Backlight module, display screen, rearview mirror, vehicle

Abstract

The application relates to a backlight module, a display screen, a rearview mirror and a vehicle, and relates to the technical field of display technology. The backlight module can greatly reduce the risk of separation of a reflection unit (8) and a light guide plate (1). The backlight module comprises the light guide plate (1), a light emitting unit (7) and a reflection unit (8). The light guide plate (1) comprises a light emitting surface (101) and a backlight surface (102) arranged oppositely and a side surface (100), the side surface (100) comprises a first sub-side surface (103) and a second sub-side surface (104) connected to each other; the light emitting unit (7) is arranged on the first sub-side surface (103) of the light guide plate (1); the reflection unit (8) comprises a main reflection unit (9) and a side reflection unit (10), the side reflection unit (10) is arranged on the second sub-side surface (104) of the light guide plate (1); the side reflection unit (10) comprises at least a first side reflection sub-unit (11) and a plurality of connecting portions (12), the first side reflection sub-unit (11) comprises at least a plurality of first reflection portions (13), the first reflection portion (13) is connected to at least one connecting portion (12), and a part of the first reflection portion (13) not connected to the connecting portion (12) is provided with a first gap (14) between the main reflection unit (9), and a second gap (15) is arranged between adjacent first reflection portions (13).

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a backlight module, a display screen, a rearview mirror, and a vehicle. Background Technology

[0002] As automotive products demand increasingly higher brightness from display modules, the high-temperature range that edge-lit backlights must withstand is becoming more stringent. This places higher demands on the structure of the backlight module. Summary of the Invention

[0003] The embodiments of this application adopt the following technical solutions:

[0004] On the one hand, a backlight module is provided, including:

[0005] A light guide plate includes a light-emitting surface and a backlight surface disposed opposite to each other, and a side surface, wherein the side surface is connected to the light-emitting surface and the backlight surface respectively; the side surface includes a first sub-side surface and a second sub-side surface connected together.

[0006] A light-emitting unit is disposed on the first sub-side surface of the light guide plate;

[0007] A reflective unit, comprising a main reflective unit and a side reflective unit, wherein the main reflective unit is disposed on the back surface of the light guide plate, and the side reflective unit is disposed on the second sub-side surface of the light guide plate; wherein the side reflective unit comprises at least a first side reflective sub-unit and a plurality of connecting portions, the plurality of connecting portions being connected to the main reflective unit, the first side reflective sub-unit comprising at least a plurality of first reflective portions, the first reflective portion being connected to at least one of the connecting portions, and a first gap existing between the portion of the first reflective portion not connected to the connecting portion and the main reflective unit, and a second gap being disposed between adjacent first reflective portions.

[0008] Optionally, the first reflective part is connected to the main reflective unit through the three connecting parts.

[0009] Optionally, the two ends and the middle position of the first reflective portion are each connected to one of the connecting portions.

[0010] Optionally, the two ends of the first reflective portion are a first end and a second end, respectively;

[0011] In two adjacent first reflective portions, a third gap is provided between the connecting portion connected to the second end of one of the first reflective portions and the connecting portion connected to the first end of the other first reflective portion, and the position of the third gap corresponds to the position of the second gap.

[0012] Optionally, the first reflective portion includes a first reflective layer and a first adhesive layer, wherein the first reflective layer is connected to at least one of the connecting portions and is fixed to the second sub-side surface through the first adhesive layer; the first reflective layer and the connecting portion are an integral structure.

[0013] Optionally, the multiple connecting parts may have the same size.

[0014] Optionally, the width of the connecting portion along the first preset direction is in the range of 0.5-3mm.

[0015] Optionally, the distance between adjacent first reflective portions along a first preset direction is in the range of 0.1-0.3 mm.

[0016] Optionally, the second sub-side includes a first part, a second part, and a third part disposed opposite to each other. The third part is connected to the first part and the second part respectively, and the first sub-side is connected to the first part and the second part respectively and disposed opposite to the third part.

[0017] The side-reflecting unit includes a first side-reflecting subunit and a plurality of connecting portions, wherein the first portion, the second portion and the third portion are respectively provided with the first side-reflecting subunit.

[0018] Optionally, the ratio of the length of the first part along the first direction to the length of the third part along the second direction is L, where 0.8 ≤ L ≤ 1, and the first direction intersects the second direction.

[0019] Optionally, the second sub-side includes a first part, a second part, and a third part disposed opposite to each other. The third part is connected to the first part and the second part respectively, and the first sub-side is connected to the first part and the second part respectively and disposed opposite to the third part.

[0020] The side reflection unit further includes a second side reflection subunit, which is not connected to the main reflection unit; the first part and the second part are respectively provided with the second side reflection subunit, and the third part is provided with the first side reflection subunit.

[0021] Optionally, the second side reflective subunit includes a reflective film and an adhesive film, wherein the reflective film is fixed to the second side surface via the adhesive film.

[0022] Optionally, the ratio of the length of the first part along the first direction to the length of the third part along the second direction is L, where 1 / 5 ≤ L ≤ 1 / 2, and the first direction intersects the second direction.

[0023] Optionally, the second sub-side includes a first part, a second part, and a third part disposed opposite to each other. The third part is connected to the first part and the second part respectively, and the first sub-side is connected to the first part and the second part respectively and disposed opposite to the third part.

[0024] The third part is provided with the first side reflector subunit, and the first part and the second part are provided with either the first side reflector subunit or the second side reflector subunit; the first side reflector subunit provided on the third part is a fixed side reflector subunit.

[0025] The fixed-side reflective subunit further includes a second reflective portion. The fixed-side reflective subunit is formed by a plurality of first reflective portions. The fixed-side reflective portion has second reflective portions at both ends, and the fixed-side reflective portion is not connected to the second reflective portion. The second reflective portion is connected to the main reflective unit.

[0026] The backlight module further includes a fixing unit, which is disposed on the side of the second reflective part away from the third part, and the orthographic projection of the fixing unit on the third part is located within the orthographic projection of the second reflective part on the third part.

[0027] Optionally, in the fixed-side reflective subunit, the two ends and the middle position of the first reflective part are respectively connected to one of the connecting parts;

[0028] A groove is provided between the fixed-side reflector subunit and the second reflector.

[0029] Optionally, the width of the second reflective portion in the direction perpendicular to the second preset direction is the same as the width of the whole formed by the first reflective portion and the connecting portion in the direction perpendicular to the second preset direction.

[0030] Optionally, the second reflective portion includes a second reflective layer and a second adhesive layer, the second reflective layer being fixed to the third portion via the second adhesive layer; the main reflective unit includes a main reflective layer; the second reflective layer is connected to the main reflective layer;

[0031] The main reflective layer, each of the second reflective layers, each of the first reflective layers, and each of the connecting portions are an integral structure.

[0032] On the other hand, a display screen is provided, including: a display panel and the aforementioned backlight module, wherein the backlight module is disposed on the backlight side of the display panel.

[0033] On the other hand, a rearview mirror is provided, including the aforementioned display screen.

[0034] In another aspect, a vehicle is provided, including: the aforementioned rearview mirror, the rearview mirror being disposed in the interior space of the vehicle.

[0035] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic diagram of a backlight module is shown.

[0038] Figure 2 For along Figure 1 Cross-sectional view in the CC' direction;

[0039] Figure 3 In the figure, Figure a shows the curves of the thermal shrinkage rate of materials A and B in the MD direction (coil direction) as a function of time at a high temperature of 95℃, and Figure b shows the curves of the thermal shrinkage rate of materials A and B in the TD direction (non-coil direction) as a function of time at a high temperature of 95℃.

[0040] Figure 4 and Figure 5 The schematic diagrams of two other backlight modules are shown.

[0041] Figure 6 For along Figure 5 Cross-sectional view in the DD' direction;

[0042] Figure 7 for Figure 5 An enlarged schematic diagram of the first side reflective subunit located on the upper side of the light guide plate;

[0043] Figure 8-10 The schematic diagrams of three other backlight modules are shown.

[0044] Figure 11 For along Figure 10 Cross-sectional view in the C1C1' direction;

[0045] Figure 12A schematic diagram of another type of backlight module is shown.

[0046] Figure 13 for Figure 12 An enlarged schematic diagram of the first side reflector unit located on the upper side of the light guide plate. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In the embodiments of this application, the terms "first," "second," and "third," etc., are used to distinguish identical or similar items with substantially the same function and effect, solely for the purpose of clearly describing the technical solutions of the embodiments of this application, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Furthermore, "multiple" means two or more, and "at least one" means one or more, unless otherwise explicitly defined.

[0049] The in-vehicle streaming rearview mirror uses a rear-mounted camera to capture real-time images of what's behind the vehicle and displays them on the mirror's screen. This allows for a view of the actual situation behind the vehicle from the camera's perspective, significantly reducing blind spots and enhancing night vision. The in-vehicle streaming rearview mirror is equipped with an EC mirror (Electro-Chromic Mirro), which has a light transmittance of approximately 30%-40%. To ensure optimal image quality, the mirror's brightness needs to be at least 1000 nits. If the display screen is an LCD, the backlight module's brightness must be at least 3000 nits to meet imaging requirements. In contrast, conventional in-vehicle instrument clusters or center consoles have a brightness of 800-1200 nits. Compared to these requirements, the higher the brightness of the rearview mirror's backlight module, the higher the temperature range it needs to withstand. To reduce size and achieve a thinner profile, the backlight module can utilize a side-lit backlight structure.

[0050] Combination Figure 1 and Figure 2As shown, the backlight module may include a light guide plate 1, a reflector sheet, and an LED strip 4. The reflector sheet includes a bottom reflector sheet 2 and a side reflector sheet 3, which are connected by a connection point 5. The bottom reflector sheet 2 is disposed on the light-incident side of the light guide plate 1, and the side reflector sheet 3 is bonded to the side of the light guide plate 1 by double-sided adhesive tape 6. The LED (Light Emitting Diode) strip 4 is disposed on the side of the light guide plate 1 where the side reflector sheet 3 is not bonded. Figure 1 This is an assembly diagram showing the side reflector not being attached to the side of the light guide plate. Figure 2 For along Figure 1 A schematic diagram of the cross-section in the CC' direction.

[0051] Because the materials used in automotive reflectors exhibit thermal shrinkage, their dimensions decrease significantly at high temperatures. High-temperature shrinkage rate tests were conducted on two commonly used reflector materials to obtain the following results: Figure 3 The graph shown. Figure 3 Figure a shows the thermal shrinkage rate of materials A and B in the MD direction (roll direction) over time at 95℃. Figure b shows the thermal shrinkage rate of materials A and B in the TD direction (non-roll direction) over time at 95℃. From figures a and b, it can be seen that the maximum shrinkage rate in the TD direction after high temperature is 0.28%, while the shrinkage rate in the MD direction (roll direction) is as high as 1.1%. In backlight modules with a large aspect ratio, the reflective sheet is often cut in the TD direction to reduce the shrinkage of the reflective sheet along the long side.

[0052] The light guide plate shrinks only slightly after reaching high temperatures, by more than 0.06%. This means that the shrinkage rates of the reflector and the light guide plate are inconsistent after high temperatures. This can lead to misalignment of the double-sided adhesive bonding points between the side reflector and the light guide plate, causing the side reflector to detach from the light guide plate. This increases the internal reflected light loss of the light guide plate, ultimately causing changes in backlight brightness and reducing display quality.

[0053] Based on this, embodiments of this application provide a backlight module, combined with Figure 4-8 As shown, it includes:

[0054] The light guide plate 1 includes a light emitting surface 101 and a backlight surface 102 arranged opposite to each other, and a side surface 100. The side surface 100 is connected to the light emitting surface 101 and the backlight surface 102 respectively. The side surface 100 includes a first sub-side surface 103 and a second sub-side surface 104 connected to each other.

[0055] Light-emitting unit 7 is disposed on the first sub-side 103 of light guide plate 1.

[0056] The reflection unit 8 includes a main reflection unit 9 and a side reflection unit 10. The main reflection unit 9 is disposed on the backlight surface 102 of the light guide plate 1, and the side reflection unit 10 is disposed on the second sub-side surface 104 of the light guide plate 1. The side reflection unit 10 includes at least a first side reflection sub-unit 11 and a plurality of connecting parts 12. The plurality of connecting parts 12 are connected to the main reflection unit 9. The first side reflection sub-unit 11 includes at least a plurality of first reflection parts 13. The first reflection part 13 is connected to at least one connecting part 12, and there is a first gap 14 between the part of the first reflection part that is not connected to the connecting part and the main reflection unit. A second gap 15 is provided between adjacent first reflection parts.

[0057] The shape of the light-emitting surface of the light guide plate is not limited. For example, the shape of the light-emitting surface of the light guide plate can be a quadrilateral, such as a rectangle or a square; or it can be a regular shape such as a triangle or a circle; of course, it can also be other irregular shapes. The specific shape of the light guide plate can be determined according to the shape of the display panel.

[0058] The specific structure of the light-emitting unit is not limited. For example, the light-emitting unit may include multiple light-emitting diodes arranged in an array.

[0059] The statement that the side-reflecting unit includes at least a first side-reflecting subunit and multiple connecting parts means that the side-reflecting unit only includes a first side-reflecting subunit and multiple connecting parts, in which case the side-reflecting unit is connected to the main reflecting unit. Alternatively, the side-reflecting unit includes a first side-reflecting subunit and multiple connecting parts, and may also include other structures, such as: Figure 9 The second side reflector subunit 17 shown is not connected to the main reflector unit. At this time, part of the side reflector unit is connected to the main reflector unit, and the rest is not connected to the main reflector unit.

[0060] The specific number of the first reflective parts included in the aforementioned side reflective unit can be determined according to the size of the light guide plate, and is not limited here.

[0061] In this application, the side-reflecting unit includes at least a first side-reflecting subunit and multiple connecting portions. The first side-reflecting subunit includes at least multiple first reflective portions, and a second gap is provided between adjacent first reflective portions. Compared with a side-reflecting sheet that is continuously arranged in one section, the first side-reflecting subunit of this application can reduce the stress generated during high-temperature shrinkage by providing multiple discontinuous first reflective portions, and at the same time reduce the difference in the size shrinkage between the whole and the light guide plate, thereby significantly reducing the risk of separation between the first side-reflecting subunit and the light guide plate, and thus ensuring the amount of reflected light in the light guide plate. When this light guide plate is applied in a display device, the display quality can be greatly improved.

[0062] In actual production, a reflective sheet including a main reflective unit pattern and a side reflective unit pattern can be formed first. Then, the reflective sheet is bent so that the first side reflective sub-unit in the side reflective unit is fixed to the second sub-side of the light guide plate. If the number of connecting parts is too small, breakage is likely during bending, affecting the fit between the first side reflective sub-unit and the second sub-side of the light guide plate; if the number of connecting parts is too large, bending is difficult. To balance these two factors, an optional method can be used, as shown in the reference... Figure 5 As shown, the first reflector 13 is connected to the main reflector unit ( ) via three connecting parts 12. Figure 5 (Not shown) are connected. The location and size of the three connecting parts are not specified here.

[0063] Further optionally, to further improve the connection stability between the first reflector and the main reflector unit, and to further facilitate bending, refer to Figure 5 As shown, the first reflective portion 13 is connected to a connecting portion 12 at both ends and the middle position. (Reference) Figure 7 As shown, in the first reflective part, the distance between the connecting part at the middle position and the connecting parts at both ends along the OA direction is w1. w1 can be 16mm, or other values, which can be determined according to the actual size of the light guide plate.

[0064] Further optionally, the two ends of the first reflective portion are respectively the first end ( Figure 5 The E terminal shown) and the second terminal ( Figure 5 The F end shown); of the two adjacent first reflectors, the second end of one of the first reflectors (shown) Figure 5 The connecting part connected to the F end shown, and the first end connected to the other first reflector ( Figure 5 As shown in the figure, the connection between the E-end and the connecting part is provided with such a Figure 5 and Figure 7 The third gap 16 shown corresponds to the position of the second gap.

[0065] The second and third gaps mentioned above are interconnected, allowing for more space to reduce the stress generated by the high-temperature contraction of the first reflective element, while also preventing adjacent first reflective elements from interfering with each other. Of course, reference... Figure 8 As shown, in two adjacent first reflective parts 13, the connecting part connected to the second end of one of the first reflective parts and the connecting part connected to the first end of the other first reflective part can be connected without any gap between them, which can improve the connection stability between the first reflective part and the main reflective unit.

[0066] In one or more embodiments, to simplify the structure and reduce manufacturing difficulty, combined with Figure 5 and Figure 6As shown, the first reflective portion 13 includes a first reflective layer 131 and a first adhesive layer 132. The first reflective layer 131 is connected to at least one connecting portion 12 and is fixed to the second sub-side surface 104 through the first adhesive layer 132; the first reflective layer and the connecting portion are integrally formed. In this way, they can be formed using the same process, and in this case, the materials of the first reflective layer and the connecting portion are the same.

[0067] In one or more embodiments, in order to ensure the consistency of the connection between each first reflective part and the main reflective unit and reduce the difference in the connection between each first reflective part and the main reflective unit, the dimensions of the multiple connecting parts are the same.

[0068] Optional, see reference Figure 7 As shown, the connecting part 12 is along the first preset direction ( Figure 7 The width w in the OA direction shown ranges from 0.5 to 3 mm. For example, the width of the connecting part along the first preset direction can be 0.5 mm, 1.0 mm, 2.0 mm, or 3 mm, etc. Here, the first preset direction refers to the arrangement direction of the first reflective part connected to the connecting part. (Refer to...) Figure 5 As shown, the arrangement direction of the first reflective part on the long side of the light guide plate is the OA direction. At this time, the width of the connecting part on the long side along the first preset direction is the same as the width of the connecting part on the long side along the OA direction. The arrangement direction of the first reflective part on the short side of the light guide plate is the OB direction. At this time, the width of the connecting part on the short side along the first preset direction is the same as the width of the connecting part on the long side along the OB direction.

[0069] The connecting part can be formed by die-cutting process; of course, it can also be formed by other processes, such as laser cutting process. In this case, the width of the connecting part along the first preset direction can be less than 0.5mm, such as 0.2mm or 0.3mm, etc.

[0070] In one or more embodiments, reference is made to Figure 7 As shown, adjacent first reflective portions 13 are positioned along a first preset direction ( Figure 7 The distance L (in the OA direction shown) ranges from 0.1 to 0.3 mm. For example, the distance between adjacent first reflective parts along the first preset direction can be 0.1 mm, 0.2 mm, or 0.3 mm, etc. Furthermore, the length of the first reflective part along the first preset direction is not limited and needs to be determined based on the size of the light guide plate. For example, the length of the first reflective part along the first preset direction can be 32 mm.

[0071] The following provides a specific structure of a light guide plate and a reflective unit. In one or more embodiments, the second sub-side includes a first portion disposed opposite to it. Figure 4 The left side shown) and the second part ( Figure 4The right side shown), and the third part ( Figure 4 The upper side shown) is connected to the first and second parts respectively, and the first sub-side is connected to the first and second parts respectively and is set opposite to the third part.

[0072] The side-reflecting unit includes a first side-reflecting subunit 11 and a plurality of connecting parts 12, with the first part, the second part and the third part respectively provided with the first side-reflecting subunit 11.

[0073] This structure is mainly used in small rectangular displays with an aspect ratio close to 1 and an 8-inch or smaller screen. The light guide plate has a first-side reflective sub-unit on each of its three sides, and a light-emitting unit on the remaining side, effectively solving the problem of the first-side reflective sub-unit separating from the light guide plate.

[0074] Optional, Part 1 ( Figure 5 The left side shown) along the first direction ( Figure 5 The length L2 of the OB direction shown and the third part ( Figure 5 The upper side shown) along the second direction ( Figure 5 The ratio of the lengths L1 in the OA direction shown is L, where 0.8 ≤ L ≤ 1, and the first direction intersects the second direction. Here, the first direction can be the direction of the short side of the light guide plate, and the second direction can be the direction of the long side of the light guide plate.

[0075] The following provides another specific structure of the light guide plate and reflective unit. In one or more embodiments, the second sub-side includes a first portion disposed opposite to it. Figure 4 The left side shown) and the second part ( Figure 4 The right side shown), and the third part ( Figure 4 The upper side shown) is connected to the first and second parts respectively, and the first sub-side is connected to the first and second parts respectively and is set opposite to the third part.

[0076] refer to Figure 9 As shown, the side-reflecting unit also includes a second side-reflecting subunit 17, which is not connected to the main reflective unit; the first part ( Figure 9 The left side shown) and the second part ( Figure 9 The right side shown is respectively provided with a second side reflector subunit 17, and the third part ( Figure 9 The upper side shown is provided with a first side reflector subunit 11.

[0077] This structure is mainly used in medium to large-sized rectangular displays with a relatively large aspect ratio. Due to the relatively large aspect ratio, in order to further improve optical consistency and avoid the problem of the reflective unit delamination caused by high temperature, a second side reflective sub-unit is set up separately. The second side reflective sub-unit is not connected to the main reflective unit.

[0078] Optional, for simplification of structure and ease of manufacture, refer to Figure 9 As shown, the second side reflective subunit 17 includes a reflective film 171 and an adhesive film 172. The reflective film is fixed to the second side of the subunit by the adhesive film. Here, the adhesive film can be double-sided tape, and the material of the reflective film can be the same as the material of the first reflective layer.

[0079] Optional, Part 1 ( Figure 9 The left side shown) along the first direction ( Figure 9 The length L2 of the OB direction shown and the third part ( Figure 9 The upper side shown) along the second direction ( Figure 9 The ratio of the lengths L1 in the OA direction shown is L, where 1 / 5 ≤ L ≤ 1 / 2, and the first direction intersects the second direction. Here, the first direction can be the direction of the short side of the light guide plate, and the second direction can be the direction of the long side of the light guide plate. In this structure, second-side reflective sub-units are set on the two short sides of the light guide plate, and a first-side reflective sub-unit and a light-emitting unit are set on one of the two long sides.

[0080] In related technologies, in order to better fix the light guide plate and the side reflector, reference is made. Figure 10 and Figure 11 As shown, the backlight module also includes a silicone pad 18. Under high temperature conditions, the light guide plate expands and causes the side reflectors to jointly squeeze the silicone pad, making it easier for the shrinkage states of the parts of the side reflectors that correspond to the silicone pad and those that do not to the silicone pad to be inconsistent. This further exacerbates the separation of the parts of the side reflectors that do not correspond to the silicone pad from the light guide plate, resulting in changes in backlight brightness.

[0081] To avoid this problem, this application provides a specific structure for a light guide plate and a reflective unit. In one or more embodiments, the second sub-side includes a first portion disposed opposite to it. Figure 12 The left side shown) and the second part ( Figure 12 The right side shown), and the third part ( Figure 12 The upper side shown) is connected to the first and second parts respectively, and the first sub-side is connected to the first and second parts respectively and is set opposite to the third part.

[0082] Part Three Figure 12The upper side shown is provided with a first side reflector subunit 11, and the first part and the second part are provided with either the first side reflector subunit or the second side reflector subunit; the first side reflector subunit provided on the third part is a fixed side reflector subunit.

[0083] refer to Figure 12 As shown, the fixed-side reflector subunit also includes a second reflector 20. The fixed-side reflector subunit is formed by multiple first reflectors. The fixed-side reflector is provided with second reflectors 20 at both ends, and the fixed-side reflector and the second reflector are not connected. The second reflector is connected to the main reflector unit.

[0084] refer to Figure 12 As shown, the backlight module also includes a fixing unit 19, which is disposed away from the third part of the second reflective portion 20. Figure 12 The upper side shown is located on one side, and the orthographic projection of the fixing unit in the third part is located within the orthographic projection of the second reflective part in the third part.

[0085] The third part mentioned above can be as follows: Figure 12 The side of the long side of the light guide plate shown can also be the side of the short side of the light guide plate; there is no limitation here. In order to provide sufficient backlight, the light-emitting unit is often placed on the side of the long side of the light guide plate. Therefore, the third part is usually the side of the long side of the light guide plate.

[0086] The first part and the second part described above are provided with either a first side reflective subunit or a second side reflective subunit, including the following situations: First, both the first part and the second part are provided with a first side reflective subunit. Second, [reference needed]. Figure 12 As shown, the first part ( Figure 12 The left side shown) and the second part ( Figure 12 The right side shown is provided with a second side reflective sub-unit 17. The third type has a first side reflective sub-unit in the first part and a second side reflective sub-unit in the second part. The fourth type has a second side reflective sub-unit in the first part and a first side reflective sub-unit in the second part.

[0087] The structure of the fixing unit described above is not limited; for example, the fixing unit may include a silicone pad. The fixing unit is configured to fix the light guide plate and the side reflection unit.

[0088] In the aforementioned fixed-side reflective subunit, the second reflective part is disconnected from the fixed-side reflective part. In this way, under high temperature conditions, when the light guide plate expands and causes the side reflective units to jointly squeeze the fixed unit, the stress generated by the squeezing of the second reflective part and the fixed unit will not affect the fixed-side reflective part, thereby greatly reducing the risk of separation between the fixed-side reflective part and the light guide plate, and thus ensuring the amount of reflected light in the light guide plate. When this light guide plate is applied to a display device, the display quality can be greatly improved.

[0089] It should be noted that, in order to further fix the light guide plate and the side reflection unit, the backlight module may also include a fixing unit disposed on the first part and the second part. Taking the fixing unit disposed on the first part as an example, if a first side reflection subunit is disposed on the first part, the first side reflection subunit includes a second reflective part and multiple first reflective parts. The multiple first reflective parts form a fixed side reflection part. The second reflective part is disposed at least at one end of the fixed side reflection part near the third part and is not connected to the fixed side reflection part. The second reflective part is connected to the main reflection unit. In this case, the fixing unit is disposed on the side of the second reflective part away from the first part. If a second side reflection subunit is disposed on the first part, the fixing unit is disposed at least at one end of the second side reflection subunit near the third part and away from the first part. The structure of the fixing unit disposed on the second part is the same as the structure of the fixing unit disposed on the first part, and will not be described again here.

[0090] Optional, see reference Figure 12 As shown, in the fixed-side reflective subunit, the two ends and the middle position of the first reflective part 13 are respectively connected to a connecting part 12; a groove 21 is provided between the fixed-side reflective subunit and the second reflective part 20.

[0091] Since no side-reflecting unit is located at the groove position, if the width of the groove along the second preset direction is too large, light leakage is likely to occur, thereby increasing the internal reflected light loss of the light guide plate and causing changes in backlight brightness. If the width of the groove along the second preset direction is too small, it is not conducive to separating the fixed side-reflecting sub-unit and the second reflective part, thus hindering the solution to the problem of delamination between the fixed side-reflecting sub-unit and the light guide plate. To balance both aspects, optional reference... Figure 13 As shown, the groove 21 is along the second preset direction ( Figure 13 The width w0 in the OA direction shown ranges from 0.1 to 1 mm. For example, this width can be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, or 1 mm. If the third part is the side of the long side of the light guide plate, then the second preset direction is as follows: Figure 13The direction of the long side of the light guide plate is shown; if the third part is the side of the short side of the light guide plate, then the second preset direction is the direction of the short side of the light guide plate. The above-mentioned groove can be formed by die-cutting process. Due to process limitations, the width of the groove along the preset direction is in the range of 0.5-1mm; of course, it can also be formed by other processes, such as laser cutting process. In this case, the width of the groove along the preset direction can be less than 0.5mm, such as 0.2mm or 0.3mm, etc.

[0092] Optionally, to facilitate manufacturing and maximize the area of ​​the side-reflecting units to increase the amount of internal reflected light from the light guide plate, refer to [reference needed]. Figure 13 As shown, the second reflective part 20 is in a direction perpendicular to the second preset direction ( Figure 13 The width H2 (in the OB direction shown) and the integral formed by the first reflective part and the connecting part are perpendicular to the second preset direction. Figure 13 The width H1 of the OB direction shown is the same.

[0093] Optional, see reference Figure 12 As shown, the second reflective part 20 includes a second reflective layer 201 and a second adhesive layer 202. The second reflective layer is fixed to the third part through the second adhesive layer. The main reflective unit includes a main reflective layer. The second reflective layer is connected to the main reflective layer. The main reflective layer, each second reflective layer, each first reflective layer and each connecting part are integrated into a single structure. This structure can simplify the manufacturing process and reduce production costs.

[0094] The main reflective layer, each second reflective layer, each first reflective layer, and each connecting part are made of the same material. In the actual manufacturing process, a reflective sheet including the pattern of the main reflective layer, each second reflective layer, each first reflective layer, and each connecting part can be formed first. Then, the reflective sheet is folded back along the connection between the connecting part and the main reflective layer, and the connection between the second reflective layer and the main reflective layer, so that each second reflective layer, each first reflective layer, and each connecting part are fixed to the second sub-side of the light guide plate.

[0095] The material of the second adhesive layer is not limited; for example, the second adhesive layer may include double-sided tape.

[0096] An embodiment of this application also provides a display screen, including: a display panel and the aforementioned backlight module, wherein the backlight module is disposed on the backlight side of the display panel.

[0097] The display panel can be of various types, including TN (Twisted Nematic), VA (Vertical Alignment), IPS (In-Plane Switching), and ADS (Advanced Super Dimension Switching) liquid crystal display panels. The display screen can be an LCD screen, as well as any product or component with display functionality, such as a television, digital camera, mobile phone, or tablet computer, that includes such a screen.

[0098] This application provides another rearview mirror, including the aforementioned display screen. This rearview mirror is used in vehicles, and its type is not limited; for example, the rearview mirror may be a streaming media rearview mirror. This rearview mirror has good optical consistency, strong high and low temperature reliability, and low cost.

[0099] An embodiment of this application provides a vehicle, including the aforementioned rearview mirror, which is disposed within the vehicle's interior space. The type of vehicle is not limited; it can be a new energy vehicle or a gasoline-powered vehicle.

[0100] The terms "an embodiment," "embodiment," or "one or more embodiments" as used herein mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Furthermore, please note that the examples of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0101] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A backlight module, wherein, include: A light guide plate, comprising a light-emitting surface and a backlight surface disposed opposite to each other, and a side surface, wherein the side surface is connected to the light-emitting surface and the backlight surface respectively; the side surface includes a first sub-side surface and a second sub-side surface connected together. A light-emitting unit is disposed on the first sub-side surface of the light guide plate; A reflective unit includes a main reflective unit and a side reflective unit. The main reflective unit is disposed on the back surface of the light guide plate, and the side reflective unit is disposed on the second sub-side surface of the light guide plate. The side reflective unit includes at least a first side reflective sub-unit and a plurality of connecting parts. The plurality of connecting parts are connected to the main reflective unit. The first side reflective sub-unit includes at least a plurality of first reflective parts. The first reflective parts are connected to at least one of the connecting parts, and there is a first gap between the portion of the first reflective part not connected to the connecting part and the main reflective unit. A second gap is provided between adjacent first reflective parts.

2. The backlight module according to claim 1, wherein, The first reflective part is connected to the main reflective unit through the three connecting parts.

3. The backlight module according to claim 2, wherein, The two ends and the middle position of the first reflective part are respectively connected to one of the connecting parts.

4. The backlight module according to claim 3, wherein, The two ends of the first reflective portion are a first end and a second end, respectively; In two adjacent first reflective portions, a third gap is provided between the connecting portion connected to the second end of one of the first reflective portions and the connecting portion connected to the first end of the other first reflective portion, and the position of the third gap corresponds to the position of the second gap.

5. The backlight module according to claim 1, wherein, The first reflective portion includes a first reflective layer and a first adhesive layer. The first reflective layer is connected to at least one of the connecting portions and is fixed to the second sub-side via the first adhesive layer. The first reflective layer and the connecting portion are integral structures.

6. The backlight module according to claim 1, wherein, The dimensions of the multiple connecting parts are the same.

7. The backlight module according to claim 6, wherein, The width of the connecting part along the first preset direction is in the range of 0.5-3mm.

8. The backlight module according to claim 1, wherein, The distance between adjacent first reflective parts along the first preset direction is in the range of 0.1-0.3 mm.

9. The backlight module according to any one of claims 1-8, wherein, The second sub-side includes a first part, a second part, and a third part disposed opposite to each other. The third part is connected to the first part and the second part respectively. The first sub-side is connected to the first part and the second part respectively and is disposed opposite to the third part. The side-reflecting unit includes a first side-reflecting subunit and a plurality of connecting portions, wherein the first portion, the second portion and the third portion are respectively provided with the first side-reflecting subunit.

10. The backlight module according to claim 9, wherein, The ratio of the length of the first part along the first direction to the length of the third part along the second direction is L, where 0.8 ≤ L ≤ 1, and the first direction intersects the second direction.

11. The backlight module according to any one of claims 1-8, wherein, The second sub-side includes a first part, a second part, and a third part disposed opposite to each other. The third part is connected to the first part and the second part respectively. The first sub-side is connected to the first part and the second part respectively and is disposed opposite to the third part. The side reflection unit further includes a second side reflection subunit, which is not connected to the main reflection unit; the first part and the second part are respectively provided with the second side reflection subunit, and the third part is provided with the first side reflection subunit.

12. The backlight module according to claim 11, wherein, The second side reflective subunit includes a reflective film and an adhesive film, wherein the reflective film is fixed to the second side surface via the adhesive film.

13. The backlight module according to claim 11, wherein, The ratio of the length of the first part along the first direction to the length of the third part along the second direction is L, where 1 / 5 ≤ L ≤ 1 / 2, and the first direction intersects the second direction.

14. The backlight module according to any one of claims 1-8, wherein, The second sub-side includes a first part, a second part, and a third part disposed opposite to each other. The third part is connected to the first part and the second part respectively. The first sub-side is connected to the first part and the second part respectively and is disposed opposite to the third part. The third part is provided with the first side reflective subunit, and the first part and the second part are provided with either the first side reflective subunit or the second side reflective subunit; The first side-reflecting subunit disposed on the third part is a fixed side-reflecting subunit; The fixed-side reflective subunit further includes a second reflective portion. The fixed-side reflective subunit is formed by a plurality of first reflective portions. The fixed-side reflective portion has second reflective portions at both ends, and the fixed-side reflective portion is not connected to the second reflective portion. The second reflective portion is connected to the main reflective unit. The backlight module further includes a fixing unit, which is disposed on the side of the second reflective part away from the third part, and the orthographic projection of the fixing unit on the third part is located within the orthographic projection of the second reflective part on the third part.

15. The backlight module according to claim 14, wherein, In the fixed-side reflective subunit, the two ends and the middle position of the first reflective part are respectively connected to one of the connecting parts; A groove is provided between the fixed-side reflector subunit and the second reflector.

16. The backlight module according to claim 14, wherein, The width of the second reflective portion in the direction perpendicular to the second preset direction is the same as the width of the whole formed by the first reflective portion and the connecting portion in the direction perpendicular to the second preset direction.

17. The backlight module according to claim 14, wherein, The second reflective portion includes a second reflective layer and a second adhesive layer, the second reflective layer being fixed to the third portion via the second adhesive layer; the main reflective unit includes a main reflective layer; the second reflective layer is connected to the main reflective layer; The main reflective layer, each of the second reflective layers, each of the first reflective layers, and each of the connecting portions are an integral structure.

18. A display screen, wherein, include: The display panel and the backlight module according to any one of claims 1-17, wherein the backlight module is disposed on the backlight side of the display panel.

19. A rearview mirror, wherein, include: The display screen as claimed in claim 18.

20. A vehicle, wherein, include: The rearview mirror of claim 19, wherein the rearview mirror is disposed in the interior space of the vehicle.

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