Backlight module, display device and vehicle

Abstract

The utility model discloses embodiment relates to the technical field of backlight module, especially disclose a kind of backlight module, display device and vehicle, including light source, total internal reflection lens and light adjusting assembly, light source is used to provide illumination light, total internal reflection lens is set to the light emitting side of light source to make the light spot formed by the illumination light provided by light source present oval, light adjusting assembly is set to the light emitting end of total internal reflection lens, light adjusting assembly is used to adjust at least one attribute in the space intensity uniformity, angle distribution or propagation direction of beam passing.Through the above-mentioned mode, the lens commonly used in prior art can be replaced by using total internal reflection lens, so that the light spot displayed by backlight module presents oval, more adaptation actual image display, only single-row backlight module can realize the display effect of double-layer structure used in prior art, simplify the volume of display device of backlight module with the application, reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of backlight module technology, and in particular to a backlight module, display device and vehicle. Background Technology

[0002] The backlighting components in a car's head-up display (HUD) are typically used to illuminate images containing instrument panel and navigation information, allowing these images to be projected onto the driver's line of sight via the imaging optical path, thus avoiding the need for the driver to frequently look down at the instrument panel. Furthermore, the virtual image projected onto the windshield from the imaging optical path or components must possess brightness uniformity that matches the level of brightness perceived by the human eye to prevent glare and ensure driving safety.

[0003] In the process of developing this application, the inventors discovered that: Currently, head-up displays include a display unit (PGU) that emits image light for imaging. The display unit (PGU) includes a backlight module and a display unit. The backlight module outputs illumination light to light up the display components. The backlight module mainly includes a light source, a lens, and various dimming elements. The illumination light emitted by the light source is adjusted by the lens and emitted in a specified direction. Then, it passes through multiple optical elements to collimate, homogenize, and adjust the angle of the illumination light. Since the imaging display area in a car head-up display is rectangular, it is necessary to ensure that the imaging light area emitted by the image generation unit is rectangular. Therefore, the backlight module usually adopts the method of arranging two sets of light sources side by side along the width direction of the display components, and then arranging multiple sets of light sources side by side along the length direction of the display components, so that the light spot projected by the illuminated display components is roughly rectangular. This structure makes the head-up display bulky and expensive. Utility Model Content

[0004] This utility model provides a backlight module, which mainly solves the technical problem that existing backlight modules, in order to adapt to actual display needs, usually need to set two rows of light sources and circular lenses, resulting in a bulky overall size and high manufacturing cost of the backlight module.

[0005] To solve the above-mentioned technical problems, the present invention provides a backlight module comprising: a light source, a total internal reflection lens, and a dimming component. The light source is used to provide illumination light. The total internal reflection lens is disposed on the light-emitting side of the light source so that the light spot formed by the illumination light provided by the light source is elliptical. The dimming component is disposed on the light-emitting end of the total internal reflection lens and is used to adjust at least one of the following attributes: spatial intensity uniformity, angular distribution, or propagation direction of the light beam.

[0006] Optionally, the total internal reflection lens is provided with a focusing groove, and the light source is at least partially housed in the focusing groove. The focusing groove includes a first sidewall surrounding the light source and a first bottom wall corresponding to the light source. The first sidewall allows the illumination light to pass through and be refracted, and the first bottom wall allows the illumination light to pass through. The total internal reflection lens also includes a reflective wall surface surrounding the focusing groove and connected to the first sidewall, and a light-emitting surface corresponding to the first bottom wall and connected to the reflective wall surface.

[0007] Optionally, the reflective wall surface is a total reflection surface, which is used to totally reflect the illumination light refracted to the total reflection surface so that the illumination light is emitted through the light-emitting surface.

[0008] Optionally, the total internal reflection lens includes a long axis end and a short axis end, the orientation of the long axis end is consistent with the width direction of the backlight module, and the orientation of the short axis end is consistent with the length direction of the backlight module.

[0009] Optionally, the dimming assembly includes a light-diffusing element and a light-diffusing element, wherein the light-diffusing element is disposed on the light-emitting surface of the total internal reflection lens, and the light-diffusing element is disposed on the light-emitting side of the light-diffusing element.

[0010] Optionally, the light-diffusing element is integrally formed with the total internal reflection lens.

[0011] Optionally, the dimming assembly further includes a deflection element disposed between the light-diffusing element and the light-diffusing element, the deflection element being used to adjust the emission direction of the illumination light after it has been homogenized by the light-diffusing element.

[0012] Optionally, the deflecting element is a deflecting prism and a diverging lens, or the deflecting element is a deflecting lens provided with a plurality of lens portions.

[0013] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is to provide a display device, including the above-mentioned backlight module and display unit, wherein the display unit is disposed on the light-emitting side of the backlight module.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is to provide a means of transportation, including the above-mentioned backlight module and / or the above-mentioned display device.

[0015] The beneficial effects of this utility model embodiment are as follows: Unlike existing technologies, this utility model embodiment provides a backlight module, display device, and vehicle, including a light source, a total internal reflection lens, and a dimming component. The light source provides illumination light. The total internal reflection lens is disposed on the light-emitting side of the light source so that the light spot formed by the illumination light provided by the light source is elliptical. The dimming component is disposed at the light-emitting end of the total internal reflection lens, and the dimming component is used to adjust at least one attribute of the light beam, including spatial intensity uniformity, angular distribution, or propagation direction. Through the above structure, this utility model embodiment can replace the lenses commonly used in the prior art with total internal reflection lenses, thereby making the light spot displayed by the backlight module elliptical, which is more suitable for actual screen display. Only a single row of dimming components is needed to achieve the display effect of the double-layer structure used in the prior art, simplifying the size of the display device using this backlight module and reducing production costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a backlight module from one perspective, provided in an embodiment of this utility model;

[0018] Figure 2 This is a structural schematic diagram of a backlight module provided in another embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional view of two perpendicular directions of a total internal reflection lens of a backlight module provided in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the optical path at the short axis end of the total internal reflection lens of a backlight module provided in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram of the optical path at the long axis end of the total internal reflection lens of a backlight module provided in an embodiment of this utility model;

[0022] Figure 6 These are schematic diagrams of light spots projected by multiple backlight modules in the prior art provided by the embodiments of this utility model, and schematic diagrams of light spots projected by multiple backlight modules with total internal reflection lenses in this application.

[0023] Figure 7This is a schematic diagram of another backlight module provided in this embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the optical path of multiple backlight modules provided in an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of a display device using the backlight module of this application, provided by an embodiment of the present invention.

[0026] Icon labels:

[0027] 100. Backlight module;

[0028] 1. Light source; 11. Light-emitting side;

[0029] 2. Total internal reflection lens; 21. Condenser groove; 211. First sidewall; 212. First bottom wall; 213. Reflecting wall surface; 214. Light emitting surface; 22. Long axis end; 23. Short axis end;

[0030] 3. Dimming assembly; 31. Light-diffusing element; 32. Diffusing element;

[0031] 33. Deflecting element; 331. Deflecting prism; 332. Diverging lens; 333. Deflecting lens;

[0032] X: First direction; Y: Second direction; Z: Third direction; S: Dark area;

[0033] 200. Display device; 201. Display unit. Detailed Implementation

[0034] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0036] This application provides a backlight module 100; please refer to [link / reference]. Figure 1 and Figure 2 The backlight module 100 includes: a light source 1, a total internal reflection lens 2, and a dimming component 3. The light source 1 is used to provide illumination light. The total internal reflection lens 2 is disposed on the light-emitting side 11 of the light source 1 so that the light spot formed by the illumination light provided by the light source 1 is elliptical. The dimming component 3 is disposed on the light-emitting end of the total internal reflection lens 2. The dimming component 3 is used to adjust at least one of the following attributes of the light beam (a light beam composed of several illumination light rays): spatial intensity uniformity, angular distribution, or propagation direction. Through the above structure, the elliptical light spot formed by the backlight module 100 of this application is larger than the circular light spot formed by the backlight module 100 with circular lenses used in the prior art due to the arrangement of the total internal reflection lens 2. Specifically, the outer contour of the display area of ​​the existing head-up display is generally rectangular or quasi-rectangular. Such rectangular or quasi-rectangular display areas generally have a difference in length and width. In order to ensure the display effect of the display area in the width direction, a double-row backlight module is usually arranged. The elliptical shape naturally has a major axis end 22 and a minor axis end 23, so that the elliptical light spot projected by the backlight module 100 with the total internal reflection lens 2 can cover the display area of ​​the display unit. Compared with the backlight module 100 with circular lenses, which is arranged in two rows to adapt to the display unit, this application can simplify the structure of the display device 200 using the backlight module 100, reduce the volume of the display device 200 using the backlight module 100 of this application, and reduce the production cost.

[0037] It should be noted that although some existing backlight modules 100 use rectangular lenses to make the projected light spot rectangular, the light rays at the four corners of the rectangular light spot have extremely large incident angles (close to 90°) when propagating from the center of the lens to the corners. When the light rays are incident on the corner edges at angles exceeding the critical angle (such as about 42° at the glass / air interface), total internal reflection (TIR) ​​occurs, and the light rays are refracted back into the lens instead of being emitted. This results in a significant reduction in the actual light rays emitted from the four corners of the rectangular lens, forming dark areas on the rectangular light spot.

[0038] For ease of understanding and description, the direction of the short axis end 23 is defined as the first direction X, which represents the length direction of the display area, the length direction of the backlight module 100, and the length direction of the display unit; the direction of the long axis end 22 is defined as the second direction Y, which represents the width direction of the display area, the width direction of the backlight module 100, and the width direction of the display unit; the direction of the light source 1 emitted from the total internal reflection lens 2 is defined as the third direction Z. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0039] In some embodiments, please refer to Figure 3 The total internal reflection lens 2 is provided with a focusing groove 21, and the light source 1 is at least partially housed within the focusing groove 21. The focusing groove 21 includes a first sidewall 211 surrounding the light source 1 and a first bottom wall 212 corresponding to the light source 1. The first sidewall 211 allows the illumination light to pass through and be refracted, and the first bottom wall 212 allows the illumination light to pass through. The total internal reflection lens 2 also includes a reflective wall surface 213 surrounding the focusing groove 21 and connected to the first sidewall 211, and a light-emitting surface 214 corresponding to the first bottom wall 212 and connected to the reflective wall surface 213. The light-emitting surface is elliptical. The reflective wall surface 213 is a total internal reflection surface, which is used to perform total internal reflection of the illumination light refracted to it, so that all the illumination light passes through the light-emitting surface 214 and exits. The first sidewall 211, the reflective wall 213, and the first bottom wall 212 work together to generate an elliptical light spot from the light source 1. The first sidewall 211 and the reflective wall 213 also collimate the light emitted by the light source 1, thereby collecting and initially collimating the divergent light emitted by the light source 1.

[0040] It should be noted that, in order to ensure that the illumination light provided by the light source forms an elliptical spot after passing through the total internal reflection lens 2, the total internal reflection lens 2 adopts an asymmetrical optical design in the major axis direction (second direction Y) and the minor axis direction (first direction X). Specifically, the reflective wall surface 213 has different tilt angles or curvature distributions in the first direction X and the second direction Y, so that the reflection deflection angle of the illumination light in the major axis direction (second direction Y) is smaller than that in the minor axis direction (first direction X). The elliptical contour of the light-emitting surface 214 works in conjunction with the internal reflective wall surface 213 to further control the difference in beam divergence angle between the first direction X and the second direction Y. As a result, the illumination light has a larger divergence angle in the major axis direction (Y), forming the major axis of the light spot; and a smaller divergence angle in the minor axis direction (X), forming the minor axis of the light spot, ultimately projecting an elliptical light spot that fits the rectangular display area.

[0041] Understandably, to ensure the compact size of the backlight module 100, the light source 1 and the total internal reflection lens 2 are arranged along the third direction. This arrangement ensures that the light spot projected from the light-emitting surface of the total internal reflection lens 2 is elliptical. Of course, the total internal reflection lens 2 can also project a quasi-elliptical light spot if it is tilted along the third direction. For example, in some irregularly shaped installation spaces, the total internal reflection lens 2 needs to be tilted along the third direction. After the total internal reflection lens 2 is tilted, it will cause local distortion of the elliptical light spot. The light spot can be adjusted by changing the local tilt angle or curvature of the reflective wall 213, or by using the dimming component 3. Examples will not be given here.

[0042] To facilitate understanding, the path of the illumination light emitted by light source 1 is explained here. Please refer to... Figure 4 and Figure 5 In a preferred embodiment, the light source 1 is completely housed within the focusing groove 21 to ensure that all the illumination light emitted by the light source 1 passes through the total internal reflection lens 2, reducing the waste of illumination light emitted by the light source 1. A portion of the illumination light emitted by the light source 1 (this portion refers to the illumination light excluding the central area corresponding to the first bottom wall 212) is refracted after passing through the first side wall 211 (a refraction phenomenon caused by the change in the transmission medium of the illumination light from air to the lens), and then, after passing through the total internal reflection surface, the illumination light is projected onto the dimming assembly 3 from the light-emitting surface 214 at a preset angle. The other portion of the illumination light from the light source 1 (this portion refers to the illumination light corresponding to the first bottom wall 212) is projected onto the dimming assembly 3 after passing through the first bottom wall 212 and the light-emitting surface 214 in sequence.

[0043] It is understood that the total internal reflection lens 2 includes a long axis end 22 and a short axis end 23, therefore, as Figure 3 , Figure 4 and Figure 5 As shown, the illumination light emitted by the light source 1, after being refracted and reflected by the total internal reflection lens 2, has different angles at the major axis end 22 and the minor axis end 23 of the elliptical lens. Specifically, the illumination light emitted by the light source 1 at the major axis end 22 will be at a linear tilt angle, while the illumination light emitted by the light source 1 at the minor axis end 23 will be emitted in a parallel state.

[0044] It should be noted that the ratio of the short axis end 23 to the long axis end 22 is including but not limited to: 1:1.2, 1:1.5, 1:1.8, 1:2, etc. The ratio of the short axis end 23 to the long axis end 22 is selected according to the actual display area requirements, and will not be listed here.

[0045] In some embodiments, the orientation of the long axis end 22 is consistent with the width direction of the backlight module 100, and the orientation of the short axis end 23 is consistent with the length direction of the backlight module 100. For ease of understanding, the application of the backlight module 100 in an actual display device 200 will be described; please refer to [link to relevant documentation]. Figure 6 In order to adapt to the width of the display unit, the existing backlight module 100 using circular lenses adopts a method of setting two rows of light sources 1 along the second direction Y. Accordingly, the light spot generated by the backlight module 100 using circular lenses in this distribution method is circular, and a dark area is formed between the two circular light spots along the second direction Y, which affects the actual display effect and causes a significant difference in brightness between the central area and the surrounding area of ​​the formed image. However, the backlight module 100 of this application, which is equipped with a total internal reflection lens 2, generates an elliptical light spot. Therefore, compared with a circular lens with the same minor axis length as the total internal reflection lens 2 (i.e., the first direction X), the elliptical light spot can illuminate a larger area than a circular light spot. The elliptical light spot is more suitable for the display area of ​​the display unit. Compared with a circular light spot, the elliptical light spot can avoid the existence of dark areas in the image display, thereby improving the display effect of the display device 200 using the backlight module 100. Furthermore, since the elliptical light spot eliminates the presence of dark areas in the center of the image compared to the circular light spot, the display device 200 using the backlight module 100 with the total internal reflection lens 2 of this application can reduce the amount of light source 1 used, improve the contrast between the area corresponding to the light spot and the surrounding area, and further enhance the display effect.

[0046] Referring to the figure, the dimming component 3 includes a light-diffusing element 31 and a light-diffusing element 32. The light-diffusing element 31 is disposed on the light-emitting surface 214 of the total internal reflection lens 2, and the light-diffusing element 32 is disposed on the light-emitting side 11 of the light-diffusing element 31. The light-diffusing element 31 is used to homogenize the illumination light projected by the total internal reflection lens 2 to improve the spatial intensity uniformity of the illumination light. The light-diffusing element 32 is used to homogenize the illumination light after it has been processed by the light-diffusing element 31 in terms of angle and / or eliminate the undesirable visual effects caused by coherence.

[0047] It is understandable that the light-diffusing element 31 may be disposed on the light-emitting surface 214 of the total internal reflection lens 2 in ways including but not limited to: direct bonding with optical adhesive, UV curing adhesive or other transparent adhesive, installation and fixation with an integrated bracket or base, or integral processing and molding.

[0048] In some embodiments, the light-diffusing element 31 and the total internal reflection lens 2 are integrally formed to improve the stability of the backlight module 100 during actual use and reduce the unexpected relative displacement between the light-diffusing element 31 and the total internal reflection lens 2 when the backlight module 100 is applied to the device, thereby affecting the actual projection effect of the lighting light.

[0049] In other embodiments, the dimming assembly 3 includes a bracket (not shown) with a through slot. The through slot includes a first opening and a second opening. The total internal reflection lens 2 extends into the through slot from the first opening and abuts against the side wall of the through slot, thereby limiting the movement of the total internal reflection lens 2. A first step is provided around the periphery of the second opening. The light-diffusing element 31 is disposed on the bracket and abuts against the first step, so that the light-emitting surface 214 of the total internal reflection lens 2 can be completely covered by the light-diffusing element 31, thereby ensuring that the illumination light emitted by the total internal reflection lens 2 can be homogenized by the light-diffusing element 31. This split-type arrangement allows either the total internal reflection lens 2 or the light-diffusing element 31 to be replaced if either is damaged. Compared to an integrated total internal reflection lens 2 and light-diffusing element 31, the split-type arrangement has a lower replacement cost.

[0050] In some embodiments, please refer to the figures and Figure 8 The dimming assembly 3 further includes a deflection element 33, which is disposed between the light-diffusing element 31 and the diffuser element 32. The deflection element 33 is used to adjust the emission direction of the illumination light after it has been homogenized by the light-diffusing element, so that the illumination light emitted by the light source 1 can be emitted in the preset direction of the deflection element 33 after being collimated by the total internal reflection lens 2 and homogenized by the light-diffusing element 31.

[0051] It is understood that the deflection structure of the illumination light achieved by the deflection element 33 includes, but is not limited to: a deflection prism 331 and a diverging lens 332, or the deflection element 33 is a deflection lens 333 provided with a plurality of lens portions.

[0052] Please refer to Figure 7When the deflecting element 33 consists of a deflecting prism 331 and a diverging lens 332, the total internal reflection lens 2, the light-diffusing element 31, the diverging lens 332, and the deflecting prism 331 are sequentially arranged along the direction in which the illumination light is projected through the light-emitting surface 214 of the total internal reflection lens 2. The deflecting prism 331 deflects the light path so that the illumination light reaches the display unit 201 at a predetermined angle. The diverging lens 332 adjusts the divergence angles of the illumination light beam in the horizontal and vertical directions to meet observation requirements and optimize light energy distribution to suit the system's optical design. Of course, the positions of the deflecting prism 331 and the diverging lens 332 can be interchanged, allowing the illumination light emitted by the light source 1 to pass sequentially through the total internal reflection lens 2, the deflecting prism 331, and the diverging lens 332.

[0053] When the deflecting element 33 is a deflecting lens 333 provided with a plurality of lens portions, please refer to Figure 8 The deflection element 33 includes a substrate (not shown) and a plurality of lens portions (not shown) disposed on the light-incident side of the substrate. The plurality of lens portions are disposed on the light-incident side of the substrate along a third direction Z to ensure that the deflection element 33 realizes the function of deflecting the illumination light received along the third direction Z. The light-incident surfaces of the plurality of lens portions are inclined relative to the substrate. The inclination angle of the light-incident surfaces of the plurality of lens portions relative to the substrate is selected according to actual needs and will not be described one by one. Alternatively, the deflection element 33 can be a deflection-diffusing prism. The deflection of the illumination light emitted from the light-exiting surface 214 of the total internal reflection lens 2 is achieved by relying on the special prism structure of the deflection-diffusing prism. The light-exiting surface 214 of the deflection-diffusing prism needs to be provided with a diffusion surface to achieve the deflection of the illumination light.

[0054] Furthermore, when using the deflecting lens 333, since the illumination light emitted from both sides of the total internal reflection lens 2 in the second direction Y has an angle, the deflection direction of several lens parts needs to be distinguished according to the actual corresponding part of the total internal reflection lens 2 in order to ensure the actual display effect of the backlight module 100.

[0055] This application provides an embodiment of a display device 200. Please refer to [link / reference]. Figure 8 The display device 200 includes a display unit 201 and a backlight module 100. The backlight module 100 includes multiple sets of light sources 1 along a first direction X and forms a single row of light sources 1 along a second direction Y. The display unit 201 is disposed on the light-emitting side 11 of the backlight module 100. The display unit 201 is used to receive the illumination light emitted by the backlight module 100 and generate an image. The image can be a color image or a black and white image. Specifically, the color of the illumination light output by the backlight module 100 and / or the type of the display unit 201 can be set according to actual needs.

[0056] Specifically, the display unit 201 is bonded to the diffusion element 32, which typically uses a diffusion film. The display device 200 includes LCD displays, head-up displays, light field screens, AR displays, VR displays, etc. When the display device 200 is an LCD display, it can be used as an image source in a head-up display to form panoramic head-up displays, augmented reality head-up displays, windshield-type head-up displays, etc. When the display device 200 is a head-up display, it also includes an image adjustment element, which includes optical lenses such as plane mirrors, curved mirrors, and lenses. The light emitted by the backlight module 100 illuminates the display unit 201, and the display unit 201 emits image light. The image adjustment element adjusts the image light emitted by the display unit 201 to ultimately form a virtual image.

[0057] Furthermore, when several backlight modules 100 are arranged side by side along the first direction X, since the elliptical light spots have a near-straight section in the second direction Y (the radius of curvature near the two ends of the major axis is very large, visually close to "relatively straight"), adjacent two elliptical light spots can be spliced ​​more closely and smoothly in this area, significantly reducing the dark seams at the splicing. Therefore, when several backlight modules 100 are spliced ​​along the first direction X, there will be no gap between adjacent two backlight modules 100 as seen between the circular light spots generated by two adjacent adjacent backlight modules 100 using circular lenses along the first direction X. This ensures that the display device 200 will not have dark areas in the actual imaging effect, thus improving the display effect.

[0058] When the backlight module 100 with total internal reflection lens 2 of this application provides backlight for the display device 200, the number of backlight modules 100 required for the display device 200 to achieve the desired display effect is less than that of the existing display devices 200, thereby making the display device 200 with the backlight module 100 with total internal reflection lens 2 of this application smaller in size.

[0059] It should be noted that for the specific structure and function of the backlight module 100, please refer to the above embodiments, which will not be described in detail here.

[0060] This application also provides an embodiment of a vehicle, which includes the above-described display device 200 and / or the above-described backlight module 100. For details on the specific structure and function of the display device 200 or the backlight module 100, please refer to the above embodiments, which will not be described in detail here.

[0061] Understandably, transportation means include, but are not limited to, cars and airplanes. Specific application scenarios include, for example, head-up displays (HUDs), also known as head-up display systems. These typically use the windshield, which is normally visible to the human eye, as the imaging medium. The image beam output by the display device 200 can be imaged on the windshield. A head-up display using the backlight module 100 of this application can output a uniformly bright image beam, thereby producing a uniformly bright virtual image on the windshield.

[0062] This application provides a backlight module 100, a display device 200, and a vehicle. The backlight module 100 includes a light source 1, a total internal reflection lens 2, and a dimming component 3. The total internal reflection lens 2 is disposed on the light-emitting side 11 of the light source 1 so that the light spot formed by the illumination light provided by the light source 1 is elliptical. This allows the backlight module 100 to adapt to the existing display requirements of text and patterns, effectively reducing the size of the display device 200 using the backlight module 100, and further reducing the space required in the vehicle using the display device 200. Compared with the backlight module 100 using a circular lens in the prior art, the display device 200 using the total internal reflection lens 2 of this application requires fewer backlight modules 100, effectively reducing production costs.

[0063] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A backlight module, characterized in that, include: A light source, which is used to provide illumination; A total internal reflection lens is disposed on the light-emitting side of the light source. The light-emitting surface of the total internal reflection lens is elliptical, so that the light spot formed by the illumination light provided by the light source is elliptical. A dimming component is disposed at the light-emitting end of the total internal reflection lens, and the dimming component is used to adjust at least one of the following attributes of the light beam: spatial intensity uniformity, angular distribution, or propagation direction.

2. The backlight module according to claim 1, characterized in that, The total internal reflection lens is provided with a focusing groove, and the light source is at least partially housed in the focusing groove. The focusing groove includes a first sidewall surrounding the light source and a first bottom wall corresponding to the light source. The first sidewall allows the illumination light to pass through and be refracted, and the first bottom wall allows the illumination light to pass through. The total internal reflection lens further includes a reflective wall surface surrounding the focusing groove and connected to the first sidewall, and a light-emitting surface corresponding to and connected to the reflective wall surface.

3. The backlight module according to claim 2, characterized in that, The reflective wall is a total reflection surface, which is used to reflect the illumination light refracted to the total reflection surface so that the illumination light is emitted through the light-emitting surface.

4. The backlight module according to claim 2, characterized in that, The total internal reflection lens includes a long axis end and a short axis end. The orientation of the long axis end is consistent with the width direction of the backlight module, and the orientation of the short axis end is consistent with the length direction of the backlight module.

5. The backlight module according to claim 1, characterized in that, The dimming assembly includes a light-diffusing element and a light-diffusing element. The light-diffusing element is disposed on the light-emitting surface of the total internal reflection lens, and the light-diffusing element is disposed on the light-emitting side of the light-diffusing element.

6. The backlight module according to claim 5, characterized in that, The light-diffusing element is integrally formed with the total internal reflection lens.

7. The backlight module according to claim 5, characterized in that, The dimming assembly also includes a deflection element, which is disposed between the light-diffusing element and the light-diffusing element. The deflection element is used to adjust the emission direction of the illumination light after it has been homogenized by the light-diffusing element.

8. The backlight module according to claim 7, characterized in that, The deflecting element is a deflecting prism and a diverging lens, or the deflecting element is a deflecting lens with several lens sections.

9. A display device, characterized in that, It includes a backlight module and a display unit as described in any one of claims 1-8, wherein the display unit is disposed on the light-emitting side of the backlight module.

10. A means of transportation, characterized in that, Includes the backlight module as described in any one of claims 1-8, or includes the display device as described in claim 9.

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