Direction control assembly, backlight source, image source, head-up display device and vehicle

Abstract

The utility model provides a direction control assembly, a backlight source, an image source, head-up display equipment and a vehicle, and the assembly comprises a lamp tube part which is internally provided with a plurality of lamp tubes; the plurality of lamp barrels are in one-to-one correspondence with a plurality of partitions of a display panel of the head-up display equipment; at least one part of the lamp barrel is a frustum-shaped cavity which is defined by a plurality of reflecting surfaces and is provided with a light inlet and a light outlet at two ends respectively, the area of the light inlet is smaller than that of the light outlet, and the light inlet is used for being arranged opposite to the light outlet surface of at least one light source; the lamp tube pre-adjusts the direction of at least part of emergent light rays of at least one corresponding light source according to the main light ray direction required by the corresponding partition; the lens component is arranged on the light emitting side of the lamp barrel component, a lens structure is arranged on the surface, opposite to or away from the lamp barrel component, of the lens component, and the lens structure is used for adjusting the direction of at least part of emergent light rays of the lamp barrel component so that the emergent light rays of the display panel can be projected to the center position of the preset eye box area. The problems of too many components, low backlight light efficiency, chromatic dispersion and the like in the prior art can be solved.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and in particular to a direction control component, a backlight source, an image source, a head-up display device and a vehicle. 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.

[0003] In the backlight source of existing head-up display devices, multiple components are generally required to perform operations such as focusing, direction control, and uniform light on the outgoing light of the light source so that the light can be projected to the eye box area and have a high degree of uniformity in the entire eye box area. However, light is bound to be lost when passing through too many components, resulting in low backlight efficiency and dispersion problems. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art, and proposes a direction control component, a backlight source, an image source, a head-up display device and a vehicle, which can solve the problems of too many components, low backlight efficiency, dispersion, etc. in the prior art.

[0005] To achieve the above objectives, an embodiment of the present application provides a direction control component, which is applied to a backlight source of a head-up display device, including:

[0006] A lamp tube component, wherein a plurality of lamp tubes are arranged in the lamp tube component;

[0007] The plurality of lamp tubes correspond one-to-one to the plurality of partitions of the display panel of the head-up display device; at least a portion of the lamp tube is a prism-shaped cavity surrounded by a plurality of reflective surfaces, with a light inlet and a light outlet at both ends, respectively; the area of ​​the light inlet is smaller than the area of ​​the light outlet, and the light inlet is used to be arranged opposite to the light outlet surface of at least one light source;

[0008] The lamp tube is used to pre-adjust the direction of at least part of the emitted light of the corresponding at least one light source according to the main light direction required by the corresponding partition;

[0009] A lens component is arranged on the light-emitting side of the lamp tube component, and a lens structure is arranged on the surface of the lens component opposite to or away from the lamp tube component, and the lens structure is used to adjust the direction of at least part of the outgoing light of the lamp tube component so that the outgoing light of the display panel can be projected to the center position of a preset eye box area.

[0010] In some embodiments, the plurality of reflective surfaces are divided into at least two reflective surface groups, each of which includes two opposite reflective surfaces;

[0011] For at least some of the multiple lamp tubes, two of the reflective surfaces in at least one group of the reflective surface groups have different angles with the plane where the light entrance and / or the light exit are located, so as to adjust the main light direction of the outgoing light of the lamp tube.

[0012] In some embodiments, the shape of the light outlet includes a rectangle or a hexagon.

[0013] In some embodiments, a plurality of the lamp tubes are arranged in an array, and a side edge of each of the light outlets is adjacent to a side edge of an adjacent light outlet.

[0014] In some embodiments, the lens structure includes a plurality of lenses having curved convex surfaces, and the plurality of lenses correspond one-to-one to the light outlets of the plurality of lamp tubes; the lenses are used to adjust the main light direction of the corresponding outgoing light of the lamp tube so that the outgoing light of the corresponding partition of the display panel can be projected to the center position of the preset eye box area.

[0015] In some embodiments, the lens is a decentered lens.

[0016] In some embodiments, the lens is arranged on the surface of the lens component opposite to the lamp tube component, and the closest position of the arcuate convex surface to the light outlet corresponding to the distance is flush with the plane where the light outlet is located; or, at least a portion of the arcuate convex surface is located in the corresponding lamp tube.

[0017] In some embodiments, the lens structure includes a free-form surface lens, and the free-form surface lens is used to adjust the direction of at least part of the outgoing light of the lamp tube component so that the outgoing light of the display panel can be projected to the center position of the preset eye box area.

[0018] In some embodiments, the lens structure is arranged on the surface of the lens component opposite to the lamp tube component, and a diffusion structure is arranged on the surface of the lens component away from the lamp tube component, and the diffusion structure is used to diffuse the outgoing light of the lens component so as to diffuse the outgoing light of the display panel and form a light spot covering the entire preset eye box area.

[0019] In some embodiments, the lens structure is arranged on the surface of the lens component opposite to the lamp tube component, and a diffusion structure is formed on the light-emitting surface of the lens structure, and the diffusion structure is used to diffuse the outgoing light from the light-emitting surface of the lens structure, so that the outgoing light of the display panel is diffused and forms a light spot covering the entire preset eye box area.

[0020] In some embodiments, the diffusion structure includes a plurality of strip-shaped concave portions and a plurality of strip-shaped convex portions arranged in sequence along a first preset direction, and the strip-shaped concave portions and the strip-shaped convex portions are alternately arranged in the first preset direction; the length directions of the strip-shaped concave portions and the strip-shaped convex portions are parallel to a second preset direction, and the second preset direction intersects with the first preset direction; or,

[0021] The dispersion structure includes a plurality of strip-shaped concave portions or a plurality of strip-shaped convex portions arranged in sequence along a first preset direction, wherein the length direction of the strip-shaped concave portions or the strip-shaped convex portions is parallel to a second preset direction, and the second preset direction intersects with the first preset direction.

[0022] In some embodiments, the lamp tube component includes a first sub-lamp tube component and a second sub-lamp tube component which are arranged in sequence along a direction away from the light emitting surface of the light source, the first sub-lamp tube component is provided with a plurality of first segments of the lamp tube, the second sub-lamp tube component is provided with a plurality of second segments of the lamp tube, the first segments and the second segments correspond one to one and together constitute the complete lamp tube.

[0023] In some embodiments, the first segment is a first sub-prism-shaped cavity, the second segment is a second sub-prism-shaped cavity, and the first sub-prism-shaped cavity and the second sub-prism-shaped cavity together constitute the complete lamp tube.

[0024] In some embodiments, the first segment is a truncated cone-shaped transparent solid portion having a total reflection surface, and the second segment is the prism-shaped cavity. The prism-shaped cavity corresponds to the transparent solid portion one by one and together constitute the complete lamp tube.

[0025] In some embodiments, the outer contour of the light incident surface of the frustum-shaped transparent solid portion is circular or rectangular.

[0026] In some embodiments, the light incident surface of the frustum-shaped transparent solid portion is a plane or a free-form surface.

[0027] As another aspect of the present application, an embodiment of the present application further provides a backlight source, including:

[0028] Multiple light sources;

[0029] The above-mentioned direction control component provided in the embodiment of the present application is arranged on the light emitting side of the plurality of light sources.

[0030] In some embodiments, the position of the light source is configured to be set according to the main light direction of the corresponding lamp tube.

[0031] In some embodiments, the light entrance is spaced apart from or closely attached to a light emitting surface of at least one of the light sources.

[0032] In some embodiments, the lamp tube is entirely composed of a cavity, the portion of the cavity located above the light emitting surface of the corresponding at least one light source is the prism-shaped cavity, and the portion of the cavity located below the light emitting surface of the light source is used to accommodate the corresponding at least one light source.

[0033] As another aspect of the present application, an embodiment of the present application further provides an image source in a head-up display device, which includes:

[0034] The above-mentioned backlight source provided in the embodiment of the present application;

[0035] The display panel is arranged on the light-emitting side of the backlight source, and is used for converting the light of the backlight source into image light and outputting it to a preset eye box area.

[0036] As another aspect of the present application, an embodiment of the present application further provides a head-up display device, comprising:

[0037] The above-mentioned image source provided in the embodiment of the present application;

[0038] A reflective imaging element is used to receive the image light and output the image light to the preset eye box area.

[0039] As another aspect of the present application, an embodiment of the present application further provides a vehicle, comprising:

[0040] The above-mentioned head-up display device provided in the embodiment of the present application;

[0041] A windshield is used to reflect the image light emitted by the head-up display device to the preset eye box area.

[0042] Other objects and features of the present application will become clear by reading the specification, claims and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0044] Figure 1This is a schematic diagram of the application of the head-up display device provided in some examples.

[0045] Figure 2 Schematic diagram of application of head-up display devices provided in other examples.

[0046] Figure 3 A cross-sectional schematic diagram of a direction control assembly provided in the first embodiment of the present application.

[0047] Figure 4 This is a three-dimensional schematic diagram of the prism-shaped cavity used in the first embodiment of the present application.

[0048] Figure 5 This is a three-dimensional schematic diagram of a lamp tube component used in the first embodiment of the present application.

[0049] Figure 6 This is a schematic diagram of an illumination area formed by a lamp tube component used in the first embodiment of the present application.

[0050] Figure 7 A schematic diagram of another illumination area formed by another lamp tube component used in the first embodiment of the present application.

[0051] Figure 8 This is a cross-sectional schematic diagram of a segmented lamp tube component used in the first embodiment of the present application.

[0052] Fig. 9 This is a cross-sectional schematic diagram of another segmented lamp tube component used in the first embodiment of the present application.

[0053] Fig.10 This is a schematic diagram of the eccentric lens used in the first embodiment of the present application.

[0054] Fig.11 A cross-sectional schematic diagram of another direction control assembly provided in the first embodiment of the present application.

[0055] Fig.12 A cross-sectional schematic diagram of yet another direction control assembly provided in the first embodiment of the present application.

[0056] Fig.13 A cross-sectional schematic diagram of yet another direction control assembly provided in the first embodiment of the present application.

[0057] Fig.14 A cross-sectional schematic diagram of a direction control assembly provided in the second embodiment of the present application.

[0058] Fig.15 This is a three-dimensional schematic diagram of the lens component used in the second embodiment of the present application.

[0059] Fig.16It is a partial three-dimensional schematic diagram of the diffusion structure adopted in the second embodiment of the present application.

[0060] Fig.17 This is a schematic diagram of the light path of a diffusion structure used in the second embodiment of the present application.

[0061] Fig.18 This is a schematic diagram of the light path of another diffusion structure used in the second embodiment of the present application.

[0062] Fig.19 This is a schematic diagram of the light path of another diffusion structure used in the second embodiment of the present application.

[0063] Fig. 20 This is a schematic diagram of the local structure of the diffusion structure adopted in the second embodiment of the present application, which is arranged on the light-emitting surface of the lens.

[0064] Fig.21 A cross-sectional schematic diagram of an image source provided in an embodiment of the present application.

[0065] Fig. 22 A cross-sectional schematic diagram of another image source provided in an embodiment of the application.

[0066] Fig.23 A schematic diagram of the structure of a head-up display device provided in an embodiment of the present application.

[0067] Fig.24 Schematic diagrams of some example head-up display devices and windshields of the present application.

[0068] Description of main component symbols:

[0069] 100-image source; 10-backlight source; 101-light source; 20-display panel; 21-first polarizer; 22-second polarizer; 23-liquid crystal layer; 24-polarization control element; 30-direction control component; 301-lamp tube component; 301a, 301a'-first sub-lamp tube component; 301b-second sub-lamp tube component; 3011-lamp tube; 3011a, 3011a'-first segment; 3011b-second segment; 3012-reflection surface; 3013-light inlet; 3014-light outlet; 302-lens component; 3021-lens; 3022-arc convex surface; 303-diffusing structure; 3031-strip convex part; 3032-strip concave part; 3031a-arc convex surface; 3032a-arc concave surface; 304-free-form surface lens; 3041-free-form surface; 40-homogenizing diffusion element; 310-illuminance area; 200-windshield; 300-preset eye box area; 300a-eye box central area; 400-virtual image; 500-reflective imaging element; 501-magnifying element; 502-plane reflector; 600-housing; 601-opening; a1, a2-angles; S1-first plane; S2-focal plane. DETAILED DESCRIPTION

[0070] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0071] In the description of the present application, 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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0075] The embodiment of the present application provides a direction control component 30, which is applied to the backlight source of a head-up display device. The head-up display device can be installed on a vehicle or other transportation vehicle. Figure 1As shown, the head-up display device includes an image source 100 for outputting image light, and the image source 100 includes a backlight source 10 and a display panel 20 arranged on the light-emitting side of the backlight source. 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 into image light. The windshield 200 of the vehicle is used to reflect the image light to the preset eye box area 300, so that when the observer's eyes are in the preset eye box area 300, the image formed by the image light can be seen. At this time, the image seen by the observer is 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 preset eyebox area (i.e., eyebox) 300 specifically refers to the area where the observer's eyes are located and the image output by the head-up display device (i.e., the virtual image 400) can be seen. The preset eyebox area 300 has a certain shape and size, and even if the observer's eyes deviate from the center of the preset eyebox area 300 by a certain distance, such as a certain distance in the up-down or left-right direction, as long as they are still within the preset eyebox area 300, they can see the image output by the head-up display device.

[0077] like Figure 2 As shown, the backlight source 10 includes a plurality of light sources 101 ( Figure 2 , only a rectangular frame is schematically used to indicate the location of multiple light sources 101, and the specific structure of the multiple light sources 101 is not shown), a converging element 102 and a light angle control element 103. Among them, the light angle control element 103 may include a combination of one or more of a convex lens, a concave lens, and a Fresnel lens. The light emitted by the light source 101 is collimated by the converging element 102 and then irradiated to the light angle control element 103 to further adjust the light to provide backlight for the display panel. Among them, after the light is adjusted by the light angle control element 103, the outgoing light of the display panel can be directed to the preset eye box area 300.

[0078] However, in order to achieve operations such as focusing and direction control of the light emitted by the light source 101, the prior art generally uses a combination of multiple components such as a lens array and a Fresnel lens. There are many components, and the light passing through too many components is bound to be lost, resulting in low backlight efficiency. Moreover, the prior art generally uses a lens array to collimate or directionally control the light emitted by the light source 101. Since the refractive index of the lens material for light of different wavelengths is different, the light emitted by the lens has a problem of uneven color, that is, a dispersion problem.

[0079] First embodiment

[0080] To resolve at least one of the above technical issues, please also refer to Figure 3 and Figure 4 The direction control assembly 30 provided in the first embodiment of the present application includes a lamp tube component 301 and a lens component 302, wherein the lamp tube component 301 is provided with a plurality of lamp tubes 3011; the plurality of lamp tubes 3011 correspond one-to-one to the plurality of partitions of the display panel 20 of the head-up display device; at least a portion of the lamp tube 3011 is a prism-shaped cavity surrounded by a plurality of reflective surfaces 3012, with a light inlet 3013 and a light outlet 3014 at both ends, respectively; the area of ​​the light inlet 3013 is smaller than the area of ​​the light outlet 3014, and the light inlet 3013 is used to be arranged opposite to at least one light source 101. The lamp tube 3011 is used to pre-adjust the direction of at least part of the outgoing light of the corresponding at least one light source 101 according to the main light direction required by the corresponding partition.

[0081] The main light direction here refers to the main light direction of the outgoing light of the lamp tube 3011. By making multiple lamp tubes 3011 correspond to multiple partitions of the display panel 20 one by one, the lamp tube component 301 can realize the partition control of the outgoing light of the display panel 20, so as to improve the light control accuracy. The partition of the display panel 20 refers to the multiple areas divided by the display area of ​​the display panel 20, and each partition is distributed with 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. The main light direction required for the partition refers to the main light direction of the outgoing light of the lamp tube 3011 corresponding to the partition that satisfies: when the lens component 302 is not set, the outgoing light of the partition can be projected to the vicinity of the center position of the preset eye box area, and the closer to the center position of the preset eye box area, the better. That is to say, in order to enable the imaging of the display panel 20 to be effectively projected on the reflective imaging device, different partitions of the display panel 20 require light with different main light directions. The embodiment of the present application sets the main light direction of the outgoing light of the lamp tube 3011 according to the different partitions of the display panel 20, so that the main light direction of at least part of the outgoing light of the light source 101 after passing through the lamp tube 3011 meets the requirements of the corresponding display panel partition.

[0082] The lens component 302 is arranged on the light-emitting side of the lamp tube component 301, and a lens structure is arranged on the surface of the lens component 302 opposite to the lamp tube component 301, and the lens structure is used to adjust the direction of at least part of the outgoing light of the lamp tube component 301, so that the outgoing light of the display panel can be projected to the center position of the preset eye box area. Specifically, the function of the lens structure is to adjust the direction of at least part of the outgoing light of the lamp tube 3011, that is, after the lamp tube 3011 pre-adjusts the direction of the outgoing light of the corresponding at least one light source 101, the outgoing light of the corresponding partition of the display panel can be projected to the vicinity of the center position of the preset eye box area. On this basis, the lens structure can make a secondary adjustment to the light direction adjusted by the lamp tube 3011, that is, change the direction of most or all of the outgoing light of the lamp tube 3011, so that the outgoing light of the display panel can be projected to the center position of the preset eye box area, thereby improving the accuracy of light direction control. That is to say, according to the requirements of the display panel partition for the main light direction of the lamp tube 3011, the outgoing light of the light source 101 is first preliminarily adjusted through the lamp tube 3011, and the light after the preliminary adjustment by the lamp tube 3011 is further adjusted through the lens structure, so that the outgoing light of the lens component 302 meets the requirements of the light direction required at each position of the display panel.

[0083] The embodiment of the present application uses a lamp tube component 301 and a lens component 302 in combination, and at least one of the lamp tube component 301 and the lens component 302 has the function of gathering light, and can gather the more divergent outgoing light of the light source 101 within a smaller angle range, and the lamp tube 3011 does not have the dispersion problem of the lens, and compared with the lens, the lamp tube 3011 can gather the light of a larger angle emitted by the light source 101, so that the light gathering effect is better and the light efficiency is higher. On this basis, the lamp tube component 301 and the lens component 302 can achieve two adjustments to the direction of the outgoing light of the light source 101, so that the outgoing light of the display panel can be projected to the center position of the preset eye box area more accurately.

[0084] In one example, if Figure 3 As shown, the lamp tube 3011 is entirely composed of a prism-shaped cavity, but the embodiments of the present application are not limited to this. In actual applications, the lamp tube 3011 may also be composed of multiple different prism-shaped media. For example, one part of the lamp tube 3011 is a prism-shaped cavity surrounded by multiple reflective surfaces, and the other part is a prism-shaped transparent medium surrounded by multiple total reflective surfaces. In this case, a part of the reflective surface of the lamp tube 3011 (i.e., the reflective surface of the cavity) is reflective, and the other part (i.e., the reflective surface of the transparent medium) is total reflective.

[0085] Further, at least one light source 101 can be arranged outside the corresponding lamp tube 3011, or can be arranged in the cavity of the corresponding lamp tube 3011 and located at the bottom of the cavity. In the case where the light source 101 is arranged outside the corresponding lamp tube 3011, the lamp tube 3011 can be entirely composed of a prism-shaped cavity, and the opening of the prism-shaped cavity close to one end of the light source is the light inlet 3013, and the light inlet 3013 is arranged opposite to the light emitting surface of at least one light source 101. In one example, the light inlet 3013 of the lamp tube 3011 is spaced apart or fitted with the light emitting surface of at least one corresponding light source 101. Specifically, the light inlet 3013 of the lamp tube 3011 is fitted with the light emitting surface of at least one corresponding light source 101, that is, there is no spacing, which improves the light gathering effect and the effect of improving the light efficiency is best. However, the contact between the lamp tube 3011 and the light source 101 may damage the light source 101. In order to protect the light source 101, the light inlet 3013 of the lamp tube 3011 is spaced from the light emitting surface of at least one of the light sources 101. The space should be as small as possible without damaging the light source 101, so as to improve the light gathering effect and the light efficiency. In one example, the space is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0086] In the case where the light source 101 is disposed in the cavity of the corresponding lamp tube 3011, the lamp tube 3011 may be entirely composed of the cavity, and the cavity is actually divided into two parts, one of which is located above the light emitting surface of the light source 101, that is, used as the above-mentioned prism-shaped cavity with the light entrance 3013 and the light exit 3014. In this case, the light entrance 3013 is the opening of the part of the cavity located above the light emitting surface of the light source 101, close to one end of the light source, and the light entrance 3013 is arranged opposite to the light emitting surface of at least one light source 101. The other part of the cavity is located below the light emitting surface of the light source 101, and this part is used as the accommodation space for the light source.

[0087] By arranging the light source 101 in the cavity of the corresponding lamp tube 3011, all or most of the light emitted by the light source in the cavity can be gathered, light loss is reduced, and there is no problem of damaging the light source. However, due to the limitation of the external packaging size of the light source, when the lamp tube 3011 accommodates the light source, the size of the portion of the lamp tube 3011 located below the light emitting surface of the light source 101 and the size of the light inlet 3013 cannot be designed within a smaller numerical range, and the size of the light outlet 3014 usually needs to be adapted to the partition size of the corresponding display panel and cannot be increased arbitrarily, which results in a smaller size difference between the light inlet 3013 and the light outlet 3014 of the lamp tube 3011, which is not conducive to the light gathering effect of the lamp tube. When the light source 101 is arranged outside the corresponding lamp tube 3011, the size of the light entrance 3013 does not need to consider the external packaging size of the light source 101, but only the light-emitting size of the light source (such as the light-emitting surface size). Therefore, compared with the solution of accommodating the light source in the lamp tube, it is easier to design the size of the light entrance 3013 within a smaller range by arranging the light source outside the lamp tube. Therefore, it is easy to design the lamp tube 3011 with a large size difference between the light entrance 3013 and the light outlet 3014, thereby making the lamp tube have a better light gathering effect.

[0088] In some embodiments, the light entrance 3013 is arranged relative to the light exit surface of at least one light source 101 in such a manner that, on a plane parallel to the light exit surface of the light source 101 , the orthographic projection of the light entrance 3013 completely covers the light exit surfaces of all corresponding light sources 101 .

[0089] It should be noted that, since different partitions of the display panel 20 require light with different main light directions, the main light directions of the outgoing light rays of different lamp tubes 3011 are different. That is to say, different lamp tubes 3011 independently set the main light directions of their respective outgoing light rays according to the projection needs of their respective corresponding partitions (in the case where the lens component 302 is not provided, the outgoing light rays can be projected to the vicinity of the center position of the preset eye box area 300, and the closer to the center position of the preset eye box area, the better). In order to project the outgoing light rays of different partitions to the vicinity of the center position of the preset eye box area 300, it is necessary to design different main light directions of the outgoing light rays of the lamp tubes 3011. It is easy to understand that, by adjusting the main light direction of each outgoing light ray, each lamp tube 3011 can make most of the outgoing light rays of the lamp tube 3011 projected to the vicinity of the center position of the preset eye box area 300 after passing through the corresponding partition of the display panel 20 in the case where the lens component 302 is not provided.

[0090] At least a portion of the lamp tube 3011 that realizes the above-mentioned direction control function is a prism-shaped cavity surrounded by multiple reflective surfaces 3012, with a light inlet 3013 and a light outlet 3014 at both ends. The reflective surface 3012 here refers to a surface that can reflect the light irradiated thereon. The prism-shaped cavity here is limited to a prism shape only for the convenience and simplicity of description. In fact, the shape of the prism-shaped cavity in the embodiment of the present application is not limited to all the properties of the geometric shape of the prism. Figure 4 A prism-shaped cavity is shown, and its shape may be a prism, that is, a geometric shape between the cross section and the bottom surface after a pyramid is cut by a plane parallel to its bottom surface, and the side surface of the geometric shape is the reflection surface 3012, and the two bottom surfaces of the prism are the light inlet 3013 and the light outlet 3014, which have the same shape but different areas. In addition, the angles between different side surfaces and the bottom surface are the same or different.

[0091] Alternatively, the shape of the prism-shaped cavity can also be a shape approximate to a prism, or a shape of a special-shaped prism, that is, it conforms to a part of the properties of the geometric shape of the prism, which can also realize the above-mentioned function of the lamp tube 3011. For example, the side surface of the shape approximate to a prism or a special-shaped prism is also a reflection surface 3012, but at least a part of the reflection surface 3012 can be an arc surface, or a combination of an arc surface and a plane, as long as the condition that the cross-sectional area of ​​the cavity gradually increases from the light entrance 3013 to the light exit 3014 is satisfied. For another example, the two bottom surfaces of the shape approximate to a prism or a special-shaped prism are the above-mentioned light entrance 3013 and light exit 3014, and the shapes of the two can be different, for example, the light entrance 3013 can be circular, and the light exit 3014 is a polygon such as a quadrilateral, a hexagon, etc. For another example, the angle between at least part of the side surface and the bottom surface of the approximate to prism or special-shaped prism is the same or different. Therefore, any cavity in the shape of a prism, a prism-like prism, or an irregular prism that can realize the above-mentioned function of the lamp tube 3011 all fall within the protection scope of the embodiments of the present application.

[0092] In some embodiments, Figure 3As shown, the plane where the light inlet 3013 is located can be parallel to the light emitting surface of the light source 101; the plane where the light outlet 3014 is located can be parallel to the display surface of the display panel 20. Further, the light emitting surface of the light source 101 and the display surface of the display panel 20 can be parallel to each other. In this case, the plane where the light inlet 3013 is located and the plane where the light outlet 3014 is located are parallel to each other. Of course, in practical applications, according to specific needs, the light emitting surface of the light source 101 and the display surface of the display panel 20 can also be at an angle. In this case, the plane where the light inlet 3013 is located and the plane where the light outlet 3014 is located can also be at an angle accordingly. It should be noted that the light source 101 in the embodiment of the present application is, for example, a light emitting device, whose position is fixed, for example, fixed on a lamp board, and the light emitting surface is, for example, parallel to the mounting surface of the lamp board, and the direction of the light emitting surface is also fixed.

[0093] In some embodiments, in order to reduce the difficulty of design and simplify the calculation process, the target direction of the main light direction of the outgoing light of the lamp tube 3011 can be calculated according to the specific situation that most or all of the outgoing light from each partition of the display panel is projected to the central position of the preset eye box area 300, and the corresponding parameters of the lamp tube 3011 (including but not limited to the angle between each reflecting surface 3012 and the light emitting surface of the light source 101) are designed according to the target direction. Then, the number and position of the corresponding light sources 101 are determined according to the position and size of the light inlet 3013 of the designed lamp tube 3011. In this case, since the main light directions of the outgoing light of different lamp tubes 3011 are different, the parameters of at least some of the lamp tubes 3011 are different, which makes the number and position of the light sources 101 corresponding to the lamp tubes 3011 with different parameters may be different, so that the arrangement of multiple light sources 101 may be regular or irregular.

[0094] In some embodiments, in order to achieve different main light directions of the emitted light of different lamp tubes 3011, the adjustment of the main light direction of the emitted light of each lamp tube 3011 can be achieved by adjusting the inclination angle of the lamp tube 3011. The inclination angle of the lamp tube 3011 refers to the angle between the line connecting the center of the light inlet and the center of the light outlet of the lamp tube 3011 and the horizontal plane. The angle can be achieved, for example, by adjusting the angle between each reflective surface 3012 and the plane where the light inlet 3013 and / or the light outlet 3014 are located, that is, adjusting the angle between each reflective surface 3012 and the plane where the light inlet 3013 is located; and / or, the angle between each reflective surface 3012 and the plane where the light outlet 3014 is located. In one example, the size differences (e.g., area differences) between the light outlets 3014 and the light entrances 3013 of different lamp tubes 3011 are different. For example, the shapes and areas of the light entrances 3013 of different lamp tubes 3011 may be the same, and the shapes of the light outlets 3014 may be the same, while the sizes (e.g., areas) of the light exits 3014 may be different. In this case, the angles between the reflective surfaces 3012 of different lamp tubes 3011 and the planes where the light outlets 3013 or the light exits 3014 are located (taking the light outlet 3013 and the light exit 3014 as an example, which are parallel) are different, so as to achieve different main light directions of the outgoing light of different lamp tubes 3011.

[0095] In another example, the shapes and areas of the light entrance ports 3013 of different lamp tubes 3011 may be the same, and the shapes and areas of the light exit ports 3014 may be the same, but the relative positions of the centers of the light exit ports 3014 and the centers of the light entrance ports 3013 are different. In this case, the angles between the reflective surfaces 3012 of different lamp tubes 3011 and the planes where the light entrance ports 3013 or the light exit ports 3014 are located (taking the example where the light entrance ports 3013 and the light exit ports 3014 are parallel) are different, so as to achieve different main light directions of the exiting light of different lamp tubes 3011.

[0096] In some embodiments, for each lamp tube 3011, in order to achieve the adjustment of the main light direction of its outgoing light, the multiple reflective surfaces 3012 are divided into at least two groups of reflective surface groups, each group of reflective surface groups includes two opposite reflective surfaces 3012; and, for at least some of the multiple lamp tubes 3011, the two reflective surfaces 3012 in at least one group of reflective surface groups have different angles with the plane where the light inlet 3013 and / or the light outlet 3014 are located, so as to adjust the main light direction of the outgoing light of the lamp tube 3011. That is to say, in all the lamp tubes 3011, the two reflecting surfaces 3012 in at least one group of reflecting surface groups may have different angles with the plane where the light entrance port 3013 and / or the light exit port 3014 are located; or in some of the lamp tubes 3011, the two reflecting surfaces 3012 in at least one group of reflecting surface groups may have different angles with the plane where the light entrance port 3013 and / or the light exit port 3014 are located, while in other part of the lamp tubes 3011, the two reflecting surfaces 3012 in all the reflecting surface groups may have the same angle with the plane where the light entrance port 3013 and / or the light exit port 3014 are located.

[0097] Specifically, the number of reflective surfaces 3012 of each lamp tube 3011 is an even number, and they are arranged in pairs to form at least two groups of reflective surface groups. In this case, the angles between the two reflective surfaces 3012 in a part of the reflective surface groups and the plane where the light inlet 3013 or the light outlet 3014 is located (taking the light inlet 3013 and the light outlet 3014 as an example of being parallel) can be different, or the angles between the two reflective surfaces 3012 in all the reflective surface groups and the plane where the light inlet 3013 or the light outlet 3014 is located (taking the light inlet 3013 and the light outlet 3014 as an example of being parallel) can be different. The so-called angles between the two reflective surfaces 3012 in a pair and the plane where the light inlet 3013 or the light outlet 3014 is different means that the shape of the lamp tube 3011 in the longitudinal section perpendicular to the two reflective surfaces 3012 in a pair is a non-isosceles trapezoid. Figure 4 The angles between the two paired reflection surfaces 3012 on the left and right sides and the plane where the light outlet 3014 is located are shown to be a1 and a2 respectively, and a1≠a2. In this way, the main light direction of the light emitted by the lamp tube 3011 can be tilted relative to the direction perpendicular to the light outlet surface of the light source 101, that is, the main light direction can be adjusted.

[0098] In some embodiments, the shape of the light outlet 3014 corresponds to the number of the reflective surfaces 3012, that is, the shape of the light outlet 3014 is a polygon, and the number of sides of the polygon is the same as the number of the reflective surfaces 3012, and they correspond one to one. In addition, by making the shape of the light outlet 3014 a polygon, it is easier to achieve a "close connection" between the light outlets 3014 of multiple lamp tubes 3011. The so-called "close connection" means that the interval between the side of each light outlet 3014 and the side of the adjacent light outlet 3014 is as small as possible, or even no interval (such as Figure 5 As shown, two adjacent sides are overlapped or nearly overlapped with the dotted line A), so that the illumination areas (whose shapes are defined by the shapes of the light outlets 3014) formed by the emitted light of adjacent lamp tubes 3011 can be very small (for example, they can be eliminated by diffusing the light), or there is no interval, or they are partially overlapped. For example, Figure 6 A schematic diagram of an illumination area 310 formed by an outgoing light beam of a lamp tube component 301 used in an embodiment of the present application; Figure 7 A schematic diagram of another illumination area 310 formed by the outgoing light of another lamp tube component used in an embodiment of the present application; Figure 6 The illumination area 310 is shown as a square. Figure 7 The illumination regions 310 shown are regular hexagons, and the shapes of the illumination regions 310 are the same. In addition, there is no spacing between each illumination region 310 and the adjacent illumination regions 310, and they are arranged in a "close connection". Figure 6 and Figure 7 It is easy to understand that, compared with a circular light outlet, the sides of adjacent polygonal light outlets 3014 are easier to achieve "close contact". In some examples, the shape of the light outlet 3014 includes a polygon with an even number of sides, such as a rectangle or a hexagon (eg, a regular hexagon).

[0099] In some embodiments, in order to make the illumination areas formed by the emitted light rays of adjacent lamp tubes 3011 "closely connected", as shown in FIG. Figure 5As shown, a plurality of lamp tubes 3011 are arranged in an array, and the side of each light outlet 3014 is adjacent to the side of the adjacent light outlet 3014. Adjacent means that the side of each light outlet 3014 coincides with the side of the adjacent light outlet 3014, or nearly coincides (is next to each other), for example, two adjacent sides coincide with or nearly coincide with the dotted line A. It should be noted that, in the case where the side of each light outlet 3014 is adjacent to the side of the adjacent light outlet 3014, there is no interval or a very small interval between the side of each light outlet 3014 and the side of the adjacent light outlet 3014. In this case, the arrangement of a plurality of lamp tubes 3011 in an array may refer to the arrangement of the light outlets 3014 of the plurality of lamp tubes 3011 in an array, and the light inlets 3013 of the plurality of lamp tubes 3011 may be arranged regularly (for example, arranged in an array) or irregularly according to the respective main light directions. Of course, in actual applications, if there is a gap between the side of each light outlet 3014 and the side of the adjacent light outlet 3014, the array arrangement of multiple lamp tubes 3011 can still refer to the array arrangement of the light outlets 3014 of multiple lamp tubes 3011, and the gaps between the sides of different light outlets 3014 and the sides of adjacent light outlets 3014 can be different. In actual applications, the array shape formed by the array arrangement of multiple lamp tubes 3011 and the number of rows and columns of the rectangular array can be set according to the number and arrangement of partitions of the display panel in actual applications to satisfy the one-to-one correspondence between the lamp tubes 3011 and the partitions. In a specific example, multiple lamp tubes 3011 are arranged in a rectangular array, and the number of rows and columns can be 4×8 (such as Figure 5 ), or 5×9, etc. The light outlets 3014 of the plurality of lamp tubes 3011 are all square, and the side lengths are the same.

[0100] In some embodiments, Figure 5 As shown, in order to simplify the structure and facilitate processing and installation, the overall structure of the lamp tube component 301 is a flat plate-shaped main body, such as a rectangular plate, a square plate, etc., and the shape of the main body can be set according to the shape of the display surface of the display panel. At least a part of the lamp tube 3011 is a prism-shaped cavity formed in the main body. Among them, the light outlet 3014 of the lamp tube 3011 is located on the surface of the main body away from the light source 101. The reflecting surface 3012 can be a surface of a reflecting layer covered on the side of the cavity, and the reflecting layer, such as an aluminum layer, can form a mirror or other film layer on the surface that can reflect light. However, the embodiment of the present application is not limited to this. In actual applications, the overall structure of the lamp tube component 301 can also be a split structure, for example, a plurality of separate prism-shaped shells are used to form a plurality of prism-shaped cavities in a one-to-one correspondence, and a plurality of prism-shaped shells are arranged in an array to form a complete lamp tube component 301.

[0101] In some embodiments, in order to ensure the light gathering effect, the thickness of the lamp tube 3011 in the direction perpendicular to the plane where the light inlet 3013 is located (if the lamp tube is entirely composed of a cavity, the thickness can be called the depth of the cavity) is, for example, greater than or equal to 5 mm and less than or equal to 25 mm, preferably greater than or equal to 8 mm and less than or equal to 12 mm. The thickness (or depth) should not be too small, otherwise it will affect the light gathering effect, and should not be too large, otherwise the brightness will be affected due to excessive light reflection times.

[0102] In some embodiments, when the thickness of the lamp tube 3011 is large and the cross-sectional area of ​​the segment of the lamp tube 3011 near the light entrance 3013 is small, it may be difficult to process the reflective layer on the inner surface of the segment near the light entrance 3013 (for example, coating), which makes the processing difficult and the processing cost high. To solve this problem, the overall structure of the lamp tube component 301 can adopt a segmented structure. Specifically, in one example, Figure 8 As shown, the lamp tube component 301 includes a direction away from the light emitting surface of the light source 101 (ie Figure 8 The first sub-lamp tube component 301a and the second sub-lamp tube component 301b are sequentially arranged in the vertical direction of the light source 101, that is, the first sub-lamp tube component 301a is arranged on the light emitting side of the light source 101, and the second sub-lamp tube component 301b is arranged on the side of the first sub-lamp tube component 301a away from the light source 101, and the surfaces of the first sub-lamp tube component 301a and the second sub-lamp tube component 301b opposite to each other are in contact. Among them, the first sub-lamp tube component 301a is provided with a plurality of first segments 3011a of the lamp tube 3011, and the second sub-lamp tube component 301b is provided with a plurality of second segments 3011b of the lamp tube 3011, and the first segments 3011a and the second segments 3011b correspond to each other one by one, and together constitute a complete lamp tube 3011. For example, the overall structure of the first sub-lamp tube component 301a and the second sub-lamp tube component 301b are two flat-plate-shaped split bodies, which are stacked on each other. A portion of the lamp tube 3011 (i.e., the first segment 3011a) is disposed in one of the split bodies, and another portion of the lamp tube 3011 (i.e., the second segment 3011b) is disposed in the other split body. When the two split bodies are stacked, the two portions of the lamp tube 3011 are combined into one to form a complete lamp tube 3011. By adopting the above-mentioned segmented structure, the lamp tube component 301 can firstly process the two segments of the lamp tube 3011 on the two split bodies respectively. The thickness of the lamp tube segment on each split body is reduced compared to the complete lamp tube 3011, so that it is easier to process the reflective layer on the segment of the lamp tube 3011 near the light inlet 3013, thereby reducing the processing difficulty and cost.

[0103] In some embodiments, the first sub-lamp tube component 301a is perpendicular to the light emitting surface of the light source 101 (ie Figure 8The thickness of the first sub-lamp barrel component 301a in the direction perpendicular to the light emitting surface of the light source 101) is smaller than the thickness of the second sub-lamp barrel component 301b in the direction perpendicular to the light emitting surface of the light source 101. In this way, the fitting surface of the first sub-lamp barrel component 301a and the second sub-lamp barrel component 301b can be closer to the light entrance 3013, so that the depth of the first segment 3011a on the first sub-lamp barrel component 301a can be further reduced, and it is easier to process the reflective layer on the segment of the lamp barrel 3011 near the light entrance 3013. In one example, the thickness of the first sub-lamp barrel component 301a in the direction perpendicular to the light emitting surface of the light source 101 is one-fourth of the overall thickness (the total thickness of the first sub-lamp barrel component 301a and the second sub-lamp barrel component 301b in the direction perpendicular to the light emitting surface of the light source 101), and the processing is cheaper. For example, the thickness of the first sub-lamp barrel component 301a in the direction perpendicular to the light emitting surface of the light source 101 is greater than or equal to 2 mm, and less than or equal to 3 mm. The total thickness of the first sub-lamp tube component 301a and the second sub-lamp tube component 301b in a direction perpendicular to the light emitting surface of the light source 101 is, for example, greater than or equal to 5 mm and less than or equal to 25 mm, preferably greater than or equal to 8 mm and less than or equal to 12 mm.

[0104] In other embodiments, in order to solve the problem that it is difficult to process the reflective layer on the inner surface of the segment near the light inlet 3013, which brings difficulty to processing and high processing cost, it is also possible to use a frustum-shaped transparent solid part to replace the first segment 3011a of the lamp tube 3011 in the above embodiment on the basis of the segmented structure of the lamp tube 3011, that is, the first segment 3011a does not need to be processed with a reflective layer, and there is no problem of high processing difficulty. Specifically, Fig. 9 As shown, the lamp tube component 301 includes a direction away from the light emitting surface of the light source 101 (ie Fig. 9 The first sub-lamp tube component 301a' and the second sub-lamp tube component 301b are sequentially arranged in the vertical direction of the lamp tube 3011, the first sub-lamp tube component 301a' is provided with a plurality of first segments 3011a' of the lamp tube 3011, the second sub-lamp tube component 301b is provided with a plurality of second segments 3011b of the lamp tube 3011, the first segments 3011a' and the second segments 3011b correspond one to one, and together constitute a complete lamp tube 3011. On this basis, the first segment 3011a' is a truncated cone-shaped transparent solid portion with a total reflection surface, and the second segment 3011b is a prism-shaped cavity, the prism-shaped cavity corresponds one to one with the transparent solid portion, and together constitute a complete lamp tube 3011. For example, the first sub-lamp tube component 301a' is composed of a plurality of frustum-shaped transparent solid parts, and the overall structure of the second sub-lamp tube component 301b is a flat-plate-shaped split body, and the light-emitting surface of each frustum-shaped transparent solid part faces the surface of the split body close to the light source 101 (i.e. Fig. 9The light-entering surface of each frustum-shaped transparent solid part is used as the light entrance 3013 of the lamp tube 3011 (the light entrance 3013 here refers to the port that allows light to enter). A prism-shaped cavity is formed in the second sub-lamp tube part 301b (i.e., the flat-plate-shaped split body), and the cavity has openings at both ends, which are respectively located on the surface of the second sub-lamp tube part 301b adjacent to the light source 101 and the surface away from the light source 101, wherein the surface of the second sub-lamp tube part 301b adjacent to the light source 101 (i.e., Fig. 9 The opening of the downward surface of the second sub-lamp tube component 301b is connected to the light incident surface of the corresponding frustum-shaped transparent solid part, and the light emitted from the light incident surface can enter the prism-shaped cavity through the opening; the opening located on the surface of the second sub-lamp tube component 301b away from the light source 101 is used as the light outlet 3014 of the lamp tube 3011. In this case, the outgoing light of the light source 101 can pass through the corresponding frustum-shaped transparent solid part and the prism-shaped cavity in sequence. In this process, the total reflection surface (side) of the frustum-shaped transparent solid part can totally reflect the outgoing light irradiated thereon, and the prism-shaped cavity can reflect the outgoing light irradiated thereon, which can also realize the function of the lamp tube 3011 to gather and control the direction of light. Moreover, due to the provision of the frustum-shaped transparent solid part, it is not necessary to process the reflective layer on the segment of the lamp tube 3011 near the light incident port 3013, thereby reducing the processing difficulty and cost. It should be noted that the total reflection surface of the frustum-shaped transparent solid part totally reflects the light and the reflection surface of the prism-shaped cavity reflects the light, and the two are basically equivalent in the effect of controlling the light direction of the lamp tube, and therefore, they can be used interchangeably.

[0105] In some examples, the outer contour of the light incident surface of the frustum-shaped transparent solid part can be rectangular or circular. For example, when the light incident surface of the frustum-shaped transparent solid part 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.

[0106] In some examples, the light incident surface of the frustum-shaped transparent solid portion 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 frustum-shaped transparent solid portion.

[0107] In some embodiments, the transparent solid part is made of transparent glass with a refractive index greater than 1, and its side surface is a total reflection surface. Alternatively, a silicone material or a plastic PC material may be used.

[0108] In some other embodiments, the first sub-lamp tube component 301a' may further be provided with a flat plate-shaped split body, and each frustum-shaped transparent solid portion is embedded in the flat plate-shaped split body.

[0109] In some embodiments, Figure 3 As shown, the lens structure for realizing the above functions includes, for example, a plurality of lenses 3021 with arc-shaped convex surfaces 3022, and the plurality of lenses 3021 correspond to the light outlets 3014 of the plurality of lamp tubes 3011 one by one; the lens 3021 is used to adjust the main light direction of the outgoing light of the corresponding lamp tube 3011, so as to further enable the outgoing light of the corresponding partition of the display panel 20 to be projected to the center position of the preset eye box area. On this basis, the lens 3021 can also be used to gather the outgoing light of the corresponding lamp tube 3011. Specifically, after the lamp tube 3011 adjusts the direction of the outgoing light of the corresponding at least one light source 101, the lens 3021 performs a secondary adjustment on the light direction adjusted by the lamp tube 3011, that is, changes the main light direction of the outgoing light of the lamp tube 3011, so that the main light direction is closer to the target direction that enables the outgoing light of the corresponding partition to be projected to the center position of the preset eye box area, thereby improving the accuracy of the light direction control. That is to say, according to the requirements of the display panel partition for the main light direction, the output light of the light source 101 is first preliminarily adjusted through the lamp tube 3011, and the light preliminarily adjusted by the lamp tube 3011 is further adjusted through the lens 3021, so that the main light direction of the output light of the lens 3021 meets the requirements of the light direction required by the display panel partition.

[0110] On this basis, the lens 3021 can also be used to further converge the more divergent outgoing light of the corresponding lamp tube 3011 into a smaller angle range, thereby converging the propagation direction of the light. In one example, the lens 3021 can converge the outgoing light of the corresponding lamp tube 3011, so that most or all of the light emitted from the lens 3021 is the converged light along the main light direction of the outgoing light of the lamp tube 3011, that is, the lens 3021 has a converging effect on the outgoing light of the lamp tube 3011.

[0111] In other examples, the direction of the emitted light of the light source 101 can be adjusted by reducing the size of a single lamp tube 3011 and increasing the number of lamp tubes 3011. In this case, since the number of lamp tubes 3011 is sufficient and the size of the light outlet of a single lamp tube 3011 is relatively small, the light can be adjusted more accurately. It should be understood that since the number of display panel partitions and the number of light sources are positively correlated with the number of lamp tubes 3011, the number of lamp tubes 3011 needs to be limited according to specific circumstances in actual applications.

[0112] In some embodiments, Figure 3As shown, the lens 3021 is an eccentric lens, which is mainly used to adjust the main light direction of the corresponding light emitted from the dimming unit 3011, so that the corresponding subarea of ​​the display panel 20 can be projected to the center of the preset eye box area. The so-called eccentric lens means that among the light emitted from the corresponding dimming unit 3011, the angle of the parallel light along the main light direction changes after passing through the center of the arc-shaped convex surface 3022. Fig.10 This is the direction control principle diagram of the eccentric lens, refer to Fig.10 , where D is the aperture of the eccentric lens, d is the eccentric distance, f is the focal length, θ is the eccentric angle, the eccentric angle θ 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 outgoing light of the eccentric lens can be controlled. By adjusting the corresponding parameters of the lens 3021 (including but not limited to the radius of curvature and the pitch of the above-mentioned arc-shaped convex surface 3022), the degree of deflection of the main light direction of the outgoing light of the dimming unit 3011 by the lens 3021 can be adjusted.

[0113] By adjusting the corresponding parameters of lens 3021 (including but not limited to the curvature radius and pitch of the above-mentioned arc-shaped convex surface 3022), the degree of deflection of the main light direction of the outgoing light of the lamp tube 3011 by lens 3021 can be adjusted, thereby adjusting the distribution ratio of the degree of adjustment of the main light direction by the lamp tube component 301 and the lens component 302. Since the accuracy of adjusting the main light direction by the lens component 302 is better than that of the lamp tube component 301, the higher the degree of deflection of the main light direction shared by the lens 3021, the higher the accuracy. However, the maximum thickness of the lens 3021 in the direction perpendicular to the light emitting surface of the light source 101 is greater, and the break of the arc-shaped convex surfaces 3022 of adjacent lenses 3021 at the junction is greater, and the effect on the manufacturing process and light uniformity is average. On the contrary, the lower the deflection degree of the main light direction shared by the lens 3021, the smaller the maximum thickness of the lens 3021 in the direction perpendicular to the light emitting surface of the light source 101, the smaller the break of the arc convex surface 3022 of the adjacent lenses 3021 at the junction, the better the effect in the manufacturing process and light uniformity, but the accuracy is average. Therefore, by adjusting the deflection degree of the main light direction shared by the lamp tube component 301 and the lens component 302, a balance can be achieved between ensuring that the accuracy meets the actual requirements and realizing the manufacturing process and light uniformity of the lens 3021, so that both can meet the actual requirements to a certain extent.

[0114] In other embodiments, Fig.12As shown, the lens structure includes a free-form surface lens 304, which is used to adjust the direction of at least part of the outgoing light of the lamp tube component 301, so that the outgoing light of the display panel can be projected to the center of the preset eye box area. Specifically, the outgoing light of the lamp tube component 301 is adjusted by the free-form surface lens 304, so that the light meets the requirements of the display panel 20, and finally the light can be projected to the center of the preset eye box area of ​​the head-up display device. In practical applications, the surface shape of the free-form surface 3041 of the free-form surface lens 304 can be designed according to the specific requirements of the direction of the outgoing light of the display panel 20, so that the outgoing light of the display panel can be projected to the center of the preset eye box area. It should be noted that in order to realize that the free-form surface lens 304 can adjust the direction of at least part of the outgoing light of all the dimming parts 3011, the free-form surface 3041 of the free-form surface lens 304 should at least cover the area where the light outlet of all the lamp tubes 3011 is located.

[0115] In this embodiment, if Figure 3 and Fig.12 As shown, the lens structure (for example, including a plurality of lenses 3021 or free-form surface lenses 304) is arranged on the surface of the lens component 302 opposite to the lamp tube component 301. Specifically, the lens component 302, for example, also includes a substrate made of the same material as the lens 3021, and the substrate is arranged on the side of the lamp tube component 301 away from the light source 101, and the lens structure is formed on the surface of the substrate close to the lamp tube component 301. Taking the lens structure including a plurality of lenses 3021 as an example, as shown in FIG. Figure 3 As shown, a plurality of lenses 3021 are formed on the surface of the substrate close to the lamp tube component 301, and the arcuate convex surface 3022 of each lens 3021 protrudes in the direction close to the light outlet 3014 of the corresponding lamp tube 3011. In one example, the arcuate convex surface 3022 is a spherical convex surface, that is, a part of the spherical surface is intercepted as the spherical convex surface. In some embodiments, in order to minimize light loss and improve light efficiency, the position of the arcuate convex surface 3022 closest to the corresponding light outlet 3014 is flush with the plane where the light outlet 3014 is located; or, at least a part of the arcuate convex surface 3022 is located in the corresponding lamp tube 3011, that is, it extends into the cavity of the lamp tube 3011 through the corresponding light outlet 3014.

[0116] In other embodiments, Fig.11 and Fig.13As shown, the lens structure (for example, including a plurality of lenses 3021 or free-form surface lenses 304) can also be arranged on the surface of the lens component 302 that is away from the lamp tube component 301. Specifically, the lens component 302, for example, also includes a substrate made of the same material as the lens 3021, and the substrate is arranged on the side of the lamp tube component 301 away from the light source 101, and the lens structure is formed on the surface of the substrate away from the lamp tube component 301. Taking the lens structure including a plurality of lenses 3021 as an example, as shown in FIG. Fig.11 As shown, a plurality of lenses 3021 are formed on the surface of the substrate away from the lamp tube component 301, and the arc-shaped convex surface 3022 of each lens 3021 protrudes in a direction away from the light outlet 3014 of the corresponding lamp tube 3011. The structure and shape of each lens 3021 are the same as those in the above-mentioned embodiment, except that the protrusion direction is opposite, but they can still play the same role. In addition, in some embodiments, the surfaces of the lens component 302 and the lamp tube component 301 facing each other are fitted to reduce light loss and improve light efficiency. For the case where the above-mentioned lens structure includes a free-form surface lens 304, such as Fig.12 As shown, the free-form surface lens 304 is formed on the surface of the substrate close to the lamp tube component 301, or, as shown in FIG. Fig.13 As shown, it can also be formed on the surface of the substrate away from the lamp tube component 301.

[0117] In some embodiments, when the lens structure includes a plurality of lenses 3021, when a plurality of lamp tubes 3011 are arranged in an array, the plurality of lenses 3021 are also arranged in an array and correspond one to one with the plurality of lamp tubes 3011. Moreover, the arcuate convex surfaces 3022 of adjacent lenses 3021 may also be arranged "closely", that is, the adjacent arcuate convex surfaces 3022 are adjacent to each other, with no interval or a very small interval, so as to improve brightness uniformity.

[0118] Second embodiment

[0119] See also Fig.14 The direction control component 30 provided in the second embodiment of the present application is based on the above-mentioned first embodiment, and a diffusion structure 303 is added. Fig.14 The position of the diffusion structure 33 is schematically shown using a rectangular frame, and its specific structure is not shown.

[0120] Specifically, when the lens structure (for example, including a plurality of lenses 3021 or a free-form surface lens 304) is disposed on the surface of the lens component 302 opposite to the lamp tube component 301, as shown in FIG. Fig.15 and Fig.16As shown, the diffusion structure 303 is arranged on the surface of the lens component 302 away from the lamp tube component 301. The diffusion structure 303 is used to diffuse the outgoing light of the lens component 302 so as to diffuse the outgoing light of the display panel and form a light spot covering the entire preset eye box area.

[0121] Specifically, Figure 2 Taking the preset eye box area 300 as an example, when the emitted light of the lens component 302 does not pass through the diffusion structure 303, most or all of the emitted light of each pixel of the display panel 20 can be projected to the center position of the preset eye box area 300 to improve the light brightness. The center position can be a point position or a very small area. Taking the center position as the eye box center area 300a as an example, most of the light emitted from different positions of the display panel 20 will be emitted to the eye box center area 300a. At the same time, if the light emitted from different positions is only gathered to a point or a very small area without passing through the diffusion structure 303, the observer can only see the image output by the head-up display device in a very small range, which makes it inconvenient for the observer to watch. In this regard, by diffusing the light through the diffusion structure 303, each light adjusted by the lamp tube 3011 and the lens 3021 can be dispersed into multiple light rays to form a light spot as large as possible, which, for example, covers the entire preset eye box area 300, so that the observer can see the image formed by the image light when both eyes are at any position in the preset eye box area. For example, the center of the eye box central area 300a coincides with the center of the preset eye box area 300. The shape of the eye box central area 300a and the preset eye box area 300 can be the same or different.

[0122] By setting the diffusion structure 303 on the surface of the lens component 302 facing away from the lamp tube component 301, the diffusion structure 303 and the above-mentioned lens structure can be integrated into the same component, for example, set on two opposite surfaces of the same substrate, thereby reducing the number of components, reducing light loss and improving lighting efficiency.

[0123] In other embodiments, when the lens structure (for example, including a plurality of lenses 3021 or a free-form surface lens 304) is disposed on a surface of the lens component 302 that is away from the lamp tube component 301, Fig.11 , Fig.13 and Fig. 20 As shown, the diffusion structure 303 is arranged on the light-emitting surface of the lens structure. Taking the lens structure including a plurality of lenses 3021 as an example, Fig.11 and Fig. 20 As shown, the diffusion structure 303 is arranged on the arcuate convex surface 3022 of the lens 3021 (ie, the light emitting surface of the lens structure). Similarly, for the case where the above lens structure includes a free-form surface lens 304, as shown in FIG. Fig.13As shown, the diffusion structure 303 is arranged on the free-form surface 3041 (ie, the light emitting surface of the lens structure) of the free-form surface lens 304 . Fig.11 and Fig.13 The diffusion structure 303 is not shown. The diffusion structure 303 has the same function as in the above embodiment and is also integrated with the lens structure in the same component, for example, both are arranged on the surface of the same substrate away from the light source 101, so as to reduce the number of components, reduce light loss, and improve light efficiency. Of course, in practical applications, the lens structure and the diffusion structure 303 can also be two independent components, for example, they are respectively arranged on two substrates.

[0124] In some embodiments, Figures 15 to 17 As shown, the dispersion structure 303 includes a first preset direction (i.e., parallel to Fig.15 and Fig.16 The plurality of strip-shaped concave portions 3032 and the plurality of strip-shaped convex portions 3031 are arranged in sequence along the extension direction of the middle dotted line Y2, and the strip-shaped concave portions 3032 and the strip-shaped convex portions 3031 are alternately arranged in the first preset direction; the length directions of the strip-shaped concave portions 3032 and the strip-shaped convex portions 3031 are both parallel to the second preset direction (i.e., parallel to Fig.15 and Fig.16 The second preset direction intersects the first preset direction. Specifically, in the case where the lens 3021 is disposed on the surface of the lens component 302 opposite to the lamp tube component 301, a plurality of strip-shaped recesses 3032 and a plurality of strip-shaped protrusions 3031 are, for example, formed on the surface of the lens component 302 away from the lamp tube component 301, or in the case where the lens 3021 is disposed on the surface of the lens component 302 away from the lamp tube component 301, a plurality of strip-shaped recesses 3032 and a plurality of strip-shaped protrusions 3031 are, for example, formed on the arcuate convex surface 3022 of the lens 3021 (i.e., the light emitting surface of the lens component 302). Furthermore, the arrangement direction of the strip-shaped concave portions 3032 and the strip-shaped convex portions 3031 forms an angle with the length direction of the two (the angle between the dotted line Y1 and the dotted line Y2), and the size of the angle (or the angle between the dotted line Y1 and the dotted line Y3) can be set according to the actual required divergence angle of the emitted light of the diffusion structure 303. In one example, as Fig.15 As shown, when the diffuse structure 303 is disposed on a rectangular substrate, the length direction of the rectangular substrate (i.e., parallel to Fig.15 The extending direction of the dotted line Y2) corresponds to the length direction of the preset eye box area with a rectangular shape, and the width direction (i.e., parallel to Fig.15The extension direction of the middle dotted line Y3) corresponds to the width direction of the preset eye box area in the shape of a rectangle, and the width direction of the preset eye box area is smaller than the length direction. Even without the diffusion effect of the diffusion structure 303, after the light emitted by the light source 101 is adjusted through the lamp tube 3011, or through the lamp tube 3011 and the lens 3021 in sequence, the angular size of the outgoing light of each partition of the display panel 20 can still meet the diffusion requirement of the outgoing light in the width direction of the preset eye box area, and there is no need to set the diffusion structure 303. As for the length direction of the preset eye box area, the angular size of the outgoing light of each partition of the display panel is insufficient, and the diffusion structure 303 needs to be set. In other words, the diffusion structure 303 only plays a role in light diffusion in the length direction of the preset eye box area. Based on this, the above-mentioned first preset direction can be set to be parallel to the length direction of the rectangular substrate (that is, parallel to Fig.15 The second predetermined direction (i.e., parallel to the extending direction of the dashed line Y2) is parallel to Fig.15 The extending direction of the dashed line Y1 in the middle) can be set to be parallel to the width direction of the rectangular substrate (i.e., parallel to Fig.15 The extending direction of the dotted line Y3 forms an angle, and the angle (the angle between the dotted line Y1 and the dotted line Y3) is, for example, 3°.

[0125] In some embodiments, Fig.17 As shown, the inner surface of the strip-shaped concave portion 3032 is an arc-shaped concave surface 3032a that is concave toward the inside of the substrate, and the outer surface of the strip-shaped convex portion 3031 is an arc-shaped convex surface 3031a that is convex toward the outside of the substrate. The arc-shaped convex surface 3031a of the strip-shaped convex portion 3031 is used to converge the light received by it. The arc-shaped concave surface 3032a of the strip-shaped concave portion 3032 is used to diverge the light received by it. The parameters such as the curvature radius and pitch of the arc-shaped concave surface and the arc-shaped convex surface 3031a can be set according to the actual divergence needs.

[0126] By arranging the strip-shaped concave portions 3032 and the strip-shaped convex portions 3031 alternately in the first preset direction, the diffusion effect of the diffusion structure 303 on the light at different positions in the length direction of the preset eye box area can be made more uniform. In addition, the strip-shaped concave portions 3032 and the strip-shaped convex portions 3031 can be closely arranged, so that the light-emitting surface of the lens component 302 forms a smooth wavy surface, so that each position of the light-emitting surface of the lens component 302 can diffuse the light, and the transition position between the strip-shaped concave portions 3032 and the strip-shaped convex portions 3031 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.

[0127] In other embodiments, the diffusion structure 303 may also include only a plurality of strip-shaped concave portions 3032 or a plurality of strip-shaped convex portions 3031. In the case of only including the strip-shaped convex portions 3031, as shown in FIG. Fig.18 As shown, the plurality of strip-shaped protrusions 3031 are arranged in sequence along the first preset direction, and the length direction is parallel to the second preset direction, and the second preset direction intersects with the first preset direction. Fig.19 As shown, the plurality of strip-shaped recesses 3032 are sequentially arranged along the first preset direction, and the length direction is parallel to the second preset direction, and the second preset direction intersects with the first preset direction. Figures 17 to 19 , the light is converged after being incident on the arc-shaped convex surface 3031a, and gradually diverges on the side of the focal plane S2 of the strip convex portion 3031 away from the strip convex portion 3031; the light is diverged after being incident on the arc-shaped concave surface 3032a, and 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 of the strip concave portion 3032 away from the strip concave portion 3032, the light can achieve a better diffusion effect.

[0128] As another aspect of the present application, the embodiment of the present application further provides a backlight source, including: a plurality of light sources 101 and a direction control component 30, the direction control component 30 is arranged on the light-emitting side of the plurality of light sources 101, and the direction control component 30 provided in the above-mentioned embodiments of the present application can be adopted. The backlight source provided in the embodiment of the present application can enable the outgoing light of each partition of the display panel to be projected to the center position of the preset eye box area by adopting the direction control component 30 provided in the above-mentioned embodiments of the present application, so that the first embodiment of the present application can realize the functions of light gathering and direction control through the lamp tube component 301, which significantly reduces the number of components compared with the prior art, thereby reducing the loss of light and further improving the backlight light effect.

[0129] In some embodiments, the light source 101 includes a light-emitting device. In some examples, the light-emitting device 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), an LED cold light source (CLL), electroluminescence (EL), electron emission (FED), a tungsten halogen lamp or a metal halide lamp, etc., and the embodiments of the present application are not limited to this.

[0130] In some embodiments, Figure 3 For example, one light source 101 (eg, one light emitting device) may be disposed corresponding to the light entrance 3013 of one lamp tube 3011 , or a plurality of light sources 101 arranged in an array may correspond to the light entrance 3013 of one lamp tube 3011 . In order to reduce the design difficulty and simplify the calculation process, the target direction of the main light direction of the outgoing light of the lamp tube 3011 can be calculated according to the specific situation that most or all of the outgoing light of each partition of the display panel is projected to the central position of the preset eye box area 300, and the corresponding parameters of the lamp tube 3011 (including but not limited to the angle between each reflective surface 3012 and the light emitting surface of the light source 101) are designed according to the target direction, so that the main light direction of the outgoing light of the lamp tube 3011 is or approaches the target direction, and then the number and position of the corresponding light source 101 are determined according to the position and size of the light inlet 3013 of the designed lamp tube 3011. In this case, since the main light directions of the outgoing light of different lamp tubes 3011 are different, the parameters of at least some of the lamp tubes 3011 are different, which makes the number and position of the light source 101 corresponding to the lamp tubes 3011 with different parameters may be different, so that the arrangement of multiple light sources 101 may be regular or irregular. Based on this, the position of the light source 101 can be set according to the main light direction of the corresponding lamp tube 3011. Of course, in practical applications, a plurality of regularly arranged light sources 101 may be used, and the lamp tube 3011 may be designed according to the arrangement of the light sources 101 and the requirements of the display panel for the direction of the main light in the partitions.

[0131] In some embodiments, at least one light source 101 can be disposed outside the corresponding lamp tube 3011, or can be disposed in the cavity of the corresponding lamp tube 3011 and located at the bottom of the cavity. In the case where the light source 101 is disposed outside the corresponding lamp tube 3011, the lamp tube 3011 can be entirely composed of a prism-shaped cavity, and the opening of the prism-shaped cavity close to one end of the light source is the light inlet 3013, and the light inlet 3013 is disposed opposite to the light emitting surface of at least one light source 101. In one example, the light inlet 3013 of the lamp tube 3011 is spaced apart or fitted with the light emitting surface of at least one corresponding light source 101. Specifically, the light inlet 3013 of the lamp tube 3011 is fitted with the light emitting surface of at least one corresponding light source 101, that is, there is no spacing, which improves the light gathering effect and the effect of improving the light efficiency is best. However, the contact between the lamp tube 3011 and the light source 101 may damage the light source 101. In order to protect the light source 101, the light inlet 3013 of the lamp tube 3011 is spaced from the light emitting surface of at least one of the light sources 101. The space should be as small as possible without damaging the light source 101, so as to improve the light gathering effect and the light efficiency. In one example, the space is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0132] In the case where the light source 101 is disposed in the cavity of the corresponding lamp tube 3011, the lamp tube 3011 may be entirely composed of the cavity, and the cavity is actually divided into two parts, one of which is located above the light emitting surface of the light source 101, that is, used as the above-mentioned prism-shaped cavity with the light entrance 3013 and the light exit 3014. In this case, the light entrance 3013 is the opening of the part of the cavity located above the light emitting surface of the light source 101, close to one end of the light source, and the light entrance 3013 is arranged opposite to the light emitting surface of at least one light source 101. The other part of the cavity is located below the light emitting surface of the light source 101, and this part is used as the accommodation space for the light source.

[0133] By arranging the light source 101 in the cavity of the corresponding lamp tube 3011, all or most of the light emitted by the light source in the cavity can be gathered, light loss is reduced, and there is no problem of damaging the light source. However, due to the limitation of the external packaging size of the light source, when the lamp tube 3011 accommodates the light source, the size of the portion of the lamp tube 3011 located below the light emitting surface of the light source 101 and the size of the light inlet 3013 cannot be designed within a smaller numerical range, resulting in a smaller size difference between the light inlet 3013 and the light outlet 3014 of the lamp tube 3011, which is not conducive to the light gathering effect of the lamp tube. When the light source 101 is arranged outside the corresponding lamp tube 3011, the size of the light entrance 3013 does not need to consider the external packaging size of the light source 101, but only the light-emitting size of the light source (such as the light-emitting surface size). Therefore, compared with the solution of accommodating the light source in the lamp tube, it is easier to design the size of the light entrance 3013 within a smaller range by arranging the light source outside the lamp tube. Therefore, it is easy to design the lamp tube 3011 with a large size difference between the light entrance 3013 and the light outlet 3014, thereby making the lamp tube have a better light gathering effect.

[0134] In some embodiments, Figure 3 For example, the light emitting surfaces of each light source 101 are in the same horizontal plane and are arranged opposite to the light entrance 3013 of the corresponding lamp tube 3011, which helps to make the light uniform and can also reduce the thickness of the backlight source.

[0135] In some embodiments, Fig.21 As shown, the backlight source also includes a homogenizing and dispersing element 40, which is disposed between the direction control component 30 and the display panel 20 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.

[0136] 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, and the size and shape of the formed light spot are controllable.

[0137] As another aspect of the present application, an embodiment of the present application also provides an image source in a head-up display device, including: the above-mentioned backlight source provided in the embodiment of the present application; and a display panel, which is arranged on the light output side of the backlight source, and is used to convert the light of the backlight source into image light and output it to a preset eye box area.

[0138] The display panel includes a plurality of pixel units, each of which may include a plurality of pixels. For example, each of the pixel units includes a red pixel, a green pixel, and a blue pixel.

[0139] In some embodiments, the display panel may include an array substrate, a color filter substrate, and a liquid crystal layer located therebetween that 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, so as to reduce the proportion of the display panel converting the backlight into heat energy, reduce the temperature rise of the display panel, and thereby extend the service life of the display panel.

[0140] 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.

[0141] like Fig. 22 As shown, in some embodiments, the image source 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.

[0142] 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. 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 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.

[0143] 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.

[0144] 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 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 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.

[0145] In some embodiments, the polarization control element 24 is a reflective polarization reflective film, which can be specifically DBEF (double 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.

[0146] In some embodiments, the polarization control element 24 and the homogenizing and dispersing element 40 are two different elements; in other embodiments, 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.

[0147] As another aspect of this application, Fig.23 As shown, the embodiment of the present application further provides a head-up display device, including the above-mentioned image source provided in the embodiment of the present application; 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 eye box area 300.

[0148] In some embodiments, Fig.23 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.

[0149] 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.

[0150] In some embodiments, the magnifying element 501 may be a curved reflector, and optionally, the curved reflector is a concave reflector, that is, the reflective surface 3012 is a reflector with a concave 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.

[0151] In some embodiments, the curved reflector is a free-form reflector, that is, the reflective surface 3012 is a free-form reflector, or the reflective surface 3012 does not have rotational symmetry, so as to improve the imaging quality of the head-up display device.

[0152] In other embodiments, the amplifying element 501 may be an optical waveguide or a holographic optical element.

[0153] like Fig.23 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.

[0154] As another aspect of this application, Fig.24 As shown, the embodiment of the present application further provides a vehicle, which includes the above-mentioned head-up display device provided in the embodiment of the present application; and a windshield 200. The windshield 200 is used to reflect the image light emitted by the head-up display device to the preset eye box area 300.

[0155] 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 eye box area 300. At the same time, the light 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, the observer 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 light and reflecting 50% of light. For example, the transmittance of visible light is greater than or equal to 70%.

[0156] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present application, but the present application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of the present application, and these modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A direction control component, applied to a backlight source of a head-up display device, characterized in that: include: A lamp tube component, wherein a plurality of lamp tubes are arranged in the lamp tube component; The plurality of lamp tubes correspond one-to-one to the plurality of partitions of the display panel of the head-up display device; At least a portion of the lamp tube is a prism-shaped cavity surrounded by a plurality of reflective surfaces, with a light inlet and a light outlet at both ends, the area of ​​the light inlet is smaller than the area of ​​the light outlet, and the light inlet is used to be arranged opposite to the light outlet surface of at least one light source; The lamp tube is used to pre-adjust the direction of at least part of the emitted light of the corresponding at least one light source according to the main light direction required by the corresponding partition; A lens component is arranged on the light-emitting side of the lamp tube component, and a lens structure is arranged on the surface of the lens component opposite to or away from the lamp tube component, and the lens structure is used to adjust the direction of at least part of the outgoing light of the lamp tube component so that the outgoing light of the display panel can be projected to the center position of a preset eye box area.

2. The direction control assembly according to claim 1, characterized in that: The plurality of reflection surfaces are divided into at least two reflection surface groups, each reflection surface group comprising two opposite reflection surfaces; For at least some of the multiple lamp tubes, two of the reflective surfaces in at least one group of the reflective surface groups have different angles with the plane where the light entrance and / or the light exit are located, so as to adjust the main light direction of the outgoing light of the lamp tube.

3. The direction control assembly according to claim 1, characterized in that: The shape of the light outlet includes a rectangle or a hexagon.

4. The direction control assembly according to claim 1, characterized in that: A plurality of the lamp tubes are arranged in an array, and a side edge of each light outlet is adjacent to a side edge of an adjacent light outlet.

5. The direction control assembly according to any one of claims 1 to 4, characterized in that: The lens structure includes a plurality of lenses with curved convex surfaces, and the plurality of lenses correspond one-to-one to the light outlets of the plurality of lamp tubes; the lenses are used to adjust the main light direction of the corresponding light emitted from the lamp tubes so that the light emitted from the corresponding partition of the display panel can be projected to the center position of the preset eye box area.

6. The direction control assembly according to claim 5, characterized in that: The lens is a decentered lens.

7. The direction control assembly according to claim 6, characterized in that: The lens is arranged on the surface of the lens component opposite to the lamp tube component, and the closest position of the arcuate convex surface to the corresponding light outlet is flush with the plane where the light outlet is located; or, at least a part of the arcuate convex surface is located in the corresponding lamp tube.

8. The direction control assembly according to any one of claims 1 to 4, characterized in that: The lens structure comprises a free-form surface lens, and the free-form surface lens is used to adjust the direction of at least part of the outgoing light of the lamp tube component so that the outgoing light of the display panel can be projected to the center position of the preset eye box area.

9. The direction control assembly according to claim 1, characterized in that: The lens structure is arranged on the surface of the lens component opposite to the lamp tube component, and a diffusion structure is arranged on the surface of the lens component away from the lamp tube component, and the diffusion structure is used to diffuse the outgoing light of the lens component so as to diffuse the outgoing light of the display panel and form a light spot covering the entire preset eye box area.

10. The direction control assembly according to claim 1, characterized in that: The lens structure is arranged on the surface of the lens component opposite to the lamp tube component, and a diffusion structure is formed on the light-emitting surface of the lens structure, and the diffusion structure is used to diffuse the outgoing light from the light-emitting surface of the lens structure, so that the outgoing light of the display panel is diffused and forms a light spot covering the entire preset eye box area.

11. The direction control assembly according to claim 9 or 10, characterized in that: The diffusion structure comprises a plurality of strip-shaped concave portions and a plurality of strip-shaped convex portions arranged in sequence along a first preset direction, and the strip-shaped concave portions and the strip-shaped convex portions are alternately arranged in the first preset direction; the length directions of the strip-shaped concave portions and the strip-shaped convex portions are both parallel to a second preset direction, and the second preset direction intersects with the first preset direction; or, The dispersion structure includes a plurality of strip-shaped concave portions or a plurality of strip-shaped convex portions arranged in sequence along a first preset direction, wherein the length direction of the strip-shaped concave portions or the strip-shaped convex portions is parallel to a second preset direction, and the second preset direction intersects with the first preset direction.

12. The direction control assembly according to any one of claims 1 to 4, characterized in that: The lamp tube component includes a first sub-lamp tube component and a second sub-lamp tube component which are arranged in sequence along a direction away from the light emitting surface of the light source. The first sub-lamp tube component is provided with a plurality of first segments of the lamp tube, and the second sub-lamp tube component is provided with a plurality of second segments of the lamp tube. The first segments and the second segments correspond one to one and together constitute the complete lamp tube.

13. The direction control assembly according to claim 12, characterized in that: The first segment is a first sub-prism-shaped cavity, the second segment is a second sub-prism-shaped cavity, and the first sub-prism-shaped cavity and the second sub-prism-shaped cavity together constitute the complete lamp tube.

14. The direction control assembly according to claim 12, characterized in that: The first segment is a truncated cone-shaped transparent solid part with a total reflection surface, and the second segment is the prism-shaped cavity. The prism-shaped cavity corresponds to the transparent solid part one by one, and together they constitute the complete lamp tube.

15. The direction control assembly according to claim 14, characterized in that: The outer contour of the light incident surface of the frustum-shaped transparent solid part is circular or rectangular.

16. The direction control assembly according to claim 14, characterized in that: The light incident surface of the frustum-shaped transparent solid part is a plane or a free-curved surface.

17. A backlight source, characterized in that: include: Multiple light sources; The direction control component as described in any one of claims 1 to 16, wherein the direction control component is arranged on the light output side of the plurality of light sources.

18. The backlight source according to claim 17, characterized in that: The position of the light source is configured to be set according to the main light direction of the corresponding lamp tube.

19. The backlight source according to claim 17, wherein: The light entrance is spaced apart from or closely attached to a light emitting surface of at least one of the light sources.

20. The backlight source according to claim 17, wherein: The lamp tube is entirely composed of a cavity, the portion of the cavity located above the light emitting surface of the corresponding at least one light source is the prism-shaped cavity, and the portion of the cavity located below the light emitting surface of the light source is used to accommodate the corresponding at least one light source.

21. An image source, characterized in that: include: The backlight source according to any one of claims 17 to 20; The display panel is arranged on the light-emitting side of the backlight source, and is used for converting the light of the backlight source into image light and outputting it to a preset eye box area.

22. A head-up display device, characterized in that: include: The image source as claimed in claim 21; A reflective imaging element is used to receive the image light and output the image light to the preset eye box area.

23. A vehicle, characterized in that: include: The head-up display device as claimed in claim 22; A windshield is used to reflect the image light emitted by the head-up display device to the preset eye box area.

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