Backlight source and head-up display device

Abstract

The invention provides a backlight source and head-up display equipment, and belongs to the technical field of head-up display. The backlight source disclosed by the invention is applied to the head-up display equipment, and comprises a light source which comprises a plurality of light emitting units, and each of the plurality of light emitting units comprises one or more light emitting devices; the plurality of dimming parts are arranged in one-to-one correspondence with the plurality of light-emitting units and are positioned on the light-emitting surface side of the light-emitting device; the cross sectional area of the dimming part is monotonically increased in the direction from the light inlet end to the light outlet end; the dimming part is configured to correspond to different initial partitions of a display panel of the head-up display equipment and adjust the received emergent light of the light-emitting device; the heat conduction assembly at least comprises a plurality of heat conduction parts, and the multiple heat conduction parts and the multiple dimming parts are arranged in a one-to-one correspondence mode; and each of the plurality of heat conduction parts at least wraps the end part, close to the light emitting device, of the corresponding dimming part.

Description

Technical Field

[0001] This disclosure belongs to the field of head-up display technology, specifically relating to a backlight and a head-up display device. Background Technology

[0002] Head-up display (HUD) technology uses optical reflection to project light emitted from an image source onto an imaging window (image panel, windshield, etc.), which then reflects the light into the driver's eye, forming a virtual image. This virtual image can display desired information, such as vehicle speed and other driving-related information, preventing driver distraction caused by looking down at the instrument panel while driving. This improves driving safety and provides a better driving experience.

[0003] The image generation unit (PGU) in a head-up display (HUD) includes a backlight and a display panel. The display panel can be a liquid crystal display (LCD). The inventors discovered that the backlight continuously emits light, thus generating a large amount of heat. This affects the display effect of the HUD and the user experience. Therefore, providing a high-performance thermal management system to ensure reliable operation of the HUD within a safe temperature range is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a backlight and head-up display device.

[0005] This disclosure provides a backlight source for use in a head-up display device, comprising:

[0006] A light source includes multiple light-emitting units, each of which includes one or more light-emitting devices;

[0007] Multiple dimming units are provided, one-to-one with the multiple light-emitting units, and located on the light-emitting surface side of the light-emitting device; the cross-sectional area of ​​the dimming unit increases monotonically along the direction from its light-incident end to its light-emitting end; the dimming unit is configured to correspond to different initial partitions of the display panel of the head-up display device, and adjusts the emitted light from the light-emitting device received by it;

[0008] A heat-conducting component includes at least a plurality of heat-conducting parts, wherein the plurality of heat-conducting parts are arranged in a one-to-one correspondence with the plurality of dimming parts; each of the plurality of heat-conducting parts at least wraps around the end of the corresponding dimming part near the light-emitting device.

[0009] In some examples, the backlight further includes a heat dissipation component connected to the heat-conducting component for releasing the heat conducted by the heat-conducting component.

[0010] In some examples, the heat dissipation assembly includes at least one heat dissipation section, and the heat dissipation section is connected to at least one side of the heat conduction assembly, the heat dissipation section including a plurality of spaced-apart fins.

[0011] In some examples, the heat-conducting part has a first opening and a second opening disposed opposite to each other, the second opening being closer to the light source than the first opening, and the second opening being opposite to the corresponding light-emitting device for transmitting the emitted light from the corresponding light-emitting device.

[0012] In some examples, the heat-conducting part only wraps around the end of the corresponding dimming part near the light-emitting device, and the heat-conducting assembly also includes a heat spreader.

[0013] The heat spreader has a plurality of first receiving portions extending through its thickness direction. The plurality of first receiving portions are arranged in a one-to-one correspondence with the plurality of dimming portions, and the end of the dimming portion near the light source is disposed in the corresponding first receiving portion; wherein, the first receiving portion serves as the heat conducting portion.

[0014] In some examples, the thermally conductive component further includes a heat spreader; the thermally conductive portion is closer to the light source than the heat spreader.

[0015] The heat spreader plate has a plurality of first receiving portions extending through its thickness direction; the heat-conducting portion has a second receiving portion extending at least partially through its thickness direction; the first receiving portions and the second receiving portions are connected one-to-one to form a plurality of accommodating spaces; the accommodating spaces are used to enclose the end of the corresponding dimming portion near the light-emitting device.

[0016] In some examples, the dimming unit is a transparent, solid, frustum-shaped medium consisting of multiple reflective surfaces capable of total internal reflection of light.

[0017] In some examples, the dimming unit is at least partly a frustum-shaped cavity surrounded by a plurality of reflective surfaces capable of reflecting light.

[0018] In some examples, the plurality of dimming units are composed of a first part and a second part arranged sequentially along the direction away from the light-emitting surface of the light source. The first part is provided with a plurality of first segments of the frustum-shaped cavities, and the second part is provided with a plurality of second segments of the frustum-shaped cavities. The first segment and the second segment correspond one-to-one and together constitute a complete plurality of frustum-shaped cavities.

[0019] In some examples, the first segment further includes a first fixing plate, and all the first segments are fixed to the first fixing plate; the second segment further includes a second fixing plate, and all the second segments are fixed to the second fixing plate; the first fixing plate is connected to the second fixing plate;

[0020] The heat-conducting part is provided in a one-to-one correspondence with the first segment, and the heat-equalizing plate is fixed to the first fixing plate.

[0021] In some examples, the heat-conducting part covers the entire outer wall of the dimming part, and the individual heat-conducting parts are connected as a single structure.

[0022] In some examples, the thermally conductive parts are connected without gaps.

[0023] In some examples, the outer contour of the heat-conducting part is adapted to the outer contour of the corresponding dimming part, and the ends of each heat-conducting part near the light-emitting device are spaced apart.

[0024] In some examples, the dimming unit is a transparent, solid, frustum-shaped medium consisting of multiple reflective surfaces capable of total internal reflection of light.

[0025] In some examples, the dimming unit is at least partly a frustum-shaped cavity surrounded by a plurality of reflective surfaces capable of reflecting light.

[0026] In some examples, the main ray direction of the emitted light from each of the dimming units is the same;

[0027] or,

[0028] The main light rays emitted from each of the dimming units have different directions, so that the emitted light rays can be projected onto the central area of ​​the eye box of the head-up display device.

[0029] It also includes a lens structure disposed on the light-emitting end side of the plurality of dimming units; the lens structure is configured to adjust the light emitted from the dimming units.

[0030] In some examples, the lens structure includes a plurality of lenses with arcuate convex surfaces, each of which corresponds one-to-one with a plurality of dimming units; the lenses are configured to focus the outgoing light from the corresponding dimming unit.

[0031] In some examples, the dimming unit is configured to adjust the main ray of the emitted light from the light-emitting device according to the main ray angle required for the initial partition of the display panel;

[0032] The lens is configured to focus the light emitted from the dimming unit toward the main light direction.

[0033] In some examples, the lens is an off-center lens.

[0034] In some examples, the dimming unit is configured to adjust the main ray of the emitted light from the light-emitting device according to the main ray angle required for the initial partition of the display panel;

[0035] The lens is configured to adjust the main ray of the light emitted from the dimming unit according to the main ray angle required for the initial partition of the display panel, and to converge the light emitted from the dimming unit toward the main ray direction required for the initial partition of the display panel, so that the light emitted from the lens can be projected onto the center area of ​​the eye box of the head-up display device.

[0036] In some examples, the lens is an off-center lens.

[0037] In some examples, the lens structure includes a freeform lens configured to adjust the direction of at least a portion of the emitted light from each of the dimming units so that the emitted light from the display panel can be projected onto the central region of the eye box of the head-up display device.

[0038] In some examples, a diffusion element is provided on the light-emitting side of the lens structure, which is configured to diffuse the light emitted from the lens structure so that the light emitted from the display panel is diffused and forms a light spot covering the entire preset eye box area of ​​the head-up display device.

[0039] In some examples, the outer contour of the light-incident end of the dimming unit is circular or rectangular.

[0040] This disclosure provides a head-up display device, which includes:

[0041] Image source, including any of the backlights described above;

[0042] The display panel is disposed on the light-emitting side of the backlight and is configured to convert the light from the backlight into image light;

[0043] A reflective imaging element configured to receive the image light and output the image light to a preset eye box area of ​​the head-up display device.

[0044] In the backlight of this embodiment, the dimming section is wrapped at least one end near the light-emitting device by a heat-conducting part. This dissipates the heat generated by the light-emitting device on the dimming section, ensuring that the display panel can continue to operate in a safe state, thus making the backlight display more reliable. Furthermore, the heat-conducting parts in the heat-conducting assembly of this embodiment, by wrapping at least one end of the dimming section near the light-emitting device, also provide support for the dimming section, effectively preventing the dimming section in the middle area from collapsing due to its large size. Attached Figure Description

[0045] Figure 1 This is a schematic diagram illustrating the application of head-up display devices provided in some examples.

[0046] Figure 2 This is an illustration of the application of a head-up display device provided in some other examples.

[0047] Figure 3 This is a schematic diagram of a backlight source according to an embodiment of the present disclosure.

[0048] Figure 4 This is a schematic diagram of the dimming unit according to an embodiment of the present disclosure.

[0049] Figure 5 This is a top view of the light source according to an embodiment of the present disclosure.

[0050] Figure 6 This is a schematic diagram of the initial partitioning of the display panel according to an embodiment of the present disclosure.

[0051] Figure 7a This is a schematic diagram of a heat-conducting component according to an embodiment of the present disclosure.

[0052] Figure 7b This is a schematic diagram of a thermally conductive component according to an embodiment of the present disclosure.

[0053] Figure 7c This is a schematic diagram of a heat-conducting part according to an embodiment of the present disclosure.

[0054] Figure 8 This is a schematic diagram of a dimming unit applied to a backlight in a first example of an embodiment of this disclosure.

[0055] Figure 9a for Figure 8 The diagram shows a view of the assembly of the dimming unit, the heat-conducting component, and the heat-dissipating component.

[0056] Figure 9b for Figure 8 The diagram shows another perspective of the assembly of the dimming unit, the heat-conducting component, and the heat dissipation component.

[0057] Figure 10aThis is a schematic diagram of a thermally conductive component according to an embodiment of the present disclosure.

[0058] Figure 10b This is a schematic diagram of another thermally conductive component according to an embodiment of the present disclosure.

[0059] Figure 10c for Figure 10b The diagram shows a thermally conductive component enclosing the dimming section near the light-emitting device.

[0060] Figure 11 for Figure 8 Another schematic diagram showing the assembly of the dimming unit with the heat-conducting and heat-dissipating components.

[0061] Figure 12a This is a schematic diagram of the dimming unit, heat-conducting component, and heat dissipation component assembled from a second example of an embodiment of this disclosure.

[0062] Figure 12b This is a schematic diagram of the dimming unit, heat-conducting component, and heat dissipation component assembled from another perspective, representing a second example of an embodiment of this disclosure.

[0063] Figure 13 This is a schematic diagram illustrating the application of a dimming unit in a backlight, representing a third example of an embodiment of this disclosure.

[0064] Figure 14 for Figure 13 The diagram shows the assembly of the dimming unit with the heat-conducting and heat-dissipating components.

[0065] Figure 15 for Figure 14 A schematic diagram of the heat-conducting components.

[0066] Figure 16 This is a schematic diagram of an upright light cone according to an embodiment of the present disclosure.

[0067] Figure 17 This is a schematic diagram of an illumination area formed by a dimming component according to an embodiment of the present disclosure.

[0068] Figure 18 This is a schematic diagram of another illuminance area formed by the dimming component according to an embodiment of the present disclosure.

[0069] Figure 19 This is a schematic diagram of an exemplary dimming component according to an embodiment of the present disclosure.

[0070] Figure 20 for Figure 19 A partial magnified view of the light-emitting surface of the lens with an arcuate convex surface of the dimming component.

[0071] Figure 21 This is a schematic diagram of the structure of the tilted dimming section combined with the non-eccentric lens according to an embodiment of the present disclosure.

[0072] Figure 22 Three schematic diagrams illustrating how multiple first microstructures adjust light according to embodiments of this disclosure.

[0073] Figure 23 This disclosure presents a schematic diagram showing that the dimming unit and the lens with an arcuate convex surface are independently arranged according to an embodiment.

[0074] Figure 24 This is a schematic diagram showing the dimming units arranged in an array according to an embodiment of the present disclosure.

[0075] Figure 25 This is a schematic diagram of a lens array according to an embodiment of the present disclosure.

[0076] Figure 26 This is a schematic diagram of the side of the second substrate away from the lens with an arcuate convex surface, according to an embodiment of the present disclosure.

[0077] Figure 27 This is a partially enlarged view of a diffusion element formed on the side of a second substrate away from a lens having an arcuate convex surface, according to an embodiment of the present disclosure.

[0078] Figure 28 This is a schematic diagram of the side of the first substrate away from the dimming section, according to an embodiment of the present disclosure.

[0079] Figure 29 This is a partial schematic diagram of another exemplary dimming component according to an embodiment of the present disclosure.

[0080] Figure 30 for Figure 29 The diagram shows a partial application of the dimming component in a backlight.

[0081] Figure 31 This is a schematic diagram of the dimming unit working with an eccentric lens.

[0082] Figure 32 This is a schematic diagram illustrating the direction control principle of an eccentric lens.

[0083] Figure 33 This is a partial schematic diagram of another exemplary dimming component according to an embodiment of the present disclosure.

[0084] Figure 34 This is a schematic diagram showing that the dimming unit and the freeform lens are independently configured according to an embodiment of the present disclosure.

[0085] Figure 35 This is a schematic diagram of an image source according to a disclosed embodiment.

[0086] Figure 36 This is a schematic diagram of another image source for a disclosed embodiment.

[0087] Figure 37This is a schematic diagram of the structure of a head-up display device according to an embodiment of the present disclosure.

[0088] Figure 38 This is a schematic diagram of a head-up display device and a windshield, which are some examples of this disclosure. Detailed Implementation

[0089] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0090] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0091] Figure 1 This is an exemplary application diagram of a head-up display device, which can be installed on vehicles or other means of transportation. Figure 1 As shown, the head-up display device includes an image generation unit 100 for outputting image light. The image generation unit 100 includes a backlight 10 and a display panel 20 disposed on the light-emitting side of the backlight 10. For example, the display panel 20 is a liquid crystal display panel. The display panel 20 includes multiple pixel units, each pixel unit including multiple pixels, for example, each pixel unit including red pixels, green pixels, and blue pixels; or, for example, each pixel unit including red pixels, green pixels, blue pixels, and white pixels. The display panel 20 is used to convert the light from the backlight 10 into image light. The windshield 200 of the vehicle is used to reflect the image light to the eye box area 300, so that when the observer's eyes are within the eye box area 300, they can see the image formed by the image light. At this time, the image seen by the observer is a virtual image 400 formed by the windshield 200 through reflection imaging. The observer can be a driver or a passenger. The observer can obtain the required vehicle information from the virtual image 400 in front of their line of sight, such as driving speed, fuel consumption, etc., or other information, such as images from virtual rearview mirrors or audio-visual entertainment images.

[0092] Specifically, the eyebox region 300 of the head-up display device refers to the area where the observer's eyes are located and where they can see the image output by the head-up display device. The eyebox region 300 has a certain size, so even if the observer's eyes are deviated from the center of the eyebox region 300 by a certain distance, such as a certain distance in the vertical or horizontal direction, as long as they are still within the eyebox region 300, they can see the image output by the head-up display device.

[0093] Figure 2 Here are some other examples illustrating the application of head-up display devices; such as Figure 2 As shown, the backlight 10 includes a light source 101, a converging element 102, and a light angle control element 103. The light source 101 may include multiple light-emitting devices, the converging element 102 may be a lens, and the light angle control element 103 may include a direction control film and a diffusion element. In this case, the light emitted from the light-emitting devices is converged and collimated by the lens before illuminating the direction control film. The direction control film further adjusts the main light direction and divergence angle, and then the diffusion element diffuses the light to provide backlight for the display panel. After the direction control film adjusts the light, the main light emitted from each pixel of the display panel can be directed towards the central region 300a of the eye box.

[0094] It should be noted that the central region 300a of the eyeshadow box is a small area that covers the geometric center of the preset eyeshadow box region 300. For example, the center of the central region 300a of the eyeshadow box coincides with the center of the preset eyeshadow box region 300. The shapes of the central region 300a of the eyeshadow box and the preset eyeshadow box region 300 may be the same or different.

[0095] The inventors discovered that after the light emitted by the light-emitting device is homogenized by multiple components, the backlight efficiency is low and there is a problem of dispersion.

[0096] In response to the above technical issues, Figure 3 This is a schematic diagram of a backlight source according to an embodiment of the present disclosure; Figure 4 This is a schematic diagram of the dimming unit according to an embodiment of the present disclosure; Figure 5 This is a top view of the light source according to an embodiment of the present disclosure; Figure 6 This is a schematic diagram of the initial partitioning of the display panel according to an embodiment of the present disclosure; as shown Figure 3-6As shown, this embodiment of the present disclosure provides a backlight source, including a light source 101 and a dimming assembly 30 located on the light-emitting surface side of the light source 101. The light source 101 includes multiple light-emitting units A, each light-emitting unit A including one or more light-emitting devices 1011. The dimming assembly 30 includes multiple dimming sections 301, each dimming section 301 corresponding to a light-emitting unit A, and located on the light-emitting surface side of the light-emitting device 1011. The cross-sectional area of ​​the dimming section 301 increases monotonically along the direction from its light-incident end to its light-emitting end. The dimming section 301 is configured to correspond to different initial partitions Q1 of the display panel 20 of the head-up display device, and adjusts the emitted light from the light-emitting device 1011 received by it.

[0097] In this embodiment of the backlight, the dimming unit 301 in the dimming assembly 30 can focus at least a portion of the light emitted by the light-emitting device 1011, that is, focus the light emitted by the light-emitting device 1011 from a large angle range into a small angle range, and there is no lens dispersion problem.

[0098] Since the light-incident end of the dimming section is opposite to the light-emitting device 1011, the light-emitting device is in a light-emitting state for a long time. Over time, the heat generated increases, so the temperature of the dimming section is higher the closer it is to the light-emitting device 1011. To address this problem, the backlight of this disclosure embodiment provides the following technical solution.

[0099] In some examples, Figure 7a This is a schematic diagram of a heat-conducting component according to an embodiment of the present disclosure; Figure 7b This is a schematic diagram of the thermally conductive component according to an embodiment of the present disclosure; as shown Figure 7a and Figure 7b As shown, the backlight 101 of this embodiment includes not only the dimming component 30 and the light source 101 described above, but also a heat-conducting component for dissipating heat from the dimming component.

[0100] The heat-conducting component in this embodiment includes at least a plurality of heat-conducting parts 61, each heat-conducting part 61 being disposed in a one-to-one correspondence with a dimming part 301, and each heat-conducting part 61 at least wraps around the end of the corresponding dimming part near the light-emitting device 1011.

[0101] In this embodiment, the dimming section 301 is wrapped at least one end near the light-emitting device 1011 by the heat-conducting part 61. This dissipates the heat generated by the light-emitting device 1011 on the dimming section 301, ensuring that the display panel can continue to operate in a safe state, thus making the backlight display more reliable. Furthermore, the heat-conducting parts 61 in this embodiment, by wrapping at least one end of the dimming section 301 near the light-emitting device 1011, also provide support for the dimming section 301, effectively preventing the dimming section 301 in the middle area from collapsing due to the large size of the dimming assembly 30.

[0102] In some instances, continue to refer to Figure 7a and Figure 7b The backlight in this embodiment not only includes a heat-conducting component but also a heat-dissipating component, which can release the heat conducted by the heat-conducting component. In one example, the heat-dissipating component has at least one heat-dissipating part 71, and the heat-dissipating part 71 is connected to at least one side of the heat-conducting component. The heat-dissipating part 71 includes a plurality of spaced fins 711. For example, if the outline of the heat-conducting component is quadrilateral, heat-dissipating fins 711 can be provided on at least one side of the heat-conducting component according to product requirements to better release heat. Furthermore, the heat-dissipating component and the heat-conducting component in this embodiment can adopt an integral molding structure, formed by injection molding. This structure is simple and robust, and injection molding facilitates manufacturing.

[0103] In some instances, Figure 7c This is a schematic diagram of a heat-conducting part according to an embodiment of the present disclosure. When the dimming part 301 has such Figure 4When the frustum-shaped structure is shown, its cross-sectional area increases monotonically along the direction from its light-incident end to its light-outceasing end. Correspondingly, the heat-conducting part 61 of this embodiment has a structure and shape corresponding to the dimming part, and the two work together to achieve the purpose of heat dissipation for the dimming part. At the same time, the heat-conducting part 61 has a first opening 611 and a second opening 612 arranged opposite to each other. The second opening 612 is closer to the light source 101 than the first opening 611, and the second opening 612 and the corresponding light-emitting device 1011 are opposite each other, for transmitting the emitted light from the corresponding light-emitting device 1011. In this case, by providing the second opening 612 on the side of the heat-conducting part 61 closer to the light source 101, the light transmittance can be effectively improved. In one example, the heat-conducting part 61 may include a bottom wall 613 opposite to the first opening 611, and the second opening 612 is formed on the bottom wall 613. In this case, not only can the light transmittance be improved, but the dimming part 301 can also be wrapped as much as possible around the end closer to the light source 101, further improving the heat dissipation capacity. Of course, if the material used for the heat-conducting part 61 is a transparent heat-dissipating material, then the second opening 612 may not be provided on the first bottom wall. Of course, to simplify design and manufacturing, the heat-conducting part 61 may also not have a bottom wall. In this case, the second opening 612 can be adapted to the light-incident surface of the dimming part 301, that is, the area of ​​the second opening 612 is equal to the area of ​​the light-incident surface of the dimming part 301. In this case, the heat-conducting part 61 is similar to forming a cylindrical structure that runs through the thickness direction on a relatively thick substrate.

[0104] In some instances, the thermally conductive component of this disclosure embodiment may only wrap the end of the dimming part 301 near the light-emitting device, or it may completely wrap the outer wall of the dimming part 301.

[0105] In some instances, the dimming unit 301 in this embodiment can be a transparent, solid frustum-shaped medium surrounded by multiple reflective surfaces capable of total internal reflection of light, or it can be at least partially a frustum-shaped cavity surrounded by multiple reflective surfaces capable of reflecting light. When the dimming unit 301 is a transparent, solid frustum-shaped medium, it is a light cone; when the dimming unit 301 is a frustum-shaped cavity, it is a lamp tube. The dimming unit 301 of this embodiment will be described below with reference to specific examples.

[0106] First example: Figure 8 This is a schematic diagram illustrating the application of a dimming unit in a backlight, representing a first example of an embodiment of this disclosure; as shown... Figure 8As shown, the overall structure of the dimming unit 301 is composed of a frustum-shaped cavity. In this case, the entire frustum-shaped medium of the dimming unit 301 is a space enclosed by reflective surfaces; that is, the dimming unit 301 is a lamp tube. The smaller opening of the two openings in the cavity is the light-inlet end, and the larger opening is the light-outlet end. The light-transmitting area of ​​the light-inlet end is smaller than that of the light-transmitting area of ​​the light-outlet end, and the light-inlet end is positioned opposite to the light-outlet surfaces of each light-emitting device 1011 in a light-emitting unit A. Here, the light-transmitting area refers to the opening area of ​​the cavity. However, this embodiment is not limited to this. In practical applications, the dimming unit 301 can also be composed of a cavity and other transparent solid media. For example, part of the dimming unit 301 may be a frustum-shaped cavity enclosed by multiple reflective surfaces, and another part may be a frustum-shaped transparent medium enclosed by multiple total reflection surfaces. In this case, part of the reflective surface of the dimming unit 301 (i.e., the reflective surface of the cavity) is reflective, and the other part (i.e., the reflective surface of the transparent medium) is totally reflective.

[0107] When the dimming unit 301 adopts a lamp tube structure, the light-emitting unit A can be located either outside the dimming unit 301 or inside the cavity of the dimming unit 301. When the light-emitting unit A is located outside the dimming unit 301, the dimming unit 301 can be entirely composed of frustum-shaped cavities (i.e., the entire frustum-shaped medium is a cavity). The opening of the frustum-shaped cavity near the end of the light-emitting unit A is the light-incident end, which is positioned opposite to the light-emitting surface of each light-emitting device 1011 of the light-emitting unit A.

[0108] In one example, the light-incident end of the dimming unit 301 is spaced apart from or attached to the light-emitting surfaces of the light-emitting devices 1011 of the opposing light-emitting unit A. Specifically, the light-incident end of the dimming unit 301 is attached to the light-emitting surfaces of the opposing light-emitting unit A, i.e., there is no gap. This configuration maximizes light focusing and improves luminous efficacy. However, direct contact between the dimming unit 301 and the light-emitting devices 1011 may damage them. To protect the light-emitting devices 1011, the light-incident end of the dimming unit 301 is spaced apart from the light-emitting surfaces of the opposing light-emitting units A. This gap should be as small as possible without damaging the light-emitting devices 1011 to improve light focusing and luminous efficacy. In one example, this gap is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0109] When the light-emitting unit A is disposed within the cavity of the dimming section 301, the dimming section 301 can be entirely composed of a cavity, which is actually divided into two parts. One part is located above the light-emitting surface of the light-emitting unit A, serving as the aforementioned frustum-shaped medium with an incident light end and an emitting light end. In this case, the incident light end is the opening of the cavity located above the light-emitting surface of the light-emitting device 1011, near the light source end, and this incident light end is disposed opposite to the light-emitting surface of at least one light source. The other part of the cavity is located below the light-emitting surface of the light source, and this part serves as the placement space for the light-emitting unit A.

[0110] By placing the light-emitting unit A inside the cavity of the dimming section 301, all or most of the light emitted by the light-emitting device 1011 inside the cavity can be focused, resulting in less light loss and no damage to the light-emitting device 1011. However, due to the limitation of the external package size of the light-emitting device 1011, the size of the portion of the dimming section 301 below the light-emitting surface of the light-emitting unit A and the size of the light-incident end cannot be designed within a small range when accommodating the light-emitting device 1011. The size of the light-emitting end usually needs to be adapted to the corresponding partition size of the display panel 20 and cannot be arbitrarily increased. This results in a small size difference between the light-incident end and the light-emitting end of the dimming section 301, which is not conducive to the light focusing effect of the dimming section 301. When the light-emitting unit A is located outside the corresponding dimming section 301, the size of the light-incident end does not need to take into account the external package size of the light-emitting unit A, but only the light-emitting size (e.g., the size of the light-emitting surface) of the light-emitting device 1011. Therefore, compared with the solution of accommodating the light-emitting device 1011 in the cavity of the dimming section 301, it is easier to design the size of the light-incident end within a smaller range by setting the light-emitting unit A outside the dimming section 301. Thus, it is easy to design a dimming section 301 with a large size difference between the light-incident end and the light-emitting end, thereby enabling the dimming section 301 to have a better light-gathering effect.

[0111] Continue to refer to Figure 8 To simplify the structure and facilitate processing and installation, this embodiment employs an integral structure as the support for the multiple dimming units 301, i.e., a plate-shaped main body. This plate-shaped main body can be, for example, a rectangular plate or a square plate, and its shape can be determined according to the shape of the display surface of the display panel 20. At least a portion of the frustum-shaped medium of the dimming unit 301 is a frustum-shaped cavity formed within the plate-shaped main body. The light-emitting end of the dimming unit 301 is located on the surface of the plate-shaped main body opposite to the light source 101. The reflective surface can be a surface covered with a reflective layer on the side of the cavity (e.g., an aluminum layer), or a film layer forming a mirror or other surface capable of reflecting light.

[0112] In this case, Figure 9a for Figure 8The diagram shows an assembly view of the dimming unit, the heat-conducting component, and the heat-dissipating component. Figure 9b for Figure 8 The diagram shows another perspective of the assembly of the dimming unit, the heat-conducting component, and the heat-dissipating component; as shown. Figure 9a and Figure 9b Each heat-conducting part 61 in the heat-conducting assembly can completely enclose its corresponding dimming part 301 to dissipate the heat generated by the dimming part as much as possible. Furthermore, a heat dissipation part 71 can be provided on at least part of the outer periphery of the heat-conducting assembly. The heat dissipation part 71 includes a plurality of spaced fins 711. Figure 9a and Figure 9b Taking the example of heat dissipation sections 71 arranged on three sides of the periphery of the heat-conducting component, this does not constitute a limitation on the scope of protection of the embodiments disclosed herein. The shape or arrangement of the heat dissipation section 71 can be specifically designed according to product requirements.

[0113] The heat-conducting part 61 may also only cover the end of the corresponding dimming part 301 near the light-emitting device 1011. In one example, Figure 10a This is a schematic diagram of a thermally conductive component according to an embodiment of the present disclosure; as shown Figure 10a As shown, when each heat-conducting part 61 in the heat-conducting assembly can only wrap around the end of its corresponding dimming part near the light-emitting device 1011, the heat-conducting assembly also includes a heat-spreading plate 62. The thickness of the heat-spreading plate 62 can be set to about 2 mm. The heat-spreading plate 62 includes a plurality of first receiving parts 621 that extend through its thickness direction and are spaced apart. Each of the plurality of first receiving parts 621 corresponds one-to-one with a plurality of dimming parts 301. The end of the dimming part near the light source 101 is disposed within its corresponding first receiving part 621, which serves to conduct heat to the corresponding dimming part 301. In this case, each heat-conducting part 61 and the heat-spreading plate 62 are integrated into a single structure, which is simple and can effectively dissipate heat. In another example, Figure 10b This is a schematic diagram of another thermally conductive component according to an embodiment of the present disclosure; as shown Figure 10b As shown, the heat-conducting assembly also includes a heat spreader 62, which has a plurality of first receiving portions 621 that extend through its thickness direction and are spaced apart. Figure 10b (not shown in the image), similar to Figure 10a As shown; the heat-conducting part 61 also has a second receiving part 614 that at least partially extends through its thickness direction. The first receiving part 621 and the second receiving part 614 are connected one-to-one to form a plurality of receiving spaces. The receiving spaces are arranged one-to-one with the dimming part 301 and are used to wrap the end of the dimming part 301 near the light-emitting device 1011, such as Figure 10c As shown. In this case, there is a certain gap between each heat-conducting part 61, resulting in better heat dissipation.

[0114] In one example, whether the heat-conducting part 61 only wraps around the end of the corresponding dimming part 301 near the light-emitting device 1011, or completely wraps around the outer wall of the corresponding dimming part 301, each heat-conducting part 61 of the heat-conducting assembly can be an integral structure. For example, if each heat-conducting part 61 is tightly connected without gaps, multiple cylindrical structures can be provided on a thick plate-like structure adapted to the height of the dimming part to form multiple heat-conducting parts 61 of the heat-conducting assembly. This structure is simple and... Figure 7a and 7b As shown. For example, Figure 11 for Figure 8 Another schematic diagram showing the assembly of the dimming unit with the heat-conducting and heat-dissipating components; as shown Figure 11 As shown, multiple grooves can be provided on the end face of the plate structure where the heat conduction component is located, which is close to the light-emitting device 1011, so that each heat conduction part 61 is spaced apart. At this time, there is a certain heat dissipation space between adjacent heat conduction parts 61, which facilitates the release of heat and also reduces the weight of the heat conduction component.

[0115] Second example: Figure 12a This is a schematic diagram of the dimming unit and the heat-conducting component assembled from one perspective, representing a second example of an embodiment of this disclosure. Figure 12b This is a schematic diagram of the dimming unit and the heat-conducting component from another perspective, representing a second example of an embodiment of this disclosure; as shown... Figure 12a and Figure 12b As shown, the structure of the dimming component in this example is roughly the same as that in the first example. The only difference is that multiple dimming units are composed of a first segment and a second segment arranged sequentially along the light-emitting surface away from the light source. The first segment has a first segment 301a with multiple frustum-shaped cavities, and the second segment has a second segment 301b with multiple frustum-shaped cavities. The first segment 301a and the second segment 301b correspond one-to-one and together constitute multiple complete frustum-shaped cavities. That is, each dimming unit 301 is formed by splicing the first segment 301a and the second segment 301b. In this case, by adopting a segmented structure, the dimming unit 301 can first process the two segments of the frustum-shaped cavities on the two segments separately. The thickness of each segment on each segment is reduced compared to the complete frustum-shaped cavity, making it easier to process the reflective layer on the segment near the light-incident end of the frustum-shaped cavity (if it is entirely a cavity), thereby reducing the processing difficulty and cost.

[0116] Furthermore, the first component also includes a first fixing plate 301c, and all first segments 301a are fixed to the first fixing plate 301c; the second component also includes a second fixing plate 301d, and all second segments 301b are fixed to the second fixing plate 301d; the first fixing plate 301c and the second fixing plate 301d are connected. In this case, each heat-conducting part 61 in the heat-conducting assembly can only wrap around the corresponding dimming part first segment 301a, and the heat-conducting part 61 and the first segment 301a are arranged in a one-to-one correspondence, and the heat-dampening plate is fixed to the first fixing plate 301c. For example, the first fixing plate 301c and the second fixing plate 301d are snapped together, and the heat-dampening plate 62 and the first fixing plate 301c can be fixedly connected by bolts, or they can be bonded together by an adhesive layer.

[0117] The third example: Figure 13 This is a schematic diagram illustrating the application of a dimming unit in a backlight, representing a third example of an embodiment of this disclosure; as shown... Figure 13 As shown, the dimming section is a transparent, solid, frustum-shaped medium surrounded by multiple reflective surfaces capable of total internal reflection of light. That is, the dimming section 301 is a light cone. In this case, the smaller end face of the dimming section 301 is the light-incident end, and the larger end face is the light-exiting end. The light-passing area at the light-incident end is smaller than the light-passing area at the light-exiting end, and the light-incident end is positioned opposite to the light-exiting surface of the light-emitting unit A; the dimming section 301 is used to focus at least a portion of the emitted light from the corresponding light-emitting unit A. Here, the light-passing area refers to the area of ​​the end face of the transparent solid medium.

[0118] In some examples, the outer contour of the light-incident surface of the transparent solid frustum-shaped medium can be either rectangular or circular. For example, when the light-incident surface of the transparent solid frustum-shaped medium is circular and the light-exit surface is rectangular, the circular light-incident surface to the rectangular light-exit surface can be formed using a lofting method. When the light-incident surface is circular, the area of ​​the light-incident port can be relatively large, which is easier to implement in the manufacturing process.

[0119] In some examples, the incident surface of the transparent solid frustum-shaped medium can be a plane or a free-form surface. By properly designing the incident surface of the transparent solid medium, the light efficiency can be improved and the light loss can be reduced.

[0120] In some examples, the dimming assembly 30 also includes a first substrate made of the same material as the dimming unit 301. The first substrate can serve as a support for each dimming unit 301. The shape of the first substrate is, for example, a rectangular plate or a square plate, and the shape of the first substrate can be set according to the shape of the display surface. The first substrate can be transparent glass.

[0121] In some embodiments, the transparent, solid frustum-shaped medium can be made of a material with a refractive index greater than that of transparent glass. Alternatively, it can be made of silicone or PC plastic.

[0122] In this case, each heat-conducting part 61 in the heat-conducting assembly can either wrap only the end of the corresponding dimming part near the light-emitting device, or completely wrap the outer wall of the corresponding dimming part.

[0123] In one example Figure 14 for Figure 13 The diagram shows the assembly of the dimming unit and the heat-conducting components. Figure 15 for Figure 14 A schematic diagram of the heat-conducting components in the diagram; as shown. Figure 14 and Figure 15 As shown, when each heat-conducting part 61 in the heat-conducting assembly only covers the end of its corresponding dimming part 301 near the light-emitting device 1011, the heat-conducting assembly also includes a heat-spreading plate 62. The thickness of the heat-spreading plate 62 can be set to approximately 2 mm. This heat-conducting assembly can be selected from... Figure 10a or Figure 10b Thermally conductive components. Specifically, such as... Figure 10a As shown, the heat spreader 62 includes a plurality of first receiving portions 621 extending through its thickness and spaced apart. Each of the first receiving portions 621 corresponds to a plurality of dimming portions 301. The end of each dimming portion near the light source 101 is disposed within its corresponding first receiving portion 621, which serves to conduct heat to the corresponding dimming portion 301. In this case, each heat-conducting portion 61 and the heat spreader 62 are integrated into a single structure, which is simple and effectively dissipates heat. Figure 10b As shown, the heat-conducting assembly also includes a heat spreader 62, which has a plurality of first receiving portions 621 extending through its thickness and spaced apart; the heat-conducting portion 61 has a second receiving portion 614 extending at least partially through its thickness. The first receiving portions 621 and the second receiving portions 614 are connected one-to-one to form a plurality of accommodating spaces, which are correspondingly arranged with the dimming portion 301 and are used to wrap the end of the dimming portion 301 near the light-emitting device 1011, such as... Figure 10c As shown. In this case, there is a certain gap between each heat-conducting part 61, resulting in better heat dissipation.

[0124] In one example, whether the heat-conducting part 61 only wraps around the end of the corresponding dimming part 301 near the light-emitting device, or completely wraps around the outer wall of the corresponding dimming part 301, each heat-conducting part 61 of the heat-conducting assembly can be an integral structure. For example, if each heat-conducting part 61 is tightly connected without gaps, multiple cylindrical structures can be set on a thick plate-like structure adapted to the height of the dimming part 301 to form multiple heat-conducting parts 61 of the heat-conducting assembly. This structure is simple. As another example, multiple grooves can be set on the end face of the thick plate-like structure where the heat-conducting assembly is located near the light-emitting device 1011, so that each heat-conducting part 61 is spaced apart. In this case, there is a certain heat dissipation space between adjacent heat-conducting parts 61, which facilitates the release of heat.

[0125] In some examples, the dimming unit 301 may be a transparent, solid, frustum-shaped medium surrounded by multiple reflective surfaces capable of total internal reflection of light, or at least a portion of it may be a frustum-shaped cavity surrounded by multiple reflective surfaces capable of reflecting light. Each dimming unit 301 can be an upright dimming unit, such as... Figure 16 As shown, the dimming unit 301 can be a vertical dimming unit, meaning that the main ray direction of the emitted light from each dimming unit is the same, for example, all perpendicular to the display surface of the display panel 20. When the light-emitting surface of the light source 101 is parallel to the display surface of the display panel 20, the main ray direction is, for example, perpendicular to the light-emitting surface of the light source 101. Here, the dimming unit 301 can focus at least a portion of the emitted light from the corresponding light-emitting device, so that most or all of the light emitted from the dimming unit 301 is a focused light along the main ray direction of the emitted light from the dimming unit 301, thereby directing at least a portion of the emitted light from the light-emitting device toward the main ray direction of the dimming unit 301, and focusing the divergent emitted light from the light-emitting device into a smaller angular range.

[0126] Of course, at least some of the dimming units 301 can also be tilted dimming units, that is, at least some dimming units 301 have different main ray directions for their emitted light, such as... Figure 3 , 13 As shown. The tilting dimming unit is configured to adjust the main ray of the emitted light from the light-emitting device 1011 according to the main ray angle required by the partition of the display panel 20. In the embodiments of this disclosure, whether all dimming units 301 are upright dimming units or at least some are tilting dimming units, as long as the emitted light from the light-emitting device 1011 adjusted by the dimming unit 301 can be projected onto the center area of ​​the eye box of the head-up display device, it is within the protection scope of the embodiments of this disclosure.

[0127] Among them, Figure 3 , 8In section 13, all light-emitting devices 1011 are on the same horizontal plane, the light-incident ends of all dimming sections 301 are on the same horizontal plane, and the light-emitting surfaces of the light-emitting devices 1011 and the light-incident surfaces of the dimming sections are arranged parallel to each other; the light-emitting ends of all dimming sections 301 are on the same horizontal plane and are arranged parallel to the display surface of the display panel. In this case, the light-emitting surfaces of the light-emitting devices 1011, the light-incident ends and light-emitting surfaces of the dimming sections 301, and the display surface of the display panel 20 are all arranged parallel to each other. Of course, in practical applications, the light-incident surfaces of the light-emitting devices 1011 and the display surface of the display panel 20 can also form a certain angle according to actual needs. It should be noted that in this embodiment of the present disclosure, the light-emitting devices 1011 are fixed on a horizontal lamp board (printed circuit board 1012) so that all light-emitting devices 1011 are on the same horizontal plane. In some examples, in order for the image formed by the display panel 20 to be effectively projected onto the reflective imaging device, different initial zones Q1 of the display panel 20 require light rays with different principal ray angles. In this embodiment, the principal ray of the emitted light from the dimming unit 301 is set according to the different zones of the display panel 20, so that the principal ray of the light emitted by the light-emitting device 1011 via the dimming unit 301 meets the requirements of the corresponding initial zone Q1 of the display panel. The adjustment of the principal ray of the emitted light from the dimming unit 301 can be achieved by adjusting the tilt angle of the dimming unit 301. The tilt angle of the dimming unit 301 refers to the angle formed by connecting the center of the light-incident end and the center of the light-emitting surface of the dimming unit 301 with the horizontal plane. In other words, by adjusting the angle formed by the line connecting the center of the light-incident end and the center of the light-emitting surface of the dimming unit 301 with the horizontal plane, the principal ray of the emitted light from the dimming unit 301 can be adjusted. The partitions of the display panel 20 refer to multiple areas divided by the display area of ​​the display panel 20. Each partition contains at least one pixel. In practical applications, the parameters such as the number, shape, size, and arrangement of the partitions of the display panel 20 can be set according to specific needs.

[0128] Furthermore, in one example, the light-incident end and light-exit surface of each dimming unit 301 are arranged parallel to each other, and the shape and size (e.g., area) of the light-incident end of each dimming unit 301 are equal, as are the shape and size (e.g., area) of the light-exit end of each dimming unit 301. The tilt angle of the dimming unit 301 can be adjusted by adjusting the relative position of the light-incident end and the light-exit end of each dimming unit 301, thereby adjusting the relative position of the center of the light-incident end and the center of the light-exit end. Of course, the adjustment of the tilt angle of the dimming unit 301 is not limited to this; it can also be achieved by adjusting the area of ​​the light-incident end and / or the light-exit end of the dimming unit 301, etc., which will not be listed here.

[0129] In some examples, the dimming unit 301 is configured to form an illumination area 310 with a preset shape from the light emitted therethrough. The preset shape may be a rectangle or a hexagon. For example, the preset shape may be a square or a regular hexagon. Figure 17 A schematic diagram of an illumination area formed by a dimming component according to an embodiment of the present disclosure;

[0130] Figure 18 A schematic diagram of another illuminance region formed by the dimming component according to an embodiment of this disclosure; Figure 17 The illuminance area 310 is a square. Figure 18 The illuminance area 310 is a regular hexagon, similar to a square; refer to Figure 17 and 18 Furthermore, the illuminance areas 310 formed by the light emitted from each dimming unit 301 have the same shape. In this case, the illuminance areas 310 formed by the light emitted from each dimming unit 301 can achieve seamless contact, thereby improving the uniformity of backlighting. Of course, the edges of the illuminance areas 310 formed by the light emitted from each dimming unit 301 may overlap.

[0131] Furthermore, the shape of the light-emitting end of the dimming unit 301 defines the shape of the illuminance area 310 formed by the emitted light. Therefore, the light-emitting end of the dimming unit 301 in this embodiment can be any one of a square, a rectangle, or a regular hexagon.

[0132] In some examples, Figure 19 This is a schematic diagram of an exemplary dimming component according to an embodiment of the present disclosure; Figure 20 for Figure 19 A partial magnified view of the light-emitting surface of the lens with an arcuate convex surface in the dimming assembly; as shown. Figure 19 and 20As shown, the dimming assembly 30 not only includes the above-described structure, but also includes a plurality of lenses 303 with arcuate convex surfaces, each corresponding to a dimming unit 301, and a diffusion element 302 formed on the light-emitting surface side of the lens 303 with arcuate convex surfaces. Specifically, in this embodiment, the dimming units 301 are arranged in an array, and each dimming unit 301 has a lens 303 with an arcuate convex surface on its light-emitting end side, and the diffusion assembly is disposed on the light-emitting surface side of the lens 303 with an arcuate convex surface. The lens 303 with an arcuate convex surface is configured to focus the light emitted from the corresponding dimming unit 301. The reason for providing a lens 303 with a curved convex surface is that the light emitted from the light-emitting device 1011 is divergent. After being adjusted by the dimming unit 301, not only is the main light ray adjusted, but the light ray as a whole is also collected. However, the light emitted through the dimming unit 301 is still divergent. At this time, the lens 303 with a curved convex surface, which is provided on the light-emitting side of the dimming unit 301, focuses the light so that the light emitted by the dimming unit 301 is further collected towards the main light ray direction required by the initial partition Q1 of the corresponding display panel. The overall light is adjusted to a preset angle range. The diffusion element 302 is configured to diffuse the light emitted by the lens 303 with a curved convex surface so that the light can be projected onto the entire preset eye box area 300. In this way, the viewing range can be expanded. At this time, the observer can see the image of the display panel 20 at any position in the preset eye box area 300.

[0133] It should be noted that the light-incident ends of all dimming units 301 are identical in size and shape. In this embodiment, the dimming units 301 are arranged in an array, meaning that the light-outceasing ends of each dimming unit 301 are arranged in an array, with the light-outceasing end of the dimming unit 301 as the reference. Furthermore, in Figure 19 In the dimming assembly 30, the main beam emitted from the light-emitting device 1011 is adjusted by the dimming unit 301, while the lens 303 with a curved convex surface focuses the emitted beam from the dimming unit 301. In some examples, there is a gap between the light-emitting ends of each dimming unit 301. This is done to facilitate implementation during fabrication, but it should be understood that the gap between the light-emitting ends of each dimming unit 301 is very small to avoid uneven light distribution.

[0134] In some examples, the dimming assembly 30 in this embodiment can also adjust the emitted light from the light-emitting device 1011 by reducing the size of a single dimming unit 301 and increasing the number of dimming units 301. In this case, it is not necessary to set a lens 303 with a curved convex surface to adjust the light so that the light meets the initial zone Q1 requirement of the display panel. In this case, since the number of dimming units 301 is sufficient and the light-emitting end of a single dimming unit 301 is relatively small, the light adjustment is more precise. It should be understood that since the initial zone Q1 of the display panel and the number of light-emitting devices are both positively correlated with the number of dimming units 301, the number of dimming units 301 needs to be limited according to the specific situation in practical applications.

[0135] To better illustrate the structure of the dimming assembly 30 according to the embodiments of this disclosure, specific examples will be provided below. It should be noted that in the following examples, the dimming unit 301 is only considered as a square pyramid, i.e., having four sides. For at least some of the dimming units 301, at least one set of opposing sides of each dimming unit 301 forms unequal dihedral angles with its incident light surface. That is, the dihedral angles formed by at least one set of opposing sides of each dimming unit 301 with its incident light surface may be unequal, or the dihedral angles formed by at least one set of opposing sides of some dimming units 301 with its incident light surface may be unequal, while the dihedral angles formed by opposing sides of the remaining dimming units 301 with their incident light surface are equal.

[0136] First example: (Refer to) Figure 19 The dimming assembly 30 includes dimming sections 301 arranged in an array. A lens 303 with a curved convex surface is provided on the light-emitting end side of each dimming section 301, corresponding to the other two sections. A blurring element 302 is formed on the light-emitting surface side of each lens 303. In this example, the lens 303 with the curved convex surface is a non-eccentric lens. The dimming section 301, the lens 303 with the curved convex surface, and the blurring element 302 are integrally formed. Figure 21 This is a schematic diagram of the tilting dimming section combined with a non-eccentric lens according to an embodiment of this disclosure; as shown Figure 21 As shown, the dimming unit 301 is an inclined dimming unit 301, and the lens 303 with an arcuate convex surface is a non-eccentric lens. In this example, the main ray direction of the emitted light from the dimming unit 301 corresponding to different zones of the display panel 20 is different, and the angle of the main ray of the light is adjusted by the dimming unit 301. Figure 21The example of the thickened light beam is a light beam emitted along the direction of the main light beam. The light beam emitted through the dimming unit 301 is focused by a non-eccentric lens so that the light beam is emitted approximately along the direction of the main light beam to provide backlight for the display panel 20. Moreover, in this example, the dimming unit 301, the lens 303 with an arcuate convex surface, and the diffusion element 302 are integrally molded, which can further reduce dispersion and improve light efficiency.

[0137] Furthermore, since the dimming units 301 are arranged in an array, the corresponding lenses 303 with arcuate convex surfaces are also arranged in an array. The first microstructure in the blurring element 302 is a cylindrical lens formed on the light-emitting surface side of the lens 303 with arcuate convex surfaces, arranged side by side along the row direction, and the extension direction of the cylindrical lens has an angle with the column direction, for example, an angle of 3°. The row direction is the row direction in which the dimming units 301 are arranged in an array, and the column direction is the column direction in which the dimming units 301 are arranged in an array. It should be noted that row and column are relative concepts. In this embodiment, the direction in which the number of lenses 303 with arcuate convex surfaces arranged side by side is relatively large is called the row direction, and the direction in which the number of lenses 303 with arcuate convex surfaces arranged side by side is relatively small is called the column direction.

[0138] Furthermore, for ease of description, the row direction is referred to as the first direction, the column direction as the second direction, and the extension direction of the cylindrical lens as the third direction. Figure 22 Three schematic diagrams illustrating how multiple first microstructures adjust light according to embodiments of this disclosure; such as Figure 22 As shown, the scattering element 302 formed on the light-emitting surface side of each lens 303 with an arcuate convex surface can be composed of multiple light-concentrating structures 3021 arranged side by side along the first direction, such as... Figure 22 As shown in (a), it can also be composed of multiple divergent structures 3022 arranged side by side along the first direction, such as Figure 22 As shown in (b), it can also be composed of a light-concentrating structure 3021 and a light-diffusing structure 3022 alternately arranged in the first direction, such as... Figure 22As shown in (c). The light-concentrating structure 3021 includes a light-concentrating surface 3021a for concentrating the light it receives, and a light-diffusing structure 3022 includes a light-diffusing surface 3022a for diverging the light it receives. When the blurring element 302 is composed of focusing structures 3021 arranged side by side along the first direction, the focusing surface 3021a of each focusing structure 3021 forms at least a portion of the light-emitting surface of the lens 303 with an arcuate convex surface; when the blurring element 302 is composed of diverging structures 3022 arranged side by side along the first direction, the diverging surface 3022a of each focusing structure 3021 forms at least a portion of the light-emitting surface of the lens 303 with an arcuate convex surface; when the blurring element 302 is composed of focusing structures 3021 and diverging structures 3022 arranged alternately along the first direction, the focusing surface 3021a of each focusing structure 3021 and the diverging surface 3022a of each diverging structure 3022 forms at least a portion of the light-emitting surface of the lens 303 with an arcuate convex surface.

[0139] For details, please refer to... Figure 22 When light rays are incident on the focusing surface 3021a of the focusing structure 3021, they are focused. On the side of the focal plane S2 of the focusing structure 3021 that is far away from the focusing structure 3021, the light rays gradually diverge. When light rays are incident on the diverging surface 3022a of the diverging structure 3022, they are diverged. On the first plane S1 (the distance between the first plane S1 and the focal plane S2 is greater than or equal to the preset distance d0) on the side of the focal plane S2 that is far away from the dimming part 301, the light rays can achieve a better diffusion effect.

[0140] In this embodiment, the first microstructure diffuses the imaging light, allowing the light spots formed by the light emitted from each pixel of the display panel 20 to be diffused as much as possible into the preset eyebox region 300. This ensures that the observer can see the complete image formed by the display panel 20 from any position within the preset eyebox region 300. Furthermore, the first microstructure is integrated with the lens 303, which has a curved convex surface, into a single structure, thereby simplifying the overall structure of the dimming assembly 30.

[0141] In this example, the first microstructure is a cylindrical lens formed on the light-emitting surface side of lens 303, which has an arcuate convex surface. The extension direction of the cylindrical lens is a third direction, which forms an angle with the second direction, approximately 3°. In this case, the first microstructure mainly diffuses light in the first direction. For example, the first microstructure has a light diffusion angle of ±15°, meaning the diffusion angle of the first microstructure in the first direction is ±15°.

[0142] It should be noted that, from Figure 22As can be seen, for a beam of light incident parallel to the light-emitting surface of the first microstructure, the beam of light will be diverged by the first microstructure in at least one direction. For example, when a single first microstructure is a cylindrical lens and the cylindrical lens extends along the second direction, the cylindrical lens mainly diverges the incident light in the first direction. The maximum offset angle between the main axis of the outgoing light and the incident light in the first direction is the diffusion angle of the light by the first microstructure in the first direction.

[0143] Wherein, when the first microstructure is a cylindrical lens, each first microstructure can be a focusing structure 3021; ​​or, each first microstructure can be a diverging structure 3022; or, a portion of the multiple first microstructures can be focusing structures 3021, and another portion can be diverging structures 3022. Wherein, when multiple first microstructures simultaneously include multiple focusing structures 3021 and multiple diverging structures 3022, the focusing structures 3021 and diverging structures 3022 are arranged alternately in the first direction, so that the light diffusion effect of the dimming component 30 at different positions in the first direction is more uniform. In addition, the light-concentrating structure 3021 and the light-diffusing structure 3022 can be closely arranged, so that the light-emitting surface of the lens 303 with the arc-shaped convex surface forms a smooth wavy surface. This allows the light-emitting surface of the lens 303 with the arc-shaped convex surface to diffuse the light at all positions, and the transition position between the two cylindrical lenses is smoother, thus ensuring that the light can also be reliably adjusted and diffused at the transition position, thereby improving the imaging uniformity of the head-up display device.

[0144] Second example: Figure 23 This is a schematic diagram showing that the dimming unit and the lens with an arcuate convex surface are independently arranged according to an embodiment of the present disclosure; Figure 24 This is a schematic diagram showing the dimming units arranged in an array according to an embodiment of the present disclosure; Figure 25 This is a schematic diagram of a lens array with an arcuate convex surface according to an embodiment of the present disclosure; Figure 26 This is a schematic diagram of the side of the second substrate away from the lens having an arcuate convex surface, according to an embodiment of this disclosure; Figure 27 This is a partial enlarged view of the side of the second substrate away from the lens 303 with the arcuate convex surface, according to an embodiment of the present disclosure; as shown. Figure 23-27 As shown, this example is similar to the one described above. Figure 19The first example differs in that the dimming unit 301 and the lens 303 with a curved convex surface are independently arranged. For example, each lens 303 with a curved convex surface is disposed on the second substrate 305, the dimming unit 301 is formed on the first substrate 304, and the convex surface of the lens 303 with a curved convex surface faces the first substrate 304, allowing a certain gap between them. The lenses 303 with curved convex surfaces are arranged one-to-one with the dimming unit 301. At this time, a diffusion element 302 is formed on the surface of the second substrate 305 away from the lens 303 with a curved convex surface. In this example, the main light direction of the emitted light from the dimming unit 301 corresponding to different zones of the display panel 20 is different. The main light angle of the light is adjusted by the dimming unit 301, and the light emitted through the dimming unit 301 is focused by a non-eccentric lens so that the light is emitted along the main light direction to provide backlight for the display panel 20.

[0145] The lens 303 with an arc-shaped convex surface is very close to the first substrate 304, for example, the distance between the two is 0.1 to 0.5 mm, so as to avoid light loss and improve light efficiency.

[0146] In this embodiment, the length direction of the second substrate 305 is the row direction of the arrangement of the lenses 303 with arcuate convex surfaces, i.e., the first direction, and the width direction is the column direction of the arrangement of the lenses 303 with arcuate convex surfaces, i.e., the second direction. Figure 23 As shown, in some examples, the diffusion element 302 in the third example may include a plurality of first microstructures arranged side by side along a first direction on the surface of the second substrate 305 opposite to the dimming part 301. Each first microstructure extends along a third direction, and the third direction has an angle with the second direction, which is about 3°. The same structure as in the first example can be used for the first microstructure, so it will not be described again here.

[0147] The third example: Figure 28 This is a schematic diagram of the side of the first substrate away from the dimming section, according to an embodiment of this disclosure; as shown Figure 28As shown, this example differs from both the first and second examples. In this example, the dimming assembly 30 does not have a curved convex lens 303; instead, it consists of dimming units 301 arranged in an array and tilted. For example, each dimming unit 301 may employ a light cone structure, and each dimming unit 301 may be disposed on the first substrate 304. The diffusing element 302 is formed on the surface of the first substrate 304 facing away from the dimming unit 301. In this example, the number of dimming units 301 needs to be sufficient so that the light-incident end of the dimming unit 301 is slightly smaller than the light-outceasing end. At this time, the light beam emitted from the light-outceasing surface of the dimming unit can be considered as a beam along the main ray direction, with a small divergence angle along the main ray direction, eliminating the need for a curved convex lens 303 to converge the light. By adjusting the main ray angle of the emitted light from the light-emitting device 1011 through the dimming unit 301, and then diffusing it through the diffusing element 302, the light received by the display panel 20 can be made more uniform. It should be noted that even though there are a large number of dimming units 301 and their arrangement is relatively dense, there is still a certain gap between the light-emitting ends of the dimming units 301 due to manufacturing process considerations. This gap is about 0.2-0.4mm.

[0148] In this embodiment, the length direction of the first substrate 304 is the row direction of the arrangement of the lenses 303 with arcuate convex surfaces, i.e., the first direction, and the width direction is the column direction of the arrangement of the lenses 303 with arcuate convex surfaces, i.e., the second direction. In some examples, the diffusion element 302 in the third example may include a plurality of first microstructures arranged side by side along the first direction on the surface of the second substrate 305 opposite to the dimming part 301. Each first microstructure extends along a third direction, and the third direction forms an angle with the second direction, which is approximately 3°. The same structure as in the first example can be used for the first microstructure, so it will not be repeated here.

[0149] Fourth example: Figure 29 A partial schematic diagram of another exemplary dimming component according to an embodiment of this disclosure; Figure 30 for Figure 29 The diagram shows a partial application of the dimming component in a backlight. Figure 31 This is a schematic diagram of the dimming unit working with an off-center lens; for example... Figures 29-31As shown, the dimming component 30 in this example has an integral structure comprising the dimming unit, the lens 303 with an arcuate convex surface, and the diffusion element 302. The lens 303 with an arcuate convex surface is an off-center lens. The dimming unit 301 and the lens 303 work together to adjust the main ray direction of the light, satisfying the initial partition Q1 requirement of the display panel corresponding to the dimming unit 301. Specifically, the dimming unit 301 pre-adjusts the main ray direction of the light emitted from the light-emitting device 1011 according to the required main ray angle of the initial partition Q1 of the display panel. After the light emitted from the dimming unit 301 passes through the lens 303 with an arcuate convex surface, the lens 303 further adjusts the main ray direction of the received light and focuses the light emitted from the dimming unit 301 so that the light can be projected onto the central area of ​​the head-up display device's eye box.

[0150] like Figure 31 As shown, an eccentric lens is used for lens 303 with a curved convex surface. The angle of the emitted light can be adjusted through the design of the eccentric lens. Specifically, Figure 32 This is a schematic diagram of the directional control principle of an eccentric lens, refer to... Figure 32 Where D is the aperture of the eccentric lens, d is the eccentric distance, f is the focal length, and θ is the eccentric angle, which is determined by the focal length f and the eccentric distance d, and the angle θ = artan(d / f). By designing the focal length f and the eccentric distance d, the angle of the emitted light from the eccentric lens can be controlled.

[0151] The structures in the other examples can all be the same as those in the first example, so they will not be repeated here.

[0152] Fifth example: Figure 33 A partial schematic diagram of another exemplary dimming component according to an embodiment of this disclosure; as shown Figure 33As shown, the dimming assembly 30 comprises a plurality of dimming units 301 and a freeform lens 306 located on the light-emitting surface side of the dimming units. The dimming units 301 are configured to adjust the emitted light of the light-emitting device 1011 according to the principal ray angle required by the initial partition Q1 of the display panel; the freeform lens 306 is configured to converge the emitted light of each dimming unit 301 so that the light can be projected onto the central region 300a of the eye box of the head-up display device. Specifically, when the emitted light from the light-emitting device 1011 illuminates the corresponding dimming unit 301, the dimming unit 301 adjusts the emitted light from the light-emitting device 1011 according to the principal ray angle required by the initial partition Q1 of the corresponding display panel, so that the principal ray angle of the emitted light from the light-emitting device 1011 meets the principal ray angle required by the initial partition Q1 of the display panel, and the overall light converges in the direction of the principal ray angle. The emitted light from each dimming unit 301 is focused by the freeform lens 306 so that the light can be projected onto the central area 300a of the eye box of the head-up display device.

[0153] In some examples, refer to Figure 33 The dimming unit 301 and the freeform lens 306 are integrated into one unit. A diffusion element 302 is formed on the light-emitting surface side of the freeform lens 306. The diffusion element 302 is configured to diffuse the light emitted from the freeform lens 306 so that the light can be projected onto the entire preset eye box area 300. In this way, the viewing range can be expanded, and the observer can see the image presented by the display panel 20 at any position in the preset eye box area 300.

[0154] Furthermore, the dimming unit 301, the freeform lens 306, and the diffusion element 302 can all be integrated into one structure, which can further reduce dispersion and improve light efficiency.

[0155] The dimming unit 301 of this embodiment is arranged in an array, and the diffusion element includes a plurality of first microstructures. The first microstructure in the diffusion element 302 is a cylindrical lens formed on the light-emitting surface side of the freeform lens 306 and arranged side by side along the row direction. The extension direction of the cylindrical lens has an angle with the column direction, for example, the angle is 3°. The row direction is the row direction of the dimming unit 301 in the array, and the column direction is the column direction of the dimming unit 301 in the array.

[0156] It should be noted that, Figure 33 The diagram only illustrates a dimming assembly 30 in which the dimming unit 301 and the freeform lens 306 are an integral structure. In some examples, the dimming unit 301 and the freeform lens 306 in the dimming assembly 30 may also be separate structures with a gap between them. Figure 34 This is a schematic diagram showing that the dimming unit and the freeform lens are independently configured according to an embodiment of the present disclosure, as shown below. Figure 34As shown, the dimming unit 301 and the freeform lens 306 in the dimming assembly 30 can also be separate structures, with the freeform surface of the freeform lens 306 serving as the light-emitting surface. Of course, the flat surface of the freeform lens 306 can also be used as the light-emitting surface.

[0157] The above are several exemplary structures of the dimming assembly 30, and these structures do not constitute a limitation on the scope of protection of the embodiments disclosed herein. In some examples, the dimming part 301 may be made of silicone, COC, or COP material, and the lens 303 with an arcuate convex surface may be made of silicone or plastic PC material. When the dimming part 301 and the lens 303 with an arcuate convex surface are an integral structure, both may be made of silicone material, which facilitates manufacturing.

[0158] In some examples, the outer contour of the light-incident end of the dimming unit 301 can be either rectangular or circular. For example, when the light-incident surface of the dimming unit 301 is circular and the light-exit surface is rectangular, the circular light-incident surface to the rectangular light-exit surface can be formed by a lofting method. When the light-incident surface is circular, the area of ​​the light-incident port can be relatively large, which is easier to implement in the manufacturing process.

[0159] In some examples, the light-incident end of the dimming unit 301 can be a plane or a freeform surface. By rationally designing the light-incident end of the dimming unit 301, the light efficiency can be improved and the light loss can be reduced.

[0160] In some examples, the light-emitting device 1011 may specifically be an electroluminescent element, such as a light-emitting diode (LED), an organic light-emitting diode (OLED), a mini light-emitting diode (MiniLED), a micro light-emitting diode (MicroLED), a cold cathode fluorescent lamp (CCFL), an electroluminescent display (ELD), a cold LED light source (CLL), an electroluminescent (EL), a field emission display (FED), a halogen tungsten lamp, or a metal halide lamp, etc., and this common embodiment does not limit it.

[0161] In some examples, one light-emitting device 1011 may be correspondingly configured with one dimming unit 301, or multiple light-emitting devices 1011 arranged in an array may correspond to one dimming unit 301. In the embodiments of this disclosure, due to the limitations of the manufacturing process of the dimming unit 301, it is preferable to design the main ray direction of the emitted light from the dimming unit 301 according to the requirements of the initial partition Q1 of the display panel for the main ray direction of light. The arrangement of the light-emitting devices 1011 is designed after the dimming unit 301 is designed. Therefore, the light-emitting devices 1011 can be arranged regularly or irregularly. Of course, in some examples, the light-emitting devices 1011 can be arranged regularly, such as in an array, and then the dimming unit 301 is designed according to the arrangement of the light-emitting devices 1011 and the requirements of the initial partition Q1 of the display panel for the main ray direction of light.

[0162] In some examples, the light-emitting devices 1011 in the light source are on the same horizontal plane and opposite to the light-incident end of the dimming unit 301. This helps to homogenize the light and also reduces the thickness of the backlight 10.

[0163] In some examples, the distance between the light-emitting device 1011 and the corresponding dimming part 301 is 0.1-0.4 mm, which means that the distance between the light-emitting device 1011 and the dimming part 301 is very small, thus improving the light utilization rate and reducing light loss.

[0164] In some examples, the light-emitting devices 1011 in the light source are mounted on a printed circuit board 1012, and the surface of the printed circuit board 1012 on which the light-emitting devices 1011 are mounted is coated with white ink. The white ink can protect the printed circuit board 1012, prevent it from being chemically corroded, and improve its service life.

[0165] In some examples, Figure 35 This is a schematic diagram of a backlight source according to an embodiment of the present disclosure; as shown Figure 35 As shown, the backlight also includes a homogenization and diffraction element 40, which is disposed between the dimming assembly 30 and the display panel 10 to homogenize the received light. The homogenization and diffraction element 40 may include multiple homogenization structures, which are used to scatter and / or diffract the light, thereby achieving light dispersion. The size of the homogenization structure is less than 1 micrometer, thus making the imaging brightness of the display panel more uniform.

[0166] The homogenizing and dispersing element 40 can specifically be a scattering optical element, such as a homogenizer or diffuser; the homogenizing structure is the scattering particles in the scattering optical element. Alternatively, the homogenizing and dispersing element can be a diffractive optical element (DOE) with good control over the diffusion effect. In this case, when light passes through a homogenizer or other scattering optical element, it will be scattered, transmitted to many different angles, and a small amount of diffraction will also occur, but scattering plays the main role. Diffractive optical elements, by designing specific microstructures on their surface, mainly play a role in beam expansion through diffraction, forming a controllable light spot size and shape.

[0167] Figure 36 This is a schematic diagram of an image source according to a disclosed embodiment; as shown Figure 36 As shown, this embodiment of the present disclosure provides an image source, which includes a backlight 10 and a display panel 20 located on the light-emitting surface side of the backlight 10. The backlight 10 can be the backlight 10 described above.

[0168] Figure 37 This is a schematic diagram of the structure of a head-up display device according to an embodiment of this disclosure; as shown Figure 37 As shown, this disclosure provides a head-up display device, which includes an image source 100 and a reflective imaging element 500 as described in the above example. The reflective imaging element 500 is configured to receive image light output from the image source 100 and output the image light to a preset configuration 300. The controller is configured to determine at least one of a plurality of initial partitions Q1 as a target initial partition based on the content of the screen to be displayed on the head-up display device, and to provide a driving signal to the driving circuit connected to the light-emitting device 1011 in the target initial partition to control the light-emitting device 1011 to emit light.

[0169] In some examples, the controller is specifically used to acquire the image to be displayed by the head-up display device. This image can be the image represented by the video image signal transmitted to the image source in the head-up display device, that is, the image to be displayed on the display panel 20 in the image source 100. The image to be displayed includes image content, that is, the content to be displayed. Since the image content usually does not fill the entire screen, that is, the content to be displayed only exists in a part of the image, the initial partition Q1 of the display panel corresponding to the image content is determined. This initial partition Q1 is used to display the aforementioned content to be displayed. That is, when the image to be displayed is displayed on the display panel 20, only the initial partition Q1 displays the image content, and other areas do not display the image content.

[0170] Furthermore, the content to be displayed on the display panel 20 may include phone numbers, vehicle speed information, speed limit information, music information, navigation information, etc., all of which can be referred to as elements. For example, phone numbers, vehicle speed information, speed limit information, and music information can be used as one area of ​​the display panel, while navigation information occupies the remaining space on the display panel, i.e., as another area of ​​the display panel. In other words, the display panel can be divided into multiple element partitions Q2 according to the elements displayed. Each element partition Q2 includes at least one initial partition Q1, and the light-emitting devices corresponding to the element partitions Q2 are electrically connected to the same driving circuit. In this case, the controller is specifically configured to determine at least one of the element partitions Q2 as a target element partition based on the content to be displayed on the head-up display device, obtain the initial element partition Q1 in the target element partition, and use the initial element partition in the target element partition as the target initial element partition. A driving signal is then provided to the driving circuit connected to the light-emitting device 1011 in the target initial partition to control the light-emitting device 1011 to emit light.

[0171] This embodiment of the disclosure determines the initial partition Q1 of the display panel corresponding to the content of the image to be displayed in the head-up display device; controls the light-emitting device 1011 in the backlight 10 corresponding to the initial partition Q1 to be turned on, and controls the light-emitting devices 1011 in other positions of the backlight 10 to be turned off, thereby realizing local backlight control of the backlight 10, turning on only some of the light-emitting devices 1011, reducing the backlight power consumption of the head-up display device, improving the service life of the display panel, improving the light utilization rate of the backlight, improving driving safety, and enhancing the user's driving experience.

[0172] In this system, while controlling the backlight 10 to turn on the light-emitting elements in certain locations of the control display panel (including at least one initial partition Q1), and turning off the light-emitting elements in the backlight 10 in other locations, the display panel displays the image to be displayed and emits image light. The image light is reflected by the magnification component (e.g., a curved reflector) and the reflective imaging unit (e.g., the windshield of a vehicle) in the head-up display device and reaches the preset eye box area 300. When the user's eyes are within the preset eye box area 300, they can see a virtual image located in front of the windshield. This virtual image is a magnified version of the image currently displayed on the display panel. Because only the light-emitting elements in the backlight 10 corresponding to the image content are turned on, and the other light-emitting elements are turned off, the contrast of the virtual image projected by the head-up display device is improved.

[0173] In some embodiments, such as Figure 37As shown, the head-up display device may further include a housing 600, within which the image source 100 and the reflective imaging element 500 are located, thereby protecting the image source 100 and the reflective imaging element 500. The housing 600 has an opening 601 to allow image light to exit.

[0174] In some embodiments, the reflective imaging element 500 may include a magnifying element 501, which enables the head-up display device to have a greater imaging distance and a larger imaging size. For example, the imaging distance and imaging size can be changed by altering the magnification of the magnifying element 501. The magnification can be changed by adjusting parameters such as the curvature of the magnifying element 501.

[0175] In some embodiments, the magnifying element 501 can be a curved mirror, optionally a concave mirror, that is, a mirror with a concave curved reflective surface. When the curved mirror is a concave mirror, if the optical distance between the image source 100 and the concave mirror is less than the focal length of the concave mirror, the concave mirror forms an upright, magnified virtual image based on the image output from the image source 100. For example, according to the imaging properties of a concave mirror, when the optical distance between the image source 100 and the concave mirror is less than the focal length of the concave mirror (i.e., the image source 100 is within one focal length of the concave mirror), the image distance of the concave mirror increases as the optical distance between the image source 100 and the concave mirror increases. In other words, the greater the optical distance between the image source 100 and the concave mirror, the greater the distance between the observer and the virtual image 400 they observe.

[0176] Optionally, the curved mirror is a free-form mirror, that is, a mirror with a free-form surface, or a surface that does not have rotational symmetry, in order to improve the imaging quality of the head-up display device.

[0177] In some alternative embodiments, the amplification element 501 may be an optical waveguide or a holographic optical element.

[0178] like Figure 37 As shown, the reflective imaging element 500 is not limited to only including the magnifying element 501, but may also include a plane mirror 502, which adjusts the optical path of the image light propagation, thereby reducing the size of the head-up display device.

[0179] This disclosure also provides a vehicle that includes the head-up display and windshield 200 described in the above embodiments. Figure 38 This disclosure provides schematic diagrams of some examples of head-up display devices and windshields; such as Figure 38As shown, the windshield 200 is used to reflect the image light emitted from the head-up display device to a preset eye-box area 300. The windshield 200 has a semi-transparent, semi-reflective characteristic, allowing the image light emitted from the head-up display device to be reflected to the preset eye-box area 300. Simultaneously, light from outside the vehicle can also pass through the windshield 200 to reach the preset eye-box area 300, so that when the observer's eyes are located in the preset eye-box area 300, they can simultaneously see the image formed by the head-up display device and the scenery outside the vehicle. In this embodiment, "semi-transparent, semi-reflective" means that the windshield 200 can both transmit and reflect light, and is not limited to transmitting 50% and reflecting 50%. For example, the transmittance of visible light is greater than or equal to 70%.

[0180] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A backlight for use in a heads-up display device, the backlight comprising: The application relates to a head-up display device. The head-up display device comprises a light source, a plurality of light modulation units, a plurality of heat conduction units and a heat dissipation unit. The light source comprises a plurality of light emitting units, each of which comprises one or more light emitting devices. The plurality of light modulation units are arranged one by one corresponding to the plurality of light emitting units and are located on the light emitting surface side of the light emitting devices.

2. The backlight of claim 1, wherein, The cross-sectional area of the light modulation unit monotonously increases along the direction from the light inlet end to the light outlet end. The light modulation unit is configured to correspond to different initial partitions of the display panel of the head-up display device and adjust the emitted light rays of the light emitting device received thereby.

3. The backlight of claim 2, wherein, The heat conduction unit comprises a plurality of heat conduction units.

4. The backlight of claim 1, wherein, The heat conduction unit at least wraps the end of the light modulation unit corresponding thereto close to the light emitting device.

5. The backlight of claim 1, wherein, The heat dissipation unit is connected with the heat conduction unit and is used for releasing the heat conducted by the heat conduction unit. The heat dissipation unit comprises at least one heat dissipation unit connected with at least one side of the heat conduction unit.

6. The backlight of claim 1, wherein, The heat dissipation unit comprises a plurality of fins arranged at intervals. The heat conduction unit has oppositely arranged first and second openings. The second opening is closer to the light source than the first opening.

7. The backlight of claim 5 or 6, wherein, The second opening and the light emitting device corresponding thereto are opposite to each other and are used for transmitting the emitted light rays of the light emitting device corresponding thereto.

8. The backlight of claim 5 or 6, wherein, The heat conduction unit only wraps the end of the light modulation unit corresponding thereto close to the light emitting device.

9. The backlight of claim 8, wherein, The heat conduction unit further comprises a vapor chamber.

10. The backlight of claim 9, wherein, The vapor chamber has a plurality of first accommodating units penetrating along the thickness direction thereof. The first accommodating unit is used as the heat conduction unit. The heat conduction unit is closer to the light source than the vapor chamber. The vapor chamber has a plurality of first accommodating units penetrating along the thickness direction thereof. The heat conduction unit has a plurality of second accommodating units penetrating along the thickness direction thereof. The first and second accommodating units are connected one by one to form a plurality of accommodation spaces. The accommodation space is used for wrapping the end of the light modulation unit corresponding thereto close to the light emitting device. The light modulation unit is a transparent solid prism-shaped medium surrounded by a plurality of reflecting surfaces capable of totally reflecting light rays. The light modulation unit is a prism-shaped cavity surrounded by a plurality of reflecting surfaces capable of reflecting light rays. The plurality of light modulation units are composed of a first part and a second part arranged one by one along the direction away from the light emitting surface of the light source. The first part is provided with a plurality of first segments of the prism-shaped cavity. The second part is provided with a plurality of second segments of the prism-shaped cavity. The first and second segments correspond to each other and jointly form the complete plurality of prism-shaped cavities. The first part further comprises a first fixed plate. The second part further comprises a second fixed plate. The first and second fixed plates are connected. The heat-conducting part is arranged one-to-one corresponding to the first segment, and the heat-distribution plate is fixed to the first fixed plate.

11. The backlight of claim 1, wherein, The heat-conducting part wraps the entire outer wall of the light-adjusting part, and each heat-conducting part is connected as an integral structure.

12. The backlight of claim 11, wherein, The heat-conducting parts are connected without gaps.

13. The backlight of claim 11, wherein, The outer contour of the heat-conducting part is matched with the outer contour of the corresponding light-adjusting part, and the end part of each heat-conducting part is arranged in a spaced manner.

14. The backlight of claim 11, wherein, The light-adjusting part is a transparent solid prism-shaped medium surrounded by a plurality of reflection surfaces capable of totally reflecting light.

15. The backlight of claim 11, wherein, The light-adjusting part is a prism-shaped cavity at least partially surrounded by a plurality of reflection surfaces capable of reflecting light.

16. The backlight of any of claims 1-6, 11, wherein, The main light direction of the outgoing light of each light-adjusting part is the same. Or, The main light direction of the outgoing light in each light-adjusting part is different, so that the outgoing light can be projected to the eyebox center area of the head-up display device.

17. A head-up display device, characterized by Comprise: An image source comprising the backlight source of any one of claims 1-16; A display panel arranged on the light-emitting side of the backlight source and configured to convert the light of the backlight source into image light; A reflective imaging element configured to receive the image light and output the image light to a preset eyebox area of the head-up display device.

Images