material, etc.

[0057] In an alternative embodiment of the present invention, as Figure 1 and Figure 2 shown, the reflection assembly 12 includes a first reflector 121 and a second reflector 122 sequentially arranged on the transmission optical path of the image light.

[0058] Specifically, in the embodiment of the present invention, the first reflector 121 is used to receive and reflect the image light, and the second reflector 122 is used to receive the image light reflected by the first reflector 121 and reflect it to the projection surface 14. Among them, the first reflector 121 and the second reflector 122 can be plane reflectors, convex reflectors, concave reflectors, etc., which can be limited according to specific implementation requirements and are not limited in the embodiment of the present invention.

[0059] Exemplarily, as Figure 1 and Figure 2 shown, the first reflector 121 is described by taking a plane reflector as an example, and the second reflector 122 is described by taking a concave mirror as an example. The first reflector 121 changes the propagation path of the image light, so that the light beam of the image light is reflected and propagated to the reflection surface of the second reflector 122; the second reflector 122 can focus the light beam of the image light and change the propagation path of the image light, so that the light beam of the image light is reflected and propagated to the projection surface 14.

[0060] It should be noted that the types, positions, and angles of the first reflector 121 and the second reflector 122 can be flexibly adjusted according to implementation requirements to achieve the best image projection effect and the preset propagation path.

[0061] In an alternative embodiment of the present invention, referring to Figure 4 , Figure 4 is a schematic diagram of the principle structure of another head-up display system provided by the embodiment of the present invention; referring to Figure 5 , Figure 5Schematic diagram of the principle structure of another head-up display system provided by an embodiment of the present invention. In the embodiment of the present invention, the wavelength-selective reflection film 13 is located on the reflecting surface of the first mirror 121, and / or the wavelength-selective reflection film 13 is located on the reflecting surface of the second mirror 122.

[0062] Specifically, in the embodiment of the present invention, as Figure 1 and Figure 2 shown, the wavelength-selective reflection film 13 is located on the reflecting surface of the first mirror 121, that is, the wavelength-selective reflection film 13 is provided on the reflecting surface of the first mirror 121, while the wavelength-selective reflection film 13 is not provided on the reflecting surface of the second mirror 122; as Figure 4 shown, the wavelength-selective reflection film 13 is located on the reflecting surface of the second mirror 122, that is, the wavelength-selective reflection film 13 is provided on the reflecting surface of the second mirror 122, while the wavelength-selective reflection film 13 is not provided on the reflecting surface of the first mirror 121; as Figure 5 shown, the wavelength-selective reflection film 13 is located on the reflecting surface of the first mirror 121, and the wavelength-selective reflection film 13 is also located on the reflecting surface of the second mirror 122, that is, the wavelength-selective reflection film 13 is provided on the reflecting surface of the first mirror 121, and the wavelength-selective reflection film 13 is also provided on the reflecting surface of the second mirror 122.

[0063] Furthermore, when the wavelength-selective reflection film 13 is provided on the reflecting surface of the second mirror 122, the external interference light preferentially enters the second mirror 122. At this time, the wavelength-selective reflection film 13 on the second mirror 122 can absorb and filter out most of the external interference light, reducing most of the energy of the external interference light, and can reduce the heat dissipation requirement of the subsequent optical path.

[0064] Furthermore, when the wavelength-selective reflection films 13 are simultaneously provided on the reflecting surface of the first mirror 121 and the reflecting surface of the second mirror 122, the selectively reflected bands corresponding to the two wavelength-selective reflection films 13 can be different. For example, the selectively reflected band corresponding to the wavelength-selective reflection film 13 on the first mirror 121 is A1nm - B1nm, and the selectively reflected band corresponding to the wavelength-selective reflection film 13 on the second mirror 122 is A2nm - B2nm, where A1 ≠ A2, and / or B1 ≠ B2. By reasonably designing the values of A1, A2, B1, and B2, while the image light can be normally reflected, the purpose of gradually absorbing and filtering the external interference light can be achieved, so that the energy of the external interference light is gradually reduced, further improving the filtering effect and ensuring the normal use of the head-up display system 100.

[0065] It should be noted that the wavelength selective reflection film 13 can also be arranged by disposing other optical elements in the optical path of the image light, and at least a part of the external interference light propagating along the reverse optical path of the head-up display system 100 can be absorbed and filtered to reduce the energy of the external interference light.

[0066] In an alternative embodiment of the present invention, the display unit in the image generating device 11 includes a plurality of sub-pixels, and the sub-pixels are one or more of red sub-pixels, green sub-pixels, blue sub-pixels, and white sub-pixels.

[0067] Reference Figure 6 , Figure 6 is a schematic diagram of the partition of a wavelength selective reflection film provided by an embodiment of the present invention; the wavelength selective reflection film 13 includes at least one first region 131, and part of the first region 131 reflects the red light emitted by the red sub-pixels, and / or part of the first region 131 reflects the green light emitted by the green sub-pixels, and / or part of the first region 131 reflects the blue light emitted by the blue sub-pixels, and / or part of the first region 131 reflects the white light emitted by the white sub-pixels.

[0068] Specifically, in the embodiment of the present invention, the diameter of the microsphere particles 151 in part of the first region 131 is different from that of the microsphere particles 151 in part of the first region 131, and / or the volume fraction of the microsphere particles 151 in part of the first region 131 is different from that of the microsphere particles 151 in part of the first region 131. That is, by adjusting the diameter and / or volume fraction of the microsphere particles 151, selective reflection of different wavelength bands can be achieved.

[0069] Exemplarily, as Figure 7 shown, Figure 7 is a schematic diagram of the internal structure of another wavelength selective reflection film provided by an embodiment of the present invention. Among them, D1≠D2≠D3 to achieve selective reflection of different wavelength bands in different first regions 131.

[0070] Reference Figure 8 , Figure 8 is a schematic diagram of the principle of partition reflection of a wavelength selective reflection film provided by an embodiment of the present invention. In a possible implementation, taking the display unit in the image generating device 11 including red sub-pixels 111, green sub-pixels 112, and blue sub-pixels 113 as an example, selective reflection of different wavelength bands is achieved by adjusting the diameter and / or volume fraction of the microsphere particles 151, so that part of the first region 131 reflects the red light emitted by the red sub-pixels 111, part of the first region 131 reflects the green light emitted by the green sub-pixels 112, and part of the first region 131 reflects the blue light emitted by the blue sub-pixels 113 to achieve full-color display.

[0071] Exemplarily, the area labeled 131A reflects the red light emitted by the red sub-pixel 111, the area labeled 131B reflects the green light emitted by the green sub-pixel 112, and the area labeled 131C reflects the blue light emitted by the blue sub-pixel 113.

[0072] Reference Figure 9 , Figure 9 FIG. is a schematic diagram of the principle of zonal reflection of another wavelength-selective reflection film provided by an embodiment of the present invention. In one possible implementation, taking the display unit in the image generating device 11 including a red sub-pixel 111, a green sub-pixel 112, a blue sub-pixel 113, and a white sub-pixel 114 as an example, by adjusting the diameter and / or volume fraction of the microsphere particles 151, selective reflection in different wavelength bands is achieved, so that part of the first area 131 reflects the red light emitted by the red sub-pixel 111, part of the first area 131 reflects the green light emitted by the green sub-pixel 112, part of the first area 131 reflects the blue light emitted by the blue sub-pixel 113, and part of the first area 131 reflects the white light emitted by the white sub-pixel 114. On the basis of realizing full-color display, by adding the white sub-pixel 114 to form a four-color sub-pixel design, the consistency of color performance is improved, and at the same time, the light transmittance of the liquid crystal display unit is greatly improved. When displaying a picture with the same brightness, its power consumption is lower; in the case of the same power consumption, the brightness is greatly increased, making the picture level more distinct and the picture more transparent.

[0073] Exemplarily, the area labeled 131A reflects the red light emitted by the red sub-pixel 111, the area labeled 131B reflects the green light emitted by the green sub-pixel 112, the area labeled 131C reflects the blue light emitted by the blue sub-pixel 113, and the area labeled 131D reflects the white light emitted by the white sub-pixel 114.

[0074] In the embodiment of the present invention, when the collimation degree of the backlight of the image generating device 11 is relatively high, the wavelength-selective reflection film 13 can be subjected to zonal reflection to improve the reflection effect on each color light, and thus improve the display effect of the head-up display system 100. For example, part of the first area 131 only reflects red light with a wavelength in the range of 600 nm - 700 nm, and absorbs and filters light with wavelengths outside the range of 600 nm - 700 nm; part of the first area 131 only reflects green light with a wavelength in the range of 492 nm - 577 nm, and absorbs and filters light with wavelengths outside the range of 492 nm - 577 nm; part of the first area 131 only reflects blue light with a wavelength in the range of 400 nm - 500 nm, and absorbs and filters light with wavelengths outside the range of 400 nm - 500 nm.

[0075] Furthermore, compared with the solution where the wavelength-selective reflection film 13 is not partitioned, and the wavelength-selective reflection film 13 only reflects light with wavelengths in the range of 400 nm - 700 nm and absorbs and filters light outside the range of 400 nm - 700 nm, this can also limit the wavelengths selectively reflected by the first region 131 to a narrower range, so as to block more external interfering light from entering the image generating device 11.

[0076] Similarly, for display solutions where the light emitted from sub-pixels such as the red sub-pixel 111, the green sub-pixel 112, and the blue sub-pixel 113 is purer, the wavelength bands corresponding to each color of light will be appropriately narrowed, and the wavelengths selectively reflected by the wavelength-selective reflection film 13 can be limited to a narrower range, such as within a narrow bandgap range, so as to block more external interfering light from entering the image generating device 11.

[0077] It should be noted that when the backlight collimation of the image generating device 11 is low, to avoid problems such as the first region 131 not receiving the corresponding color light, resulting in light loss, the wavelength-selective reflection film 13 can not be partitioned. Exemplarily, the wavelength-selective reflection film 13 can only reflect light with wavelengths in the range of 400 nm - 700 nm and absorb and filter light outside the range of 400 nm - 700 nm, that is, the wavelength-selective reflection film 13 reflects the red light emitted by the red sub-pixel 111, the green light emitted by the green sub-pixel 112, the blue light emitted by the blue sub-pixel 113, etc. In other words, the wavelength-selective reflection film 13 is not partitioned and is designed to be compatible with the spectrum of the display unit in the image generating device 11 as a whole.

[0078] Reference Figure 10 , Figure 10 FIG. is a schematic diagram of the principle of partitioned reflection of another wavelength-selective reflection film provided by an embodiment of the present invention. In a possible implementation, taking the display unit in the image generating device 11 only including white sub-pixels 114 as an example, by adjusting the diameter and / or volume fraction of the microsphere particles 151, selective reflection of different wavelength bands is achieved, so that part of the first region 131 reflects red light, part of the first region 131 reflects green light, and part of the first region 131 reflects blue light to achieve full-color display. Exemplarily, the region labeled 131A reflects red light, the region labeled 131B reflects green light, and the region labeled 131C reflects blue light.

[0079] Specifically, in the field of color display, including traditional liquid crystal displays, organic light-emitting diodes and other display technologies, traditional color film substrates (also known as CF substrates in the field) are used to achieve RGB color display. The traditional color film substrate realizes RGB display by filtering the primary colors of the white light emitted by the white sub-pixels. Therefore, about two-thirds of the light will be absorbed and lost by the color film substrate, resulting in low transmittance and affecting the display effect.

[0080] Based on this, in the embodiments of the present application, the color film substrate required for the display unit in the image generating device 11 can be directly removed. In the case of partitioning the wavelength selective reflection film 13, by adjusting the diameter and / or volume fraction of the microsphere particles 151, selective reflection of different wavelength bands is achieved, so that part of the first region 131 reflects red light, part of the first region 131 reflects green light, and part of the first region 131 reflects blue light to achieve RGB full-color display.

[0081] In other words, when the white light emitted by the white sub-pixel 114 is incident on the region 131A that reflects red light, this region 131A will reflect the red primary color in the white light and filter out other colors of light; similarly, when the white light emitted by the white sub-pixel 114 is incident on the region 131B that reflects green light, this region 131B will reflect the green primary color in the white light and filter out other colors of light; similarly, when the white light emitted by the white sub-pixel 114 is incident on the region 131C that reflects blue light, this region 131C will reflect the blue primary color in the white light and filter out other colors of light; to achieve RGB full-color display.

[0082] Therefore, the image generating device 11 in the head-up display system 100 provided by the embodiments of the present invention does not require a color film substrate, and combines the selective reflection of different regions of the wavelength selective reflection film 13 to achieve full-color display. Furthermore, the technical problems caused by setting a color film substrate are solved, the cost is reduced, the quality of the image light is improved, and thus the display effect of the head-up display system 100 is improved.

[0083] Reference Figure 11 , Figure 11 is a schematic diagram of the partitioning of another wavelength selective reflection film provided by the embodiments of the present invention; reference Figure 12 , Figure 12 is a schematic diagram of the partitioning of yet another wavelength selective reflection film provided by the embodiments of the present invention; reference Figure 13 , Figure 13 is a schematic diagram of the partitioning of yet another wavelength selective reflection film provided by the embodiments of the present invention; reference Figure 14 , Figure 14 is a schematic diagram of the partitioning of yet another wavelength selective reflection film provided by the embodiments of the present invention; reference Figure 15 , Figure 15This is another schematic diagram of the partition of the wavelength-selective reflection film provided by the embodiments of the present invention. Considering that there are various arrangements of sub-pixels in the display unit of the image generating device 11, when partitioning the first region 131 of the wavelength-selective reflection film 13, the corresponding design can be based on the actual arrangement of sub-pixels. In other words, different first regions 131 of the wavelength-selective reflection film 13 can match the distribution of sub-pixels in the display unit of the image generating device 11, and fine-partition reflection can be achieved by adjusting the diameter and / or volume fraction of the microsphere particles 151 in different first regions 131.

[0084] Exemplarily, when the red sub-pixels 111 in the display unit of the image generating device 11 are arranged in a column, as Figure 15 shown, the region 131A that reflects the red light emitted by the red sub-pixels 111 can be designed to be strip-shaped to achieve the reflection of the red light emitted by a column of red sub-pixels 111, thereby simplifying the difficulty of partitioning the first region 131. And as Figures 11 - 14 shown, one first region 131 can correspond to one sub-pixel.

[0085] It should be noted that the partition design of the first region 131 of the wavelength-selective reflection film 13 is based on the actual arrangement of sub-pixels for corresponding design. Therefore, in the embodiments of the present application, the size of different first regions 131 is used to reflect the size of the light-emitting area of the sub-pixels.

[0086] As Figure 11 and Figure 12 shown, the light-emitting areas of multiple sub-pixels are the same.

[0087] As Figure 13 shown, when the sub-pixels include red sub-pixels 111, green sub-pixels 112, and blue sub-pixels 113, the light-emitting area of the red sub-pixels 111 is S1, the light-emitting area of the green sub-pixels 112 is S2, and the light-emitting area of the blue sub-pixels 113 is S3.

[0088] Among them, S1 > S2 > S3.

[0089] Considering that when the display unit in the image generating device 11 is a Micro-LED display unit, the light-emitting brightness of the Micro-LEDs emitting red light is relatively low. Therefore, the light-emitting area of the red sub-pixels 111 can be increased to achieve the purpose of improving the red light brightness, thereby improving the consistency of color performance and finally improving the display effect of the head-up display system 100.

[0090] As Figure 14As shown, when the sub-pixels include a red sub-pixel 111, a green sub-pixel 112, and a blue sub-pixel 113, the light-emitting area of the red sub-pixel 111 is S1, the light-emitting area of the green sub-pixel 112 is S2, and the light-emitting area of the blue sub-pixel 113 is S3.

[0091] Among them, S2 > S1 and S2 > S3.

[0092] Considering that the human eye is more sensitive to green light, by increasing the light-emitting area of the green sub-pixel 112 to achieve the purpose of increasing the green light brightness, the brightness information can be restored more accurately under the condition of limited sub-pixels (the human eye is more sensitive to brightness than chromaticity), thereby improving the image detail performance.

[0093] Obviously, in the scheme without a CF substrate, more of the first regions 131 can selectively reflect green light to achieve the purpose of increasing the green light brightness. Exemplarily, in the scheme without a CF substrate, the number of regions 131B that reflect green light in the wavelength-selective reflection film 13 is greater than the number of regions 131A that reflect red light, and the number of regions 131B that reflect green light is greater than the number of regions 131C that reflect blue light.

[0094] In an alternative embodiment of the present invention, referring to Figure 16 , Figure 16 is a schematic diagram of another partition of the wavelength-selective reflection film provided by the embodiment of the present invention; referring to Figure 17 , Figure 17 is a schematic diagram of another partition of the wavelength-selective reflection film provided by the embodiment of the present invention; referring to Figure 18 , Figure 18 is a schematic diagram of another partition of the wavelength-selective reflection film provided by the embodiment of the present invention; referring to Figure 19 , Figure 19 is a schematic diagram of another partition of the wavelength-selective reflection film provided by the embodiment of the present invention; referring to Figure 20 , Figure 20 is a schematic diagram of another partition of the wavelength-selective reflection film provided by the embodiment of the present invention. The wavelength-selective reflection film 13 provided by the embodiment of the present invention further includes a second region 132. On the plane where the wavelength-selective reflection film 13 is located, there is no overlapping region between the orthographic projection of the second region 132 and the orthographic projection of the first region 131.

[0095] The second region 132 includes a light-absorbing film layer.

[0096] Specifically, in the embodiment of the present invention, the light-absorbing film layer includes, but is not limited to, a BM film layer. The light incident on the second region 132 will be absorbed by the light-absorbing film layer, avoiding the problem of light crosstalk between the light reflected by two adjacent first regions 131, thereby improving the display effect of the head-up display system 100.

[0097] In an alternative embodiment of the present invention, with reference to Figure 21 , Figure 21 FIG. is a schematic diagram of the partition of another wavelength-selective reflection film provided by the embodiment of the present invention. The wavelength-selective reflection film 13 provided by the embodiment of the present invention further includes a second region 132, and a part of the second region 132 is located between two adjacent first regions 131.

[0098] A part of the second region 132 reflects the red light emitted by the red sub-pixel 111 and the green light emitted by the green sub-pixel 112 at the same time, and / or a part of the second region 132 reflects the red light emitted by the red sub-pixel 111 and the blue light emitted by the blue sub-pixel 113 at the same time. A part of the second region 132 reflects the green light emitted by the green sub-pixel 112 and the blue light emitted by the blue sub-pixel 113 at the same time. A part of the second region 132 reflects the white light emitted by the white sub-pixel 114.

[0099] Specifically, in the embodiment of the present invention, the second region 132 between two adjacent first regions 131 can be compatible with the reflection of adjacent colors. Exemplarily, the region labeled 132A reflects the red light emitted by the red sub-pixel 111 and the green light emitted by the green sub-pixel 112 at the same time, the region labeled 132B reflects the green light emitted by the green sub-pixel 112 and the blue light emitted by the blue sub-pixel 113 at the same time, and the region labeled 132C reflects the red light emitted by the red sub-pixel 111 and the blue light emitted by the blue sub-pixel 113 at the same time.

[0100] Through this design, the wavelength-selective reflection film 13 can reflect more light, improve the light extraction rate of each color of light, and thus improve the display effect of the head-up display system 100.

[0101] In an alternative embodiment of the present invention, when the first mirror 121 is located above the light-emitting side of the image generating device 11 and the wavelength-selective reflection film 13 is located on the reflection surface of the first mirror 121,

[0102] At least one first region 131 includes a target region, and a plurality of sub-pixels include target sub-pixels; the color light reflected by the target region is the same as the color light emitted by the target sub-pixel.

[0103] The orthographic projection of the target region in the first direction overlaps with the region where the target sub-pixel is located; the first direction is perpendicular to the plane where the image generating device 11 is located.

[0104] Specifically, in the embodiment of the present invention, when the first mirror 121 is located above the light-emitting side of the image generating device 11 and the wavelength-selective reflection film 13 is located on the reflection surface of the first mirror 121, the correspondence between the first region 131 and the sub-pixels can be designed more simply. It is only necessary to ensure that the orthographic projection of the target region in the first direction overlaps with the region where the target sub-pixel is located, so that the light emitted by the target sub-pixel can be received by the target region for reflection.

[0105] In order to make as much or all of the light emitted by the target sub-pixel be received by the target region, the overlap between the orthographic projection of the target region in the first direction and the region where the target sub-pixel is located can be optimized, for example, the orthographic projection of the target region in the first direction completely covers the region where the target sub-pixel is located.

[0106] It should be noted that when the wavelength-selective reflection film 13 is located on the reflection surface of the second mirror 122, the correspondence between the first region 131 and the sub-pixels in the wavelength-selective reflection film 13 can also be designed based on the propagation of the optical path.

[0107] Based on the above embodiments of the present invention, in another embodiment of the present invention, a vehicle is further provided. Refer to Figure 22 , Figure 22 is a schematic diagram of a vehicle equipped with a head-up display system provided by an embodiment of the present invention. The vehicle 200 includes, but is not limited to, the head-up display system 100 of the above embodiment.

[0108] Specifically, the vehicle 200 may include a head-up display system 100 and a front windshield 16. The head-up display system 100 can obtain relevant parameter information and display it in the form of image light. The relevant parameter information may include the speed, status, navigation information, etc. of the vehicle 200.

[0109] In one implementation, the head-up display system 100 can be disposed on the driver's console of the vehicle 200, and the head-up display system 100 can emit image light toward the front windshield 16, and the image light is projected onto the front windshield 16. The driver can obtain parameter information, navigation information, etc. of the vehicle 200 through the front windshield 16, so as to facilitate subsequent driving and improve driving safety.

[0110] In the embodiment of the present invention, the case where the wavelength-selective reflection film 13 in the head-up display system 100 is located on the reflection surface of the first mirror 121 is taken as an example for description.

[0111] It should be noted that in the embodiment of the present invention, the wavelength selection reflection film 13 in the head-up display system 100 can also be located on the front windshield 16. The external interference light preferentially enters the front windshield 16. At this time, the wavelength selection reflection film 13 on the front windshield 16 can absorb and filter out most of the external interference light, reduce most of the energy of the external interference light, and can reduce the heat dissipation requirement of the subsequent optical path.

[0112] It should be noted that the projection surface 14 in the embodiment of the present application can be the front windshield 16, side windshield, rear windshield, etc. of the vehicle. In the embodiment of the present invention, only the case where the projection surface 14 is the front windshield 16 of the vehicle is taken as an example for illustration.

[0113] The above provides a detailed introduction to a head-up display system and a vehicle provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

[0114] It should be noted that each embodiment in this specification focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0115] It should also 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements inherently includes the elements, or further includes the elements inherent to these process, method, article or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0116] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A head-up display system, characterized in that, The head-up display system includes: an image generation device, a reflection component, and a wavelength-selective reflection film located on the reflection surface of the reflection component; The image light emitted by the image generation device is reflected by the reflection component onto the projection surface; The wavelength-selective reflection film reflects at least part of the image light.

2. The head-up display system according to claim 1, wherein The reflection component includes a first reflector and a second reflector sequentially arranged on the transmission optical path of the image light.

3. The head-up display system according to claim 2, wherein, The first reflector is a plane reflector, and the second reflector is a concave mirror.

4. The head-up display system according to claim 2, wherein The wavelength-selective reflection film is located on the reflection surface of the first reflector, and / or the wavelength-selective reflection film is located on the reflection surface of the second reflector.

5. The head-up display system according to any one of claims 2-4, characterized in that, The display unit in the image generation device includes a plurality of sub-pixels, and the sub-pixels are one or more of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel; The wavelength-selective reflection film includes at least one first region, and part of the first region reflects the red light emitted by the red sub-pixel, and / or part of the first region reflects the green light emitted by the green sub-pixel, and / or part of the first region reflects the blue light emitted by the blue sub-pixel, and / or part of the first region reflects the white light emitted by the white sub-pixel.

6. The head-up display system according to claim 5, wherein, The light-emitting areas of the plurality of sub-pixels are the same.

7. The head-up display system according to claim 5, wherein When the sub-pixels include the red sub-pixel, the green sub-pixel, and the blue sub-pixel, the light-emitting area of the red sub-pixel is S1, the light-emitting area of the green sub-pixel is S2, and the light-emitting area of the blue sub-pixel is S3; Wherein, S1 > S2 > S3.

8. The head-up display system according to claim 5, wherein, When the sub-pixels include the red sub-pixel, the green sub-pixel, and the blue sub-pixel, the light-emitting area of the red sub-pixel is S1, the light-emitting area of the green sub-pixel is S2, and the light-emitting area of the blue sub-pixel is S3; Wherein, S2 > S1, and S2 > S3.

9. The head-up display system according to claim 5, characterized in that, The wavelength-selective reflection film further includes a second region, and on the plane where the wavelength-selective reflection film is located, there is no overlapping region between the orthographic projection of the second region and the orthographic projection of the first region; The second region includes a light-absorbing film layer.

10. The head-up display system according to claim 5, wherein, The wavelength-selective reflection film further includes a second region, and part of the second region is located between two adjacent first regions; Part of the second region simultaneously reflects the red light emitted by the red sub-pixel and the green light emitted by the green sub-pixel, and / or part of the second region simultaneously reflects the red light emitted by the red sub-pixel and the blue light emitted by the blue sub-pixel, part of the second region simultaneously reflects the green light emitted by the green sub-pixel and the blue light emitted by the blue sub-pixel, and part of the second region reflects the white light emitted by the white sub-pixel.

11. The head-up display system according to claim 5, wherein, When the first reflector is above the light-emitting side of the image generation device, and the wavelength-selective reflection film is located on the reflection surface of the first reflector, The at least one first region includes a target region, and the plurality of sub-pixels includes target sub-pixels; the color light reflected by the target region is the same as the color light emitted by the target sub-pixels; The positive projection of the target area in the first direction overlaps with the area where the target sub-pixel is located; the first direction is perpendicular to the plane where the image generating device is located.

12. The head-up display system according to claim 1, wherein The wavelength selective reflection film is a photonic crystal reflection film; The photonic crystal reflection film includes microsphere particles; The diameters of the microsphere particles in part of the first area are different from those of the microsphere particles in part of the first area, and / or the volume fractions of the microsphere particles in part of the first area are different from those of the microsphere particles in part of the first area.

13. The head-up display system according to claim 12, wherein The material of the microsphere particles is SiO2 material, PMMA material or PS material.

14. A vehicle, characterized in that, The vehicle includes the head-up display system according to any one of claims 1-13.

15. The vehicle according to claim 14, characterized in that, The vehicle includes a front windshield; The wavelength selective reflection film in the head-up display system is located on the front windshield.

Images