Backlight module and display module

Abstract

The utility model provides a backlight module which comprises a back plate, a reflecting layer and a first bonding part, and the back plate forms a cavity with an opening at one end; the reflecting layer is located in the cavity, the reflecting layer comprises a bottom reflecting sheet and at least one first side reflecting sheet, the bottom reflecting sheet is opposite to the bottom wall of the cavity, and the first side reflecting sheet is opposite to one side wall of the cavity; the bottom reflector plate and the first side reflector plate are connected into a whole, and the first bonding part is located on the side, away from the cavity side wall, of the first side reflector plate and is connected with the first side reflector plate in a bonding mode. A plurality of notches are formed in the edge of the end, close to the connecting line of the bottom reflector plate and the first side reflector plate, of the first bonding part and distributed at intervals. The backlight module can effectively improve or avoid poor display area white spots caused by flowing excessive glue after the first bonding part swells, the display quality of the display module is improved, and the mass production feasibility of the backlight module and the display module is ensured.

Description

Technical Field

[0001] The utility model belongs to the display field, and specifically relates to a backlight module and a display module. Background Art

[0002] Liquid Crystal Display (LCD) is currently widely favored due to its low power consumption, small size, low radiation, low cost and long life. Utility Model Content

[0003] The utility model provides a backlight module and a display module.

[0004] The utility model provides a backlight module, comprising a back plate, a reflective layer and a first bonding portion.

[0005] The back plate is formed as a cavity with one end open;

[0006] The reflective layer is located in the cavity, and the reflective layer includes a bottom reflective sheet and at least one first side reflective sheet, the bottom reflective sheet is opposite to the bottom wall of the cavity, and the first side reflective sheet is opposite to one side wall of the cavity;

[0007] The bottom reflective sheet and the first side reflective sheet are connected as one body,

[0008] The first bonding portion is located on a side of the first side reflection sheet away from the side wall of the cavity, and is bonded to the first side reflection sheet;

[0009] A plurality of notches are formed at an edge of one end of the first bonding portion close to a connection line between the bottom reflector and the first side reflector, and the plurality of notches are distributed at intervals.

[0010] In some embodiments, the connection line between the bottom reflector and the first side reflector includes a plurality of solid parts and a plurality of hollow parts, and the solid parts and the hollow parts are arranged alternately;

[0011] The plurality of notches are arranged in one-to-one correspondence with the plurality of solid parts, and the openings of the notches face the solid parts.

[0012] In some embodiments, the opening width of the notch along the extending direction of the connection line is greater than or equal to the width of the solid portion along the extending direction of the connection line.

[0013] In some embodiments, the depth of the notch in a direction away from the connection line is less than or equal to the width of the first bonding portion in a direction away from the connection line;

[0014] A width of the first bonding portion along a direction away from the connection line is smaller than or equal to a width of the first side reflection sheet along the direction away from the connection line.

[0015] In some embodiments, the orthographic projection shape of the notch on the first side reflector sheet includes a circular arc, an elliptical arc, a semicircle, or a rectangle.

[0016] In some embodiments, the radius of the semicircular notch ranges from 1.0 to 2.0 mm.

[0017] In some embodiments, the plurality of solid portions are arranged at equal intervals along the extending direction of the connecting line.

[0018] The width ratio of the hollow portion to the solid portion along the extension direction of the connecting line is in a range of 10:1 to 20:1.

[0019] In some embodiments, the invention further includes a light guide plate, a light bar, a second bonding portion and a third bonding portion.

[0020] The light guide plate is located on a side of the bottom reflector away from the bottom wall of the cavity.

[0021] The first side reflective sheet is arranged opposite to the first side edge end surface of the light guide plate.

[0022] The first bonding portion is located between the first side reflection sheet and the first side edge end surface, and the first bonding portion is bonded and connected to the first side reflection sheet and the first side edge end surface respectively;

[0023] The light bar is located between the fourth side edge end surface of the light guide plate and the side wall of the cavity on the opposite side thereof;

[0024] The reflective layer further includes a second side reflective sheet and a third side reflective sheet, wherein the second side reflective sheet and the third side reflective sheet are respectively opposite to different side walls of the cavity, and the second side reflective sheet and the third side reflective sheet are not connected to the bottom reflective sheet;

[0025] The second side reflective sheet is disposed opposite to the second side edge end surface of the light guide plate, and the third side reflective sheet is disposed opposite to the third side edge end surface of the light guide plate.

[0026] The first side edge end surface is opposite to the third side edge end surface, and the second side edge end surface is opposite to the fourth side edge end surface;

[0027] The second bonding portion is located between the second side reflection sheet and the second side edge end surface, and the second bonding portion is bonded and connected to the second side reflection sheet and the second side edge end surface respectively;

[0028] The third bonding portion is located between the third side reflection sheet and the third side edge end surface, and the third bonding portion is bonded and connected to the third side reflection sheet and the third side edge end surface respectively.

[0029] In some embodiments, the orthographic projection of the first bonding portion on the first side reflective sheet is located in the orthographic projection area of ​​the light guide plate on the first side reflective sheet;

[0030] The orthographic projection of the second bonding portion on the second side reflective sheet is located in the orthographic projection area of ​​the light guide plate on the second side reflective sheet;

[0031] The orthographic projection of the third bonding portion on the third side reflection sheet is located within the orthographic projection area of ​​the light guide plate on the third side reflection sheet.

[0032] In some embodiments, a fourth bonding portion is further included, located between the cavity bottom wall and the bottom reflector, and the fourth bonding portion is bonded and connected to the cavity bottom wall and the bottom reflector respectively;

[0033] A distance between the fourth bonding portion and the first side reflection sheet is smaller than a distance between the fourth bonding portion and the third side reflection sheet.

[0034] In some embodiments, a distance between the fourth bonding portion and a surface of the first side reflective sheet facing away from the light guide plate is in a range of 1 to 5 mm.

[0035] In some embodiments, the fourth bonding portion is in the shape of a strip.

[0036] The angle between the length direction of the fourth bonding portion and the extension direction of the connecting line is greater than or equal to 0° and less than 90°,

[0037] The width of the fourth bonding portion ranges from 2 to 5 mm;

[0038] The thickness of the fourth bonding portion is in the range of 0.03 to 0.05 mm.

[0039] In some embodiments, the first bonding portion, the second bonding portion, the third bonding portion, and the fourth bonding portion include double-sided adhesive or transparent optical adhesive.

[0040] In some embodiments, an optical film layer and a middle frame are also included.

[0041] The optical film layer is located on a side of the light guide plate away from the bottom reflector, and the orthographic projection of the optical film layer on the bottom wall of the cavity at least covers the orthographic projection of the light guide plate on the bottom wall of the cavity;

[0042] The middle frame includes a first part and a second part, wherein the first part and the second part are connected as a whole;

[0043] The first portion is disposed around the side wall of the cavity, the second portion is located on a side of the optical film layer away from the light guide plate, and the second portion overlaps with an orthographic projection of an edge of the optical film layer on the bottom wall of the cavity.

[0044] The embodiment of the utility model further provides a display module, comprising the above-mentioned backlight module.

[0045] Beneficial effects of the present invention: The backlight module provided by the present invention can increase or block the flow path of the first bonding portion after swelling by providing a plurality of spaced-apart notches at the edge of one end of the first bonding portion close to the connection line between the bottom reflector and the first side reflector, thereby increasing or blocking the flow path of the first bonding portion after swelling into the display area of ​​the display module using the backlight module, thereby effectively improving or avoiding white spots in the display area caused by overflow of glue after swelling of the first bonding portion, improving the display quality of the display module using the backlight module, and ensuring the feasibility of mass production of the backlight module and the display module.

[0046] The display module provided by the utility model can effectively improve or avoid the white spot defect in the display area of ​​the display module by adopting the above-mentioned backlight module, thereby improving the display quality of the display module and ensuring the feasibility of mass production of the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1a A schematic diagram of a white spot defect on the upper side of a vehicle instrument panel in the related art;

[0048] Figure 1b A schematic diagram of a vehicle instrument panel in the related art showing a white spot defect over time;

[0049] Figure 1c A schematic diagram of disassembly and analysis of a vehicle instrument panel with white spots in the related art;

[0050] Figure 1d It is a flattened top view schematic diagram of a reflective sheet in a backlight module in the related art;

[0051] Figure 2a This is a schematic cross-sectional view of the structure of a backlight module in an embodiment of the utility model;

[0052] Figure 2b This is a flattened top view schematic diagram of a reflective layer in a backlight module according to an embodiment of the utility model;

[0053] Figure 2c This is a flattened top view schematic diagram of the bottom reflector and the first side reflector in the backlight module of the embodiment of the utility model;

[0054] Figure 2d for Figure 2c A magnified schematic diagram of part A;

[0055] Figure 3a Another flattened top view schematic diagram of the bottom reflector and the first side reflector in the backlight module of the embodiment of the utility model;

[0056] Figure 3b for Figure 3a A magnified schematic diagram of part B;

[0057] Figure 4 It is a schematic cross-sectional view of the structure of a display module in an embodiment of the utility model. DETAILED DESCRIPTION

[0058] In order to enable those skilled in the art to better understand the technical solution of the present invention, a backlight module and a display module of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0059] In the related technology, end consumers complained that white spots appeared on the upper and left edges of the car dashboard, affecting the display effect. The actual bad photos are as follows: Figure 1a As shown. Figure 1b As shown in the figure, in a short period of time, customers have reported that the number of defective products with white spots has reached several pieces, and the number of defective products is still increasing. Among them, the above-mentioned white spots are mainly found in vehicles with an average mileage of more than 40,000 kilometers, and are mainly found in the hot summer. Figure 1b The numbers arranged vertically on the left represent the failure index (referring to the appearance of white spots on the vehicle instrument). The failure index is a percentage, specifically referring to the proportion of the number of failures in a certain month to the total number of failures in a period of time. The numbers arranged vertically on the right represent the cumulative mileage of the vehicle when the failure occurs, in units of 10,000 kilometers.

[0060] like Figure 1c As shown, after disassembly, it was found that the white spots were sticky foreign matter, located on the upper surface (light emitting side surface) and lower surface (surface opposite to the light emitting side surface) of the light guide plate in the backlight module of the vehicle instrument panel (i.e., the vehicle display screen). Through instrument analysis, it was determined that the sticky foreign matter came from the double-sided glue pasted between the side reflector and the edge end face of the light guide plate in the backlight module of the vehicle instrument panel, and the double-sided glue was acrylic.

[0061] In related technologies, such as Figure 1dAs shown, the backlight module of the vehicle instrument panel includes a back plate, a light bar 5, a light guide plate, a bottom reflector 20, an upper reflector 24, a left reflector 25 and a right reflector 26. The light guide plate is located on one side of the back plate; the light bar 5 is located on the lower edge end face of the light guide plate; the bottom reflector 20 is located between the back plate and the light guide plate; the upper reflector 24 is located on the upper edge end face of the light guide plate and is arranged opposite thereto; the left reflector 25 is located on the left edge end face of the light guide plate and is arranged opposite thereto; the right reflector 26 is located on the right edge end face of the light guide plate and is arranged opposite thereto. The left reflector 25 and the upper reflector 24 are connected to the bottom reflector 20 as a whole, and the left reflector 25 and the upper reflector 24 are bent relative to the bottom reflector 20 and attached to the corresponding side edge end faces of the light guide plate through a double-sided adhesive 27. The right reflector 26 is attached to the right edge end face of the light guide plate separately through a double-sided adhesive.

[0062] Through analysis, it can be known that the white spots on the upper and left edges of the above-mentioned vehicle instrument panel are caused by the fact that products such as fragrances or interior cleaning agents or air purifiers containing palmitic acid in the car enter the interior of the vehicle instrument panel through various means, and the high temperature causes the acrylic acid and palmitic acid in the double-sided colloid to swell and flow, and finally enter the display area of ​​the vehicle instrument panel, resulting in white spots. Vehicle instrument panels are generally tilted or placed vertically, that is, the upper edge of the vehicle instrument panel is at the highest position. Due to the effect of gravity, the white spots on the upper edge of the vehicle instrument panel are more serious.

[0063] In summary, the operating conditions of vehicle dashboards are complex, and conventional designs cannot fully cover various in-vehicle usage environments. It is necessary to further analyze the causes of white spots and optimize conventional design solutions.

[0064] In addition, the use conditions of the vehicle instrument panel in the related technology are complex, and there is a risk of shaking and abnormal noise after long-term use.

[0065] In order to solve the problems existing in the vehicle instrument panel in the related art, the embodiment of the utility model provides a backlight module, such as Figure 2a , Figure 2b , Figure 2c and Figure 2d As shown, it includes a backplane 1, a reflective layer 2 and a first bonding portion 3, the backplane 1 is formed into a cavity with an opening at one end; the reflective layer 2 is located in the cavity, the reflective layer 2 includes a bottom reflective sheet 20 and at least one first side reflective sheet 21, the bottom reflective sheet 20 is opposite to the bottom wall 10 of the cavity, and the first side reflective sheet 21 is opposite to the side wall 11 of the cavity; the bottom reflective sheet 20 and the first side reflective sheet 21 are connected as a whole, the first bonding portion 3 is located on the side of the first side reflective sheet 21 away from the side wall 11 of the cavity, and is bonded to the first side reflective sheet 21; a plurality of notches 30 are provided on the edge of one end of the first bonding portion 3 close to the connection line P between the bottom reflective sheet 20 and the first side reflective sheet 21, and the plurality of notches 30 are distributed at intervals.

[0066] The first bonding part 3 comprises double-sided adhesive or transparent optical adhesive. The material of the first bonding part 3 comprises acrylic acid, and acrylic acid and palmitic acid are easy to swell and flow under high temperature. The display area of ​​the display module using the backlight module is located in the area corresponding to the bottom reflector 20.

[0067] In the present embodiment, a plurality of spaced-apart notches 30 are provided at the edge of one end of the first adhesive portion 3 close to the connection line P between the bottom reflector 20 and the first side reflector 21, so that the flow path of the first adhesive portion 3 after swelling can be increased or blocked, thereby increasing or blocking the flow path of the first adhesive portion 3 after swelling into the display area of ​​the display module using the backlight module, thereby effectively improving or avoiding white spots in the display area caused by overflow of glue after swelling of the first adhesive portion 3, improving the display quality of the display module using the backlight module, and ensuring the feasibility of mass production of the backlight module and the display module.

[0068] In some embodiments, Figure 2c and Figure 2d As shown, the connection line P between the bottom reflector 20 and the first side reflector 21 includes multiple solid parts P0 and multiple hollow parts P1, and the solid parts P0 and the hollow parts P1 are arranged alternately; multiple notches 30 are arranged one by one corresponding to the multiple solid parts P0, and the openings of the notches 30 face the solid parts P0.

[0069] The hollow portion P1 refers to the hollowed-out area on the connecting line P between the bottom reflector 20 and the first side reflector 21; the solid portion P0 refers to the solid area (i.e., the non-hollowed-out area) on the connecting line P between the bottom reflector 20 and the first side reflector 21. When the first bonding portion 3 swells and flows, it can only flow to the display area through the solid portion P0 first. By making the notch 30 of the first bonding portion 3 correspond to the position of the solid portion P0, and the opening of the notch 30 faces the solid portion P0, the path for the swollen first bonding portion 3 to flow to the display area through the notch 30 and the solid portion P0 can be increased, or the notch 30 can block the flow path of the swollen first bonding portion 3, thereby effectively improving or avoiding the white spot defect in the display area caused by the overflow of the first bonding portion 3 after swelling.

[0070] In some embodiments, the opening width a of the notch 30 along the extending direction of the connection line P is greater than or equal to the width b of the solid portion P0 along the extending direction of the connection line P.

[0071] Among them, when the opening width a of the notch 30 along the extension direction of the connecting line P is greater than the width b of the solid part P0 along the extension direction of the connecting line P, the path for the swollen first adhesive part 3 to flow to the display area through the notch 30 and the solid part P0 can be further increased, or the notch 30 can further block the flow path of the swollen first adhesive part 3, thereby effectively improving or avoiding white spots in the display area caused by overflow of the glue after the first adhesive part 3 swells.

[0072] In some embodiments, Figure 2c , Figure 2d , Figure 3a and Figure 3b As shown, the depth h of the notch 30 along the direction away from the connecting line P is less than or equal to the width h1 of the first bonding portion 3 along the direction away from the connecting line P; the width h1 of the first bonding portion 3 along the direction away from the connecting line P is less than or equal to the width h2 of the first side reflector 21 along the direction away from the connecting line P.

[0073] Among them, Figure 3a and Figure 3b As shown, when the depth h of the notch 30 along the direction away from the connection line P is equal to the width h1 of the first bonding portion 3 along the direction away from the connection line P, the first bonding portion 3 is completely disconnected at the position of the notch 30, which can further increase the path for the swollen first bonding portion 3 to flow to the display area through the notch 30 and the solid portion P0, or the notch 30 can further block the flow path of the swollen first bonding portion 3, thereby effectively improving or avoiding white spots in the display area caused by overflow of the first bonding portion 3 after swelling.

[0074] In some embodiments, Figure 2d and Figure 3b As shown, the orthographic projection shape of the notch 30 on the first side reflector 21 includes a circular arc, an elliptical arc, a semicircle or a rectangle. The notch 30 may also be in other shapes, which are not limited here.

[0075] In some embodiments, the radius of the semicircular notch 30 ranges from 1.0 to 2.0 mm.

[0076] In this embodiment, the shape and size of the notch 30 need to take into account the firmness of the first side reflector 21, the path length of the swelling and flow of the first adhesive portion 3 (i.e., the overflow depth), the width h2 of the first side reflector 21 in the direction away from the connection line P, and the feasibility of the process. In this embodiment, the notch 30 is a semicircular notch with a radius size range of 1.0 mm to 2.0 mm. The upper limit of the radius (e.g., 2.0 mm) is mainly limited by the width h2 of the first side reflector 21 in the direction away from the connection line P. The width h2 of the first side reflector 21 in the direction away from the connection line P is generally 2.0 mm.

[0077] In some embodiments, the thickness of the bottom reflector 20 is in the range of 0.188 mm to 0.225 mm, and the first side reflector 21 can be located at any side edge around the bottom reflector 20. The thickness of the first bonding portion 3 is in the range of 0.03 mm to 0.05 mm.

[0078] In some embodiments, a plurality of solid portions P0 are arranged at equal intervals along the extension direction of the connection line P, and the width ratio of the hollow portion P1 to the solid portion P0 along the extension direction of the connection line P is in the range of 10:1 to 20:1. The connection line P is arranged in this way, so that the first side reflection sheet 21 can be bent relative to the bottom reflection sheet 20 more conveniently and simply, thereby simplifying the manufacturing process.

[0079] In some embodiments, Figure 2a and Figure 2b As shown, the backlight module also includes a light guide plate 4, a light bar 5, a second bonding portion 6 and a third bonding portion 7. The light guide plate 4 is located on the side of the bottom reflector 20 away from the bottom wall 10 of the cavity. The first side reflector 21 is arranged opposite to the first side edge end face of the light guide plate 4. The first bonding portion 3 is located between the first side reflector 21 and the first side edge end face m1, and the first bonding portion 3 is bonded and connected to the first side reflector 21 and the first side edge end face m1 respectively; the light bar 5 is located between the fourth side edge end face m4 of the light guide plate 4 and the cavity side wall 11 opposite thereto; the reflective layer 2 also includes a second side reflector 22 and a third side reflector 23. The second side reflector 22 and the third side reflector 23 are respectively opposite to different side walls 11 of the cavity. The second side reflector 22 and the third side reflector 23 are not connected to the bottom reflector 20; the second side reflector 22 is arranged opposite to the second side edge end face m2 of the light guide plate 4, the third side reflector 23 is arranged opposite to the third side edge end face m3 of the light guide plate 4, the first side edge end face m1 is opposite to the third side edge end face m3, and the second side edge end face m2 is opposite to the fourth side edge end face m4; the second bonding portion 6 is located between the second side reflector 22 and the second side edge end face m2, and the second bonding portion 6 is bonded to the second side reflector 22 and the second side edge end face m2 respectively; the third bonding portion 7 is located between the third side reflector 23 and the third side edge end face m3, and the third bonding portion 7 is bonded to the third side reflector 23 and the third side edge end face m3 respectively.

[0080] Among them, by connecting the first side reflector 21 and the bottom reflector 20 as a whole, and the second side reflector 22 and the third side reflector 23 are not connected to the bottom reflector 20, the difficulty of the preparation process of the reflective layer 2 can be reduced, thereby simplifying the preparation process of the backlight module.

[0081] In some embodiments, the orthographic projection of the first bonding portion 3 on the first side reflection sheet 21 is located within the orthographic projection area of ​​the light guide plate 4 on the first side reflection sheet 21; the orthographic projection of the second bonding portion 6 on the second side reflection sheet 22 is located within the orthographic projection area of ​​the light guide plate 4 on the second side reflection sheet 22; and the orthographic projection of the third bonding portion 7 on the third side reflection sheet 23 is located within the orthographic projection area of ​​the light guide plate 4 on the third side reflection sheet 23. Such an arrangement ensures that the first bonding portion 3 firmly bonds the first side reflection sheet 21 and the first side edge end surface m1 of the light guide plate 4 together, the second bonding portion 6 firmly bonds the second side reflection sheet 22 and the second side edge end surface m2 of the light guide plate 4 together, and the third bonding portion 7 firmly bonds the third side reflection sheet 23 and the third side edge end surface m3 of the light guide plate 4 together, thereby ensuring the connection firmness and stability between the various components of the backlight module.

[0082] In some embodiments, Figure 2a As shown, the backlight module also includes a fourth bonding portion 8, which is located between the cavity bottom wall 10 and the bottom reflector 20, and the fourth bonding portion 8 is bonded to the cavity bottom wall 10 and the bottom reflector 20 respectively; the distance between the fourth bonding portion 8 and the first side reflector 21 is smaller than the distance between the fourth bonding portion 8 and the third side reflector 23.

[0083] Among them, the fourth bonding part 8 can, on the one hand, fix the back plate 1 and the reflective layer 2 together to prevent the relative shaking between the two; on the other hand, since the first side reflective sheet 21 and the bottom reflective sheet 20 are connected as a whole, and the first side reflective sheet 21 and the light guide plate 4 are bonded together through the first bonding part 3, the fourth bonding part 8 finally bonds the light guide plate 4, the reflective layer 2 and the back plate 1 to form an integral fixed structure, which can prevent the backlight module from shaking and making abnormal noise after the normal temperature and high temperature reliability tests, and ensure the firmness and stability of the overall structure of the backlight module. In addition, the fourth bonding part 8 is arranged close to the first side reflective sheet 21, and since the first side reflective sheet 21 and the bottom reflective sheet 20 are connected as a whole, the firmness and stability of the fixing of each component in the backlight module can be further enhanced.

[0084] In some embodiments, a distance s between the fourth bonding portion 8 and a surface of the first side reflection sheet 21 facing away from the light guide plate 4 is in a range of 1 to 5 mm.

[0085] In some embodiments, the fourth bonding portion 8 is strip-shaped, the angle between the length direction of the fourth bonding portion 8 and the extension direction of the connecting line P is greater than or equal to 0° and less than 90°, the width s1 of the fourth bonding portion 8 ranges from 2 to 5 mm; the thickness of the fourth bonding portion 8 ranges from 0.03 to 0.05 mm.

[0086] In some embodiments, the length direction of the fourth adhesive portion 8 is parallel to the extension direction of the connection line P, and the length of the fourth adhesive portion 8 is equal to the length of the connection line P. This arrangement can facilitate the assembly and attachment of the fourth adhesive portion 8 .

[0087] In some embodiments, the second adhesive part 6, the third adhesive part 7 and the fourth adhesive part 8 include double-sided adhesive or transparent optical adhesive. In this embodiment, since the second adhesive part 6 and the third adhesive part 7 are used to attach the independently arranged second side reflector 22 and the third side reflector 23 to the corresponding side edge end surfaces of the light guide plate 4, respectively, the second adhesive part 6 and the third adhesive part 7 will not flow to the display area after swelling, so there is no need to open a notch on the second adhesive part 6 and the third adhesive part 7.

[0088] In some embodiments, Figure 2a As shown, the backlight module also includes an optical film layer 9 and a middle frame 12, the optical film layer 9 is located on the side of the light guide plate 4 away from the bottom reflector 20, and the orthographic projection of the optical film layer 9 on the bottom wall 10 of the cavity at least covers the orthographic projection of the light guide plate 4 on the bottom wall 10 of the cavity; the middle frame 12 includes a first part 121 and a second part 122, and the first part 121 and the second part 122 are connected as a whole; the first part 121 is arranged around the outer periphery of the side wall 11 of the cavity, and the second part 122 is located on the side of the optical film layer 9 away from the light guide plate 4, and the second part 122 overlaps with the orthographic projection of the edge of the optical film layer 9 on the bottom wall 10 of the cavity.

[0089] The backlight module provided in the present embodiment can increase or block the flow path of the first adhesive portion after swelling by providing a plurality of spaced-apart notches at the edge of one end of the first adhesive portion close to the connection line between the bottom reflector and the first side reflector, thereby increasing or blocking the flow path of the first adhesive portion after swelling into the display area of ​​the display module using the backlight module, thereby effectively improving or avoiding white spots in the display area caused by overflow of the adhesive after swelling of the first adhesive portion, improving the display quality of the display module using the backlight module, and ensuring the feasibility of mass production of the backlight module and the display module.

[0090] The present utility model also provides a display module, such as Figure 4 As shown, it includes the backlight module 13 in the above embodiment.

[0091] In some embodiments, the display module further includes a display screen 14 , which is located on a side of the second portion 122 of the backlight module 13 away from the optical film layer 9 , and the orthographic projection of the display screen 14 on the backlight module 13 at least covers the light guide plate 4 in the backlight module 13 .

[0092] In some embodiments, the display screen 14 may be a liquid crystal display screen, ie, LCD.

[0093] The display module provided in this embodiment can effectively improve or avoid the white spot defect in the display area of ​​the display module by adopting the backlight module in the above embodiment, thereby improving the display quality of the display module and ensuring the feasibility of mass production of the display module.

[0094] The display module can be any product or component with display function, such as LCD panel, LCD TV, electronic paper, mobile phone, tablet computer, notebook computer, display, notebook computer, digital photo frame, navigator, etc.

[0095] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A backlight module, comprising a back plate, a reflective layer and a first bonding portion, The back plate is formed as a cavity with one end open; The reflective layer is located in the cavity, and the reflective layer includes a bottom reflective sheet and at least one first side reflective sheet, the bottom reflective sheet is opposite to the bottom wall of the cavity, and the first side reflective sheet is opposite to one side wall of the cavity; The bottom reflective sheet and the first side reflective sheet are connected as one body, The first bonding portion is located on a side of the first side reflection sheet away from the side wall of the cavity, and is bonded to the first side reflection sheet; It is characterized in that A plurality of notches are formed at an edge of one end of the first bonding portion close to a connection line between the bottom reflector and the first side reflector, and the plurality of notches are distributed at intervals.

2. The backlight module according to claim 1, characterized in that: The connection line between the bottom reflector and the first side reflector comprises a plurality of solid parts and a plurality of hollow parts, and the solid parts and the hollow parts are arranged alternately; The plurality of notches are arranged in one-to-one correspondence with the plurality of solid parts, and the openings of the notches face the solid parts.

3. The backlight module according to claim 2, characterized in that: The opening width of the notch along the extending direction of the connection line is greater than or equal to the width of the solid portion along the extending direction of the connection line.

4. The backlight module according to claim 3, characterized in that: The depth of the notch in the direction away from the connection line is less than or equal to the width of the first bonding portion in the direction away from the connection line; A width of the first bonding portion along a direction away from the connection line is smaller than or equal to a width of the first side reflection sheet along the direction away from the connection line.

5. The backlight module according to any one of claims 1 to 4, characterized in that: The orthographic projection shape of the notch on the first side reflector sheet includes a circular arc, an elliptical arc, a semicircle or a rectangle.

6. The backlight module according to claim 5, characterized in that: The radius of the semicircular notch ranges from 1.0 to 2.0 mm.

7. The backlight module according to claim 2, characterized in that: The plurality of solid parts are arranged at equal intervals along the extending direction of the connecting line, The width ratio of the hollow portion to the solid portion along the extension direction of the connecting line is in a range of 10:1 to 20:

1.

8. The backlight module according to any one of claims 1 to 4, characterized in that: It also includes a light guide plate, a light bar, a second bonding portion and a third bonding portion, The light guide plate is located on a side of the bottom reflector away from the bottom wall of the cavity. The first side reflective sheet is arranged opposite to the first side edge end surface of the light guide plate. The first bonding portion is located between the first side reflection sheet and the first side edge end surface, and the first bonding portion is bonded and connected to the first side reflection sheet and the first side edge end surface respectively; The light bar is located between the fourth side edge end surface of the light guide plate and the side wall of the cavity on the opposite side thereof; The reflective layer further includes a second side reflective sheet and a third side reflective sheet, wherein the second side reflective sheet and the third side reflective sheet are respectively opposite to different side walls of the cavity, and the second side reflective sheet and the third side reflective sheet are not connected to the bottom reflective sheet; The second side reflective sheet is disposed opposite to the second side edge end surface of the light guide plate, and the third side reflective sheet is disposed opposite to the third side edge end surface of the light guide plate. The first side edge end surface is opposite to the third side edge end surface, and the second side edge end surface is opposite to the fourth side edge end surface; The second bonding portion is located between the second side reflection sheet and the second side edge end surface, and the second bonding portion is bonded and connected to the second side reflection sheet and the second side edge end surface respectively; The third bonding portion is located between the third side reflection sheet and the third side edge end surface, and the third bonding portion is bonded and connected to the third side reflection sheet and the third side edge end surface respectively.

9. The backlight module according to claim 8, characterized in that: The orthographic projection of the first bonding portion on the first side reflection sheet is located in the orthographic projection area of ​​the light guide plate on the first side reflection sheet; The orthographic projection of the second bonding portion on the second side reflective sheet is located in the orthographic projection area of ​​the light guide plate on the second side reflective sheet; The orthographic projection of the third bonding portion on the third side reflection sheet is located within the orthographic projection area of ​​the light guide plate on the third side reflection sheet.

10. The backlight module according to claim 8, characterized in that: It also includes a fourth bonding portion, which is located between the bottom wall of the cavity and the bottom reflection sheet, and the fourth bonding portion is bonded and connected to the bottom wall of the cavity and the bottom reflection sheet respectively; A distance between the fourth bonding portion and the first side reflection sheet is smaller than a distance between the fourth bonding portion and the third side reflection sheet.

11. The backlight module according to claim 10, characterized in that: The distance between the fourth bonding portion and a surface of the first side reflection sheet facing away from the light guide plate is in a range of 1 to 5 mm.

12. The backlight module according to claim 11, characterized in that: The fourth bonding portion is in strip shape, The angle between the length direction of the fourth bonding portion and the extension direction of the connecting line is greater than or equal to 0° and less than 90°, The width of the fourth bonding portion ranges from 2 to 5 mm; The thickness of the fourth bonding portion is in the range of 0.03 to 0.05 mm.

13. The backlight module according to claim 10, characterized in that: The first bonding part, the second bonding part, the third bonding part and the fourth bonding part include double-sided adhesive or transparent optical adhesive.

14. The backlight module according to claim 8, characterized in that: It also includes an optical film layer and a middle frame. The optical film layer is located on a side of the light guide plate away from the bottom reflector, and the orthographic projection of the optical film layer on the bottom wall of the cavity at least covers the orthographic projection of the light guide plate on the bottom wall of the cavity; The middle frame includes a first part and a second part, wherein the first part and the second part are connected as a whole; The first portion is disposed around the side wall of the cavity, the second portion is located on a side of the optical film layer away from the light guide plate, and the second portion overlaps with an orthographic projection of an edge of the optical film layer on the bottom wall of the cavity.

15. A display module, characterized in that: A backlight module comprising any one of claims 1-14.

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