Head-up display and protection method therefor, and transportation vehicle

Abstract

The present application provides a head-up display and a protection method therefor, and a transportation vehicle. The head-up display comprises: a first housing, a display module, a reflection module, a first light intensity measurement module, and a second light intensity measurement module; the first housing is internally provided with an accommodating space, and the first housing is further provided with a light outlet; the reflection module, the display module and the second light intensity measurement module are all arranged in the accommodating space; the first light intensity measurement module is arranged outside the accommodating space; the reflection module is arranged on a light exit side of the display module; and the first light intensity measurement module and the second light intensity measurement module are both arranged on a light path of external light incident into the interior of the head-up display. The head-up display implements measurement of sunlight intensity by means of the first light intensity measurement module, and implements measurement of internal light intensity of the head-up display by means of the second light intensity measurement module; and on the basis of a combination of the measured sunlight intensity and internal light intensity, it can be subsequently determined whether to perform a protection action, so as to implement protection on the head-up display during sunlight backflow.

Description

Head-up display and protection method thereof, and vehicle

[0001] Cross Reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202411383158.1 filed on September 30, 2024, and entitled "Head-up display and protection method thereof, and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] Embodiments of the present application relate to the technical field of head-up display, and particularly relate to a head-up display and a protection method thereof, and a vehicle. BACKGROUND

[0004] The head-up display system is usually used on a car, and can project information on the car's instrument panel and navigation information to the human eye, so that the driver can see the required information without lowering his head when looking straight at the actual driving road conditions, thereby improving the driving experience and safety of the driver. For example, when the head-up display is used as a vehicle-mounted projection equipment for enhancing driving safety, the driver can see the vehicle speed, navigation and many other driving information without deviating from the surrounding environment.

[0005] With the increase of the image display area of the head-up display, the magnification of the head-up display is getting higher and higher, and the risk of sunlight backflow is getting bigger. The sunlight energy will be more concentrated on the image generation unit, which may cause material aging, thermal stress damage, and even direct burning, and other serious consequences, damaging the image generation unit. SUMMARY

[0006] Embodiments of the present application provide a head-up display and a protection method thereof, and a vehicle, which can detect the internal light intensity and the sunlight intensity, and subsequently protect the head-up display when sunlight backflow occurs based on the light intensity of the two.

[0007] In a first aspect, the embodiments of the present application provide a head-up display, comprising: a first housing, a display module, a reflection module, a first light intensity detection module and a second light intensity detection module; the first housing is internally provided with a receiving space, the first housing is further provided with an light outlet, the reflection module, the display module and the second light intensity detection module are all arranged in the receiving space, the first light intensity detection module is arranged outside the receiving space, the reflection module is arranged on the light outlet side of the display module, the first light intensity detection module and the second light intensity detection module are both arranged on the light path of external light incident into the head-up display; wherein the display module is used for emitting first light with image information to the reflection module; the reflection module is used for reflecting the first light, so that the first light is emitted through the light outlet; the first light intensity detection module comprises at least three light intensity sensors, each light intensity sensor is used for detecting sunlight intensity; the second light intensity detection module is used for detecting internal light intensity in the receiving space.

[0008] In some embodiments, each light intensity sensor has a photosensitive surface for receiving the external light, the planes where the photosensitive surfaces of each light intensity sensor are located are perpendicular to each other, or the planes where the photosensitive surfaces of each light intensity sensor are located are not perpendicular to each other.

[0009] In some embodiments, the first light intensity detection module further comprises a second housing; the second housing has a plurality of side surfaces, the number of the side surfaces is equal to the number of the light intensity sensors, and the side surfaces correspond to the light intensity sensors one by one, and the photosensitive surface of each light intensity sensor is arranged on the corresponding side surface.

[0010] In some embodiments, the central axis of the second housing is parallel to the external light.

[0011] In some embodiments, the reflection module comprises at least one first reflector; the first reflector is used for reflecting the first light, reflecting a part of the external light and transmitting another part of the external light; the second light intensity detection module is arranged on the transmission light path of the external light transmitted through the first reflector.

[0012] In some embodiments, the head-up display further comprises a light splitting module; the light splitting module is arranged between the light outlet side of the display module and the reflection module; the second light intensity detection module is arranged on the reflection light path of the external light reflected by the light splitting module; wherein the light splitting module is used for transmitting the first light to the reflection module, transmitting a part of the external light to the display module and reflecting another part of the external light to the second light intensity detection module.

[0013] In some embodiments, the second light intensity detection module is arranged on a reflection light path of the ambient light reflected by the display module.

[0014] In some embodiments, the display module comprises an LCD.

[0015] In a second aspect, the embodiments of the present application provide a vehicle, comprising a windshield and the head-up display according to any one of the first aspect; the windshield is arranged on the light exit side of the head-up display.

[0016] In a third aspect, the embodiments of the present application provide a protection method of a head-up display, the protection method is applied to the head-up display according to any one of the second aspect, and the protection method comprises: acquiring an internal light intensity of the head-up display; determining whether sunlight backflow occurs based on the internal light intensity; if the sunlight backflow occurs, acquiring a sunlight light intensity value perpendicular to the direction of the ambient light; and determining whether to start a protection action based on the sunlight light intensity value.

[0017] Compared with the prior art, the beneficial effects of the present application are: different from the prior art, the embodiments of the present application provide a head-up display, a protection method thereof, and a vehicle, the head-up display comprising: a first housing, a display module, a reflection module, a first light intensity detection module, and a second light intensity detection module; the first housing is internally provided with a receiving space, and the first housing is further provided with a light exit opening; the reflection module, the display module, and the second light intensity detection module are all arranged in the receiving space; the first light intensity detection module is arranged outside the receiving space; the reflection module is arranged on the light exit side of the display module; the first light intensity detection module and the second light intensity detection module are both arranged on the light path of the ambient light incident into the interior of the head-up display; wherein the display module is used for emitting first light with image information to the reflection module; the reflection module is used for reflecting the first light, so that the first light exits through the light exit opening; the first light intensity detection module comprises at least three light intensity sensors, each light intensity sensor is used for detecting sunlight light intensity; and the second light intensity detection module is used for detecting the internal light intensity in the receiving space. The head-up display realizes sunlight light intensity detection through the first light intensity detection module, and realizes internal light intensity detection of the head-up display through the second light intensity detection module; subsequently, whether to perform a protection action can be determined based on the combination of the two, so as to protect the head-up display when sunlight backflow occurs. BRIEF DESCRIPTION OF DRAWINGS

[0018] One or more embodiments are illustrated by way of example in the drawings, which are for illustrative purposes only and are not meant to limit the embodiments, elements / modules / steps with the same reference numerals in different figures indicate the same elements / modules / steps unless otherwise specified, the drawings are not to scale.

[0019] FIG. 1 is a structural schematic diagram of a head-up display according to an embodiment of the present application;

[0020] FIG. 2 is a structural block diagram of a head-up display according to an embodiment of the present application;

[0021] FIG. 3 is a structural schematic diagram of a first light intensity detection module according to an embodiment of the present application;

[0022] FIG. 4 is a structural schematic diagram of another first light intensity detection module according to an embodiment of the present application;

[0023] FIG. 5 is a schematic diagram of an equivalent geometric model according to an embodiment of the present application;

[0024] FIG. 6 is a structural schematic diagram of another head-up display according to an embodiment of the present application;

[0025] FIG. 7 is a structural schematic diagram of another head-up display according to an embodiment of the present application;

[0026] FIG. 8 is a structural schematic diagram of another head-up display according to an embodiment of the present application;

[0027] FIG. 9 is a flowchart of a protection method of a head-up display according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] The present application will be described in detail below with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application. These are within the scope of protection of the present application.

[0029] In order to facilitate understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used in the specification have the same meaning as understood by those skilled in the art. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification includes any and all combinations of one or more related listed items.

[0030] It should be noted that the various features in the embodiments of the present application can be combined with each other without conflict, and are within the scope of protection of the present application. In addition, although the functional modules are divided in the device schematic diagram, in some cases, the module division in the device can be different. In addition, the terms "first", "second", etc. used herein do not limit the data and execution order, but only distinguish the same items or similar items with basically the same function and effect.

[0031] In the head-up display, referring to FIG. 1, if the sunlight backflow occurs, the sunlight will finally focus on the display module 1 after passing through the windshield glass 4, the mirror 3 and the reflection of the mirror 2. When the illumination intensity of the sunlight is too strong, the sunlight focused on the display module 1 is too strong, thereby causing the temperature of the display module 1 to rise and the screen to burn.

[0032] In order to improve the above technical problems, the embodiments of the present application provide a head-up display and a protection method thereof, and a vehicle. The illumination intensity of the backflow sunlight is detected by a plurality of sensors, and subsequent protection actions can be performed based on the detected illumination intensity, thereby protecting the display module.

[0033] In a first aspect, the embodiments of the present application provide a head-up display 100, referring to FIG. 2, the head-up display 100 comprises a first housing 10, a display module 20, a reflection module 30, a first light intensity detection module 40 and a second light intensity detection module 50.

[0034] The first housing 10 is provided with a receiving space, and the first housing 10 is also provided with a light outlet. The reflection module 30, the display module 20 and the second light intensity detection module 50 are all arranged in the receiving space, and the first light intensity detection module 40 is arranged outside the receiving space. The reflection module 30 is arranged on the light outlet side of the display module 20, and the first light intensity detection module 40 and the second light intensity detection module 50 are both arranged on the light path of external light L2 incident into the inside of the head-up display 100.

[0035] The display module 20 is used to emit first light L1 with image information to the reflection module 30. The reflection module 30 is used to reflect the first light L1, so that the first light L1 is emitted through the light outlet. The first light intensity detection module 40 comprises at least three light intensity sensors, each of which is used to detect the sunlight illumination intensity. The second light intensity detection module 50 is used to detect the internal illumination intensity in the receiving space.

[0036] The first housing 10 has a receiving space inside, which can be used to accommodate the display module 20, the reflection module 30 and the second light intensity detection module 50. The shape of the first housing 10 can be set according to actual needs, which is not limited here.

[0037] The display module 20 comprises a liquid crystal display (LCD). The LCD is a device that uses the optical properties of liquid crystal materials to display images. It includes one or more thin films containing liquid crystal materials, and the molecules of these materials can be oriented by the action of an electric field. The LCD is usually composed of several layers, including polarizing plates, glass substrates, liquid crystal layers, color filters, etc. The specific structure can refer to the prior art, which is not limited here.

[0038] The reflection module 30 is located in the light exit path of the display module 20 and can receive the first light L1 emitted by the display module 20. The reflection module 30 includes a mirror, a reflective prism, a reflective film, or other suitable optical devices that can be used to change the propagation direction of light.

[0039] The second light intensity detection module 50 and the light intensity sensor can each include a photoresistor, a photodiode, a light power meter, an illuminometer, a solar irradiance meter, or other devices, so that the second light intensity detection module 50 and the light intensity sensor can detect the light intensity.

[0040] In the head-up display 100, the first light L1 generated by the display module 20 can be reflected by the reflection module 30. When the head-up display 100 is applied to a vehicle, the reflection module 30 can reflect the first light L1 to the windshield glass 200. After being reflected by the windshield glass 200, the first light L1 can enter the human eye, and the human eye can observe the image content, thereby realizing head-up display.

[0041] When the sunlight backflows, that is, the external light L2 is transmitted through the windshield glass 200 to the inside of the head-up display 100, the external light L2 will be reflected to the display module 20 by the reflection module 30. The first light intensity detection module 40 and the second light intensity detection module 50 are both arranged on the propagation path of the external light L2. Therefore, the first light intensity detection module 40 can measure the sunlight intensity and detect the light intensity of the external light L2 entering the inside of the head-up display 100. In addition, since the reflection module 30, the display module 20, and the second light intensity detection module 50 are all arranged in the internal accommodation space of the first shell 10, the scattering of the first light L1 and the external light L2 when passing through the devices enables the second light intensity detection module 50 to detect the light intensity in the internal accommodation space of the first shell 10, that is, the internal light intensity.

[0042] In the head-up display 100 provided in the embodiment, the internal light intensity detected by the second light intensity detection module 50 can be used to determine whether the sunlight backflow occurs. After the sunlight backflow occurs, the sunlight intensity is detected by the first light intensity detection module 40, so that the protection operation can be performed according to the light intensity. The protection operation can be to control the rotation of the reflection module 30, so that the external light L2 is reflected to other places instead of the display module 20, or to control the display module 20 to turn off the display, thereby protecting the display module 20 when the sunlight backflow occurs. In addition, in the present application, multiple light intensity sensors are used to detect the sunlight intensity. The design of multiple sensors can improve the accuracy of sunlight intensity detection.

[0043] In some embodiments, each light intensity sensor has a light receiving surface for receiving the external light L2, and the light receiving surfaces of the light intensity sensors are perpendicular to each other.

[0044] The light receiving surface is a surface of the light intensity sensor for receiving the external light L2, which is usually a plane and is formed by a photosensitive element and can sense incident light and generate a response. In addition, the light intensity sensors have the same structure, and the light receiving surfaces of the light intensity sensors have the same area.

[0045] The light receiving surfaces of the light intensity sensors are perpendicular to each other means that the plane in which the light receiving surface of each light intensity sensor is located is perpendicular to the plane in which the light receiving surface of any other light intensity sensor is located. The light receiving surfaces of the light intensity sensors are not perpendicular to each other means that the plane in which the light receiving surface of each light intensity sensor is located is not perpendicular to the plane in which the light receiving surface of any other light intensity sensor is located, that is, the included angle between them is not 90 degrees.

[0046] It can be understood that, when sunlight backflow occurs, the light intensity (or illumination, irradiance) of sunlight in the direction perpendicular to the sunlight direction is usually considered, rather than the light intensity of sunlight in the direction of the sea level or in other directions. In order to accurately measure the light intensity of sunlight in the direction perpendicular to the sunlight direction, if a single light intensity sensor is used for measurement, when the direction of the sunlight is not perpendicular to the light receiving surface of the light intensity sensor, the light intensity directly measured by the light intensity sensor cannot represent the real light intensity in the direction perpendicular to the sunlight direction. In the present embodiment, by making the light receiving surfaces of the light intensity sensors perpendicular to each other or not perpendicular to each other, the error caused by a single light intensity sensor can be eliminated, and by obtaining the light intensity detected by each light intensity sensor and the angle between the light receiving surface of each light intensity sensor and the direction of the sunlight, the light intensity of sunlight in the direction perpendicular to the sunlight direction can be calculated, thereby improving the accuracy of measurement.

[0047] In some embodiments, the first light intensity detection module 40 further comprises a second housing. The second housing has a plurality of sides, the number of the sides is equal to the number of the light intensity sensors, and each side corresponds to one light intensity sensor, and the light receiving surface of each light intensity sensor is arranged on the corresponding side.

[0048] The second housing is used for fixing the light intensity sensors, and the specific shape of the second housing can be set according to actual needs, which is not limited herein.

[0049] Specifically, as shown in FIG. 3, the light intensity detection module includes a second shell, a light intensity sensor 411, a light intensity sensor 412, and a light intensity sensor 413. The second shell has a shape of a right triangular pyramid. The outer side surfaces A1B1D1, A1C1D1, and A1B1C1 of the right triangular pyramid are perpendicular to each other. The light sensing surface of the light intensity sensor 411, the light sensing surface of the light intensity sensor 412, and the light sensing surface of the light intensity sensor 413 are arranged on the three outer side surfaces of the second shell, respectively. The centers of the light sensing surfaces of the light intensity sensors are equidistant from the bottom surface of the second shell, and the centers of the light sensing surfaces of the light intensity sensors are in the same plane and perpendicular to the bottom surface.

[0050] Alternatively, as shown in FIG. 4, the second shell has a shape of a right triangular pyramid without a bottom surface. The inner side surfaces A2B2D2, A2C2D2, and A2B2C2 of the right triangular pyramid are perpendicular to each other. The light sensing surface of the light intensity sensor 411, the light sensing surface of the light intensity sensor 412, and the light sensing surface of the light intensity sensor 413 are arranged on the three inner side surfaces of the second shell, respectively.

[0051] In the embodiment, the light intensity sensors are arranged on the second shell, and the position of the light intensity detection module can be conveniently set subsequently.

[0052] In some embodiments, the central axis of the second shell is parallel to the external light L2.

[0053] Specifically, in the embodiment shown in FIG. 3, the central axis of the second shell is a straight line connecting the top vertex of the second shell and the center of the bottom surface B1C1D1. By arranging the central axis of the second shell to be parallel to the external light L2, and because the light sensing surfaces of the light intensity sensors have the same size, the light intensity sensors can receive the same light intensity. The light intensity of the sunlight perpendicular to the direction of the sunlight can be conveniently calculated subsequently.

[0054] Because the light sensing surfaces of the light intensity sensors 411, 412, and 413 have the same area, the light sensing surfaces of the sensors are simplified as equilateral right-angled triangles for convenience. As shown in FIG. 5, the light intensity sensor 411 is equivalent to a right-angled triangle ABC, the light intensity sensor 412 is equivalent to a right-angled triangle ACD, and the light intensity sensor 413 is equivalent to a right-angled triangle ABD. The three side edges AB, AC, and AD of the triangular pyramid A-BCD are perpendicular to each other. O is the projection of point A on the bottom surface BCD. BO and DO are connected,

[0055] BA is perpendicular to CA, BA is perpendicular to DA, and CA intersects DA at A.

[0056] Therefore, BA is perpendicular to the plane ACD, and CD is in the plane ACD.

[0057] Therefore, CD is perpendicular to BA.

[0058] Since AO is perpendicular to the plane BDC, CD is in the plane BDC,

[0059] Therefore, CD is perpendicular to AO,

[0060] Since AO intersects BA at A,

[0061] Therefore, CD is perpendicular to the plane ABO, i.e., BO is perpendicular to CD,

[0062] Therefore, BO is the height of DC.

[0063] Similarly, DO is the height of BC, so O is the orthocenter of triangle BDC. In the right-angle space tetrahedron ABCD, O is the orthocenter of triangle BCD. When BO and CD are extended to intersect at point E, E is the center of CD, so AE is perpendicular to CD. Since AB, AC and AD are perpendicular to each other, the projection of A on the bottom surface O is the orthocenter of the bottom surface triangle BCD. Therefore, BE is perpendicular to CD, so we have:

[0064] Then, assuming that the sensing coefficient of the light intensity sensor is α, the intensity of the sunlight in the direction of AO is

[0065] That is, in the embodiment shown in FIG. 3, if the light intensities detected by the light intensity sensor 411, the light intensity sensor 412 and the light intensity sensor 413 are x, y and z respectively, then the light intensity of the sunlight perpendicular to the direction of the sunlight is I = x + y + z.

[0066] In this embodiment, the method of using multiple sensors for measurement can reduce the error caused by a single light intensity sensor, and the light intensity of the sunlight perpendicular to the direction of the sunlight can be calculated from the light intensities detected by multiple light intensity sensors.

[0067] In some embodiments, after the internal illumination intensity measured by the second light intensity detection module 50 is obtained, the internal illumination intensity is compared with the first threshold value. If the internal illumination intensity is greater than the first threshold value, it is considered that sunlight backflow occurs. If the internal illumination intensity is less than the first threshold value, it is considered that sunlight backflow does not occur. Then, the illumination intensity perpendicular to the direction of the external light L2 is calculated according to the illumination intensity detected by each light intensity sensor in the first light intensity detection module 40. As shown in the embodiment of FIG. 3, if sunlight backflow occurs, the sunlight illumination intensity perpendicular to the sunlight direction is calculated according to I = x + y + z. Then, the sunlight illumination intensity is compared with the second threshold value. If the sunlight illumination intensity is greater than the second threshold value, it is determined that the protection action is started. If the sunlight illumination intensity is less than the second threshold value, it is determined that the protection action is not started. The protection action can be to control the reflection module 30 to rotate so that the external light L2 is reflected to other places instead of the display module 20, or to control the display module 20 to close the display, thereby protecting the display module 20.

[0068] In actual applications, the arithmetic mean of the illumination intensity detected by each light intensity sensor can also be compared with the second threshold value to determine whether the protection action is started. The second threshold value can be 1050 W / square meter, which is set according to actual needs and is not limited herein. The second threshold value can be set according to actual needs and is not limited herein.

[0069] It can be seen that in the head-up display 100 provided in the present application, whether sunlight backflow occurs can be determined based on the internal illumination intensity detected by the second light intensity detection module 50 first. After sunlight backflow occurs, the sunlight illumination intensity perpendicular to the sunlight direction is calculated based on the illumination intensity detected by each light intensity sensor, and whether the protection action is started is determined based on the sunlight illumination intensity perpendicular to the sunlight direction. This can reduce the case of false triggering of the protection action and improve the reliability and accuracy of the protection action.

[0070] In some embodiments, referring to FIG. 6, the reflection module 30 includes at least one first mirror 31. The first mirror 31 is used to reflect the first light L1, reflect a part of the external light L2, and transmit another part of the external light L2. The second light intensity detection module 50 is arranged on the transmission light path of the external light L2 transmitted by the first mirror 31.

[0071] The reflectivity of the first mirror 31 to the first light L1 is close to 100%, the transmittance of the first mirror 31 to the first light L1 is close to 0%, and the reflectivity and transmittance of the first mirror 31 to the external light L2 can be 50%. In actual applications, the reflectivity and transmittance of the first mirror 31 to the external light L2 can be set according to actual needs.

[0072] Specifically, the reflection module 30 further comprises at least one second mirror 32, and the second mirror 32 is configured to reflect the first light L1. The reflectivity of the second mirror 32 to the first light L1 and the ambient light L2 is close to 100%, and the transmissivity of the second mirror 32 to the first light L1 and the ambient light L2 is close to 0%.

[0073] For example, referring to FIG. 6, the reflection module 30 comprises the first mirror 31 and the second mirror 32, wherein the first mirror 31 is arranged on the light exit side of the display module 20, the second mirror 32 is arranged on the light path of the first light L1 reflected by the first mirror 31, the windshield glass 200 is arranged on the light path of the first light L1 reflected by the second mirror 32, and the second light intensity detection module 50 is arranged on the light path of the ambient light L2 transmitted by the first mirror 31. It should be noted that the photosensitive surface of the second light intensity detection module 50 should be arranged to face the ambient light L2, so as to ensure that the photosensitive surface of the second light intensity detection module 50 can receive the ambient light L2.

[0074] In the head-up display 100, the first light L1 exits the display module 20, propagates to the first mirror 31, is reflected by the first mirror 31, is reflected by the second mirror 32, is reflected by the windshield glass 200, and then enters the human eye, thereby realizing head-up display.

[0075] In actual application, the surface type of the first mirror 31 and the second mirror 32 can be a plane or a curved surface, and the curved surface can be a free-form surface. In this way, the surface of the mirror can be designed to shape the first light L1 and correct aberration.

[0076] In this embodiment, the internal light illumination intensity can be detected by the first mirror 31 and the second light intensity detection module 50.

[0077] In some embodiments, referring to FIG. 7, the head-up display 100 further comprises a light splitting module 60, the light splitting module 60 is arranged between the light exit side of the display module 20 and the reflection module 30, the second light intensity detection module 50 is arranged on the reflection light path of the ambient light L2 reflected by the light splitting module 60, and the light splitting module 60 is configured to transmit the first light L1 to the reflection module 30, transmit a part of the ambient light L2 to the display module 20, and reflect another part of the ambient light L2 to the second light intensity detection module 50.

[0078] The light splitting module 60 can comprise a light splitting mirror, a light splitting prism or other suitable optical device, the transmissivity of the light splitting module 60 to the first light L1 is close to 100%, the reflectivity of the light splitting module 60 to the first light L1 is close to 0%, the transmissivity of the light splitting module 60 to the ambient light L2 is close to 50%, and the reflectivity of the light splitting module 60 to the ambient light L2 is close to 50%. In actual application, the transmissivity and reflectivity of the light splitting module 60 to the first light L1 and the transmissivity and reflectivity of the light splitting module 60 to the ambient light L2 can be set according to actual needs.

[0079] In some embodiments, as shown in FIG. 7, the light splitting module 60 adopts a light splitting mirror, the reflection module 30 includes a second mirror 33 and a second mirror 34, the light splitting mirror is arranged on the light exit side of the display module 20, the second mirror 33 is arranged on the light path of the first light L1 transmitted by the light splitting mirror, the second mirror 34 is arranged on the light path of the first light L1 reflected by the second mirror 33, the windshield 200 is arranged on the light path of the first light L1 reflected by the second mirror 34, and the second light intensity detection module 50 is arranged on the light path of the external light L2 reflected by the light splitting mirror.

[0080] In the head-up display 100, after the first light L1 exits the display module 20, it can enter the human eye after being transmitted by the light splitting module 60, reflected by the second mirror 33, reflected by the second mirror 34, and reflected by the windshield 200, thereby realizing head-up display. At the same time, if sunlight backflow occurs, the external light L2 will be transmitted by the windshield 200, reflected by the second mirror 33, and reflected by the second mirror 34 to the light splitting module 60, part of the external light L2 is transmitted to the display module 20 by the light splitting module 60, and the other part of the external light L2 is reflected to the second light intensity detection module 50 by the light splitting module 60, and the second light intensity detection module 50 will detect the light intensity.

[0081] In this embodiment, the internal light intensity detection is realized by the light splitting module 60 and the second light intensity detection module 50.

[0082] In some embodiments, the second light intensity detection module 50 is arranged on the reflection light path of the external light L2 reflected by the display module 20.

[0083] In some embodiments, as shown in FIG. 8, the reflection module 30 includes a second mirror 35 and a second mirror 36, the second mirror 35 is arranged on the light exit side of the display module 20, the second mirror 36 is arranged on the light path of the first light L1 reflected by the second mirror 35, the windshield 200 is arranged on the light path of the first light L1 reflected by the second mirror 36, and the second light intensity detection module 50 is arranged on the light path of the external light L2 reflected by the display module 20. It should be noted that in this embodiment, the light exit surface of the display module 20 is not perpendicular to the first light L1, so that the external light L2 can be reflected to the second light intensity detection module 50.

[0084] In the head-up display 100, after the first light L1 exits the display module 20, it can enter the human eye after being transmitted by the light splitting module 60, reflected by the second mirror 33, reflected by the second mirror 34, and reflected by the windshield 200, thereby realizing head-up display. At the same time, if sunlight backflow occurs, the external light L2 will be transmitted by the light splitting module 60, reflected by the second mirror 33, and reflected by the second mirror 34 to the light splitting module 50, part of the external light L2 is transmitted to the display module 20 by the light splitting module 60, and the other part of the external light L2 is reflected to the second light intensity detection module 50 by the light splitting module 60, and the second light intensity detection module 50 will detect the light intensity.

[0085] In a second aspect, the embodiments of the present application provide a vehicle, which comprises a windshield 200 and the head-up display 100 according to any one of the first aspect; the windshield 200 is arranged on the light emitting side of the head-up display 100.

[0086] In the embodiments, the head-up display 100 has the same structure and function as the head-up display 100 according to any one of the embodiments of the first aspect, and will not be repeated here. The vehicle can be a car, a train or the like.

[0087] In a third aspect, the embodiments of the present application provide a protection method of the head-up display 100, which is applied to the head-up display 100 according to any one of the second aspect, and refers to FIG. 9, the protection method comprises the following steps:

[0088] Step S10: Obtain the internal light intensity of the head-up display 100.

[0089] The execution subject of the protection method can be a control device arranged in the head-up display 100 or an external control device, the control device comprising at least one processor; and a memory in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method according to the embodiments, and the specific model thereof can be set according to actual needs, which is not limited here.

[0090] Specifically, the control device can be electrically connected with the second light intensity detection module 50 respectively, so that the control device obtains the internal light intensity detected by the second light intensity detection module 50.

[0091] Step S20: Determine whether the sunlight backflow occurs based on the internal light intensity.

[0092] After obtaining the internal light intensity detected by the second light intensity detection module 50, the internal light intensity detected by the second light intensity detection module 50 can be compared with the first threshold value, if the internal light intensity is greater than the first threshold value, it is considered that the sunlight backflow occurs, if the internal light intensity is less than the first threshold value, it is considered that the sunlight backflow does not occur. The first threshold value can be 1050W / square meter, which is set according to actual needs, which is not limited here.

[0093] Step S30: If the sunlight backflow occurs, obtain the sunlight intensity value perpendicular to the direction of the external light L2.

[0094] Specifically, as shown in the embodiments of FIG. 3 or FIG. 4, if the sunlight backflow occurs, the light intensity value perpendicular to the direction of the external light L2 is calculated according to I=x+y+z. Specifically, the first light intensity detection module 40 includes three light intensity sensors, the light sensing surfaces of the three light intensity sensors are perpendicular to each other, and the areas of the light sensing surfaces of the three light intensity sensors are equal. The backflow light intensity is the light intensity value perpendicular to the direction of the external light L2. In the embodiments of FIG. 3 or FIG. 4, the control device can be electrically connected to each light intensity sensor respectively, so that the control device obtains the sunlight intensity detected by each light intensity sensor. Then, the sunlight intensity value perpendicular to the direction of the external light L2 is calculated according to I=x+y+z.

[0095] In the embodiment, the sunlight intensity value perpendicular to the direction of the external light L2 is calculated according to the sunlight intensity detected by each light intensity sensor, so that the sunlight intensity value is detected.

[0096] Step S40: determining whether to start the protection action based on the sunlight intensity value.

[0097] The sunlight intensity value is compared with the second threshold value. If the sunlight intensity value is greater than the second threshold value, it is determined to start the protection action. If the sunlight intensity value is less than the second threshold value, it is determined not to start the protection action. The protection action can be to control the reflection module 30 to rotate, so that the external light L2 is reflected to other places instead of the display module 20, or to control the display module 20 to close the display, so as to protect the display module 20. The second threshold value can be set according to actual needs, which is not limited here.

[0098] In the embodiment, the sunlight intensity value perpendicular to the direction of the external light L2 is calculated according to the sunlight intensity detected by each light intensity sensor, so that the sunlight intensity value is detected.

[0099] It should be noted that the apparatus embodiments described above are only schematic and that the units as described above can or can not be physically separate units. The units as displayed can or can not be physical units; that is, some or all units can be located in one place or distributed over multiple places. Some or all units can be selected according to actual needs to achieve the purpose of the embodiments.

[0100] Those skilled in the art can clearly understand the technical solutions of the embodiments from the above description of the embodiments, and the embodiments can be implemented by means of software plus a general hardware platform, or by hardware. Based on such an understanding, the above technical solutions, essentially or in terms of related art, can be embodied in the form of a software product, and the computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for executing the methods of the various embodiments or some parts of the methods by at least one computer device (which can be a personal computer, a server, or a network device, etc.).

[0101] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; under the idea of the present application, the technical features of the above examples or different examples can also be combined, the steps can be implemented in any order, and there are many other changes of the different aspects of the present application as described above, which are not provided in detail for simplicity; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A head-up display, characterized by, The head-up display comprises: a first shell, a display module, a reflection module, a first light intensity detection module and a second light intensity detection module; the first shell is internally provided with a receiving space, the first shell is further provided with a light outlet, the reflection module, the display module and the second light intensity detection module are all arranged in the receiving space, the first light intensity detection module is arranged outside the receiving space, the reflection module is arranged on the light outlet side of the display module, the first light intensity detection module and the second light intensity detection module are both arranged on the light path of external light incident into the head-up display; the display module is used for emitting first light with image information to the reflection module; the reflection module is used for reflecting the first light so that the first light is emitted through the light outlet; the first light intensity detection module comprises at least three light intensity sensors, each of the light intensity sensors is used for detecting sunlight intensity; the second light intensity detection module is used for detecting internal light intensity in the receiving space.

2. The head-up display of claim 1, wherein, Each of the light intensity sensors has a photosensitive surface for receiving the external light, the planes where the photosensitive surfaces of the light intensity sensors are located are all perpendicular to each other, or the planes where the photosensitive surfaces of the light intensity sensors are located are not perpendicular to each other.

3. The head-up display of claim 2, wherein, The first light intensity detection module further comprises a second shell; the second shell has a plurality of side surfaces, the number of the side surfaces is equal to the number of the light intensity sensors, and the side surfaces correspond to the light intensity sensors one by one, and the photosensitive surface of each of the light intensity sensors is arranged on the corresponding side surface.

4. The head-up display according to claim 3, wherein the central axis of the second shell is parallel to the external light.

5. The head-up display according to any one of claims 1 to 4, characterized in that The reflection module comprises at least one first reflector; the first reflector is used for reflecting the first light, reflecting a part of the external light and transmitting another part of the external light; the second light intensity detection module is arranged on a transmission light path of the external light transmitted through the first reflector.

6. The head-up display according to any one of claims 1 to 4, characterized in that The head-up display further comprises a light splitting module; the light splitting module is arranged between the light outlet side of the display module and the reflection module; the second light intensity detection module is arranged on a reflection light path of the external light reflected through the light splitting module; the light splitting module is used for transmitting the first light to the reflection module, transmitting a part of the external light to the display module and reflecting another part of the external light to the second light intensity detection module.

7. The head-up display according to any one of claims 1 to 4, characterized in that The second light intensity detection module is arranged on a reflection light path of the external light reflected through the display module.

8. The head-up display according to any one of claims 1 to 4, characterized in that The display module comprises an LCD.

9. A vehicle, characterized by The head-up display comprises a windshield glass and the head-up display according to any one of claims 1-7; the windshield glass is arranged on the light outlet side of the head-up display.

10. A method of protecting a head-up display, characterized by, The protection method is applied to the head-up display according to any one of claims 1-8, and the protection method comprises: obtaining internal light intensity of the head-up display; determining whether sunlight backflow occurs based on the internal light intensity; if sunlight backflow occurs, obtaining a sunlight intensity value perpendicular to the direction of the external light; determining whether to start a protection action based on the sunlight intensity value.

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