CN115685437A

CN115685437A - Backlight module and display device

Info

Publication number: CN115685437A
Application number: CN202211021319.3A
Authority: CN
Inventors: 陈如星; 柯耀作; 林伟华
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2023-02-03

Abstract

The application discloses backlight module and display device, backlight module includes the light guide plate, first light source subassembly, the reflector plate, first sticky tape and backplate, the light guide plate includes relative play plain noodles, the back, connect in play plain noodles and back and relative first side, the second side and by the main part that first side distributes in succession to the direction of second side, first transition portion and first portion of thinning, the main part is greater than the thickness of first portion of thinning in the direction from going out the plain noodles to the back, first transition portion is including being located the back and from the first inclined plane that the portion of thinning extends to the main part slope, first light source subassembly is located first side of light guide plate, the reflector plate is located the back one side of light guide plate, first sticky tape holds in the first portion of holding that forms by first portion of thinning, first transition portion and reflector plate enclose. According to the embodiment of the application, the backlight module has a better light emitting effect.

Description

Backlight module and display device

Technical Field

The application belongs to the technical field of display, and particularly relates to a backlight module and a display device.

Background

With the rapid development of display technology, liquid crystal display devices (such as lcd televisions, lcd monitors, lcd panels, etc.) rely on low voltage driving and flat panel structures, and have the advantages of large display information amount, easy colorization, long service life, no radiation and no pollution, so that the liquid crystal display devices are more and more widely applied in production and life. However, the lcd device is a passive display device, which cannot emit light, and a backlight module is disposed below the lcd panel to provide the required light source, so as to achieve the display effect.

The backlight module is one of the key components of the liquid crystal display device, and has the main function of providing a uniform and high-brightness luminous body for the liquid crystal panel. Along with the development of display technology, the consumer is more and more high to display device's picture quality requirement, and backlight unit's performance has great influence to display device's picture quality, consequently, how to make backlight unit have better luminous effect, has become the important subject of current technical field research.

Disclosure of Invention

The embodiment of the application provides a backlight module and a display device, so that the backlight module has a better light emitting effect.

In a first aspect, an embodiment of the present application provides a backlight module, including: the light guide plate comprises a light emitting surface, a back surface, a first side surface, a second side surface, a main body part, a first transition part and a first thinning part, wherein the light emitting surface is opposite to the back surface, the first side surface and the second side surface are connected to the light emitting surface and the back surface, the main body part, the first transition part and the first thinning part are distributed in sequence in the direction from the first side surface to the second side surface, the thickness of the main body part in the direction from the light emitting surface to the back surface is larger than that of the first thinning part, the first transition part comprises a first inclined surface, and the first inclined surface is positioned on the back surface and extends obliquely from the first thinning part to the main body part; the first light source component is positioned on one side of the first side surface of the light guide plate; a reflective sheet positioned at one side of the back of the light guide plate; the first adhesive tape is accommodated in a first accommodating part formed by enclosing the first thinning part, the first transition part and the reflecting sheet so as to fix the light guide plate and the reflecting sheet; and the backboard comprises a side plate and a bottom plate, the bottom plate is arranged on one side of the reflector plate, which deviates from the light guide plate, the side plate and the bottom plate enclose and form an accommodating space, and the first light source assembly, the light guide plate and the reflector plate are accommodated in the accommodating space.

Optionally, the backlight module further comprises a rubber frame, the rubber frame is fixedly connected with the back plate, and at least part of the rubber frame is located between the light guide plate and the side plate.

Optionally, the rubber frame comprises a limiting groove, and the reflecting sheet part is located inside the limiting groove.

Optionally, the overlapping length of the orthographic projection of the reflector plate and the limiting groove on the back plate is greater than or equal to 0.5mm and less than or equal to 0.6mm.

Optionally, the backlight module includes a second adhesive tape disposed between the reflective sheet and the bottom plate to fix the reflective sheet and the bottom plate.

Optionally, the length of the second tape in the direction from the first side to the second side is greater than or equal to 2.5mm.

Optionally, the light guide plate includes a third side surface and a fourth side surface opposite to the light emitting surface, the back surface, the first side surface and the second side surface, and the backlight module includes a second light source assembly disposed on one side of the third side surface.

Optionally, the light guide plate includes a second transition portion and a second thinning portion, the main portion, the second transition portion and the second thinning portion are sequentially distributed in a direction from the third side surface to the fourth side surface, a thickness of the main portion in the direction from the light emitting surface to the back surface is greater than a thickness of the second thinning portion, the second transition portion includes a second inclined surface, the second inclined surface is located on the back surface and extends obliquely from the second thinning portion to the main portion, and the first adhesive tape is accommodated in a second accommodating portion formed by the second thinning portion, the second transition portion and the reflective sheet in an enclosed manner.

Optionally, the first thinned portion and the second thinned portion have equal thicknesses in a direction from the light emitting surface to the back surface.

Optionally, the first and second receptacles are in communication with each other.

Optionally, the first inclined plane is connected to the second inclined plane, and an included angle formed by the first inclined plane and the plane of the backlight module and close to the first light source assembly is equal to an included angle formed by the second inclined plane and the plane of the backlight module and close to the second light source assembly.

Optionally, the first adhesive tape and the orthographic projection of the first inclined surface on the back plate do not overlap.

Optionally, the orthographic projections of the first adhesive tape and the reflective sheet on the back plate overlap each other, and the orthographic projections of the first adhesive tape and the light guide plate on the back plate at least partially overlap.

Optionally, one end of the first adhesive tape close to the side plate and one end of the reflection sheet close to the side plate are flush with each other.

Optionally, the length of the first tape in the direction from the first side to the second side is greater than or equal to 1.25mm and less than or equal to 2.5mm.

Optionally, the projections of the first and second tapes on the back panel at least partially overlap.

Optionally, an included angle formed by the first inclined surface and a plane where the backlight module is located and away from the first light source assembly is greater than or equal to 45 ° and less than or equal to 60 °.

In a second aspect, an embodiment of the present application provides a display device, including: a backlight module according to any one of the first aspect; and the display panel is positioned on one side of the light-emitting surface of the backlight module.

The backlight module of the embodiment of the application comprises a main body part, a first transition part and a first thinning part which are arranged between a first side face and a second side face of a light guide plate and are distributed in sequence, wherein the thickness of the main body part in the direction from a light-emitting face to the back face of the light guide plate is larger than that of the first thinning part, so that a first inclined face of the first transition part is transited between the main body part and the first thinning part, and a first adhesive tape for bonding the light guide plate and a reflector plate is accommodated in a first accommodating part formed by the first thinning part, the first transition part and the reflector plate. The first inclined plane is arranged, so that light transmitted from the first side face to the second side face in the light guide plate by the first light source assembly can be reflected on the first inclined plane, the quantity of the light projected on the first adhesive tape is reduced, the gathering effect of the light on the edge of the first adhesive tape is weakened, the possibility that the light is refracted on the edge of the first adhesive tape in a large quantity is weakened, and therefore the phenomenon that the refracted light is projected on the light emitting face of the light guide plate to generate a bright band located at the edge of the light emitting face is avoided, and the bright band is called as a white mark. Therefore, the first inclined surface is arranged to improve the light emitting effect of the backlight module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an example of a backlight module according to some embodiments of the present application;

FIG. 2 isbase:Sub>A cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is an enlarged schematic view of FIG. 2 at circle M;

FIG. 4 is an enlarged schematic view of FIG. 2 at circle N;

FIG. 5 is a schematic structural diagram of another example of a backlight module according to some embodiments of the present application;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is an enlarged view of the circle P in FIG. 6;

FIG. 8 is a schematic structural diagram of a backlight module according to some embodiments of the present application;

FIG. 9 is a bottom view of a light guide plate of the backlight module shown in FIG. 8;

FIG. 10 is a cross-sectional view taken along line C-C of FIG. 8;

FIG. 11 is an enlarged view of FIG. 10 at circle Q;

FIG. 12 is a bottom view of another light guide plate of the backlight module shown in FIG. 8;

fig. 13 is a schematic structural diagram of a display device according to some embodiments of the present application;

fig. 14 is a cross-sectional view taken along line K-K' of fig. 13.

Reference numerals are as follows:

100. a backlight module;

1. a light guide plate; 101. a light-emitting surface; 102. a back side; 103. a first side; 104. a second side surface; 105. a third side; 106. a fourth side; 11. a main body portion; 121. a first transition portion; 1201. a first inclined surface; 122. a second transition portion; 1202. a second inclined surface; 131. a first thinned portion; 132. a second thinned portion; 21. a first light source assembly; 22. a second light source assembly; 3. a reflective sheet; 41. a first adhesive tape; 42. a second tape; 5. a back plate; 51. a side plate; 52. a base plate; 6. a rubber frame; 61. a limiting groove; I. a first accommodating portion; II. A second accommodating portion;

200. a display panel; 1000. a display device;

x, a first direction; y, a second direction; z, third direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the preceding and following associated objects are in an "or" relationship.

In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

In the related art, the light source of the side-in type backlight module is usually disposed at one side of the light guide plate, and the other end of the light guide plate, which is far away from the light source, is fixed on the back plate by using a fixing tape. However, in the backlight module configured as above, the applicant noticed that since the adhesive tape for fixing the light guide plate and the reflective sheet is usually made of transparent material, light is easy to propagate therein, and when light emitted from the light source disposed at one side of the light guide plate is transmitted inside the light guide plate and reaches the other side, the light is projected on the adhesive tape, unnecessary refraction occurs inside the adhesive tape, so that the refracted light is projected on the light guide plate, and a bright band, called as a white mark, is generated at an edge close to the light exit surface. In addition, due to the requirement for a narrow frame of the display device, the edge of the reflector plate between the light guide plate and the back plate has a certain distance from the frame, and when light emitted by the light source is projected to the edge of one end of the reflector plate far away from the light source, the reflector plate has a certain thickness, so that unnecessary refraction is easy to occur, and white marks on the light emitting surface are formed.

In view of this, the embodiment of the present application provides a backlight module, in which a main body portion, a first transition portion, and a first thinning portion are sequentially disposed between a first side surface and a second side surface of a light guide plate, a thickness of the main body portion in a direction from a light emitting surface to a back surface of the light guide plate is greater than a thickness of the first thinning portion, so that a first inclined surface of the first transition portion transitions between the main body portion and the first thinning portion, a first adhesive tape adhering the light guide plate and a reflective sheet is accommodated in a first accommodating portion formed by the first thinning portion, the first transition portion, and the reflective sheet, and an effect of an edge of the first adhesive tape on focusing is weakened by the first inclined surface, thereby preventing a white mark from appearing on the light emitting surface of the backlight module.

The technical scheme described in the embodiment of the application is suitable for the backlight module, and comprises a display device of the backlight module.

Fig. 1 is a schematic structural diagram of an example of a backlight module 100 according to some embodiments of the present disclosure. Fig. 2 isbase:Sub>A cross-sectional view taken alongbase:Sub>A-base:Sub>A in fig. 1. As shown in fig. 1 and fig. 2, the backlight module 100 is a side-in type backlight module 100, and the backlight module 100 includes a light guide plate 1, a first light source assembly 21, a reflector plate 3, a first adhesive tape 41, and a back plate 5.

The back plate 5 includes a side plate 51 and a bottom plate 52, the bottom plate 52 is disposed on one side of the reflective sheet 3 departing from the light guide plate 1, the side plate 51 and the bottom plate 52 enclose to form an accommodating space, and the first light source assembly 21, the light guide plate 1 and the reflective sheet 3 are accommodated in the accommodating space. At least part of the bottom plate 52 extends parallel to the light emitting surface 101 of the light guide plate 1, and the plane of the side plate 51 intersects the light emitting surface 101. The bottom plate 52 and the side plates 51 of the back plate 5 can be integrally formed, thereby improving the manufacturing efficiency of the backlight module 100 and enhancing the structural stability of the backlight module 100. Alternatively, the bottom plate 52 may be made of iron, and the side plate 51 may be made of a rubber material, which is not limited in this embodiment of the application.

Alternatively, the bottom plate 52 may be provided with a sunken groove at a position corresponding to the first light source assembly 21 to receive a circuit board (not shown) of the first light source assembly 21, the circuit board being electrically connected to the first light source assembly 21. When the circuit board is located between the first light source assembly 21 and the bottom plate 52, the frame of the backlight module 100 can be further shrunk, so that the screen occupation ratio of the display device 1000 using the backlight module 100 can be improved.

Fig. 3 is an enlarged schematic view of fig. 2 at circle M. Fig. 4 is an enlarged schematic view of fig. 2 at circle N. As shown in fig. 3 and 4, the light guide plate 1 includes a light emitting surface 101, a back surface 102, a first side surface 103 and a second side surface 104 connected to the light emitting surface 101 and the back surface 102 and opposite to each other, and a main body portion 11, a first transition portion 121 and a first thinning portion 131 sequentially distributed in a direction from the first side surface 103 to the second side surface 104, wherein a thickness of the main body portion 11 in the direction from the light emitting surface 101 to the back surface 102 is greater than a thickness of the first thinning portion 131, the first transition portion 121 includes a first inclined surface 1201, and the first inclined surface 1201 is located on the back surface 102 and extends obliquely from the first thinning portion 131 to the main body portion 11. The first light source assembly 21 is located at the first side surface 103 side of the light guide plate 1. The reflective sheet 3 is located on the back surface 102 side of the light guide plate 1. The first tape 41 is accommodated in a first accommodating portion I surrounded by the first thinned portion 131, the first transition portion 121, and the reflective sheet 3, so as to fix the light guide plate 1 and the reflective sheet 3.

For convenience of description, in the following description, a direction from the first side surface 103 to the second side surface 104 is a first direction, i.e., an X direction, a direction from the light emitting surface 101 to the back surface 102 is a third direction, i.e., a Z direction, and the first direction X and the third direction Z intersect with each other, so that the first side surface 103 and the second side surface 104 are connected to the light emitting surface 101 and the back surface 102. That is, the light emitting surface 101 and the back surface 102 extend in the first direction X and are opposite to each other in the third direction Z, and the first side surface 103 and the second side surface 104 extend in the third direction Z and are opposite to each other in the first direction X. In the embodiment of the present application, the first direction X and the third direction Z are perpendicular to each other, and it should be understood that when the X direction and the Z direction are at an angle of 85 ° to 95 ° to each other, the first direction X and the third direction Z can be regarded as being perpendicular to each other. Optionally, the direction from the first side surface 103 to the second side surface 104 and the direction from the light emitting surface 101 to the back surface 102 may also be other intersecting directions, which is not described herein again.

In the embodiment of the present application, the light guide plate 1 extends along the first direction X, the first light source assembly 21 is disposed at one side of the first side surface 103, the main body 11, the first transition portion 121, and the first thinning portion 131 are sequentially arranged between the first side surface 103 and the second side surface 104 along the first direction X, and the first thinning portion 131 is located at a distal end of the first light source assembly 21, so that the light emitted by the first light source assembly 21 enters the light guide plate 1 from the first side surface 103 and is collected towards the second side surface 104 along the first direction X.

The thickness of the main body portion 11 is greater than the thickness of the first thinned portion 131 in the third direction Z, the first transition portion 121 is located between the first thinned portion 131 and the main body portion 11, and the thickness of the first transition portion 121 in the third direction Z gradually decreases from the main body portion 11 to the first thinned portion 131. The first transition portion 121 includes a first inclined surface 1201, the first inclined surface 1201 is located on the back surface 102, and the upper surfaces of the main body portion 11, the first transition portion 121 and the first thinning portion 131 in the third direction Z are located on the same plane, that is, in the light emitting surface 101, so that the back surface 102 of the light guide plate 1 is composed of the lower surfaces of the main body portion 11 and the first thinning portion 131 in the third direction Z and the first inclined surface 1201, and the extending direction of the first inclined surface 1201 has a certain included angle compared to the first direction X. Since the light travels along a straight line, a part of the light is reflected by being projected on the first inclined surface 1201.

The reflective sheet 3 is disposed on the back surface 102 side of the light guide plate 1, i.e. between the light guide plate 1 and the bottom plate 52 of the back plate 5, to reflect the light incident on the light guide plate 1, thereby further improving the brightness of the backlight module 100. The first adhesive tape 41 is disposed in the first receiving portion I surrounded by the first thinning portion 131, the first transition portion 121, and the reflective sheet 3 to fix the light guide plate 1 and the reflective sheet 3. That is, the first tape 41 is attached to at least the lower surface of the first thinned portion 131 and the upper surface of the reflective sheet 3 in the third direction Z at the same time, so as to achieve a good attaching effect.

Light emitted by the first light source assembly 21 enters the light guide plate 1 from the first side surface 103 and is transmitted to the second side surface 104 along the first direction X, and part of the light is projected onto the first inclined surface 1201 to be reflected, so that the light projected onto the first adhesive tape 41 on one side of the first inclined surface 1201 is reduced, the light gathering effect of the edge of the first adhesive tape 41 on light is improved, that is, the possibility that a large amount of light is refracted at the edge of the first adhesive tape 41 is reduced, white marks on the light-emitting surface 101 of the backlight module 100 are avoided, and the light-emitting effect of the backlight module 100 is improved.

In some embodiments of the present application, the first adhesive tape 41 does not overlap with an orthographic projection of the first inclined surface 1201 on the back plate 5.

The first tape 41 is located between the first thinned portion 131 and the reflection sheet 3 in the third direction Z and on the side of the first transition portion 121 close to the first thinned portion 131 in the first direction X. The first tape 41 does not enter between the first transition portion 121 and the reflective sheet 3, and keeps a distance from the first inclined surface 1201, when the light emitted by the first light source assembly 21 is reflected by the first inclined surface 1201, the first inclined surface 1201 prevents the light from reaching the edge of the first tape 41, so as to prevent the light from being collected at the edge of the first tape 41 and generating white marks on the light emitting surface 101 of the backlight module 100.

Alternatively, the edge of the first adhesive tape 41 may coincide with the joint of the first transition portion 121 with the first thinned portion 131, or may be spaced apart from the joint of the first transition portion 121 with the first thinned portion 131, so as to ensure that the first adhesive tape 41 has a sufficient length in the first direction X to provide a sufficient adhesive force to the light guide plate 1 and the reflective sheet 3, which is not limited in this embodiment of the application.

In some embodiments of the present application, the orthographic projection of the first adhesive tape 41 and the reflective sheet 3 on the back panel 5 overlap each other, and the orthographic projection of the first adhesive tape 41 and the light guide plate 1 on the back panel 5 at least partially overlap.

The first tape 41 is disposed between the light guide plate 1 and the reflective sheet 3, completely adhered to the reflective sheet 3, and at least partially adhered to the light guide plate 1. That is, one end of the first tape 41 close to the side plate 51 may partially protrude from the light guide plate 1, and one end of the reflective sheet 3 close to the side plate 51 may partially protrude from the first tape 41. In the first direction X, the relationship between the distance between the reflective sheet 3, the first tape 41, and the light guide plate 1 and the side plate 51 is: the distance between the reflective sheet 3 and the side plate 51 is less than or equal to the distance between the first tape 41 and the side plate 51, and the distance between the first tape 41 and the side plate 51 is less than or equal to the distance between the light guide plate 1 and the side plate 51.

The first adhesive tape 41 is completely attached to the reflective sheet 3 and protrudes from the light guide plate 1 in the first direction X, so that effective adhesion can be provided for the light guide plate 1, and the adhesive strength between the light guide plate 1 and the reflective sheet 3 is improved.

In some embodiments of the present application, the backlight module 100 further includes a rubber frame 6, the rubber frame 6 is fixedly connected to the back plate 5, and at least a portion of the rubber frame 6 is located between the light guide plate 1 and the side plate 51.

The bezel 6 is disposed around the light guide plate 1, i.e., fixed to the entire side plate 51 around the light guide plate 1. Glue frame 6 and light guide plate 1 and set up and all keep the certain distance between the first light source subassembly 21 of light guide plate 1 one side, avoid taking place the structure with taking place between the light guide plate 1 and interfere, and avoid being too close to and lead to gluing frame 6 and being heated and take place deformation with first light source subassembly 21 distance.

Optionally, the material of the rubber frame 6 may be a material with a lower expansion coefficient as much as possible, so as to reduce the possibility of deformation of the rubber frame 6, for example, plastic, which is not limited in this embodiment.

In some alternative embodiments, the adhesive frame 6 includes a limiting groove 61, and the reflective sheet 3 is partially located inside the limiting groove 61.

The limiting groove 61 is located on a side of the rubber frame 6 away from the first light source assembly 21 in the first direction X, that is, on the side of the second side surface 104 of the light guide plate 1. The light incident on the light guide plate 1 is collected at the second side surface 104 and reflected at the surface of the reflective sheet 3 at the corresponding position. The reflecting sheet 3 is partially positioned in the limiting groove 61, that is, the edge of the reflecting sheet 3 is disposed inside the rubber frame 6, so as to eliminate the light reflected at the edge of the reflecting sheet 3, avoid white marks at the light emitting surface 101 of the light guide plate 1, and improve the light emitting quality of the backlight module 100.

Optionally, a certain gap may be reserved between the limiting groove 61 and the reflector plate 3, and a certain space is reserved for the reflector plate 3 and the rubber frame 6 to avoid mutual extrusion of the rubber frame 6 and the reflector plate 3 due to thermal expansion, thereby ensuring structural stability of the backlight module 100.

The overlapping length of the orthographic projections of the reflector plate 3 and the limiting groove 61 on the back plate 5 is more than or equal to 0.5mm and less than or equal to 0.6mm.

The size of the reflector 3 extending into the limiting groove 61 in the first direction X is greater than or equal to 0.5mm and less than or equal to 0.6mm. When the size of the reflector 3 extending into the limiting groove 61 is smaller than 0.5mm along the first direction X, the edge of the reflector 3 is closer to the notch of the limiting groove 61, the limiting groove 61 limits the reflection of the edge of the reflector 3 to light, and the bad conditions that the backlight module 100 has white marks on the light emitting surface 101 cannot be avoided. When the reflector 3 extends into the limiting groove 61 along the first direction X and the size of the limiting groove 61 is larger than 0.6mm, the depth of the limiting groove 61 needs to be at least larger than 0.6mm, so that the rubber frame 6 between the reflector 3 and the back plate 5 is too thin, the difficulty of process manufacturing is increased, the stress born by the rubber frame 6 is small, and the rubber frame is easy to damage.

Therefore, the size of the reflector 3 extending into the limiting groove 61 in the first direction X is greater than or equal to 0.5mm and less than or equal to 0.6mm, and at this time, the rubber frame 6 can eliminate the light reflected at the edge of the reflector 3, so as to avoid the occurrence of white marks on the light emitting surface 101 of the light guide plate 1, and has sufficient structural strength.

Fig. 5 is a schematic structural diagram of another example of the backlight module 100 according to some embodiments of the present disclosure. Fig. 6 is a cross-sectional view taken along line B-B of fig. 5. Fig. 7 is an enlarged schematic view of the circle frame N in fig. 6. As shown in fig. 5, 6 and 7, in other alternative embodiments, the rubber frame 6 may not have the limiting groove 61. In the case where the bezel 6 does not have the stopper groove 61, one end of the first tape 41 adjacent to the side plate 51 and one end of the reflection sheet 3 adjacent to the side plate 51 are flush with each other.

The first tape 41 completely covers the reflective sheet 3 and protrudes from the light guide plate 1 in the first direction X, thereby fixing the light guide plate 1 and the reflective sheet 3. The reflective sheet 3 and one end of the first adhesive tape 41 close to the side plate 51 are flush with each other, so that the edge of the reflective sheet 3 is spaced from the light guide plate 1, and the edge of one end of the reflective sheet 3 away from the first light source assembly 21 is prevented from condensing to form a white mark on the light emitting surface 101.

In some embodiments of the present disclosure, the backlight module 100 includes a second adhesive tape 42, and the second adhesive tape 42 is disposed between the reflective sheet 3 and the bottom plate 52 to fix the reflective sheet 3 and the bottom plate 52.

The second adhesive tape 42 is disposed at one end of the reflector 3 away from the first light source assembly 21, so as to prevent the reflector 3 from generating a light gathering effect at the second adhesive tape 42 when the light incident from the first light source assembly 21 to the light guide plate 1 is reflected, thereby affecting the light emitting effect of the backlight module 100.

Alternatively, an end of the second tape 42 adjacent to the side plate 51 and an end of the reflective sheet 3 adjacent to the side plate 51 are flush with each other, so that the second tape 42 is completely adhered to the reflective sheet 3 to provide sufficient adhesion to the reflective sheet 3 and the rear plate 5.

In some embodiments of the present application, the projections of the first strip 41 and the second strip 42 on the back panel 5 at least partially overlap.

The first tape 41 and the second tape 42 are respectively adhered to the upper surface and the lower surface of the reflective sheet 3 along the third direction Z, and the first tape 41 and the second tape 42 are partially overlapped, so that the stress points of the reflective sheet 3 adhered to the light guide plate 1 and the back plate 5 are close to each other, thereby increasing the stress strength of the reflective sheet 3.

Alternatively, in the case that the bezel 6 does not have the limiting groove 61, an end of the second tape 42 close to the side plate 51 and an end of the first tape 41 close to the side plate 51 are flush with each other to provide a good bonding effect to the light guide plate 1, the reflective sheet 3 and the rear plate 5.

In some embodiments, the second tape 42 has a length of 2.5mm or greater in a direction from the first side 103 to the second side 104.

When the length of the second tape 42 is less than 2.5mm along the first direction X, the adhesive force between the reflector 3 and the back plate 5 is too small, and the reflector is easy to fall off, so that the usability of the backlight module 100 is poor. Therefore, the length of the second adhesive tape 42 is greater than or equal to 2.5mm, so that a firm bonding structure is formed between the reflective sheet 3 and the back plate 5, and the structural strength of the backlight module 100 is improved.

In some embodiments of the present application, the length of the first tape 41 in the direction from the first side 103 to the second side 104 is greater than or equal to 1.25mm and less than or equal to 2.5mm.

When the length of the first tape 41 is less than 1.25mm along the first direction X, the first tape 41 cannot provide enough adhesive force for the light guide plate 1 and the reflective sheet 3, so that the two slide relative to each other, which affects the light emitting effect of the backlight module 100. In order to enable the first adhesive tape 41 to be at least partially accommodated in the first accommodating portion I, a dimension of the first accommodating portion I in the first direction X is similar to a length of the first adhesive tape 41, when the length of the first adhesive tape 41 in the first direction X is greater than 2.5mm, the dimension of the first accommodating portion I in the first direction X is also greater than 2.5mm, and a distance between an edge of the first adhesive tape 41 close to the first inclined surface 1201 and the second side surface 104 is relatively large, which may adversely affect light emitting uniformity of the light guide plate 1 in a region close to the second side surface 104.

Therefore, the dimension of the first adhesive tape 41 in the first direction X is greater than or equal to 1.25mm and less than or equal to 2.5mm, and at this time, the first adhesive tape 41 can firmly fix the light guide plate 1 and the reflective sheet 3, and the light gathering inside the first adhesive tape 41 can be avoided from affecting the light emitting effect of the backlight module 100.

In some embodiments of the present disclosure, an included angle α between the first inclined surface 1201 and the plane where the backlight module 100 is located and the side away from the first light source assembly 21 is greater than or equal to 45 ° and less than or equal to 60 °.

When the included angle α between the first inclined plane 1201 and the first direction X is between 45 ° and 60 °, the light emitted from the first light source assembly 21 enters the light guide plate 1 and is reflected on the first inclined plane 1201 toward the light emitting surface 101. If the included angle α between the first inclined surface 1201 and the first direction X is smaller than 45 ° or larger than 60 °, the reflection falling point of the light emitted by the first light source assembly 21 may be located on the first side surface 103 or the second side surface 104, thereby affecting the light emitting effect of the backlight module 100.

It should be understood that an included angle between the first inclined surface 1201 and the first direction X is related to the thickness of the light guide plate 1 in the third direction Z, as long as the light emitted by the first light source assembly 21 is reflected on the first inclined surface 1201 and falls on the light emitting surface 101, which is not limited herein in the embodiment of the present disclosure.

Fig. 8 is a schematic structural diagram of another example of the backlight module 100 according to some embodiments of the present disclosure. As shown in fig. 8, in some embodiments of the present disclosure, the light guide plate 1 includes a third side 105 and a fourth side 106 connected to the light emitting surface 101, the back 102, the first side 103 and the second side 104 and opposite to each other, the backlight module 100 includes a second light source assembly 22, and the second light source assembly 22 is disposed on one side of the third side 105.

For convenience of description, in the following description, a direction from the third side 105 to the fourth side 106 is taken as a second direction, i.e., a Y direction, and the second direction Y intersects with the first direction X and the third direction Z, so that the third side 105 and the fourth side 106 are connected to the light emitting surface 101, the back surface 102, the first side 103 and the second side 104. The third side 105 and the fourth side 106 extend in the third direction Z and are opposite to each other in the second direction Y. In the embodiment of the present application, the first direction X, the second direction Y and the third direction Z are perpendicular to each other, and it should be understood that when the first direction X, the second direction Y and the third direction Z are at an angle of 85 ° to 95 ° with respect to each other, the first direction X, the second direction Y and the third direction Z can be regarded as perpendicular to each other. Optionally, the direction from the third side 105 to the fourth side 106 may also be other directions, which is not described herein again.

The first light source assembly 21 is disposed on one side of the first side surface 103 of the light guide plate 1, and similarly, the second light source assembly is disposed on one side of the third side surface 105. That is, the first light source assembly 21 and the second light source assembly 22 are respectively disposed on one side of the light guide plate 1 along the first direction X and one side of the second direction Y. Therefore, the first light source assembly 21 and the second light source assembly 22 may be adjacent to each other, and may be combined in an L-shape to partially surround the light guide plate 1. The combination of the first light source assembly 21 and the second light source assembly 22 can increase the brightness of the backlight module 100, so that the backlight module 100 has a more uniform light emitting effect.

Fig. 9 is a bottom view of the light guide plate 1 of the backlight module 100 in fig. 8. Fig. 10 is a cross-sectional view taken along line C-C of fig. 8. Fig. 11 is an enlarged view of fig. 10 at circle Q. As shown in fig. 9, 10 and 11, in some embodiments of the present application, the light guide plate 1 includes a second transition portion 122 and a second thinned portion 132, the main body portion 11, the second transition portion 122 and the second thinned portion 132 are successively distributed in a direction from the third side 105 to the fourth side 106, a thickness of the main body portion 11 in a direction from the light emitting surface 101 to the back surface 102 is greater than a thickness of the second thinned portion 132, the second transition portion 122 includes a second inclined surface 1202, the second inclined surface 1202 is located on the back surface 102 and extends obliquely from the second thinned portion 132 to the main body portion 11, and the first adhesive tape 41 is accommodated in a second accommodating portion II surrounded by the second thinned portion 132, the second transition portion 122 and the reflective sheet 3.

Similarly to the first transition portion 121 and the first thinned portion 131, the main body portion 11, the second transition portion 122 and the second thinned portion 132 are sequentially arranged along the second direction Y between the third side 105 and the fourth side 106, the second thinned portion 132 is located at a distal end of the second light source assembly 22, and light emitted by the second light source assembly 22 enters the light guide plate 1 from the third side 105 and is conducted to the fourth side 106 along the second direction Y. In the third direction Z, the thickness of the main body portion 11 is greater than the thickness of the second thinned portion 132, the second transition portion 122 is located between the second thinned portion 132 and the main body portion 11, and the thickness of the second transition portion 122 in the third direction Z gradually decreases from the main body portion 11 to the second thinned portion 132. The second transition portion 122 includes a second inclined surface 1202, the second inclined surface 1202 is located on the back surface 102, and the extending direction of the second inclined surface 1202 has an angle with respect to the second direction Y. Since the light travels along a straight line, a part of the light is reflected by being projected onto the second inclined surface 1202.

The backlight module 100 may include a plurality of first tapes 41, and the first tapes 41 may be disposed in the first receiving portion I and the second receiving portion II surrounded by the second thinning portion 132, the second transition portion 122 and the reflective sheet 3, so as to adhere the light guide plate 1 and the reflective sheet 3.

Under the condition that the backlight module 100 includes the first light source module 21 and the second light source module 22, the light emitted from the first light source module 21 enters the light guide plate 1 from the first side surface 103 and is transmitted to the second side surface 104 along the first direction X, the light emitted from the second light source module 22 enters the light guide plate 1 from the third side surface 105 and is transmitted to the fourth side surface 106 along the second direction Y, and the light is reflected on the first inclined surface 1201 and the second inclined surface 1202 respectively, so as to improve the light gathering effect at the edge of the first tape 41, avoid the occurrence of white marks on the light emitting surface 101 of the backlight module 100, and improve the light emitting effect of the backlight module 100.

Fig. 12 is a bottom view of another light guide plate 1 of the backlight module 100 in fig. 8. As shown in fig. 12, in some embodiments of the present application, the first container I and the second container II communicate with each other.

The first accommodating part I is located at one end of the light guide plate 1 in the first direction X, the second accommodating part II is located at one end of the light guide plate 1 in the second direction Y, light emitted by the first light source assembly 21 is projected towards the first accommodating part I, light emitted by the second light source assembly 22 is projected towards the second accommodating part II, and under the condition that the first accommodating part I and the second accommodating part II are communicated with each other, the first inclined surface 1201 and the second inclined surface 1202 can better reflect light at the joint of the first accommodating part I and the second accommodating part II, so that white marks on the light emitting surface 101 are eliminated.

The first tape 41 is bent between the first accommodating portion I and the second accommodating portion II, so that the same first tape 41 is provided in the first accommodating portion I and the second accommodating portion II. In this case, the first tape 41 has a large adhesive area, and can provide a large adhesive force between the light guide plate 1 and the reflective sheet 3.

In some embodiments of the present disclosure, the first inclined surface 1201 is connected to the second inclined surface 1202, and an included angle between the first inclined surface 1201 and the plane where the backlight module 100 is located and which is close to the first light source assembly 21 is equal to an included angle between the second inclined surface 1202 and the plane where the backlight module 100 is located and which is close to the second light source assembly 22.

In a case where first accommodating portion I and second accommodating portion II communicate with each other, first inclined surface 1201 may be in contact with second inclined surface 1202. Thus, the light emitted by the first light source assembly 21 and the second light source assembly 22 can be reflected more on the first inclined surface 1201 and the second inclined surface 1202, the more the light can be reflected by the first inclined surface 1201 and the second inclined surface 1202, the better the white mark eliminating effect is, and the better the light emitting effect of the backlight module 100 is.

The included angle between the first inclined surface 1201 and the first direction X may be the same as the included angle between the second inclined surface 1202 and the second direction Y, that is, the thicknesses of the first thinned portion 131 and the second thinned portion 132 in the third direction Z are equal, and the thickness change rates of the first transition portion 121 and the second transition portion 122 in the first direction X and the second direction Y are also equal. The first inclined surface 1201 and the second inclined surface 1202 have the same inclination angle, which is beneficial to the manufacture of the light guide plate 1, and the light rays have the same refraction effect at the first inclined surface 1201 and the second inclined surface 1202, which is beneficial to the light emitting uniformity of the backlight module 100.

Alternatively, the thicknesses of the light guide plate 1 in the third direction Z of the first thinned portion 131 and the second thinned portion 132 may not be equal, and in this case, the inclinations of the first inclined surface 1201 and the second inclined surface 1202 are different, and the first inclined surface 1201 and the second inclined surface 1202 may smoothly transition with each other.

Fig. 13 is a schematic structural diagram of a display device 1000 according to some embodiments of the present disclosure. Fig. 14 is a cross-sectional view taken along line K-K' of fig. 13. As shown in fig. 13 and 14, the display device 1000 provided in this embodiment includes the backlight module 100 and the display panel 200, where the display panel 200 is located at one side of the light emitting surface 101 of the backlight module 100.

In summary, in some optional embodiments of the present disclosure, the backlight module 100 for the display device 1000 includes a light guide plate 1, a first light source assembly 21, a reflective sheet 3, a first adhesive tape 41, and a back plate 5. The light guide plate 1 includes a light emitting surface 101, a back surface 102, a first side surface 103, a second side surface 104 connected to the light emitting surface 101 and the back surface 102 and opposite to each other, and a main body portion 11, a first transition portion 121, and a first thinning portion 131 sequentially distributed in a direction from the first side surface 103 to the second side surface 104, wherein a thickness of the main body portion 11 in the direction from the light emitting surface 101 to the back surface 102 is greater than a thickness of the first thinning portion 131, the first transition portion 121 includes a first inclined surface 1201, and the first inclined surface 1201 is located on the back surface 102 and extends obliquely from the first thinning portion 131 to the main body portion 11. The first light source assembly 21 is located at the first side surface 103 side of the light guide plate 1. The reflective sheet 3 is located on the back surface 102 side of the light guide plate 1. The first tape 41 is accommodated in a first accommodating portion I surrounded by the first thinned portion 131, the first transition portion 121, and the reflective sheet 3, so as to fix the light guide plate 1 and the reflective sheet 3.

In the backlight module 100 according to the embodiment of the present application, the main body 11, the first transition portion 121 and the first thinned portion 131 are disposed between the first side surface 103 and the second side surface 104 of the light guide plate 1, and the thickness of the main body 11 in the direction from the light emitting surface 101 to the back surface 102 of the light guide plate 1 is greater than that of the first thinned portion 131, so that the first inclined surface 1201 of the first transition portion 121 transitions between the main body 11 and the first thinned portion 131, and the first adhesive tape 41 adhering the light guide plate 1 and the reflective sheet 3 is accommodated in the first accommodating portion I formed by the first thinned portion 131, the first transition portion 121 and the reflective sheet 3. In the embodiment of the application, by providing the first inclined surface 1201, the light emitted by the first light source assembly 21 and transmitted from the first side surface 103 to the second side surface 104 in the light guide plate 1 can be reflected on the first inclined surface 1201, so as to reduce the amount of light projected onto the first adhesive tape 41, so as to weaken the concentration effect of the light at the edge of the first adhesive tape 41, that is, weaken the possibility that a large amount of light is refracted at the edge of the first adhesive tape 41, thereby preventing the refracted light from being projected onto the light emitting surface 101 of the light guide plate 1 to generate a bright band at the edge of the light emitting surface 101, which is called as a white mark. Therefore, the first inclined surface 1201 can improve the light emitting effect of the backlight module 100.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Claims

1. A backlight module, comprising:

the light guide plate comprises a light emitting surface, a back surface, a first side surface, a second side surface, a main body part, a first transition part and a first thinning part, wherein the light emitting surface is opposite to the back surface, the first side surface and the second side surface are connected with the light emitting surface and the back surface and are opposite to each other, the main body part is sequentially distributed from the first side surface to the second side surface, the thickness of the main body part in the direction from the light emitting surface to the back surface is larger than that of the first thinning part, the first transition part comprises a first inclined surface, and the first inclined surface is positioned on the back surface and obliquely extends from the first thinning part to the main body part;

the first light source component is positioned on one side of the first side surface of the light guide plate;

a reflective sheet positioned at one side of the back surface of the light guide plate;

a first adhesive tape accommodated in a first accommodating portion surrounded by the first thinned portion, the first transition portion, and the reflective sheet to fix the light guide plate and the reflective sheet; and

the backboard comprises a side plate and a bottom plate, the bottom plate is arranged on one side of the light guide plate away from the reflector plate, the side plate and the bottom plate enclose to form an accommodating space, and the first light source assembly, the light guide plate and the reflector plate are accommodated in the accommodating space.

2. The backlight module according to claim 1, further comprising a rubber frame, wherein the rubber frame is fixedly connected to the back plate, and at least a portion of the rubber frame is located between the light guide plate and the side plate.

3. The backlight module as claimed in claim 2, wherein the frame comprises a spacing groove, and the reflective sheet is partially disposed in the spacing groove.

4. The backlight module according to claim 3, wherein the overlapping length of the orthographic projection of the reflector plate and the limiting groove on the back plate is greater than or equal to 0.5mm and less than or equal to 0.6mm.

5. The backlight module according to claim 1, wherein the backlight module comprises a second adhesive tape disposed between the reflector and the bottom plate to fix the reflector and the bottom plate.

6. The backlight module according to claim 5, wherein the second tape has a length of 2.5mm or more in a direction from the first side to the second side.

7. The backlight module as claimed in claim 1, wherein the light guide plate includes third and fourth opposite side surfaces connected to the light emitting surface, the back surface, the first side surface and the second side surface, and the backlight module includes a second light source assembly disposed at one side of the third side surface.

8. The backlight module according to claim 7, wherein the light guide plate comprises a second transition portion and a second thinned portion, the main portion, the second transition portion and the second thinned portion are sequentially distributed in a direction from the third side to the fourth side, a thickness of the main portion in the direction from the light emitting surface to the back surface is greater than a thickness of the second thinned portion, the second transition portion comprises a second inclined surface, the second inclined surface is located on the back surface and extends obliquely from the second thinned portion to the main portion, and the first adhesive tape is received in a second receiving portion surrounded by the second thinned portion, the second transition portion and the reflective sheet.

9. The backlight module as claimed in claim 8, wherein the first thinned portion and the second thinned portion have equal thickness in a direction from the light emitting surface to the back surface.

10. A backlight module according to claim 8, wherein the first and second receiving portions are in communication with each other.

11. The backlight module as claimed in claim 10, wherein the first inclined surface is connected to the second inclined surface, and an included angle between the first inclined surface and a plane of the backlight module, the included angle being close to the first light source assembly, is equal to an included angle between the second inclined surface and the plane of the backlight module, the included angle being close to the second light source assembly.

12. The backlight module as claimed in claim 1, wherein the first adhesive tape does not overlap with an orthographic projection of the first inclined surface on the back plate.

13. The backlight module according to claim 12, wherein the orthographic projections of the first adhesive tape and the reflective sheet on the back plate overlap each other, and the orthographic projections of the first adhesive tape and the light guide plate on the back plate at least partially overlap.

14. A backlight module according to claim 13, wherein an end of the first adhesive tape adjacent to the side plate and an end of the reflective sheet adjacent to the side plate are flush with each other.

15. A backlight module according to claim 12, wherein the first tape has a length of 1.25mm or more and 2.5mm or less in a direction from the first side to the second side.

16. The backlight module according to claim 5, wherein the first adhesive tape and the second adhesive tape at least partially overlap in projection on the back plate.

17. The backlight module according to claim 1, wherein an angle between the first inclined surface and a plane of the backlight module, the angle being away from the first light source assembly, is greater than or equal to 45 ° and less than or equal to 60 °.

18. A display device, characterized in that the device comprises:

a backlight module according to any one of claims 1 to 17;

and the display panel is positioned on one side of the light emergent surface of the backlight module.