Backlight illumination module, imaging device, head-up display equipment and vehicle

Abstract

The utility model relates to the technical field of backlight illumination, and discloses a backlight illumination module, an imaging device, a head-up display device and a vehicle, and the backlight illumination module comprises a backlight source which is configured to output illumination light; the collimation dodging lens is arranged on the light emitting side of the backlight source; the deflecting lens is arranged on the light outlet side of the collimating and dodging lens, the deflecting lens comprises a base material and a plurality of lens parts arranged on the light inlet side of the base material, each lens part is provided with a light inlet surface, and the light inlet surfaces of the lens parts are obliquely arranged relative to the base material. The collimation dodging element breaks through the inherent mode that the emergent direction in the traditional backlight illumination module and the light path of the imaging device must be strictly matched from the beginning. And the deflection lens can realize the adaptation of the emergent direction in the backlight illumination module and the light path of the imaging device.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of backlighting, in particular to a backlighting module, an imaging device, a head-up display device and a vehicle. BACKGROUND

[0002] The backlighting module in the head-up display device of the automobile is usually used for illuminating image information containing instruments, navigation, etc., so that the image information can be projected to the vicinity of the driver's line of sight through an imaging light path, avoiding the driver from frequently looking down to watch the instrument panel while driving. The virtual image output from the imaging light path or system and projected to the windshield of the automobile also needs to have brightness uniformity to meet the brightness uniformity perceived by the human eye, avoiding glare, thereby ensuring the safety of driving.

[0003] To ensure clear imaging, the exit direction of the backlighting module needs to be highly matched with the imaging path of the display unit, such as the LCD (Liquid Crystal Display), which greatly limits the flexibility of the installation position of the head-up display device in the complex and compact space environment of the automobile. Specifically, the interior space of the automobile not only needs to accommodate large mechanical components such as engines and transmissions, but is also full of various electrical circuits and other electronic devices, leaving very limited space for the head-up display device. In this case, to find an installation position that meets the traditional light path matching requirements, it is often necessary to make substantial adjustments to the layout of other components, which undoubtedly increases the difficulty and cost of automobile design. In some extreme cases, it is even impossible to complete the position arrangement of the head-up display device, seriously hindering the wide application of the head-up display device in the automobile field.

[0004] In the process of implementing the present application, the inventors found that there have been attempts to add a mirror to realize light path turning, which provides a way to solve the space problem, but also has obvious defects. The installation of the mirror requires additional space, and when the exit direction of the backlighting module needs to be adjusted, the installation angle of the mirror needs to be adjusted as a whole, which further aggravates the space pressure in the originally space-stressed automobile interior. CONTENT OF THE UTILITY MODEL

[0005] The embodiment of the present application provides a backlighting module, an imaging device, a head-up display device and a vehicle.

[0006] According to an aspect of the embodiments of the present application, a backlight module is provided, comprising: a backlight source configured to output illumination light; a collimating and homogenizing lens arranged on the light exit side of the backlight source; and a deflection lens arranged on the light exit side of the collimating and homogenizing lens, the deflection lens comprising a substrate and a plurality of lens portions arranged on the light entrance side of the substrate, the lens portions having light entrance surfaces, and the light entrance surfaces of the lens portions being arranged obliquely relative to the substrate.

[0007] In an optional manner, the direction from the light entrance side of the deflection lens to the light exit side of the deflection lens is a first direction, a second direction is perpendicular to the first direction, and the plurality of lens portions are arranged on the substrate along the second direction.

[0008] In an optional manner, the oblique angles of the light entrance surfaces of the plurality of lens portions relative to the substrate are all the same.

[0009] In an optional manner, the deflection lens has two regions, the oblique angle of the light entrance surface of the lens portion located in one of the two regions relative to the substrate is a first angle, the oblique angle of the light entrance surface of the lens portion located in the other of the two regions relative to the substrate is a second angle, and the first angle is different from the second angle.

[0010] In an optional manner, the direction from the light entrance side of the deflection lens to the light exit side of the deflection lens is a first direction, a second direction is perpendicular to the first direction, and along the second direction, the deflection lens comprises a first portion, a second portion and a third portion arranged in sequence, the light entrance surface of the lens portion located in the first portion has a first oblique angle with the substrate, the light entrance surface of the lens portion located in the second portion has a second oblique angle with the substrate, and the light entrance surface of the lens portion located in the third portion has a third oblique angle with the substrate; the first oblique angle, the second oblique angle and the third oblique angle are all inconsistent with each other, or at least two of the first oblique angle, the second oblique angle and the third oblique angle are consistent with each other, or the first oblique angle and the third oblique angle are consistent with each other, and the second oblique angle and the first oblique angle are inconsistent with each other.

[0011] In an optional manner, the light entrance surface of the collimating and homogenizing lens is a collimating surface, the light exit surface of the collimating and homogenizing lens is a homogenizing surface, the collimating surface is composed of a plurality of collimating lenses, and the homogenizing surface is composed of a microlens array, wherein the microlens array is a microlens array composed of a plurality of concave microlenses or a microlens array composed of a plurality of convex microlenses.

[0012] According to an aspect of some embodiments of the present application, an imaging device is provided, comprising the backlight illumination module.

[0013] In an alternative manner, the display unit has a display area, and the projections of the light-in surfaces of the lens portions on the display unit are at least partially coincident with the display area after being deflected in a third direction, or the projections of the light-in surfaces of the lens portions on the display unit are larger than the display area after being deflected in the third direction, the third direction being the direction of the light rays after passing through the deflection lens.

[0014] According to an aspect of some embodiments of the present application, a head-up display device is provided, comprising the imaging device.

[0015] According to an aspect of some embodiments of the present application, a vehicle is provided, comprising the head-up display device.

[0016] Compared with the prior art, the present application has the following advantages: different from the prior art, the backlight illumination module, the imaging device, the head-up display device and the vehicle provided in the embodiments of the present application comprise a backlight source configured to output illumination light, a collimation and homogenization lens arranged on the light-out side of the backlight source, and a deflection lens arranged on the light-out side of the collimation and homogenization lens, the deflection lens comprising a base material and a plurality of lens portions arranged on the light-in side of the base material, the lens portions having light-in surfaces, and the light-in surfaces of the lens portions being arranged obliquely relative to the base material. The light path is designed into two stages of collimation and homogenization processing and subsequent deflection adjustment by the backlight illumination module. The collimation and homogenization lens performs collimation and homogenization processing, and the collimation and homogenization element can convert the light rays from the backlight source into parallel and uniformly distributed light beams, significantly improving the utilization efficiency of the light rays. This innovative design makes the spatial layout no longer limited by the traditional light path matching, and the installation position of the collimation and homogenization element can be flexibly selected according to the actual spatial conditions inside the vehicle, laying a foundation for subsequent light path adjustment, i.e. breaking the inherent mode that the light path of the backlight illumination module and the imaging device must be strictly matched from the beginning in the traditional backlight illumination module. In addition, the deflection lens performs deflection adjustment, so that the backlight illumination module and the imaging device can be adapted to each other. BRIEF DESCRIPTION OF DRAWINGS

[0017] The embodiments are illustrated by way of example in the drawings that are not intended to be limiting of the embodiments so far as they are in conformity with the principles of these embodiments. Similar elements are denoted by identical reference numerals throughout the various drawings. The drawings are not to scale.

[0018] Figure 1 is a structural schematic diagram of a backlight module applied to a display unit in the prior art;

[0019] Figure 2 is Figure 1 is a light path diagram of the structure shown in

[0020] Figure 3 is a structural schematic diagram of a backlight module applied to a display unit in the prior art;

[0021] Figure 4 is Figure 3 is a light path diagram of the structure shown in

[0022] Figure 5 is a structural schematic diagram of a backlight module provided by the embodiments of the present application;

[0023] Figure 6 is Figure 5 is a light path diagram of the structure shown in

[0024] Figure 7 is a schematic diagram of a collimating and homogenizing lens provided by the embodiments of the present application;

[0025] Figure 8 is a schematic diagram of one view of a deflection lens provided by the embodiments of the present application;

[0026] Figure 9 is a schematic diagram of another view of a deflection lens provided by the embodiments of the present application;

[0027] Figure 10 is a structural schematic diagram of an imaging device provided by the embodiments of the present application;

[0028] Figure 11 is Figure 10 is a light path diagram of the structure shown in

[0029] Figure 12 is a structural schematic diagram of a head-up display device provided by the embodiments of the present application.

[0030] Prior art shown in the figure: 10, backlight module; 1, collimating lens; 2, microlens array; 3, condensing lens, 4, reflector; 5, display unit;

[0031] In the figure, the present application: D1, first direction; D2, second direction; D3, third direction; 10, backlight module; 11, backlight source; 12, collimating and light-uniformity lens; 12a, collimating surface; 12a1, collimating lens; 12b, light-uniformity surface; 12b1, microlens array; 13, deflection lens; 131, base material; 132, lens part; 1321, light-in surface of lens part; 13a, first part; 13b, second part; 13c, third part; 13a1, first inclination angle; 13b1, second inclination angle; 13c1, third inclination angle; 14, diffusion element; 20, display unit; 21, display area; 100, imaging device; 1000, head-up display device. DETAILED DESCRIPTION

[0032] The present application will be described in detail below with specific embodiments. The following examples 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, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made. These are all within the scope of protection of the present application.

[0033] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0034] It should be noted that, if there is no conflict, each feature in the embodiments of the present application can be combined with each other, and all 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, it can be different from the module division in the device. In addition, the terms "first" and the like 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. It should be noted that the terms "horizontal", "left", "right" and the like used in the present specification are only for the purpose of illustration. In order to facilitate the structure limitation, the present application takes the transmission direction of the illumination light as the reference to limit the position of the components.

[0035] Unless otherwise defined, all technical and scientific terms used in the present specification have the same meaning as commonly understood by those skilled in the art to which the present application belongs. The terms used in the present specification are only for the purpose of describing the specific embodiments of the present application, and are not applicable to limit the present application. The term "and / or" used in the present specification includes any and all combinations of one or more related listed items.

[0036] Figure 1A structure diagram of a backlight module 10p in the prior art applied to a display unit 5 is shown, Figure 2 A structure diagram of a backlight module 10p in the prior art applied to a display unit 5 is shown, Figure 1 A light path diagram of the structure shown, in the prior art backlight module 10p, Figure 1 And Figure 2 To achieve the functions of collimation, uniformity, angle control / adjustment, light path deflection, etc. of the illumination light, corresponding optical elements need to be provided. Specifically, the backlight module 10p includes a collimating lens 1, a microlens array 2, and a condenser lens 3. The collimating lens 1 is provided to collimate the light, the microlens array 2 is provided to uniform the light, and the condenser lens 3 is provided to condense the light on the display unit 5. The exit direction of the backlight module 10p needs to be highly matched with the imaging path of the display unit 5, which greatly limits the flexibility of the installation position of the head-up display device in the complex and compact space environment of the car interior.

[0037] There is an improvement, please refer to Figure 3 , Figure 3 A structure diagram of another backlight module 10p in the prior art applied to a display unit 5 is shown, Figure 4 A structure diagram of another backlight module 10p in the prior art applied to a display unit 5 is shown, Figure 3 A light path diagram of the structure shown, in the prior art backlight module 10p, Figure 3 And Figure 4 The backlight module 10p includes a collimating lens 1, a microlens array 2, a condenser lens 3, and a mirror 4. The collimating lens 1 is provided to collimate the light, the microlens array 2 is provided to uniform the light, and the condenser lens 3 is provided to condense the light. The condensed light is reflected by the mirror 4 and projected on the display unit 5. Through the provision of the mirror 4, the light path is turned, which provides a way to solve the space problem, but also has obvious defects. The installation of the mirror 4 requires additional space, and when the exit direction of the backlight module 10p needs to be adjusted, the installation angle of the mirror 4 needs to be adjusted as a whole, which further aggravates the space pressure in the originally space-stressed car interior.

[0038] Embodiment one

[0039] To solve the above problems, the embodiments of the present application provide a backlight module, an imaging device, a head-up display device, and a vehicle, please refer to Figure 5 And Figure 6 , Figure 5 A structure diagram of a backlight module according to an embodiment of the present application is shown, Figure 6 A structure diagram of a backlight module according to an embodiment of the present application is shown, Figure 5 A light path diagram of the structure shown, the backlight module 10 includes a backlight source 11, a collimating and uniformity lens 12, a deflection lens 13, and a diffusion element 14.

[0040] It is worth mentioning that the diffusion element 14 can also not be arranged, and the function of the backlight illumination module 10 can also be realized.

[0041] The backlight source 11 is configured to output illumination light. In order to facilitate the reader to understand the design concept of the present application and for the convenience of description, the direction in which the backlight source 11 outputs the illumination light is defined as the first direction D1. Optionally, the backlight source 11 can be a light-emitting diode (LED) light source, and the number of the light-emitting diodes can be set according to the brightness requirement, color requirement, etc. of imaging. In other embodiments, the backlight source 11 can also be other illumination light sources such as electroluminescent (EL), cold cathode fluorescent lamp (CCFL), laser diode (LD), etc. The backlight source 11 can also be a specific classification of light-emitting diode light sources such as organic light-emitting diode OLED, inorganic light-emitting diode LED, active matrix organic light-emitting diode panel AMOLED, sub-millimeter light-emitting diode Mini LED, Micro LED, etc. The type and number of the backlight source 11 can be selected according to actual needs, and the present application is not limited to the embodiments. Figure 6 In the example shown, the first direction D1 is also the horizontal direction, that is, the overall transmission direction of the light path.

[0042] The collimating and uniform light lens 12 is arranged on the light output side of the backlight source 11 and is arranged in the first direction D1. When the collimating and uniform light lens 12 is used as an optical element, the collimating and uniform light lens 12 has both collimating and uniform light functions, which can effectively reduce the cost, reduce the optical surface, and improve the utilization efficiency of light energy compared with the scheme of using two optical elements to realize the two functions. Specifically, when the collimating and uniform light lens 12 is used as an optical element, Figure 5 and Figure 6 When the collimating and uniform light lens 12 is used as an optical element, the light input surface of the collimating and uniform light lens 12 is the collimating surface 12a, and the light output surface of the collimating and uniform light lens 12 is the uniform light surface 12b.

[0043] Optionally, the collimating surface 12a is composed of a plurality of collimating lenses 12a1, and the number of the collimating lenses 12a1 is the same as the number of the light-emitting diodes (backlight source 11). As an example, please refer to Figure 7The number of the collimating lens 12a1 is 16, and the number of the light-emitting diode (backlight 11) is set to 16 accordingly. Optionally, the light uniformization surface 12b is composed of a microlens array 12b1, wherein the microlens array 12b1 is composed of a plurality of concave microlenses or a plurality of convex microlenses. In other embodiments, the structure of the collimating surface 12a and / or the light uniformization surface 12b can be designed according to actual needs; the number, shape, arrangement mode, etc. of the collimating lens 12a1 and the light-emitting diode (backlight 11) can be selected according to actual needs; the structure design of the collimating and light uniformization lens 12 described above can be set according to actual needs, and does not need to be limited by the embodiments and the accompanying drawings of the present application.

[0044] The deflection lens 13 is arranged on the light exit side of the collimating and light uniformization lens 12, and the collimating and light uniformization lens 12 is arranged in the first direction D1. Please refer to Figure 5 and Figure 8 The deflection lens 13 includes a substrate 131 and a plurality of lens portions 132 arranged on the light entrance side of the substrate 131, and any one of the lens portions 132 is arranged on the light entrance side of the substrate 131 along the first direction D1. Any one of the lens portions 132 has a light entrance surface 1321, and the light entrance surface 1321 of the lens portion 132 is arranged obliquely relative to the substrate 131. The oblique angle of the light entrance surface 1321 of the lens portion 132 arranged obliquely relative to the substrate 131 can be set or selected according to the target exit direction of the backlight illumination module 10. When it is necessary to adjust the exit direction of the backlight illumination module 10, it is only necessary to adjust or select the oblique angle of the light entrance surface 1321 of the lens portion 132 of the deflection lens 13 arranged obliquely relative to the substrate 131, without the need to adjust the arrangement position and angle of the entire deflection lens 13, effectively solving the problems of space layout and light path adjustment in the prior art.

[0045] The light entrance side of the substrate 131 refers to the side of the substrate 131 facing the backlight 11, and the substrate 131 includes a flat plate and a curved surface, which are not limited herein.

[0046] In some embodiments, a plurality of the lens portions 132 are regularly arranged on the substrate 131 along a second direction D2, the plurality of the lens portions 132 form a sawtooth-like structure on the substrate 131, and the second direction D2 is perpendicular to the first direction D1. The first direction D1 is also the direction from the light-in side of the deflection lens 13 to the light-out side of the deflection lens 13. The second direction D2 can be any direction perpendicular to the first direction D1. Optionally, when the first direction D1 is the horizontal direction, the second direction D2 is the direction of gravity. Optionally, when the first direction D1 is the direction of gravity, the second direction D2 is the horizontal direction. It can be understood that the arrangement of the plurality of the lens portions 132 on the substrate 131 does not need to be limited to the embodiments of the drawings.

[0047] The light-in side of the deflection lens 13 refers to the side of the deflection lens 13 facing the backlight 11, and the light-out side of the deflection lens 13 refers to the side of the deflection lens 13 facing away from the backlight 11.

[0048] In some embodiments, the inclination angles of the light-in surfaces 1321 of the plurality of the lens portions 132 relative to the substrate 131 are all the same.

[0049] In some embodiments, the deflection lens 13 has two regions (not shown in the figure), the inclination angles of the light-in surfaces 1321 of the lens portions 132 in one of the regions relative to the substrate 131 are a first angle, the inclination angles of the light-in surfaces 1321 of the lens portions 132 in the other of the regions relative to the substrate 131 are a second angle, and the first angle is different from the second angle.

[0050] In some embodiments, please refer to Figure 9, along the second direction D2, the deflection lens 13 comprises a first portion 13a, a second portion 13b and a third portion 13c arranged in sequence, the first inclination angle 13a1 is provided between the light entrance surface 1321 of the lens portion 132 in the first portion 13a and the base material 131, the second inclination angle 13b1 is provided between the light entrance surface 1321 of the lens portion 132 in the second portion 13b and the base material 131, and the third inclination angle 13c1 is provided between the light entrance surface 1321 of the lens portion 132 in the third portion 13c and the base material 131; the first inclination angle 13a1, the second inclination angle 13b1 and the third inclination angle 13c1 are inconsistent with each other, or at least two of the first inclination angle 13a1, the second inclination angle 13b1 and the third inclination angle 13c1 are consistent with each other. For example, the first inclination angle 13a1 and the third inclination angle 13c1 are consistent with each other, and the second inclination angle 13b1 and the first inclination angle 13a1 are inconsistent with each other. Through the above arrangement, the deflection angles of the light rays by the different portions of the deflection lens 13 are the same or different, and the light output directions of the backlight illumination module 10 at the different portions of the deflection lens 13 are the same or different, so that the requirements of the imaging device can be better matched.

[0051] In some embodiments, along the second direction D2, the deflection lens 13 is divided into the first portion 13a, the second portion 13b and the third portion 13c, and a division mode of the first portion 13a, the second portion 13b and the third portion 13c is provided. It can be understood that the first portion 13a, the second portion 13b and the third portion 13c are not limited to the form of equal division.

[0052] The diffusion element 14 is arranged on the light output side of the deflection lens 13 and in the first direction D1, and is used for diffusing the illumination light beam. The illumination light diffused by the diffusion element 14 can be directly used for illuminating the display unit, and the illumination light is projected onto the display unit at a predetermined angle.

[0053] The backlight illumination module 10 provided by the embodiments of the present application works as shown in Figure 5 or Figure 6 When the backlight illumination module 10 works, the illumination light output by the backlight source 11 is first collimated by the collimating and uniform light lens 12, and then adjusted to be uniformly output by the uniform light surface 12b of the collimating and uniform light lens 12; then, the illumination light after the collimating and uniform light processing is deflected by the lens portion 132 of the deflection lens 13; finally, the illumination light is diffused and output by the diffusion element 14 to form an image.

[0054] The backlight module 10 provided by the embodiments of the present application has the advantages of Figure 1 Compared with the prior art shown in the figure, the collimating and light-uniformizing element 12 in the backlight module 10 breaks the inherent mode that the light path of the imaging device must be strictly matched with the exiting direction from the beginning in the conventional backlight module 10p. The deflection lens 13 can realize the adaptation of the light path of the imaging device to the exiting direction in the backlight module 10.

[0055] It is also important that when the exiting direction of the backlight module 10 needs to be adjusted, the mounting angle of the deflection lens 13 as a whole does not need to be adjusted, but only the inclination angle of the light-in surface 1321 of the lens part 132 relative to the base material 131 needs to be selected to change the exiting direction of the backlight module 10, effectively solving the problems of spatial layout and light path adjustment in the prior art. This means that when various vehicle designs are dealt with, the angle of the light path of the imaging device caused by structural differences or special light path configurations caused by specific functional requirements can be ensured by customizing the deflection lens 13 (the inclination angle of the light-in surface 1321 of the lens part 132 relative to the base material 131) to realize the accurate matching of the exiting light of the backlight module 10 to the light path of the imaging device in various complex design conditions, greatly widening the applicability of the backlight module 10 provided by the present application in different automotive product designs and helping automobile manufacturers to more efficiently integrate the head-up display device including the backlight module 10 provided by the present application into diversified vehicle platforms.

[0056] In addition, the backlight module 10 provided by the present application has the advantage of small size. Since it is not necessary to ensure that the exiting direction is consistent with the light path of the imaging device at the initial stage, the dependence on complex and bulky light path calibration structures is reduced. In addition, the combined layout of the collimating and light-uniformizing element and the deflection lens 13 is more compact and reasonable, greatly reducing the size of the entire backlight module 10. More available space is saved in the automobile interior, facilitating the installation and layout optimization of other devices.

[0057] In addition, the light efficiency of the backlight module 10 provided by the present application is improved, and the heat dissipation is optimized. The collimating and light-uniformizing element plays a key role in greatly improving the light utilization efficiency and reducing the high-brightness backlight demand caused by light loss, thereby relieving the heat dissipation pressure from the source. At the same time, the overall light path layout is more scientific and reasonable, effectively improving the overall light efficiency of the head-up display device and reducing the energy consumption. The long-term stable operation of the system is guaranteed, the aging speed of the components is slowed down, and the service life is significantly prolonged.

[0058] Embodiment Two

[0059] The embodiments of the present application provide an imaging device, please refer to Figure 10Fig. 1 shows a structure of an imaging device according to an embodiment of the present application, Figure 11 Fig. 1 shows a structure of an imaging device according to an embodiment of the present application, Figure 10 Fig. 1 shows a structure of an imaging device according to an embodiment of the present application,

[0060] The backlight illumination module 10 is the backlight illumination module 10 as described in Embodiment One. Specifically, the structure of the backlight illumination module 10 and the imaging principle, the imaging light path, etc. can be referred to Embodiment One and the drawings shown therein, which will not be described in detail here.

[0061] The display unit 20 is arranged on the light exit side of the backlight illumination module 10 and is configured to receive the illumination light emitted by the backlight illumination module 10 and generate a virtual image. The virtual image can be a color image or a black-and-white image. The color of the illumination light output by the backlight illumination module 10 and / or the type of the display unit 20 can be set according to actual needs. For example, the display unit 20 can be a liquid crystal display (LCD). After the illumination light output by the backlight illumination module 10 is projected onto the display unit 20, an image light beam is generated, and the image light beam is imaged on an imaging medium. Specifically, the size of the liquid crystal display includes 3.62 inches, and when the target FOV of the head-up display device is 10°*4°, the resolution of the LCD is 1000*400.

[0062] In some embodiments, the display unit 20 has a display area 21. Along the first direction D1, the projection of the light entrance surface 1321 of the lens portion 132 on the display unit 20 is deflected along a third direction D3 and at least partially overlaps the display area 21, or the projection of the light entrance surface 1321 of the lens portion 132 on the display unit 20 is deflected along the third direction D3 and is larger than the display area 21. The third direction D3 is the exit direction of the light after being deflected by the deflection lens 13. The display area 21 is the effective display area of the display unit 20, and only needs to ensure that the light exiting the deflection lens 13 can enter the display area 21. Preferably, the projection of the light entrance surface 1321 of the lens portion 132 on the display unit 20 along the first direction D1 is deflected along the third direction D3 and completely overlaps the display area 21.

[0063] In addition, when the projection of the light entrance surface 1321 of the lens portion 132 on the display unit 20 is deflected along the third direction D3 and overlaps the display area 21, only the light entrance surface 1321 of the lens portion 132 needs to be arranged at a position corresponding to the display area 21, thereby saving the size requirement of the deflection lens 13 and improving the flexibility of space arrangement.

[0064] In addition, if the projection of the light entrance surface 1321 of the lens portion 132 on the display unit 20 is deflected along the third direction D3 and is greater than the display area 21, it means that the projection of the light entrance surface 1321 of the lens portion 132 on the display unit 20 is deflected along the third direction D3 and not only completely covers the display area 21 but also exceeds the range where the display area 21 is located, thereby ensuring that the light emitted from the deflection lens 13 enters the range of the display area 21.

[0065] Embodiment three

[0066] An embodiment of the present application provides a head-up display device, please refer to Figure 12 which shows the structure of a head-up display device provided by an embodiment of the present application, the head-up display device 1000 comprises the imaging device 100 as described in embodiment two.

[0067] Specifically, the structure and imaging principle of the imaging device 100, imaging light path and the like please refer to embodiment one, embodiment two and the drawings shown in the embodiment, which will not be described here in detail.

[0068] Generally, the head-up display device 1000 is usually a head-up display device (Head Up Display, HUD) in a car or an airplane, also known as a head-up display system, which usually uses a windshield that can be observed by human eyes as an imaging medium, therefore, the image beam output by the imaging device 100 can be imaged on the windshield of the head-up display device 1000.

[0069] Embodiment four

[0070] An embodiment of the present application provides a vehicle, the vehicle comprising the head-up display device as shown in embodiment three.

[0071] Among them, the vehicle can be a car, an airplane, a ship and the like, which has a windshield. By integrating the head-up display device provided by the embodiment of the present application in the vehicle, the driver can view the navigation information, the vehicle speed, the fuel quantity and the like without lowering the head, thereby improving the driving safety and the driving experience.

[0072] It should be noted that the device embodiments described above are only schematic and the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. According to the actual needs, part or all of the modules can be selected to achieve the purpose of the embodiment scheme.

[0073] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; under the idea of the present application, the technical features in the above examples or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in details 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 backlight module, characterized in that, The backlight module comprises: a backlight source configured to output illumination light; a collimating and homogenizing lens arranged on the light exit side of the backlight source; a deflection lens arranged on the light exit side of the collimating and homogenizing lens, the deflection lens comprising a substrate and a plurality of lens portions arranged on the light entrance side of the substrate, the lens portions having light entrance surfaces, and the light entrance surfaces of the lens portions being arranged obliquely relative to the substrate.

2. The backlight module of claim 1, wherein, The direction from the light entrance side of the deflection lens to the light exit side of the deflection lens is a first direction, and a second direction is perpendicular to the first direction, and the plurality of lens portions are arranged along the second direction on the substrate.

3. The backlight module of claim 1, wherein, The oblique angles of the light entrance surfaces of the plurality of lens portions relative to the substrate are all the same.

4. The backlight module of claim 1, wherein, The deflection lens has two regions, the oblique angle of the light entrance surface of the lens portion located in one of the two regions relative to the substrate is a first angle, and the oblique angle of the light entrance surface of the lens portion located in the other of the two regions relative to the substrate is a second angle, and the first angle is different from the second angle.

5. The backlight module of claim 1, wherein, The direction from the light entrance side of the deflection lens to the light exit side of the deflection lens is a first direction, and a second direction is perpendicular to the first direction, and along the second direction, the deflection lens comprises a first portion, a second portion and a third portion arranged in sequence, the light entrance surface of the lens portion located in the first portion has a first oblique angle between the light entrance surface and the substrate, the light entrance surface of the lens portion located in the second portion has a second oblique angle between the light entrance surface and the substrate, and the light entrance surface of the lens portion located in the third portion has a third oblique angle between the light entrance surface and the substrate. The first oblique angle, the second oblique angle and the third oblique angle are all inconsistent, or at least two of the first oblique angle, the second oblique angle and the third oblique angle are consistent.

6. The backlight module according to claim 1, wherein: the light entrance surface of the collimating and homogenizing lens is a collimating surface, and the light exit surface of the collimating and homogenizing lens is a homogenizing surface; the collimating surface is composed of a plurality of collimating lenses; the homogenizing surface is composed of a microlens array, wherein the microlens array is a microlens array composed of a plurality of concave microlenses or a microlens array composed of a plurality of convex microlenses.

7. An image forming apparatus characterized by comprising: The backlight module according to any one of claims 1-6; a display unit arranged on the light exit side of the backlight module and configured to receive the illumination light emitted by the backlight module and generate a virtual image. The display unit has a display region, and along the direction from the light entrance side of the deflection lens to the light exit side of the deflection lens, the projection of the light entrance surfaces of the plurality of lens portions on the display unit is deflected along a third direction and at least partially overlaps with the display region, or the projection of the light entrance surfaces of the plurality of lens portions on the display unit is deflected along the third direction and is larger than the display region, and the third direction is the exit direction of light after passing through the deflection lens.

8. The imaging apparatus according to claim 7, wherein The imaging device according to claim 7 or 8.

9. A head-up display device, characterized by The head-up display device according to claim 9. ​ 10. A vehicle, characterized by ​ ​

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