Dimming assembly, backlight source and image source

Abstract

The utility model provides a dimming assembly, a backlight source and an image source, and belongs to the technical field of optical imaging. The dimming assembly is applied to a backlight source of a head-up display device, and comprises a plurality of light cones which are located on the light-emitting surface sides of a plurality of light-emitting devices and are arranged opposite to the light-emitting devices one by one; the cross sectional area of the light cone is monotonically increased along the direction from the light incident surface to the light emergent surface, and the light cone is configured to correspond to different partitions of a display panel of the head-up display equipment and adjust the received emergent light of a light emitting device; the positioning plate is provided with a plurality of positioning holes, the light cones and the positioning holes are arranged in a one-to-one correspondence mode, and the outer contours of the light incident faces of the light cones are fixed to the inner walls of the corresponding positioning holes.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical imaging, and in particular relates to a dimming component, a backlight source and an image source. Background Art

[0002] Head up display (HUD) technology is a technology that uses the principle of optical reflection to project the light emitted by the image source onto an imaging window (imaging board, windshield, etc.), and then reflects it into the eye box through the imaging window to form a virtual image. The virtual image can display the desired information, such as driving-related information such as vehicle speed, to avoid distraction caused by the driver looking down at the dashboard during driving, thereby improving driving safety and providing a better driving experience. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art, and provides a dimming component, a backlight source and an image source.

[0004] The embodiment of the present disclosure provides a dimming component, which is applied to a backlight source of a head-up display device, including:

[0005] A plurality of light cones are located on the light emitting surface side of the plurality of light emitting devices and are arranged one by one with the light emitting devices; the cross-sectional area of ​​the light cones increases monotonically along the direction from the light incident surface to the light emitting surface; the light cones are configured to correspond to different partitions of the display panel of the head-up display device and adjust the emitted light of the light emitting device received by the light cones;

[0006] The positioning plate has a plurality of positioning holes, the light cones are arranged in one-to-one correspondence with the positioning holes, and the outer contour of the light incident surface of the light cone is fixed on the inner wall of the corresponding positioning hole.

[0007] In some examples, only the outer contour of the light incident surface of the light cone is at least partially in contact with the inner wall of the corresponding positioning hole.

[0008] In some examples, the inner wall of the positioning hole is covered with a reflective film, which is configured to reflect the emitted light of the light-emitting device received therein to a light cone corresponding to the positioning hole.

[0009] In some examples, the aperture of the positioning hole decreases monotonically from the direction from the light exiting surface of the light cone to the light incident surface thereof.

[0010] In some examples, the positioning plate also includes mounting holes corresponding one to one with the positioning holes, and the mounting holes are connected to the corresponding positioning holes, the mounting holes are used to accommodate the light-emitting devices, and when the light-emitting devices are installed in the mounting holes, there is a certain distance between the light-emitting devices and the incident surface of the corresponding light cone.

[0011] In some examples, the dimming component further includes a first substrate disposed on a light emitting surface of each of the light cones;

[0012] The supporting assembly is arranged in the first substrate so that the light emitting surfaces of the light cones are on the same horizontal plane.

[0013] In some examples, an orthographic projection of the support assembly on the plane where the first substrate is located covers an orthographic projection of each of the light cones on the plane where the first substrate is located.

[0014] In some examples, the first substrate, the light cone, and the support assembly are an integrally formed structure and are injection molded parts.

[0015] In some examples, the support component is made of glass.

[0016] In some examples, the main ray directions of the outgoing rays of each of the light cones are the same;

[0017] or,

[0018] The main light directions of the outgoing light rays in each of the light cones are different, so that the outgoing light rays can be projected to the center area of ​​the eye box of the head-up display device.

[0019] In some examples, the light incident surface of the light cone is any one of a curved surface, a plane, or a free-form surface that is convex away from the light emitting surface thereof.

[0020] In some examples, the dimming component further includes a lens structure disposed on a light-emitting surface side of the light cone and configured to adjust the emitted light of the light cone.

[0021] In some examples, the lens structure and the light cone are an integrally formed structure; or,

[0022] The lens structure and the light cone are separate structures, and there is a gap between them.

[0023] In some examples, the lens structure adopts any of the following:

[0024] A lens array consisting of a plurality of eccentric lenses;

[0025] A lens array consisting of a plurality of non-decentered lenses;

[0026] Free-form lens.

[0027] The present disclosure provides a backlight source, including:

[0028] A light source, comprising a plurality of light emitting devices, wherein each of the light emitting devices is located in the same horizontal plane;

[0029] The dimming component is arranged on the light-emitting surface side of the corresponding light-emitting device and is configured to adjust the emission direction of the emitted light of the light-emitting device; the dimming component adopts any of the dimming components described above.

[0030] In some examples, the light source further includes a printed circuit board, and the light emitting device is mounted on the printed circuit board;

[0031] The positioning plate is attached to the surface of the printed circuit board on which the light emitting device is mounted.

[0032] The present disclosure provides an image source in a head-up display device, including:

[0033] Backlight source;

[0034] A display panel is arranged on the light-emitting side of the backlight source, and is used to convert the light of the backlight source into image light and then output it to a preset area; wherein,

[0035] The backlight source adopts any of the backlight sources described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the application of the head-up display device provided in some examples.

[0037] Figure 2 Schematic diagram of application of head-up display devices provided in other examples.

[0038] Figure 3 It is a schematic diagram of an ideal state in which the dimming component according to an embodiment of the present disclosure is applied in a backlight source.

[0039] Figure 4 It is a schematic diagram of the actual state of the dimming component of the embodiment of the present disclosure being applied in the backlight source.

[0040] Figure 5 It is a schematic diagram of a dimming component according to an embodiment of the present disclosure being applied in a backlight source.

[0041] Figure 6 It is a partial schematic diagram of the fixing plate of the embodiment of the present disclosure.

[0042] Figure 7 It is a partial schematic diagram of the light emitting device in accordance with an embodiment of the present disclosure cooperating with a fixing plate.

[0043] Figure 8 A schematic diagram of a dimming component in an embodiment of the present disclosure being applied to a backlight source.

[0044] Fig. 9 Schematic diagram of an upright light cone according to an embodiment of the present disclosure.

[0045] Fig.10 A schematic diagram of an illumination area formed by a dimming component according to an embodiment of the present disclosure.

[0046] Fig.11 A schematic diagram of another illumination area formed by the dimming component of an embodiment of the present disclosure.

[0047] Fig.12 A schematic diagram of an exemplary dimming component according to an embodiment of the present disclosure.

[0048] Fig.13 for Fig.12 A partial enlarged view of the light-emitting surface of the lens of the dimming component having an arc-shaped convex surface.

[0049] Fig.14 It is a schematic diagram of the structure of the inclined light cone in the embodiment of the present disclosure in combination with a non-decentered lens.

[0050] Fig.15 Three schematic diagrams of light adjustment by multiple first microstructures provided in the embodiments of the present disclosure.

[0051] Fig.16 This is a schematic diagram of the light cone and the lens with a curved convex surface being independently arranged according to an embodiment of the present disclosure.

[0052] Fig.17 It is a schematic diagram of light cones arranged in an array according to an embodiment of the present disclosure.

[0053] Fig.18 Schematic diagram of a lens array according to an embodiment of the present disclosure.

[0054] Fig.19 It is a schematic diagram of a side of a second substrate away from a lens having an arc-shaped convex surface according to an embodiment of the present disclosure.

[0055] Fig. 20 This is a partial enlarged view of a dispersing element according to an embodiment of the present disclosure formed on a side of a second substrate away from a lens having an arc-shaped convex surface.

[0056] Fig.21 It is a schematic diagram of a side of the first substrate away from the light cone according to an embodiment of the present disclosure.

[0057] Fig. 22 It is a partial schematic diagram of another exemplary dimming component of an embodiment of the present disclosure.

[0058] Fig.23 for Fig. 22 The dimming component shown is a partial schematic diagram applied to a backlight source.

[0059] Fig.24 Schematic diagram of the light cone with an eccentric lens.

[0060] Fig.25 This is the principle diagram of direction control of eccentric lens.

[0061] Fig.26 It is a partial schematic diagram of another exemplary dimming component of an embodiment of the present disclosure.

[0062] Fig. 27 This is a schematic diagram of the independent arrangement of the light cone and the free-form surface lens in an embodiment of the present disclosure.

[0063] Fig.28 Another schematic diagram of the dimming component of the embodiment of the present disclosure being applied to a backlight source.

[0064] Fig.29 It is a schematic diagram of a backlight source according to an embodiment of the present disclosure.

[0065] Fig.30 A schematic diagram of an image source according to a disclosed embodiment.

[0066] Fig.31 A schematic diagram of another image source of the disclosed embodiment.

[0067] Fig.32 It is a schematic diagram of the structure of a head-up display device according to an embodiment of the present disclosure.

[0068] Fig.33 Schematic diagrams of head-up display devices and windshields according to some examples of the present disclosure. DETAILED DESCRIPTION

[0069] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0070] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0071] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, the words "include" or "comprise" and the like mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0072] As used herein, "parallel" and "perpendicular" include the described situation and the situation similar to the described situation, and the range of the similar situation is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the error associated with the measurement of a specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°.

[0073] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0074] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0075] Figure 1 Schematic diagram of the application of head-up display devices provided in some examples. The head-up display devices can be installed on vehicles and other transportation tools. Figure 1As shown, the head-up display device includes an image source 100 for outputting image light, the image source 100 includes a backlight source 10 and a display panel 20 arranged on the light-emitting side of the backlight source 10. For example, the display panel 20 is a liquid crystal display panel, and the display panel 20 includes a plurality of pixel units, each of which includes a plurality of pixels. For example, each pixel unit includes a red pixel, a green pixel and a blue pixel; for another example, each pixel unit includes a red pixel, a green pixel, a blue pixel and a white pixel. The display panel 20 is used to convert the light of the backlight source 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 in the eye box area 300, the image formed by the image light can be seen. At this time, the observer sees a virtual image 400 formed by the windshield 200 in a reflective imaging manner. Among them, the observer can be a driver or a passenger, and the observer can obtain the required vehicle information, such as driving speed, fuel consumption, etc., from the virtual image 400 in front of the line of sight, or other information, such as the image of a virtual rearview mirror or the image of audio and video entertainment.

[0076] The eyebox area 300 of the head-up display device specifically refers to the area where the eyes of the observer are located and the image output by the head-up display device can be seen. The eyebox area 300 has a certain size, and even if the eyes of the observer deviate a certain distance from the center of the eyebox area 300, such as a certain distance in the up-down or left-right direction, as long as they are still within the eyebox area 300, they can see the image output by the head-up display device.

[0077] Figure 2 It is a schematic diagram of the application of the head-up display device provided in some other examples; Figure 2 As shown, the backlight source 10 includes a light source 101, a converging element 102 and a light angle control element 103. Among them, the light source 101 may include a plurality of 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 outgoing light of the light-emitting device is converged and collimated by the lens and then irradiated to the direction control film, and the main light direction, divergence angle, etc. of the light are further adjusted by the direction control film, and then the light is diffused by the diffusion element to provide backlight for the display panel. Among them, after the light is adjusted by the direction control film, the main light of the outgoing light of each pixel of the display panel can be directed to the central area 300a of the eye box.

[0078] It should be noted that the eye box central area 300a is a small area covering the geometric center of the eye box area 300. For example, the center of the eye box central area 300a coincides with the center of the eye box area 300. The shapes of the eye box central area 300a and the eye box area 300 may be the same or different.

[0079] The inventors have found that after the light emitted by the light emitting device is homogenized by multiple components, the backlight efficiency is low and there is a dispersion problem.

[0080] In view of the above technical problems, the present disclosure provides a dimming component. Figure 3 Schematic diagram of an ideal state in which the dimming component of the embodiment of the present disclosure is applied to a backlight source; Figure 3 As shown, the embodiment of the present disclosure provides a dimming component 30, which can be arranged between the display panel 20 of the head-up display device and the light-emitting device 1011 of the backlight source, and is used to adjust the outgoing light of the light-emitting device 1011. The dimming component 30 includes a first substrate 304 and a plurality of light cones 301 arranged on the first substrate 304. Among them, for each light cone 301, its cross-sectional area increases monotonically along the direction from its light incident surface to the light emitting surface. The light cone 301 is configured to adjust the main light of the outgoing light of the light-emitting device 1011 received by it, so that the light can finally be projected to the center area of ​​the eye box of the head-up display device.

[0081] Among them, each light cone 301 can be an upright light cone, that is, the main light direction of the outgoing light of each light cone 301 is the same; the upright light cone is configured to converge the light of the corresponding light-emitting device. Of course, at least part of each light cone 301 can also be an inclined light cone, that is, the main light direction of the outgoing light of at least part of the light cones 301 is different. The inclined light cone is configured to adjust the main light of the outgoing light of the light-emitting device 1011 according to the main light angle required for the partition of the display panel 20. In the embodiment of the present disclosure, whether all light cones 301 use upright light cones or at least part of them use inclined light cones, as long as the outgoing light of the light-emitting device 1011 adjusted by the light cone 301 can be projected to the center area of ​​the eye box of the head-up display device, it is within the protection scope of the embodiment of the present disclosure.

[0082] Among them, Figure 3 Each light emitting device 1011 is in the same horizontal plane, the light incident surface of each light cone 301 is in the same horizontal plane, and the light emitting surface of the light emitting device 1011 and the light incident surface of the light cone are arranged in parallel; the light emitting surface of each light cone 301 is in the same horizontal plane, and is arranged parallel to the display surface of the display panel. In this case, the light emitting surface of the light emitting device 1011, the light incident surface and the light emitting surface of the light cone 301, and the display surface of the display panel 20 are all arranged in parallel. Of course, in actual applications, according to actual needs, the light incident surface of the light emitting device 1011 and the display surface of the display panel 20 may also form a certain angle. It should be noted that in the embodiment disclosed herein, the light emitting device 1011 is fixed on a horizontal light board (printed circuit board 1012) so that each light emitting device 1011 is in the same horizontal plane.

[0083] The inventors found that the light-emitting surface of each light cone 301 is formed on the first substrate 304 to form a light cone array. The material of the light cone array is silicone, which has a low hardness. When the size of the light cone array is large, the light-emitting surface side of the light cone 301 may collapse, and the light-entering surface side may be offset relative to the light-emitting device 1011. Figure 4 As shown, due to the deviation in the alignment between the light cone 301 and the corresponding light emitting device 1011, the light collection efficiency of the light cone 301 for the corresponding light emitting device 1011 is reduced, thereby reducing the brightness of the head-up display device.

[0084] In view of the above problems, the embodiments of the present disclosure provide the following technical solutions:

[0085] The embodiment of the present disclosure provides a dimming component 30, which can be disposed between the display panel 20 of the head-up display device and the light emitting device 1011 of the backlight source, and is used to adjust the emitted light of the light emitting device 1011. The dimming component 30 includes a plurality of light cones 301 and a positioning plate 70.

[0086] For each light cone 301, its cross-sectional area increases monotonically along the direction from its light incident surface to the light emitting surface, and the light cone 301 can be arranged one by one with the light emitting device 1011. The light cone 301 is configured to correspond to different partitions of the display panel 20 of the head-up display device, and adjusts the main light of the emitted light of the light emitting device 1011 received by it.

[0087] The positioning plate 70 has a plurality of positioning holes 701, and the positioning holes 701 are arranged one by one corresponding to the light cones 301, and the outer contour of the light incident surface of the light cone 301 is fixed on the inner wall of the corresponding positioning hole 701. The light cone 301 is fixed by the positioning holes 701 to prevent the light incident surface of the light cone 301 and the corresponding light emitting device 1011 from being offset, thereby avoiding the problem of reduced brightness of the head-up display device.

[0088] In some examples, only the outer contour of the light incident surface of the light cone 301 is at least partially in contact with the inner wall of the corresponding positioning hole 701. For example, the light contour of the light incident surface of the light cone 301 is stuck to the inner wall of the positioning hole 701, so that the light cone and the positioning hole 701 are fixedly connected. In the embodiment of the present disclosure, only the outer contour of the light cone 301 is in contact with the inner wall of the positioning hole 701, thereby avoiding the side of the light cone 301 from contacting the positioning hole 701, causing the outgoing light of the light emitting device 1011 to irradiate the contact interface between the two and cause full emission, resulting in light loss, thereby improving light utilization.

[0089] In one example, the aperture of the positioning hole 701 decreases monotonically from the light exit surface of the light cone 301 to its light entrance surface. In other words, the positioning hole 701 is in an inverted trapezoidal shape along the longitudinal section (a section perpendicular to the plane of the first substrate 304). This arrangement ensures that only the outline of the light entrance surface of the light cone 301 contacts the inner wall of the positioning hole 701.

[0090] In some examples, such as Figure 6 and 7 As shown, the inner wall of the positioning hole 701 is covered with a reflective film 80, and the reflective film 80 is configured to reflect the emitted light of the light emitting device 1011 received by it to the light cone corresponding to the positioning hole 701. Specifically, a high-reflectivity film layer, such as aluminum plating, is plated on the inner wall of the positioning hole 701 using a coating process including but not limited to coating, so that the large-angle light emitted by the light emitting device 1011 is reflected into the light cone 301 through the emission film, thereby improving the light collection efficiency of the light cone.

[0091] In some examples, continue to refer to Figure 6 and 7 , the positioning plate 70 not only includes the positioning holes 701, but also the mounting holes 702 which are arranged in a one-to-one correspondence with the positioning holes 701, and the mounting holes 702 are connected to the corresponding positioning holes 701. Among them, the mounting holes 702 are used to accommodate the light-emitting device 1011, and when the light-emitting device 1011 is installed in the mounting holes 702, there is a certain distance between the light-emitting device 1011 and the light incident surface of the corresponding light cone 301. In this way, the light-emitting device 1011 and the light cone 301 can be accurately aligned to improve the utilization rate of light. When the dimming component 30 in the embodiment of the present disclosure is applied to a backlight source, the positioning plate 70 can contact the surface of the printed circuit board 1012 on which the light-emitting device 1011 is installed.

[0092] Furthermore, the material of the positioning plate 70 can be metal. While fixing the light cone 301, the metal material can also dissipate heat for the light source (light board) composed of the light emitting device 1011 and the printed circuit board 1012.

[0093] In some examples, due to the large size of the light cone array, the light exiting surface of the light cone array is prone to collapse, such as Figure 8 As shown, in the embodiment of the present disclosure, the support component 90 is embedded in the first substrate 304 so that the light exit surfaces of each light cone 301 are on the same horizontal plane. By embedding the support component 90 in the first substrate 304, it is possible to prevent the light exit surface side of the light cone array from collapsing easily, thereby avoiding the problem of the light incident surface of the light cone 301 being offset and deviating from the light emitting device 1011.

[0094] Furthermore, the support assembly 90 may be made of glass, or other transparent materials. Furthermore, the orthographic projection of the support assembly 90 on the plane where the first substrate 304 is located covers the orthographic projection of each light cone 301 on the plane where the first substrate 304 is located, so as to provide sufficient support for the light cone 301 .

[0095] In some examples, in order to enable the image formed by the display panel 20 to be effectively projected on the reflective imaging device, different partitions of the display panel 20 require light with different chief ray angles. In the embodiment of the present disclosure, the chief ray of the outgoing light of the light cone 301 is set according to the different partitions of the display panel 20, so that the chief ray of the light emitted by the light-emitting device 1011 through the light cone 301 meets the requirements of its corresponding display panel partition. The adjustment of the chief ray of the outgoing light of the light cone 301 can be achieved by adjusting the inclination angle of the light cone 301. Among them, the inclination angle of the light cone 301 refers to the angle formed by the connection between the center of the light incident surface and the center of the light exit surface of the light cone 301 and the horizontal plane. In other words, the adjustment of the chief ray of the outgoing light of the light cone 301 can be achieved by the angle formed by the line connecting the center of the light incident surface and the center of the light exit surface of the light cone 301 and the horizontal plane. The partitions of the display panel 20 refer to multiple areas divided by the display area of ​​the display panel 20, and at least one pixel is distributed in each partition. In actual applications, parameters such as the number, shape, size and arrangement of the partitions of the display panel 20 can be set according to specific needs.

[0096] Furthermore, in one example, the light incident surface and the light emitting surface of each light cone 301 are arranged in parallel, and the shape and size (e.g., area) of the light incident surface of each light cone 301 are equal, and the shape and size (e.g., area) of the light emitting surface of each light cone 301 are equal, and the adjustment of the inclination angle of the light cone 301 can be achieved by adjusting the relative position of the light incident surface and the light emitting surface of each light cone 301 to adjust the relative position of the center of the light incident surface and the center of the light emitting surface. Of course, the adjustment of the inclination angle of the light cone 301 is not limited to this, and can also be achieved by adjusting the area size of the light incident surface and / or the light emitting surface of the light cone 301, etc., which will not be listed one by one here.

[0097] The dimming component 30 provided in the embodiment of the present disclosure includes a light cone 301 capable of adjusting the main light according to the partition of the display panel, and a diffusion element 302 for diffusing the outgoing light of the light cone 301. At this time, the outgoing light of the light emitting device 1011, after passing through the light cone 301 and the diffusion element 302, serves as the backlight of the display panel 20, so that the display panel 20 can form an image normally, and when forming an image, the image light is reflected by a reflective imaging device (such as a windshield of a vehicle) and reaches the eye box area, so that the viewer can view the image formed by the display panel 20 at any position in the eye box area. The dimming component 30 in the embodiment of the present disclosure can adjust the backlight light only by the cooperation of the light cone 301 and the diffusion element 302, which can greatly improve the light efficiency and reduce the dispersion.

[0098] In some examples, such as Fig. 9 As shown, the light cone 301 may also adopt a vertical light cone, that is, the main light direction of the outgoing light of each light cone is the same, for example, they are 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 light direction is, for example, perpendicular to the light emitting surface of the light source 101. Here, the light cone 301 can gather at least part of the outgoing light of the corresponding light emitting device, so that most or all of the light emitted from the light cone 301 is the gathered light along the main light direction of the outgoing light of the light cone 301, so as to collect at least part of the outgoing light of the light emitting device toward the main light direction of the light cone 301, and gather the divergent outgoing light of the light emitting device within a smaller angle range.

[0099] In some examples, the light cone 301 is configured to form the light emitted therethrough into an illumination area 310 having a preset shape, wherein the preset shape includes a rectangle or a hexagon. For example, the preset shape is a square or a regular hexagon. Fig.10 A schematic diagram of an illumination area formed by a dimming component according to an embodiment of the present disclosure; Fig.11 A schematic diagram of another illumination area formed by the dimming component according to an embodiment of the present disclosure; Fig.10 The illumination area 310 is a square, Fig.11 The illumination area 310 is a regular hexagon, similar to a square; Fig.10 and 11 Furthermore, the shapes of the illumination areas 310 formed by the light emitted by each light cone 301 are the same. In this case, the illumination areas 310 formed by the light emitted by each light cone 301 can achieve non-interval contact, thereby improving the uniformity of the backlight. Of course, the edges of the illumination areas 310 formed by the light emitted by each light cone 301 may also overlap.

[0100] Furthermore, the shape of the light-emitting surface of the light cone 301 defines the shape of the illumination area 310 formed by the light emitted therefrom, and thus the light-emitting surface of the light cone 301 in the embodiment of the present disclosure may be any one of a square, a rectangle or a regular hexagon.

[0101] In some examples, Fig.12 is a schematic diagram of an exemplary dimming component according to an embodiment of the present disclosure; Fig.13 for Fig.12 A partial enlarged view of the light-emitting surface of the lens with an arc-shaped convex surface of the dimming component; Fig.12 and 13 As shown, the dimming component 30 not only includes the above structure, but also includes a plurality of lenses 303 with curved convex surfaces arranged one by one corresponding to the light cones 301, and a dispersing element 302 formed on the light-emitting surface side of the lenses 303 with curved convex surfaces. Specifically, the light cones 301 of the embodiment of the present disclosure are arranged in an array, a lens 303 with a curved convex surface is arranged on the light-emitting surface side of each light cone 301, and the dispersing element is arranged on the light-emitting surface side of the lens 303 with a curved convex surface. The lens 303 with a curved convex surface is configured to gather the light emitted by the corresponding light cone 301. The reason why the lens 303 with an arc-shaped convex surface is provided is that the emitted light of the light-emitting device 1011 is divergent. After the emitted light is adjusted by the light cone 301, not only the main light is adjusted, but also the light is collected as a whole. The light emitted through the light cone 301 is still divergent. At this time, the light is gathered by the lens 303 with an arc-shaped convex surface provided on the light-emitting surface side of the light cone 301, so as to further collect the emitted light of the light cone 301 in the direction of the main light required by the corresponding display panel partition, and adjust the overall light to a preset angle range. The diffusion element 302 is configured to diffuse the emitted light of the lens 303 with an arc-shaped convex surface so that the light can be projected to the entire eye box area. 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 eye box area.

[0102] It should be noted that the light incident surfaces of the light cones 301 are of the same size and shape. In the embodiment disclosed herein, the light cones 301 are arranged in an array, which means that the light exit surfaces of the light cones 301 are arranged in an array, based on the light exit surfaces of the light cones 301. In other words, the light cones 301 are arranged in an array. Figure 7The dimming component 30 in the embodiment mainly adjusts the main light of the light emitted by the light emitting device 1011 through the light cone 301, and the lens 303 with an arc-shaped convex surface gathers the light emitted by the light cone 301. In some examples, there is a gap between the light emitting surfaces of each light cone 301. This is set to facilitate the preparation, but it should be understood that the gap between the light emitting surfaces of each light cone 301 is very small to avoid the problem of uneven light.

[0103] In some examples, the dimming component 30 in the embodiment of the present disclosure can also adjust the outgoing light of the light emitting device 1011 by reducing the size of a single light cone 301 and increasing the number of light cones 301. In this case, the light can be adjusted without providing a lens 303 with an arc-shaped convex surface so that the light meets the display panel partition requirements. In this case, since the number of light cones 301 is large enough and the light-emitting surface of a single light cone 301 is relatively small, the light can be adjusted more accurately. It should be understood that since the display panel partitions and the number of light emitting devices are positively correlated with the number of light cones 301, the number of light cones 301 needs to be limited according to specific circumstances in actual applications.

[0104] In order to make the structure of the dimming component 30 of the embodiment of the present disclosure clearer, the following is explained in conjunction with specific examples. It should be noted that in the following examples, only the light cone 301 is taken as a quadrangular pyramid, that is, it has four sides. For at least part of the multiple light cones 301, the dihedral angle formed by at least one group of relative side surfaces among the multiple side surfaces of each light cone 301 and its light incident surface is not equal, that is, the dihedral angle formed by at least one group of relative side surfaces among the multiple side surfaces of each light cone 301 and its light incident surface may be unequal, or the dihedral angle formed by at least one group of relative side surfaces among the multiple side surfaces of a part of the light cone 301 and its light incident surface may be unequal, and the dihedral angle formed by the relative side surfaces among the multiple side surfaces of the remaining part of the light cone 301 and its light incident surface is equal.

[0105] The first example: Reference Fig.12 The dimming component 30 includes light cones 301 arranged in an array, lenses 303 with curved convex surfaces corresponding to the light cones 301 are arranged on the light exiting surface side of the light cones 301, and a diffusion element 302 is formed on the light exiting surface side of the lenses 303 with curved convex surfaces. In this example, the lenses 303 with curved convex surfaces are non-decentered lenses. The light cones 301, the lenses 303 with curved convex surfaces, and the diffusion element 302 are an integrated structure. Fig.14 Schematic diagram of the structure of the inclined light cone in the embodiment of the present disclosure in combination with a non-decentered lens; Fig.14As shown, the light cone 301 adopts an inclined light cone 301, and the lens 303 with an arc-shaped convex surface adopts a non-eccentric lens. In this example, the main light directions of the light cones 301 corresponding to different partitions of the display panel 20 are different. The main light angle of the light is adjusted by the light cone 301 ( Fig.14 The example of the bold light is a light emitted in the direction of the main light), and the light emitted through the light cone 301 is gathered by a non-decentered lens so that the light is emitted roughly in the direction of the main light to provide backlight for the display panel 20. In addition, in this example, the light cone 301, the lens 303 with an arc-shaped convex surface, and the diffusion element 302 are an integrated structure, which can further reduce dispersion and improve light efficiency.

[0106] Furthermore, since the light cones 301 are arranged in an array, the lenses 303 with curved convex surfaces arranged corresponding thereto are also arranged in an array. The first microstructure in the diffusion element 302 is a cylindrical lens formed on the light-emitting surface side of the lens 303 with curved convex surfaces and 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, the angle is 3°; the row direction is the row direction of the light cones 301 arranged in an array, and the column direction is the column direction of the light cones 301 arranged in an array. It should be noted that row and column are relative concepts. In the embodiment of the present disclosure, the direction in which the number of lenses 303 with curved 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 curved convex surfaces arranged side by side is relatively small is called the column direction.

[0107] Furthermore, for the convenience of description, the row direction is referred to as the first direction, the column direction is referred to as the second direction, and the extending direction of the cylindrical lens is referred to as the third direction. Fig.15 Three schematic diagrams of multiple first microstructures adjusting light provided in the embodiments of the present disclosure; Fig.15 As shown, the diffusion element 302 formed on the light-emitting surface side of each lens 303 having an arc-shaped convex surface may be composed of a plurality of light-condensing structures 3021 arranged side by side along the first direction, such as Fig.15 As shown in (a), it can also be composed of a plurality of divergent structures 3022 arranged side by side along the first direction, such as Fig.15 As shown in (b), it can also be composed of a focusing structure 3021 and a diverging structure 3022 alternately arranged in the first direction, such as Fig.15As shown in (c), the light-concentrating structure 3021 includes a light-concentrating surface 3021a for concentrating the light received therefrom, and the light-diverging structure 3022 includes a light-diverging surface 3022a for diverging the light received therefrom. When the dispersive element 302 is composed of light-concentrating structures 3021 arranged side by side along the first direction, the light-concentrating surface 3021a of each light-concentrating structure 3021 constitutes at least a part of the light-exiting surface of the lens 303 having an arc-shaped convex surface; when the dispersive element 302 is composed of light-concentrating structures 3022 arranged side by side along the first direction, the divergent surface 3022a of each light-concentrating structure 3021 constitutes at least a part of the light-exiting surface of the lens 303 having an arc-shaped convex surface; when the dispersive element 302 is composed of light-concentrating structures 3021 and divergent structures 3022 arranged alternately along the first direction, the light-concentrating surface 3021a of each light-concentrating structure 3021 and the divergent surface 3022a of each divergent structure 3022 constitute at least a part of the light-exiting surface of the lens 303 having an arc-shaped convex surface.

[0108] For details, please refer to Fig.15 After the light is incident on the focusing surface 3021a of the focusing structure 3021, it is focused, and on the side of the focal plane S2 of the focusing structure 3021 away from the focusing structure 3021, the light will gradually diverge; after the light is incident on the diverging surface 3022a of the diverging structure 3022, it is diverged, and on the first plane S1 on the side of the focal plane S2 away from the light cone 301 (the distance between the first plane S1 and the focal plane S2 is greater than or equal to the preset distance d0), the light can achieve a better diffusion effect.

[0109] In this embodiment, the first microstructure is provided to diffuse the imaging light, so that the light spot formed by the light emitted from each pixel of the display panel 20 is diffused to the eye box area as much as possible, so that the observer's eyes can see the complete image formed by the display panel 20 at any position in the eye box area. In addition, the first microstructure is integrated with the lens 303 having an arc-shaped convex surface into an integrated structure, so that the overall structure of the dimming component 30 can be simplified.

[0110] In this example, the first microstructure is a cylindrical lens formed on the light-emitting surface side of the lens 303 having an arc-shaped convex surface, and the extension direction of the cylindrical lens is the third direction, and the third direction has an angle with the second direction, and the angle is about 3°. In this case, the first microstructure mainly diffuses the light in the first direction. For example: the diffusion angle of the light of the first microstructure is ±15°, that is, the diffusion angle of the first microstructure in the first direction is ±15°.

[0111] It should be noted that from Fig.15It can be seen that 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, and the maximum offset angle of the main axis of the emitted light and the incident light in the first direction is the diffusion angle of the light by the first microstructure in the first direction.

[0112] When the first microstructure adopts a cylindrical lens, each first microstructure may be a light-condensing structure 3021; ​​or each first microstructure may be a diverging structure 3022; or a part of the first microstructures among the plurality of first microstructures may be light-condensing structures 3021, and another part of the first microstructures may be diverging structures 3022. When the plurality of first microstructures include a plurality of light-condensing structures 3021 and a plurality of diverging structures 3022, the light-condensing structures 3021 and the diverging structures 3022 are alternately arranged 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 focusing structure 3021 and the diverging structure 3022 can be arranged closely, so that the light-emitting surface of the lens 303 with an arc-shaped convex surface forms a smooth wavy surface, so that each position of the light-emitting surface of the lens 303 with an arc-shaped convex surface can diffuse the light, and the transition position between the two cylindrical lenses is smoother, thereby ensuring that the transition position can also reliably adjust and diffuse the light, thereby improving the imaging uniformity of the head-up display device.

[0113] Second example: Fig.16 A schematic diagram of an independent arrangement of a light cone and a lens having an arc-shaped convex surface according to an embodiment of the present disclosure; Fig.17 It is a schematic diagram of light cones arranged in an array according to an embodiment of the present disclosure; Fig.18 is a schematic diagram of a lens array with an arc-shaped convex surface according to an embodiment of the present disclosure; Fig.19 is a schematic diagram of a side of a second substrate away from a lens having an arc-shaped convex surface according to an embodiment of the present disclosure; Fig. 20 FIG. 1 is a partial enlarged view of a dispersing element according to an embodiment of the present disclosure formed on a side of the second substrate away from the lens 303 having an arc-shaped convex surface; Figure 16-20As shown, this example is different from the above two examples in that, in this example, the light cone 301 and the lens 303 with an arc-shaped convex surface are independently arranged. For example, each lens 303 with an arc-shaped convex surface is arranged on the second substrate 305, the light cone 301 is formed on the first substrate 304, and the convex surface of the lens 303 with an arc-shaped convex surface is opposite to the first substrate 304, and a certain gap is allowed between the two, and the lens 303 with an arc-shaped convex surface is arranged one by one with the light cone 301. At this time, a diffusion element 302 is formed on the surface of the second substrate 305 away from the lens 303 with an arc-shaped convex surface. In this example, the main light direction of the light emitted by the light cone 301 corresponding to different partitions of the display panel 20 is different, the main light angle of the light is adjusted by the light cone 301, and the light emitted through the light cone 301 is gathered by a non-decentered lens, so that the light is emitted along the main light direction, so as to provide backlight for the display panel 20.

[0114] The distance between the lens 303 with the arc-shaped convex surface and the first substrate 304 is very close, for example, the distance between the two is 0.1-0.5 mm, so as to avoid light loss and improve light efficiency.

[0115] In the embodiment of the present disclosure, the length direction of the second substrate 305 is the row direction of the arrangement of the lenses 303 with curved convex surfaces, that is, the first direction, and the width direction is the column direction of the arrangement of the lenses 303 with curved convex surfaces, that is, the second direction. Fig.16 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 formed on a surface of the second substrate 305 on a side away from the light cone 301, each first microstructure extending along a third direction, the third direction and the second direction have an angle of about 3°. The first microstructure may have the same structure as the first example, so it will not be repeated here.

[0116] The third example: Fig.21 Schematic diagram of the side of the first substrate away from the light cone according to an embodiment of the present disclosure; Fig.21As shown, this example is different from both the first and second examples. In the dimming component 30 of this example, there is no arrangement of the lens 303 with an arc-shaped convex surface, that is, it is composed of light cones 301 arranged in an array and arranged obliquely. Each light cone 301 can be arranged on the first substrate 304, and the diffusion element 302 is formed on the surface of the first substrate 304 away from the light cone 301. The number of light cones 301 in this example needs to be sufficient, so that the light incident surface of the light cone 301 is slightly smaller than the light exit surface of the light cone. At this time, the light beam emitted from the light exit surface of the light cone can basically be regarded as a light beam along the direction of the main light beam, and the divergence angle along the direction of the main light beam is small, and there is no need to use a lens 303 with an arc-shaped convex surface for focusing. By adjusting the main light angle of the outgoing light of the light emitting device 1011 through the light cone 301, and then diffusing it through the diffusion 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 light cones 301 and they are arranged relatively densely, based on the manufacturing process, there is still a certain gap between the light emitting surfaces of the light cones 301, and the gap is about 0.2-0.4 mm.

[0117] The length direction of the first substrate 304 is the row direction of the arrangement of the lenses 303 with arc-shaped convex surfaces, that is, the first direction, and the width direction is the column direction of the arrangement of the lenses 303 with arc-shaped convex surfaces, that is, the second direction. In some examples, the diffusion element 302 in the fourth example may include a plurality of first microstructures arranged side by side along the first direction formed on the surface of the second substrate 305 on the side away from the light cone 301, each of the first microstructures extending along the third direction, and the third direction and the second direction have an angle of about 3°. The first microstructure can use the same structure as the first example, so it will not be repeated here.

[0118] Fourth example: Fig. 22 A partial schematic diagram of another exemplary dimming component according to an embodiment of the present disclosure; Fig.23 Fig. 22 The dimming component shown is applied to a local schematic diagram of a backlight source; Fig.24 is a schematic diagram of the light cone with an eccentric lens; Figure 22-24As shown, the structure of the dimming component 30 in this example, the light cone, the lens 303 with an arc-shaped convex surface and the diffusion element 302 are an integrally formed structure, and the lens 303 with an arc-shaped convex surface is an eccentric lens. The main light direction of the light is adjusted by the cooperation of the light cone 301 and the lens 303 with an arc-shaped convex surface to meet the display panel partitioning requirements corresponding to the light cone 301. Specifically, the light cone 301 pre-adjusts the main light direction of the outgoing light of the light emitting device 1011 received by it according to the main light angle required for the display panel partition. After the outgoing light of the light cone 301 passes through the lens 303 with an arc-shaped convex surface, the lens 303 with an arc-shaped convex surface further adjusts the main light direction of the light received by it, and gathers the outgoing light of the light cone 301 so that the light can be projected to the center area of ​​the eye box of the head-up display device.

[0119] like Fig.24 As shown, for the lens 303 with an arc-shaped convex surface, an eccentric lens is used, and the angle of the outgoing light can be adjusted by designing the eccentric lens. Specifically, Fig.25 This is the direction control principle diagram of the eccentric lens, refer to Fig.25 , 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. The eccentric angle θ is determined by the focal length f and the eccentric distance d. Angle θ = artan (d / f). By designing the focal length f and the eccentric distance d, the angle of the outgoing light of the eccentric lens can be controlled.

[0120] The remaining structures in this example may adopt the structures in the first example, so they will not be repeated here.

[0121] The fifth example: Fig.26 A partial schematic diagram of another exemplary dimming component according to an embodiment of the present disclosure; Fig.26 As shown, the dimming component 30 is composed of a plurality of light cones 301 and a free-form surface lens 306 located on the light-emitting surface side of the light cone. The light cone 301 is configured to adjust the outgoing light of the light emitting device 1011 according to the principal ray angle required for the display panel partition; the free-form surface lens 306 is configured to gather the outgoing light of each light cone 301 so that the light can be projected to the center area 300a of the eye box of the head-up display device. Specifically, when the outgoing light of the light emitting device 1011 is irradiated to the corresponding light cone 301, the light cone 301 adjusts the outgoing light of the light emitting device 1011 according to the principal ray angle required for the corresponding display panel partition, so that the principal ray angle of the outgoing light of the light emitting device 1011 meets the principal ray angle required for the display panel partition, and the overall light converges in the direction of the principal ray angle, and the outgoing light of each light cone 301 is gathered by the free-form surface lens 306 so that the light can be projected to the center area 300a of the eye box of the head-up display device.

[0122] In some examples, reference Fig.26 The light cone 301 and the free-form surface lens 306 are an integrated structure. A diffusion element 302 is formed on the light-emitting surface side of the free-form surface lens 306. The diffusion element 302 is configured to diffuse the emitted light of the free-form surface lens 306 so that the light can be projected to the entire 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 eye box area.

[0123] Furthermore, the light cone 301, the free-form surface lens 306 and the dispersing element 302 may all be an integrated structure, which can further reduce dispersion and improve light efficiency.

[0124] The light cones 301 of the disclosed embodiment are 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 free-form surface lens 306 and arranged side by side along the row direction, and the extension direction of the cylindrical lens and the column direction have an angle, for example, the angle is 3°; the row direction is the row direction of the light cones 301 arranged in an array, and the column direction is the column direction of the light cones 301 arranged in an array.

[0125] It should be noted that Fig.26 FIG. 3 only illustrates a dimming component 30 in which the light cone 301 and the free-form surface lens 306 are an integrated structure. In some examples, the light cone 301 and the free-form surface lens 306 in the dimming component 30 may also be separate structures with a gap therebetween. Fig. 27 Schematic diagram of independent arrangement of the light cone and the free-form surface lens according to an embodiment of the present disclosure, as shown in FIG. Fig. 27 As shown, the light cone 301 and the free-form surface lens 306 in the dimming component 30 can also be a split structure, and the free-form surface of the free-form surface lens 306 is used as the light-emitting surface. Of course, the plane of the free-form surface lens 306 can also be used as the light-emitting surface.

[0126] The above are several exemplary structures of the dimming components 30 , and the above structures do not constitute a limitation on the protection scope of the embodiments of the present disclosure.

[0127] In some examples, the light cone 301 can be made of silicone material, COC or COP material, and the lens 303 with an arc-shaped convex surface can be made of silicone material or plastic PC material. When the light cone 301 and the lens 303 with an arc-shaped convex surface are an integrated structure, both can be made of silicone material, which is convenient for preparation.

[0128] In some examples, the outer contour of the light incident surface of the light cone 301 can be rectangular or circular. For example, when the light incident surface of the light cone 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 lofting. When the light incident surface is circular, the area of ​​the light entrance can be relatively large, which is easy to implement in the process.

[0129] In some examples, the light incident surface of the light cone 301 may be a plane or a free-form surface. The light efficiency may be improved and the light loss may be reduced through reasonable design of the light incident surface of the light cone 301 .

[0130] Fig.28 FIG. 2 is another schematic diagram of applying the dimming component of the embodiment of the present disclosure to a backlight source; FIG. Fig.28 As shown, a dimming component is also provided in the embodiment of the present disclosure, which is substantially the same as the above-mentioned dimming component in structure, except that the dimming component does not have a positioning plate, and only embeds a support component 90 in the first substrate 304, so that the light-emitting surfaces of each light cone 301 are in the same horizontal plane. By embedding the support component 90 in the first substrate 304, it is possible to avoid the light-emitting surface side of the light cone array from collapsing easily, thereby avoiding the problem of the light-incident surface of the light cone 301 being offset from the light-emitting device 1011.

[0131] The structure of the support assembly 90 may be the same as that in the above example, so it will not be described in detail here.

[0132] like Figure 5 As shown, the embodiment of the present disclosure provides a backlight source, which includes any one of the dimming components 30 mentioned above. Of course, the backlight source also includes a light source, and the light source includes a plurality of light-emitting devices 1011. The dimming component 30 is arranged on the light-emitting surface side of the light-emitting device 1011, and is used to adjust the emission direction of the light emitted by the light-emitting device 1011 so that the light can irradiate the center area of ​​the eye box of the head-up display device. Among them, the plurality of light-emitting devices 1011 of the light source are in the same horizontal plane, the plurality of light cones 301 are in the same horizontal plane, and the plane where the light-emitting device 1011 is located is relatively parallel to the plane where the light cone 301 is located, and the two are opposite.

[0133] In some examples, the light-emitting device 1011 can 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 LED cold light source (Cold LED Light, CLL), electroluminescence (EL), electron emission (Field Emission Display, FED), a tungsten halogen lamp or a metal halide lamp, etc., but the present public embodiment does not limit this.

[0134] In some examples, one light-emitting device 1011 may be provided corresponding to one light cone 301, or a plurality of light-emitting devices 1011 arranged in an array may correspond to one light cone 301. In the embodiment of the present disclosure, due to the limitation of the preparation process of the light cone 301, it is preferred to design the main light direction of the outgoing light of the light cone 301 according to the requirements of the display panel partition for the main light direction, and then design the arrangement of the light-emitting devices 1011 after designing the light cone 301. Therefore, the light-emitting devices 1011 may be arranged regularly or irregularly. Of course, in some examples, the light-emitting devices 1011 may be arranged regularly, such as in an array, and then the light cone 301 is designed according to the arrangement of the light-emitting devices 1011 and the requirements of the display panel partition for the main light direction.

[0135] In some examples, the light emitting devices 1011 in the light source are located in the same horizontal plane, facing the light incident surface of the light cone 301 . This helps to make the light uniform and can also reduce the thickness of the backlight source 10 .

[0136] In some examples, the distance between the light emitting device 1011 and the corresponding light cone 301 is 0.1-0.4 mm, that is, the distance between the light emitting device 1011 and the light cone 301 is very small, so the light utilization rate can be improved and the light loss can be reduced.

[0137] In some examples, each light emitting device 1011 in the light source is mounted on a printed circuit board 1012, and the surface of the printed circuit board 1012 on which the light emitting device 1011 is mounted is coated with white ink. The white ink can protect the printed circuit board 1012, prevent the printed circuit board 1012 from chemical corrosion, and increase the service life.

[0138] In some examples, Fig.29 is a schematic diagram of a backlight source according to an embodiment of the present disclosure; Fig.29 As shown, the backlight source also includes a homogenizing and dispersing element 40, which is disposed between the dimming component 30 and the display panel 10 and is used to homogenize the received light. The homogenizing and dispersing element 40 may include a plurality of homogenizing structures, which are used to scatter and / or diffract the light, thereby achieving the diffusion of the light. The size of the homogenizing structure is less than 1 micron, so that the imaging brightness of the display panel is more uniform.

[0139] The homogenizing and dispersing element 40 can be a scattering optical element, such as a light homogenizing sheet, a diffuser, etc.; 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 better control over the diffusion effect, wherein light will be scattered when passing through a scattering optical element such as a light homogenizing sheet, and the light will be transmitted to many different angles, and a small amount of diffraction will occur, but the scattering of light plays a major role. The diffractive optical element mainly expands the light beam through diffraction by designing a specific microstructure on the surface, so that the size and shape of the light spot can be controlled.

[0140] Fig.30 is a schematic diagram of an image source of the disclosed embodiment; Fig.30 As shown, an embodiment of the present disclosure provides an image source, which includes a backlight source 10 and a display panel 20 located on the light emitting surface side of the backlight source 10. The backlight source 10 may be the backlight source 10 described above.

[0141] The display panel 20 is disposed on the light-emitting side of the backlight source 10, and is used to convert the light of the backlight source 10 into image light and output it to the eye box area. The display panel 20 includes a plurality of pixel units, each of which may include a plurality of pixels, for example, each of which includes a red pixel, a green pixel, and a blue pixel.

[0142] The display panel 20 may include an array substrate, a color filter substrate and a liquid crystal layer located therebetween, which are arranged relatively to each other. The color filter substrate may include a plurality of color filter portions, each color filter portion corresponding to a pixel. For example, the plurality of color filter portions include a red filter portion corresponding to a red pixel, a green filter portion corresponding to a green pixel, and a blue filter portion corresponding to a blue pixel. In some embodiments, the spectrum of the backlight matches the transmission spectrum of the color filter substrate, so that more light in the backlight can be transmitted through the display panel and converted into image light, thereby improving the transmittance of the backlight, reducing the proportion of the display panel converting the backlight into heat energy, reducing the temperature rise of the display panel, and thereby extending the service life of the display panel.

[0143] It should be noted that the matching of the spectrum of the backlight and the transmission spectrum of the color filter substrate means that the peaks in the luminous spectrum of the backlight correspond to the peaks in the transmittance spectrum of the color filter substrate one by one, and the corresponding two peaks are located in the same or substantially the same wavelength band. For example, the red filter portion is used to transmit light with a wavelength in the range of 625 to 740 nm, the green filter portion is used to transmit light with a wavelength in the range of 492 nm to 577 nm, and the blue filter portion is used to transmit light with a wavelength in the range of 440 to 475 nm, that is, the transmittance spectrum of the color filter substrate has three first peaks, and the three first peaks are respectively in the wavelength bands of 625 to 740 nm, 492 nm to 577 nm, and 440 to 475 nm. In this case, the luminous spectrum of the backlight also includes three second peaks, and the wavelength bands of the three second peaks are the same as the above three wavelength bands, or at least 70% overlap.

[0144] Fig.31 Schematic diagram of another image source of the disclosed embodiment; Fig.31 As shown, in some examples, the image source 100 further includes a polarization control element 24. The display panel 20 includes a first polarizer 21, a liquid crystal layer 23 and a second polarizer 22.

[0145] The first polarizer 21 and the second polarizer 22 are respectively arranged on both sides of the liquid crystal layer 23, and the first polarizer 21 is located between the liquid crystal layer 23 and the backlight source 10. The first polarizer 21 is used to transmit the first linear polarized light, and the second polarizer 22 is used to transmit the second linear polarized light, and the polarization direction of the second linear polarized light is perpendicular to the polarization direction of the first linear polarized light. The polarization control element 24 is arranged between the backlight source 10 and the first polarizer 21, and the polarization control element 24 is used to transmit the first linear polarized light and reflect or absorb the second linear polarized light.

[0146] The display panel 20 may further include a first substrate and a second substrate (not shown in the figure), and the liquid crystal layer 23 is located between the first substrate and the second substrate, wherein the first polarizer 21 may be located on a side of the first substrate away from the liquid crystal layer 23, and the second polarizer 22 may be located on a side of the second substrate away from the liquid crystal layer 23.

[0147] Among them, polarizers with perpendicular polarization states, namely, a first polarizer 21 and a second polarizer 22, are respectively arranged on opposite sides of the liquid crystal layer 23 of the display panel 20; the first linear polarized light can pass through the first polarizer 21, the second linear polarized light can pass through the second polarizer 22, and the polarization direction of the first linear polarized light is perpendicular to the polarization direction of the second linear polarized light. Since the light emitted by the backlight source 10 is generally non-polarized light, that is, about 50% of the light energy is absorbed by the first polarizer 21, this part of the light energy will cause the display panel 20 to heat up, thereby affecting the service life of the display panel 20. In the embodiment of the present disclosure, a polarization control element 24 is arranged between the backlight source 10 and the first polarizer 21, and the polarization control element 24 can pass through the first linear polarized light and reflect or absorb the second linear polarized light, so that the light reaching the first polarizer 21 is only the first linear polarized light, thereby avoiding the first polarizer 21 from absorbing the second linear polarized light, avoiding the display panel 20 from absorbing heat, and thus extending the service life of the display panel 20. Among them, if the second linear polarized light can be absorbed by the polarization control element 24, it is only necessary to ensure that the polarization control element 24 is separated from the display panel 20 by a certain distance; in addition, if the polarization control element 24 can reflect the second linear polarized light, the reflected second linear polarized light can be reflected again to the polarization control element 24 through the reflection effect of other components, and part of the light can be converted into the first linear polarized light, so that more light can be used for imaging the display panel 20, thereby improving the utilization rate of light.

[0148] Optionally, the polarization control element 24 is a reflective polarization reflective film, specifically DBEF (Dual Brightness Enhancement Film), BEF, a photonic crystal with polarization and incident angle selective transmittance, etc., and when the polarization control element 24 is capable of reflecting the second linearly polarized light, the polarization control element 24 can be attached to the surface of the display panel 20 facing the backlight source 10.

[0149] In some examples, the polarization control element 24 and the homogenizing and dispersing element 40 are two different elements; in other examples, the homogenizing and dispersing element 40 itself has the function of reflecting or absorbing the second linearly polarized light. In this case, the homogenizing and dispersing element 40 can be used as the polarization control element 24, and there is no need to set up an additional polarization control element 24.

[0150] Fig.32 Schematic diagram of the structure of the head-up display device of the embodiment of the present disclosure; Fig.32 As shown, the embodiment of the present disclosure provides a head-up display device, which includes the image source 100 in the above example and a reflective imaging element 500. The reflective imaging element 500 is used to receive the image light output by the image source 100 and output the image light to the preset area 300.

[0151] In some embodiments, Fig.32 As shown, the head-up display device may further include a housing 600, wherein the image source 100 and the reflective imaging element 500 are both located in the housing 600, thereby protecting the image source 100 and the reflective imaging element 500. The housing 600 has an opening 601, so that image light can be emitted from the opening 601.

[0152] In some embodiments, the reflective imaging element 500 may include a magnifying element 501, and the magnifying element 501 may enable the head-up display device to have a longer imaging distance and a larger imaging size. For example, the imaging distance and the imaging size may be changed by changing the magnification of the magnifying element 501. The magnification may be changed by adjusting parameters such as the curvature of the magnifying element 501.

[0153] In some embodiments, the magnifying element 501 may be a curved reflector, and optionally, the curved reflector is a concave reflector, that is, a reflector whose reflective surface is a concave curved surface. In the case where the curved reflector is a concave reflector, if the optical distance between the image source 100 and the concave reflector is less than the focal length of the concave reflector, the concave reflector forms an erected and magnified virtual image based on the image output by the image source 100. For example, according to the imaging properties of the concave reflector, when the optical distance between the image source 100 and the concave reflector is less than the focal length of the concave reflector (that is, the image source 100 is within one focal length of the concave reflector), the image distance of the concave reflector increases with the increase of the optical distance between the image source 100 and the concave reflector, that is, the greater the optical distance between the image source 100 and the concave reflector, the greater the distance between the observer and the virtual image 400 observed by the observer.

[0154] Optionally, the curved reflector is a free-form reflector, that is, the reflective surface is a free-form reflector, or the reflective surface does not have rotational symmetry, so as to improve the imaging quality of the head-up display device.

[0155] In some other optional embodiments, the amplifying element 501 may be an optical waveguide or a holographic optical element.

[0156] like Fig.32 As shown, the reflective imaging element 500 is not limited to only including the magnifying element 501, but may also include a plane reflector 502, through which the optical path of the image light propagation is adjusted, thereby reducing the volume of the head-up display device.

[0157] The embodiment of the present disclosure further provides a vehicle, which includes the head-up display device and the windshield 200 in the above embodiment. Fig.33 Schematic diagrams of head-up display devices and windshields according to some examples of the present disclosure; Fig.33As shown, the windshield 200 is used to reflect the image light emitted by the head-up display device to the preset area 300. The windshield 200 has a semi-transparent and semi-reflective characteristic, so that the image light emitted by the head-up display device can be reflected by the windshield 200 to the preset area 300. At the same time, the light outside the vehicle can also pass through the windshield 200 to reach the preset area 300, so that when the observer's eyes are located in the preset area 300, he can see the image formed by the head-up display device and the scene outside the vehicle at the same time. Among them, "semi-transparent and semi-reflective" in the embodiment of the present disclosure means that the windshield 200 can transmit light and reflect light, and is not limited to transmitting 50% of the light and reflecting 50% of the light. For example, the transmittance of visible light is greater than or equal to 70%.

[0158] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill 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 dimming component, applied to a backlight source of a head-up display device, characterized in that: include: A plurality of light cones are located on the light emitting surface side of the plurality of light emitting devices and are arranged one by one with the light emitting devices; the cross-sectional area of ​​the light cones increases monotonically along the direction from the light incident surface to the light emitting surface; the light cones are configured to correspond to different partitions of the display panel of the head-up display device and adjust the emitted light of the light emitting device received by the light cones; The positioning plate has a plurality of positioning holes, the light cones are arranged in one-to-one correspondence with the positioning holes, and the outer contour of the light incident surface of the light cone is fixed on the inner wall of the corresponding positioning hole.

2. The dimming component according to claim 1, characterized in that: The light cone has only an outer contour of its light incident surface at least partially in contact with the inner wall of the corresponding positioning hole.

3. The dimming component according to claim 1, characterized in that: The inner wall of the positioning hole is covered with a reflective film, which is configured to reflect the emitted light of the light-emitting device received by the inner wall to the light cone corresponding to the positioning hole.

4. The dimming component according to claim 1, characterized in that: From the direction of the light exiting surface of the light cone to the light incident surface thereof, the aperture of the positioning hole decreases monotonically.

5. The dimming component according to claim 1, characterized in that: The positioning plate also includes mounting holes corresponding to the positioning holes one by one, and the mounting holes are connected to the corresponding positioning holes. The mounting holes are used to accommodate the light-emitting devices, and when the light-emitting devices are installed in the mounting holes, there is a certain distance between the light-emitting devices and the light incident surface of the corresponding light cone.

6. The dimming component according to claim 1, characterized in that: It also includes a first substrate, which is arranged on the light emitting surface of each light cone; The supporting assembly is arranged in the first substrate so that the light emitting surfaces of the light cones are located in the same horizontal plane.

7. The dimming component according to claim 6, characterized in that: The orthographic projection of the supporting assembly on the plane where the first substrate is located covers the orthographic projection of each of the light cones on the plane where the first substrate is located.

8. The dimming component according to claim 6, characterized in that: The first substrate, the light cone and the supporting assembly are an integrally formed structure and are injection molded parts.

9. The dimming component according to claim 6, characterized in that: The support component is made of glass.

10. The dimming component according to any one of claims 1 to 9, characterized in that: The main light rays of the light cones are in the same direction; or, The main light directions of the outgoing light rays in each of the light cones are different, so that the outgoing light rays can be projected to the center area of ​​the eye box of the head-up display device.

11. The dimming component according to any one of claims 1 to 9, characterized in that: The light incident surface of the light cone is any one of a curved surface, a plane, or a free-form surface that is convex away from the light emitting surface.

12. The dimming component according to any one of claims 1 to 9, characterized in that: It also includes a lens structure, which is arranged on the light-emitting surface side of the light cone and is configured to adjust the emitted light of the light cone.

13. The dimming component according to claim 12, characterized in that: The lens structure and the light cone are an integrally formed structure; or, The lens structure and the light cone are separate structures, and there is a gap between them.

14. The dimming component according to claim 12, characterized in that: The lens structure adopts any of the following: A lens array consisting of a plurality of eccentric lenses; A lens array consisting of a plurality of non-decentered lenses; Free-form lens.

15. A backlight source, characterized in that: include: A light source, comprising a plurality of light emitting devices, wherein each of the light emitting devices is located in the same horizontal plane; The dimming component is arranged on the light-emitting surface side of the corresponding light-emitting device and is configured to adjust the emission direction of the emitted light of the light-emitting device; the dimming component adopts the dimming component described in any one of claims 1-14.

16. The backlight source according to claim 15, characterized in that: The light source further comprises a printed circuit board, and the light emitting device is mounted on the printed circuit board; The positioning plate is attached to the surface of the printed circuit board on which the light emitting device is mounted.

17. An image source in a head-up display device, characterized in that: include: Backlight source; A display panel is arranged on the light-emitting side of the backlight source, and is used to convert the light of the backlight source into image light and then output it to a preset area; wherein, The backlight source adopts the backlight source described in claim 15 or 16.

Images