Head-up display device

Abstract

The utility model discloses a head-up display device, and the device comprises a three-primary-color light source module which is used for emitting three-primary-color light and comprises a plurality of light-emitting chips which are distributed in an array manner, the plurality of light-emitting chips are distributed in an axial symmetry manner in the length direction of a windshield, and the light emitted by the adjacent light-emitting chips is different from the light emitted by the adjacent light-emitting chips; the conical rod is used for collecting the three-primary-color light and emitting the three-primary-color light after dodging the three-primary-color light; the light modulation module is used for modulating the three-primary-color light emitted by the cone rod and emitting image light formed by modulation; and the first optical filter is used for transmitting the image light to the windshield, so that the image light enters human eyes after being reflected by the windshield. Thus, three-primary-color light emitted by the three-primary-color light source module can penetrate through the first light filter as much as possible, the light beam utilization rate of the device is guaranteed, color cast of a display image formed by the device is avoided, the light-emitting chips are distributed in an axial symmetry mode, and the color light emitted by the adjacent light-emitting chips is different. Therefore, the device can form a display image with uniform color.

Description

Technical Field

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

[0002] In the scenario of in-vehicle display, the light beam emitted by the head-up display device enters the human eye after being reflected by the windshield. The head-up display device can be used to display relevant information on the vehicle dashboard. However, in related technologies, the light beam emitted by the backlight source of the head-up display device is greatly lost when transmitted in the optical path, resulting in a low light beam utilization rate of the head-up display device. Utility Model Content

[0003] The present application proposes a head-up display device, comprising: a three-primary color light source module, for emitting three-primary color lights, the three-primary color light source module comprising a plurality of light-emitting chips distributed in an array, wherein the plurality of light-emitting chips comprise a plurality of red light diodes, a plurality of green light diodes and a plurality of blue light diodes, the plurality of red light diodes, the plurality of green light diodes and the plurality of blue light diodes are axially symmetrically distributed in the length direction of the windshield, and the color lights emitted by adjacent light-emitting chips are different from each other; a cone rod, arranged at the light output position of the three-primary color light source module, the cone rod being used to collect the three-primary color lights, and emitting the three-primary color lights after performing uniform light processing; a light modulation module, arranged in the light output direction of the cone rod, the light modulation module being used to modulate the three-primary color lights emitted by the cone rod, and emitting the image light formed by the modulation; a first filter, arranged at the light output position of the light modulation module, the first filter being used to transmit the image light to the windshield, so that the image light enters the human eye after being reflected by the windshield.

[0004] Optionally, the three-primary-color lights emitted by the multiple light-emitting chips are lights with Lambertian distribution; the three-primary-color light source module also includes an optical adhesive layer, which is arranged in the gaps between the multiple light-emitting chips distributed in the array, and the optical adhesive layer is used to reflect the light with Lambertian distribution to the cone rod.

[0005] Optionally, the head-up display device also includes a polarizer and a reflective brightness enhancement film; the polarizer is arranged at the light output of the cone rod, and the polarizer is used to separate the three primary colors of light into a first polarized light and a second polarized light, and the polarization direction of the first polarized light and the polarization direction of the second polarized light are perpendicular to each other; the reflective brightness enhancement film is bonded to the polarizer, and the reflective brightness enhancement film is used to transmit the first polarized light to the light modulation module, so that the light modulation module modulates the first polarized light and outputs it, and reflects the second polarized light to the optical adhesive layer, so that the optical adhesive layer reflects the second polarized light to the cone rod, wherein the polarization direction of a part of the light beam in the second polarized light after reflection matches the polarization direction of the first polarized light.

[0006] Optionally, the head-up display device also includes a light receiving module and a light diffusion module; the light receiving module is arranged at the light output of the cone rod, and the light receiving module is used to collect the three primary colors of light emitted by the cone rod, and collimate the three primary colors of light before emitting; the light diffusion module is arranged between the light receiving module and the reflective brightness enhancement film, and the light diffusion module is used to angle diffuse the three primary colors of light emitted by the light receiving module before emitting.

[0007] Optionally, the light receiving module is a Fresnel lens, a spherical lens, an aspherical lens or a free-form mirror.

[0008] Optionally, the light diffusion module is an elliptical Gaussian scattering sheet or a light diffraction sheet; the light diffusion module is used to perform angular diffusion of the horizontal diffusion angle and the vertical diffusion angle of the three primary colors of light, and the elliptical Gaussian scattering sheet is used to perform angular diffusion of the horizontal diffusion angle and the vertical diffusion angle of the three primary colors of light, wherein the horizontal diffusion angle after angular diffusion is greater than the vertical diffusion angle, the horizontal diffusion angle is the diffusion angle of the three primary colors of light in the length direction of the windshield, and the vertical diffusion angle is the diffusion angle of the three primary colors of light in the height direction of the windshield.

[0009] Optionally, a set angle is formed between the plane where the first filter is located and the plane where the light modulation module is located, and the first filter is also used to reflect other visible light except the three primary colors of light; the head-up display device also includes a light absorber, which is arranged in the light reflection direction of the first filter, and the light absorber is used to absorb the other visible light reflected by the first filter.

[0010] Optionally, the head-up display device also includes a first free-form surface mirror and a second free-form surface mirror; the first free-form surface mirror is arranged in the light emitting direction of the light modulation module, and the second free-form surface mirror is arranged in the light reflecting direction of the first free-form surface mirror, and the first free-form surface mirror is used to reflect the image light emitted by the light modulation module to the second free-form surface mirror, so that the second free-form surface mirror reflects the image light to the windshield.

[0011] Optionally, the head-up display device also includes a second filter, which is arranged in the light reflection direction of the second free-form surface mirror, and the polarization direction of the second filter matches the polarization direction of the image light emitted by the light modulation module; the second filter is used to transmit the image light reflected by the second free-form surface mirror to the windshield, and the second filter is also used to reflect invisible light and polarized light whose polarization direction is perpendicular to the polarization direction of the image light.

[0012] Optionally, the cone rod comprises a light inlet and a light outlet, the size of the light inlet matches the size of the three-primary-color light source module, and the size of the light outlet matches the size of the light modulation module.

[0013] In the present application, a three-primary color light source module for emitting three-primary color light is used as a backlight light source in a head-up display device, so that when a first filter for transmitting three-primary color light is provided in the device, the light beam emitted by the three-primary color light source module can be transmitted as much as possible, and the three-primary color light can be mixed to form white light matching the color coordinates of normal white light, thereby ensuring the light beam utilization rate of the head-up display device while avoiding color deviation of the display image formed by the device. In addition, a plurality of light-emitting chips for emitting different color lights in the three-primary color light source module are axially symmetrically distributed in the length direction of the windshield, and the color lights emitted by adjacent light-emitting chips are different from each other, so that the head-up display device can form a display image with uniform color.

[0014] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic structural diagram of a head-up display device provided in one embodiment of the present application is shown.

[0017] Figure 2 A schematic structural diagram of a three-primary-color light source module provided in an embodiment of the present application is shown.

[0018] Figure 3 Shows this application Figure 2 A schematic diagram of the distribution of multiple light-emitting chips.

[0019] Figure 4 Shows this application Figure 2 Another distribution diagram of multiple light-emitting chips.

[0020] Figure 5 A schematic structural diagram of a head-up display device provided in another embodiment of the present application is shown.

[0021] Figure 6 A schematic structural diagram of a head-up display device provided in yet another embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0023] The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] Please refer to Figure 1 , Figure 1 The structure diagram of the head-up display device 1 provided by an embodiment of the present application is shown below. Figure 1The head-up display device 1 provided in the embodiment of the present application is described in detail. Figure 1 As shown, the head-up display device 1 of the present application includes a three-primary color light source module 10 , a cone rod 20 , a light modulation module 30 and a first filter 40 .

[0026] In this embodiment, the three-primary-color light source module 10 includes a plurality of light-emitting chips distributed in an array, and the plurality of light-emitting chips are used to emit three-primary-color light, wherein the plurality of light-emitting chips include a plurality of red light diodes for emitting red light beams, a plurality of green light diodes for emitting green light beams, and a plurality of blue light diodes for emitting blue light beams.

[0027] Optionally, the light emitting surface of each light emitting chip in the three-primary color light source module 10 includes at least a rectangle or a square, and the plurality of light emitting chips distributed in the array are arranged in a rectangle. The three-primary color light source module 10 has a long side corresponding to the length direction of the windshield and a short side corresponding to the height direction of the windshield, and the long side corresponds to the horizontal viewing direction of the driver, and the short side corresponds to the vertical viewing direction of the driver.

[0028] It should be noted that if the light-emitting chips emitting different colored lights in the three-primary-color light source module 10 are distributed adjacent to each other in the same color and / or are distributed asymmetrically, the three-primary-color lights emitted by multiple light-emitting chips are projected onto the light modulation module 30, and the three-primary-color lights are difficult to mix at the light modulation module 30 to form a lighting light with uniform color, which results in uneven color of the display image finally formed by the head-up display device 1.

[0029] In this embodiment, if Figure 2 As shown, Figure 2 A schematic structural diagram of a three-primary-color light source module 10 provided in an embodiment of the present application is shown.

[0030] Optionally, the multiple light-emitting chips 11 in the three-primary-color light source module 10 are distributed axially symmetrically in the length direction of the windshield, that is, the multiple light-emitting chips 11 are distributed axially symmetrically in the long side direction of the three-primary-color light source module 10, and the color lights emitted by adjacent light-emitting chips 11 in the array-distributed multiple light-emitting chips 11 are different from each other, thereby ensuring that the three-primary-color lights emitted by the multiple light-emitting chips 11 can be mixed at the light modulation module to form illumination light with uniform color, so that the display image finally formed by the head-up display device has uniform color distribution.

[0031] Among them, Figure 3 As shown, Figure 3 Shows this application Figure 2 A distribution diagram of multiple light emitting chips 11; Figure 4 Shows this application Figure 2Another distribution diagram of multiple light-emitting chips 11; that is, the arrangement of the multiple light-emitting chips 11 distributed in the array is various, and the number and size of the red light diodes, green light diodes and blue light diodes can be determined according to the light efficiency of the three primary colors of light required at the light modulation module.

[0032] In this embodiment, a cone rod 20 is provided at the light outlet of the three-primary-color light source module 10, and the cone rod 20 is used to collect the three-primary-color light emitted by the three-primary-color light source module 10, and emit the collected three-primary-color light after homogenization. In addition, the cone rod 20 includes a light inlet and a light outlet, and the size of the light inlet of the cone rod 20 matches the size of the three-primary-color light source module 10. For example, the size of the light inlet can be equal to the size of the three-primary-color light source module 10, and the size of the light inlet can also be slightly larger than the size of the three-primary-color light source module 10, thereby ensuring that the cone rod 20 can fully collect the three-primary-color light emitted by the three-primary-color light source module 10. Among them, the cone rod 20 can be a hollow cone rod 20, the inner wall of the hollow cone rod 20 is coated with a high-reflectivity film layer, or is made of a high-reflectivity metal material; the cone rod 20 can also be a solid cone rod 20, and the solid cone rod 20 is made of a high-light-transmittance material. The solid cone rod 20 realizes efficient collection of the three primary colors of light by total reflection transmission of the three primary colors of light emitted by the three primary colors light source module 10.

[0033] Furthermore, the light modulation module 30 is arranged in the light emitting direction of the cone rod 20. The light modulation module 30 is used to receive the three-primary color light emitted by the cone rod 20 after the light homogenization process, and modulate the received three-primary color light before emitting it. After the light modulation module 30 emits the modulated image light to the windshield, the modulated image light will be reflected by the windshield and enter the human eye. Among them, the size of the light outlet of the cone rod 20 matches the size of the light modulation module 30. For example, the size of the light inlet can be equal to the size of the three-primary color light source module 10, so that the three-primary color light emitted by the cone rod 20 can be projected to the light modulation module 30 as much as possible, thereby ensuring the utilization rate of the light beam at the light modulation module 30.

[0034] Optionally, in the process of the light modulation module 30 emitting modulated image light to the windshield, since the light path is reversible, external ambient light can also enter the head-up display device 1 in the opposite direction of the image light emission direction, for example, the phenomenon of sunlight backflow occurs. When the three-primary-color light source module 10 is used as a backlight source, after the three-primary-color light emitted by the three-primary-color light source module 10 is projected onto the light modulation module 30, coupled with the focused ambient light projected onto the light modulation module 30, the temperature of the light modulation module 30 will increase significantly until it exceeds the normal operating temperature of the light modulation module 30 and causes damage to the light modulation module 30.

[0035] In this embodiment, a first filter 40 is provided at the light outlet of the light modulation module 30. The first filter 40 is used to transmit visible light within the wavelength range of the three primary colors and reflect other visible light outside the wavelength range of the three primary colors, that is, the first filter 40 includes at least RGB filters. Based on this, the first filter 40 can transmit the image light formed by the light modulation module 30 based on the three primary colors to the windshield, so that the modulated image light enters the human eye after being reflected by the windshield, wherein the transmittance curve of the first filter 40 can be set according to the wavelength peak of the three primary colors emitted by the three primary colors light source module 10, so as to ensure that the first filter 40 can transmit as much of the three primary colors as possible, thereby improving the backlight efficiency. In addition, the first filter 40 can also reflect other visible light in the ambient light incident on the head-up display device 1, that is, the first filter 40 light can also block most of the light beams in the sunlight, thereby ensuring that the temperature of the light modulation module 30 can be within the normal working temperature range when it is working, and preventing the light modulation module 30 from being burned.

[0036] Optionally, when a first filter 40 is provided in the head-up display device 1 to prevent sunlight from flowing back, if the backlight source adopts a white light source, when the first filter 40 transmits a light beam within the wavelength range of the three primary colors, since the spectrum of white light is continuous, a small amount of other colored light outside the wavelength range of the three primary colors may be transmitted, resulting in the colored light finally emitted by the device not being pure three primary colors, and the color coordinates of the white light formed by the mixture of multiple colored lights deviate from the normal white light color coordinates. In the present application, the backlight light source adopts a three-primary color light source module 10 for emitting three primary colors, and the three primary colors emitted by the three-primary color light source module 10 can be mixed to form white light that matches the normal white light color coordinates, thereby avoiding color deviation in the display image formed by the device.

[0037] In this embodiment, the head-up display device 1 uses a three-primary color light source module 10 for emitting three-primary color light as a backlight light source, so that when the device is provided with a first filter 40 for transmitting the three-primary color light, the light beam emitted by the three-primary color light source module 10 can be transmitted as much as possible, and the three-primary color light can be mixed to form white light matching the color coordinates of normal white light, thereby ensuring the light beam utilization rate of the head-up display device 1 while avoiding color deviation of the display image formed by the device. In addition, the multiple light-emitting chips for emitting different color lights in the three-primary color light source module 10 are axially symmetrically distributed in the length direction of the windshield, and the color lights emitted by adjacent light-emitting chips are different from each other, and the three-primary color lights can be mixed at the light modulation module 30 to form a uniform color illumination light, thereby ensuring that the head-up display device 1 can finally form a uniform color display image.

[0038] Please refer to Figure 5 , Figure 5 FIG. 2 shows a schematic diagram of the structure of a head-up display device provided by another embodiment of the present application. Figure 5 As shown, the head-up display device of the present application includes a three-primary color light source module 10 , a cone rod 20 , a light modulation module 30 and a first filter 40 .

[0039] In this embodiment, the three-primary-color light source module 10 includes a plurality of light-emitting chips distributed in an array, and the three-primary-color lights emitted by the plurality of light-emitting chips are lights with a Lambertian distribution, that is, each light-emitting chip is an independent Lambertian light source, and each light-emitting chip has the same brightness in all directions when emitting colored light. Compared with a laser light source, the light-emitting chip used in this application can emit a more uniform colored light beam. However, when the light-emitting chip emits light with a Lambertian distribution, there is a situation where part of the colored light emitted by each light-emitting chip cannot be collected by the cone rod 20. In order to ensure the utilization rate of the light beam, as shown in FIG. Figure 2 As shown, the three-primary-color light source module 10 further includes an optical adhesive layer 12 .

[0040] Optionally, the optical adhesive layer 12 is disposed at the gaps between the plurality of light emitting chips 11 distributed in the array, wherein the optical adhesive layer 12 may be prepared and formed of white adhesive with high reflectivity, and the white adhesive may cover the gaps between and around the plurality of light emitting chips 11 to achieve the function of Lambertian reflection. That is, the optical adhesive layer 12 has an ideal diffuse reflection surface, and although the optical adhesive layer 12 itself does not emit light, it can reflect light incident from any direction in all directions according to Lambert's law, so that the brightness of the reflected light is the same in all directions.

[0041] Specifically, the optical adhesive layer 12 is used to reflect the received light with Lambertian distribution emitted by each light-emitting chip 11 to the cone rod, thereby ensuring that most of the three-primary color lights emitted by the multiple light-emitting chips 11 can be collected by the cone rod to enter the light path of the head-up display device for use. In addition, when the optical adhesive layer 12 is arranged in the gaps and around the multiple light-emitting chips 11, the surface of the optical adhesive layer 12 can be in the same plane as the light-emitting surfaces of the multiple light-emitting chips 11, and the surface of the optical adhesive layer 12 can also be slightly higher than the plane where the light-emitting surfaces of the multiple light-emitting chips 11 are located. Since the color lights emitted by adjacent light-emitting chips 11 in the multiple light-emitting chips 11 distributed in the array are different from each other, the optical adhesive layer 12 can also avoid mutual interference between the color lights emitted by adjacent light-emitting chips 11 in the process of reflecting the light with Lambertian distribution emitted by each light-emitting chip 11 to the cone rod, thereby further improving the illumination color uniformity of the three-primary color lights emitted by the multiple light-emitting chips 11.

[0042] In this embodiment, the head-up display device further includes a polarizer 50 and a reflective brightness enhancement film 60, wherein the polarizer 50 and the reflective brightness enhancement film 60 can be arranged in a laminated manner, or the polarizer 50 and the reflective brightness enhancement film 60 can be designed in an integrated manner, which is not limited here. The polarizer 50 is arranged at the light exit of the cone rod 20, and the polarizer 50 is used to polarize the three primary color lights emitted by the cone rod 20, so as to divide the three primary color lights into a first polarized light and a second polarized light, and the polarization direction of the first polarized light is perpendicular to the polarization direction of the second polarized light, that is, the first polarized light has a first polarization direction, the second polarized light has a second polarization direction, and the first polarization direction is perpendicular to the second polarization direction.

[0043] Optionally, the reflective brightness enhancement film 60 can transmit a light beam having a first polarization direction and reflect a light beam having a second polarization direction, wherein the reflective brightness enhancement film 60 at least includes a reflective polarized brightness enhancement film (Dual Brightness Enhancement Film, DBEF). When the reflective brightness enhancement film 60 is combined with the polarizer 50, the three primary color lights emitted by the cone rod 20 can be divided into the first polarization light and the second polarization light, and the first polarization light can be transmitted to the light modulation module 30 so that the light modulation module 30 modulates the first polarization light and then outputs it, and the second polarization light can be reflected to the optical adhesive layer in the three primary color light source module 10. In the process of the optical adhesive layer reflecting the received second polarized light to the cone rod 20, the polarization direction of part of the light beam in the second polarized light changes, that is, the polarization direction of part of the light beam in the second polarized light after reflection matches the polarization direction of the first polarized light, so that after the part of the light beam is collected and emitted by the cone rod 20, it can be transmitted by the reflective brightness enhancement film 60 to the light modulation module 30 for utilization, and the remaining second polarized light is reflected again by the reflective brightness enhancement film 60 to the optical adhesive layer for recycling. Therefore, through the cooperation between the reflective brightness enhancement film 60 and the optical adhesive layer, after the second polarized light is reflected multiple times for recycling, the utilization rate of the light beam is effectively improved, and the illumination color uniformity of the three primary colors at the light modulation module 30 is improved.

[0044] In this embodiment, the light modulation module 30 at least includes a liquid crystal panel and an analyzer, and the liquid crystal panel is a high temperature resistant liquid crystal screen that can withstand a high temperature of more than 100°C, and only the analyzer is attached thereto. The polarization direction of the polarizer 50 is perpendicular to the polarization direction of the analyzer in the light modulation module 30, and the liquid crystal panel is used to adjust the polarization direction of the three primary colors of light with a first polarization direction to form three primary colors of light with a second polarization direction; the analyzer is arranged at the light exit of the liquid crystal panel, and the analyzer can transmit the linear polarized light with a second polarization direction, so that the analyzer can project the three primary colors of light with a second polarization direction emitted by the liquid crystal panel to the windshield of the vehicle, so as to be reflected by the windshield and enter the human eye. In addition, since the liquid crystal panel itself does not emit light, but can only display images after light modulation of the received backlight, when the first filter 40 is used in this application to prevent sunlight from backflowing, the three primary color light source module 10 is used as the backlight light source. The transmittance curve of the first filter 40 can be set according to the wavelength peak of the three primary colors of light emitted by the three primary colors light source module 10, so that the first filter 40 can transmit the three primary colors of light emitted by the three primary colors light source module 10 as much as possible, so that the three primary colors of light finally emitted by the head-up display device have a better color mixing effect, and the head-up display device has a wide color gamut display effect.

[0045] Optionally, the head-up display device further includes a light receiving module 70 and a light diffusion module 80. The light receiving module 70 is disposed at the light exit of the cone rod 20, and is used to collect the three primary colors of light emitted by the cone rod 20, and collimate the three primary colors of light before emitting the light. In the process of collecting and collimating the three primary colors of light emitted by the cone rod 20, the light receiving module 70 can further homogenize the three primary colors of light, thereby improving the illumination uniformity of the light beam. Among them, after the cone rod 20 collects and homogenizes the light beam emitted by the three primary colors of light source module 10, the light receiving module 70 collects and collimates the three primary colors of light emitted by the cone rod 20 again, thereby improving the uniformity of the three primary colors of light in the light path, and further reducing the diffusion angle of the three primary colors of light in the light path. In addition, the light receiving module 70 is a Fresnel lens, a spherical lens, an aspherical lens or a free-form mirror, which is not limited here.

[0046] Furthermore, the light diffusion module 80 is disposed between the light receiving module 70 and the reflective brightness enhancement film 60, and the light diffusion module 80 is used to angularly diffuse the three primary colors of light emitted by the light receiving module 70 before emitting the light, wherein the light diffusion module 80 at least includes an elliptical Gaussian scattering sheet or a light diffraction sheet, such as an optical shaping sheet, which is not limited here. The light diffusion module 80 is specifically used to angularly diffuse the horizontal diffusion angle and the vertical diffusion angle of the three primary colors of light, wherein the horizontal diffusion angle after angular diffusion is greater than the vertical diffusion angle, the horizontal diffusion angle is the diffusion angle of the three primary colors of light in the length direction of the windshield, and the vertical diffusion angle is the diffusion angle of the three primary colors of light in the height direction of the windshield.

[0047] Optionally, the head-up display device finally emits image light carrying image information, and the user can see the image after the user's eyes obtain the image light, wherein the eye box area refers to the position area where the user can receive light and see the image. When the head-up display device projects the image light to the eye box area, the light modulation module 30 does not change the diffusion angle of the light beam in the process of modulating the received three primary color lights to form the image light.

[0048] In the present application, in order to prevent the image light emitted by the head-up display device from having too large a diffusion angle and the image light from exceeding the eye box area, thereby wasting light energy, the light diffusion module 80 is used to angularly diffuse the three primary colors in the light path, so that the three primary colors pass through the light diffusion module 80 to form three primary colors with a horizontal diffusion angle greater than a vertical diffusion angle. At this time, the spot size and spot shape of the three primary colors are controllable, so that after the three primary colors after the angle diffusion are further modulated by the light modulation module 30, the modulated image light can fill the eye box area, thereby preventing the image light from being projected outside the eye box area, improving the utilization rate of the light beam, and further improving the brightness of the display image formed by the light beam at the human eye.

[0049] In the present embodiment, the three-primary-color light source module 10 further includes an optical adhesive layer arranged at the gap between the plurality of light-emitting chips distributed in the array, so as to reflect the light having a Lambertian distribution emitted by the light-emitting chip into the cone rod 20 for collection, thereby improving the light beam utilization rate and display uniformity of the device. In addition, a reflective brightness enhancement film 60 combined with the polarizer 50 is further provided in the head-up display device. When the polarizer 50 divides the three-primary-color light into the first polarized light and the second polarized light, the reflective brightness enhancement film 60 transmits the first polarized light to the light modulation module 30, and through the cooperation of the reflective brightness enhancement film 60 and the optical adhesive layer, the second polarized light is reflected multiple times and most of the second polarized light is recycled, thereby further improving the light beam utilization rate in the device and improving the illumination color uniformity of the three-primary-color light at the light modulation module 30.

[0050] Please refer to Figure 6 , Figure 6 FIG. 2 shows a schematic diagram of the structure of a head-up display device provided by another embodiment of the present application. Figure 6 As shown, the head-up display device of the present application includes a three-primary color light source module 10 , a cone rod 20 , a light modulation module 30 , a first filter 40 , a polarizer 50 , a reflective brightness enhancement film 60 , a light receiving module 70 and a light diffusion module 80 .

[0051] In this embodiment, a plane where the first filter 40 disposed at the light output of the light modulation module 30 is located forms a set angle with the plane where the light modulation module 30 is located. The first filter 40 can transmit the image light formed by the light modulation module 30 based on the three primary colors to the windshield 2. The first filter 40 is also used to reflect other visible light except the three primary colors, that is, the light of the first filter 40 can also reflect most of the light beams in the ambient light incident on the head-up display device. In addition, the head-up display device also includes a light absorbing sheet, and the light absorbing sheet ( Figure 6 The light absorbing sheet is used to absorb other visible light reflected by the first filter 40, so that other visible light reflected by the first filter 40 (for example, other visible light in sunlight except the three primary colors) will not enter the optical path of the head-up display device, thereby preventing other visible light reflected by the first filter 40 from entering the human eye together with the image light after being transmitted in the optical path, causing stray light or ghosting problems at the human eye.

[0052] Optionally, the head-up display device further includes a first free-form surface mirror 90 and a second free-form surface mirror 100, wherein the first free-form surface mirror 90 is arranged in the light emitting direction of the light modulation module 30, and the second free-form surface mirror 100 is arranged in the light reflecting direction of the first free-form surface mirror 90, and the first free-form surface mirror 90 is used to reflect the image light emitted by the light modulation module 30 to the second free-form surface mirror 100, so that the second free-form surface mirror 100 reflects the image light to the windshield 2. When the image light emitted by the light modulation module 30 is reflected by the two free-form surface mirrors, the two free-form surface mirrors can not only reflect the image light to the windshield 2, but also amplify the received image light for imaging, so that when the display image formed by the image light is reflected to the area where the human eye is located, the size of the image screen at the human eye is more suitable for viewing by the human eye. For example, when the image light is reflected by the windshield 2 and enters the human eye, the horizontal diffusion angle of the virtual image observed by the human eye (i.e., the diffusion angle in the length direction of the windshield 2) can be greater than 10°, the vertical diffusion angle of the virtual image (i.e., the diffusion angle in the height direction of the windshield 2) can be greater than 3°, and the distance of the virtual image observed by the human eye can be greater than 7.5m.

[0053] In this embodiment, the image light emitted by the light modulation module 30 is the second polarized light, and the head-up display device further includes a second filter 110, which is arranged in the light reflection direction of the second free-form surface mirror 100, wherein the second filter 110 may be a filter integrated with an infrared blocking film, an ultraviolet blocking film, and a polarizing film. The polarization direction of the second filter 110 matches the polarization direction of the image light emitted by the light modulation module 30, and the second filter 110 is used to transmit the image light reflected by the second free-form surface mirror 100 to the windshield 2, and the second filter 110 is also used to reflect invisible light.

[0054] Optionally, since the polarization direction of the second filter 110 matches the polarization direction of the image light emitted by the light modulation module 30, it is ensured that no light energy loss occurs when the image light passes through the second filter 110 and is projected onto the windshield 2. At the same time, since the external ambient light (such as sunlight) is natural light, the ambient light will be converted into linear polarized light matching the polarization direction of the second polarized light when it enters the head-up display device through the second polarized light, thereby reducing the energy of half of the ambient light that enters the head-up display device in the opposite direction of the emission direction of the image light, and further reducing the energy of the ambient light that can be projected into the light modulation module 30 in the opposite direction of the emission direction of the image light. Furthermore, the first filter 40 is used to reflect other visible light in the ambient light except the three primary colors, and the second filter 110 is used to reflect invisible light (such as infrared light and ultraviolet light) in the ambient light. Thus, the cooperation of the two filters further reduces the energy of the ambient light projected into the optical modulation module 30, ensuring that the temperature of the optical modulation module 30 is within the normal operating temperature range when it is working, so as to prevent the optical modulation module 30 from being burned during operation.

[0055] In this embodiment, the head-up display device forms a set angle between the plane where the first filter 40 is located and the plane where the light modulation module 30 is located, so that other visible light reflected by the first filter 40 will not enter the light path of the head-up display device, thereby avoiding the problem of stray light or ghosting at the human eye. In addition, by further providing a second filter 110 that matches the polarization direction of the image light emitted by the light modulation module 30, the first filter 40 and the second filter 110 are used in conjunction with each other to ensure that the three primary colors emitted by the three primary color light source module 10 can be transmitted as much as possible during the process of passing through the two filters and projecting to the windshield 2, so as to improve the light beam utilization rate of the device, and further reduce the energy of the ambient light projected into the light modulation module 30, thereby ensuring that the temperature of the light modulation module 30 can be within the normal operating temperature range when it is working, and avoiding the light modulation module 30 from being burned during the working process.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A head-up display device for projecting image light onto a windshield of a vehicle, characterized in that: The head-up display device comprises: A three-primary-color light source module, for emitting three-primary-color light, the three-primary-color light source module comprising a plurality of light-emitting chips distributed in an array, wherein the plurality of light-emitting chips comprise a plurality of red light diodes, a plurality of green light diodes and a plurality of blue light diodes, the plurality of red light diodes, the plurality of green light diodes and the plurality of blue light diodes are axially symmetrically distributed in the length direction of the windshield, and the color lights emitted by adjacent light-emitting chips are different from each other; A cone rod is arranged at the light output position of the three-primary-color light source module, and is used to collect the three-primary-color light and perform homogenization processing on the three-primary-color light before outputting; A light modulation module is arranged in the light emitting direction of the cone rod, and is used to modulate the three primary color lights emitted by the cone rod, and emit the image light formed by the modulation; The first filter is arranged at the light output of the light modulation module, and is used to transmit the image light to the windshield, so that the image light enters the human eye after being reflected by the windshield.

2. The head-up display device according to claim 1, characterized in that: The three primary color lights emitted by the plurality of light emitting chips are lights with Lambertian distribution; The three-primary-color light source module further includes an optical adhesive layer, which is disposed at the gaps between the plurality of light-emitting chips distributed in an array, and is used to reflect the light with Lambertian distribution to the cone rod.

3. The head-up display device according to claim 2, characterized in that: The head-up display device also includes a polarizer and a reflective brightness enhancement film; The polarizer is arranged at the light outlet of the cone rod, and is used to separate the three primary color lights into a first polarized light and a second polarized light, wherein the polarization direction of the first polarized light is perpendicular to the polarization direction of the second polarized light; The reflective brightness enhancement film is bonded to the polarizer, and is used to transmit the first polarized light to the light modulation module so that the light modulation module modulates the first polarized light and outputs it, and to reflect the second polarized light to the optical adhesive layer so that the optical adhesive layer reflects the second polarized light to the conical rod, wherein the polarization direction of a portion of the light beam in the second polarized light after reflection matches the polarization direction of the first polarized light.

4. The head-up display device according to claim 3, characterized in that: The head-up display device also includes a light receiving module and a light diffusion module; The light receiving module is arranged at the light output position of the cone rod, and is used to collect the three primary color lights outputted from the cone rod, and collimate the three primary color lights before outputting them; The light diffusion module is disposed between the light receiving module and the reflective brightness enhancement film, and is used for angularly diffusing the three primary color lights emitted from the light receiving module before emitting them.

5. The head-up display device according to claim 4, characterized in that: The light receiving module is a Fresnel lens, a spherical lens, an aspherical lens or a free-form mirror.

6. The head-up display device according to claim 4, characterized in that: The light diffusion module is an elliptical Gaussian scattering sheet or a light diffraction sheet; The light diffusion module is used to perform angular diffusion on the horizontal diffusion angle and vertical diffusion angle of the three primary colors of light, wherein the horizontal diffusion angle after angular diffusion is greater than the vertical diffusion angle, the horizontal diffusion angle is the diffusion angle of the three primary colors of light in the length direction of the windshield, and the vertical diffusion angle is the diffusion angle of the three primary colors of light in the height direction of the windshield.

7. The head-up display device according to any one of claims 1 to 6, characterized in that: A set angle is formed between the plane where the first filter is located and the plane where the light modulation module is located, and the first filter is also used to reflect other visible light except the three primary colors; The head-up display device further includes a light absorbing sheet, which is disposed in the light reflecting direction of the first optical filter and is used for absorbing the other visible light reflected by the first optical filter.

8. The head-up display device according to any one of claims 1 to 6, characterized in that: The head-up display device further includes a first free-form surface mirror and a second free-form surface mirror; The first free-form surface mirror is arranged in the light emitting direction of the light modulation module, and the second free-form surface mirror is arranged in the light reflecting direction of the first free-form surface mirror. The first free-form surface mirror is used to reflect the image light emitted by the light modulation module to the second free-form surface mirror, so that the second free-form surface mirror reflects the image light to the windshield.

9. The head-up display device according to claim 8, characterized in that: The head-up display device further includes a second filter, which is arranged in the light reflection direction of the second free-form surface mirror, and the polarization direction of the second filter matches the polarization direction of the image light emitted by the light modulation module; The second filter is used to transmit the image light reflected by the second free-form surface mirror to the windshield, and the second filter is also used to reflect invisible light and polarized light whose polarization direction is perpendicular to the polarization direction of the image light.

10. The head-up display device according to any one of claims 1 to 6, characterized in that: The cone rod comprises a light inlet and a light outlet. The size of the light inlet matches the size of the three-primary-color light source module, and the size of the light outlet matches the size of the light modulation module.

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