CN112305812A

CN112305812A - Backlight module and display device

Info

Publication number: CN112305812A
Application number: CN201910706795.0A
Authority: CN
Inventors: 王凯文; 许海峰; 辛武根; 董慧; 丁贺明
Original assignee: BOE Technology Group Co Ltd; Hefei Xinsheng Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Hefei Xinsheng Optoelectronics Technology Co Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2021-02-02

Abstract

A backlight module and a display device are provided. The backlight module includes: a backsheet, the backsheet comprising: a base plate; the first side wall is vertically connected to the bottom plate; the accommodating groove is formed in the first side wall; the light guide plate is arranged on the bottom plate; and the buffer piece is arranged between the light guide plate and the first side wall, and at least one part of the buffer piece is positioned in the accommodating groove.

Description

Backlight module and display device

Technical Field

The invention relates to the technical field of display, in particular to a backlight module and a display device.

Background

In recent years, liquid crystal display devices have been widely used. The current lcd generally includes a backlight module and a display panel, where the display panel of the lcd does not emit light, and the function of displaying images is realized by the light provided by the backlight module. Moreover, with the continuous progress of technology, various display devices including liquid crystal display devices are being developed toward large sizes and narrow frames.

Therefore, how to design the structure of the backlight module to adapt to the technical development direction of large size and narrow frame is becoming one of the important issues facing the skilled in the art.

Disclosure of Invention

In order to solve at least one aspect of the above problems, embodiments of the present disclosure provide a backlight module and a display device including the backlight module.

According to one aspect, there is provided a backlight module including:

a backsheet, the backsheet comprising:

a base plate;

the first side wall is vertically connected to the bottom plate; and

the accommodating groove is formed in the first side wall;

the light guide plate is arranged on the bottom plate; and

a buffer member disposed between the light guide plate and the first sidewall,

wherein at least a portion of the buffer member is located in the receiving groove.

For example, the receiving groove has an opening facing the light guide plate.

For example, at least a portion of an end surface of the buffer member facing the light guide plate contacts the light guide plate, and at least a portion of an end surface of the buffer member facing the receiving groove abuts against an inner wall of the receiving groove.

For example, the accommodating groove penetrates through the first side wall along a first direction, and the first direction is perpendicular to the first side wall.

For example, the buffer member includes a connection structure, and the light guide plate includes a connection fitting structure, and the connection structure is connected with the connection fitting structure.

For example, the connection structure includes:

a connection arm extending from the buffer toward the light guide plate; and

a connection hole formed in the connection arm,

and wherein the connection fitting structure includes a protrusion protruding from the light guide plate toward the connection hole, the protrusion being adapted to be inserted into the connection hole.

For example, the light guide plate includes a first surface facing the base plate and a second surface facing away from the base plate;

the connecting arms comprise a first connecting arm and a second connecting arm, the first connecting arm is positioned on one side of the first surface, which is far away from the light guide plate, the second connecting arm is positioned on one side of the second surface, which is far away from the light guide plate, and each of the first connecting arm and the second connecting arm is provided with the connecting hole;

the projection portion includes a first projection portion projecting from the first surface of the light guide plate toward the connection hole in the first connection arm, and a second projection portion projecting from the second surface of the light guide plate toward the connection hole in the second connection arm.

For example, a first cross-section of the receiving groove is trapezoidal, and the first cross-section is perpendicular to both the bottom plate and the first side wall.

For example, the trapezoid has a first base and a second base parallel to each other, the first base is closer to the light guide plate than the second base, and the length of the first base is greater than the length of the second base.

For example, the trapezoid further has 2 side edges, each of the side edges connects the first bottom edge and the second bottom edge, and at least a portion of the buffer member abuts against the 2 side edges.

For example, the buffer member has a chamfer on an end surface facing the accommodation groove, and a portion of the buffer member having the chamfer abuts on the 2 side edges.

For example, the buffer comprises an elastic material.

For example, the light guide plate includes a first sidewall for introducing light and a second sidewall respectively located at two opposite sides of the light guide plate;

and wherein, first side wall with the second side wall sets up relatively, the bolster sets up between the second side wall of light guide plate and the first side wall.

For example, the back plate further includes a second side wall and a third side wall, and both the second side wall and the third side wall are vertically connected to the bottom plate;

the light guide plate comprises a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall is used for introducing light, the second side wall and the first side wall are respectively positioned at two opposite sides of the light guide plate, and the third side wall and the fourth side wall are connected with the first side wall and the second side wall;

the first side wall and the second side wall are arranged oppositely, the second side wall and the third side wall are arranged oppositely, and the third side wall and the fourth side wall are arranged oppositely;

backlight unit includes 3 the bolster, also be formed with in each of second side wall with the third side wall the holding tank, 3 bolster sets up respectively the second lateral wall of light guide plate with between the first side wall, the third side wall of light guide plate with between the second side wall and the fourth lateral wall of light guide plate with between the third side wall.

According to another aspect, a display device is provided, comprising a backlight module as described above.

Through the embodiment of the disclosure, the light guide plate can be pressed to the buffer piece, so that the buffer piece can move into the accommodating groove to adapt to the technical development direction of large size and narrow frame.

Drawings

Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.

Fig. 1A and 1B are partial schematic structural views of a display device according to an embodiment of the present disclosure;

fig. 2 is a plan view of a backlight module according to an embodiment of the present disclosure;

fig. 3A is a partial cross-sectional view of a backlight module according to an embodiment of the disclosure taken along line AA' in fig. 2;

fig. 3B is a partial cross-sectional view of a backlight assembly according to an embodiment of the disclosure taken along line BB' in fig. 2;

FIG. 4 is a partially exploded view of the backlight assembly shown in FIG. 3A;

fig. 5A is a plan view of a backlight module according to an embodiment of the present disclosure;

fig. 5B is an enlarged view of a portion I in fig. 5A; and

fig. 6A and 6B are partial cross-sectional views of a display device according to an embodiment of the present disclosure, respectively.

It is noted that in the accompanying drawings, which are used to describe embodiments of the invention, the dimensions of layers, structures or regions may be exaggerated or reduced for clarity, i.e., the drawings are not drawn to scale.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.

In this document, unless specifically stated otherwise, directional terms such as "upper", "lower", "left", "right", "inside", "outside", and the like are used to indicate orientations or positional relationships based on the orientation shown in the drawings, merely for convenience in describing the present disclosure, and do not indicate or imply that the referenced device, element, or component must have a particular orientation, be constructed or operated in a particular orientation. It should be understood that when the absolute positions of the described objects are changed, the relative positional relationships they represent may also change accordingly. Accordingly, these directional terms should not be construed as limiting the present disclosure.

Herein, for convenience of description, a light emitting direction of the backlight assembly is defined as an X direction, a direction perpendicular to a sidewall of the light guide plate where light is introduced is defined as a Y direction, and a direction perpendicular to both the X direction and the Y direction is defined as a Z direction.

In this context, the expression "perpendicular", "perpendicular connection" or the like includes not only the case of 90 degrees, i.e., the case of being completely perpendicular, but also the case of being within a certain error range from 90 degrees, for example, the case of being within a process error range from 90 degrees.

Fig. 1A and 1B are partial structural schematic diagrams of a display device according to an embodiment of the present disclosure. For example, the display device shown in fig. 1A and 1B may be a liquid crystal display device. Referring to fig. 1A and 1B in combination, the display device 1 may include a backlight assembly 2, a display panel 4, a middle frame 6, and a front frame 8.

Specifically, the backlight assembly 2 may include a back plate 5, a light source 21, a light guide plate 22, and an optical film set. Alternatively, the backlight module 2 may also be located at the reflective sheet 25 between the back plate 5 and the light guide plate 22.

The back plate 5 may be configured to support and fix the light guide plate 22 and the optical film assembly, and the back plate 5 may include a bottom plate 51 and side walls 52, the bottom plate 51 may have a rectangular shape, and 4 side walls 52 are vertically connected to the periphery of the bottom plate 51 to form a receiving cavity 54 for receiving the light guide plate 22 and the optical film assembly.

For example, the optical film set may include optical films such as a diffusion sheet 23 and a brightness enhancement sheet 24, and it should be understood that the optical film set may also include other types of optical films, and the types of the optical films included in the optical film set may be selected according to actual use requirements.

For example, the light source 21 may include a plurality of Light Emitting Diodes (LEDs).

For example, the backlight module 2 may be a side-in type backlight module. Referring to fig. 1B, the light source 21 may be disposed at one side surface of the light guide plate 22, which is referred to as a light incident surface of the light guide plate 22. That is, the light guide plate 22 has a first sidewall 221 (shown in fig. 1B) for introducing light and a second sidewall 222 (shown in fig. 1A) not for introducing light, the first sidewall 221 and the second sidewall 222 being respectively located at opposite sides of the light guide plate 22. For example, the light guide plate 22 may have a rectangular shape, and the light guide plate 22 may have 1 first sidewall 221, 1 second sidewall 222, and third and fourth sidewalls connecting the first and second sidewalls. The light source 21 is disposed opposite to the first sidewall 221 of the light guide plate 22 so that light from the light source 21 can enter the inside of the light guide plate 22 through the first sidewall 221. Thus, light emitted from the light source 21 is scattered by the light guide plate 22, emitted from a light exit surface of the light guide plate 22 (in fig. 1B, the upper surface of the light guide plate 22 is the light exit surface), and then passes through the optical film group to form a surface light source.

Referring to fig. 1A and 1B, a display panel 4, such as a liquid crystal display panel, may include two substrates that are oppositely disposed, for example, the two substrates may be an array substrate 41 and a color filter substrate 42, respectively. It should be understood that the display panel 4 may further include a liquid crystal layer disposed between the array substrate 41 and the color filter substrate 42. The substrates of the array substrate 41 and the color filter substrate 42 may be glass substrates. In addition, it should be noted that the array substrate and the color filter substrate may adopt the structure of the array substrate and the color filter substrate that are common in the art, and are not described herein again.

The display panel 4 may further include a lower polarizer 43 and an upper polarizer 45, and in the embodiment shown in fig. 1A and 1B, the lower polarizer 43 is disposed on the lower surface of the array substrate 41, and the upper polarizer 45 is disposed on the upper surface of the color filter substrate 42.

Referring to fig. 1A and 1B, the middle frame 6 is used for carrying the display panel 4, and a buffer element 7 such as buffer foam is disposed between a carrying surface of the middle frame 6 and the lower polarizer 43 of the display panel 4, for example. The back plate 5 is provided with a side wall 52, the side wall of the middle frame 6 is combined with the side wall 52 of the back plate 5 in a buckling connection mode, for example, the side wall of the front frame 8 is combined with the side wall of the middle frame 6 in a threaded connection or buckling connection mode, and in this way, the backlight module 2 and the display panel 4 are combined together to form the display device.

As shown in fig. 1A, the backlight module 2 may further include a buffer 9, where the buffer 9 is disposed between the sidewall 52 of the back plate 5 and the second sidewall 222 of the light guide plate 22, and can be at least partially elastically deformed. For example, the buffer 9 may be made of an elastic material such as rubber or silicone. The buffer member 9 is disposed between the sidewall 52 of the back plate 5 and the second sidewall 222 of the light guide plate 22, so that the buffer member 9 does not obstruct the light path of the light emitted from the light source 21, and thus the normal propagation of the light is not affected.

Thus, the light guide plate 22 is assembled to the rear plate 5 in a manner abutting against the buffer 9, and the light guide plate 22 can be prevented from shaking, so that the defects of abnormal noise, scratching of optical films and the like caused by shaking of the light guide plate 22 can be avoided. Further, during the high temperature and high humidity test of the display device, and in the case that the display device is operated for a long time, the light guide plate 22 may be thermally expanded, and at this time, the buffer member 9 may be elastically deformed by the pressing of the light guide plate 22, for example, the buffer member 9 may be compressed to compensate for the thermal expansion amount of the light guide plate 22. Thus, the light guide plate 22 is not deformed and arched by the rigid pressing force, and display failure due to the deformation and arching of the light guide plate is avoided.

In the embodiment of the present disclosure, the buffer 9 may be elastically deformed by the pressing of the light guide plate 22, for example, the compression amount of the buffer 9 may be as high as 50%. Specifically, referring to fig. 1A, a dimension (shown as a width in fig. 1A) of the buffer 9 in the Y direction is marked as a, and a maximum compression amount of the buffer 9 in the Y direction by the pressing action of the light guide plate 22 may be 50%. a, that is, the dimension of the buffer 9 in the Y direction may be compressed to 0.5 a. For example, in a normal temperature state, referring to fig. 1A, the buffer 9 is not pressed by the light guide plate 22, the dimension a of the buffer 9 in the Y direction may be 2 to 4mm, the thermal expansion amount of the light guide plate 22 is 0.8mm or less, and the thermal expansion amount of the light guide plate 22 is less than the maximum compression amount 50% × a (1 to 2mm) of the buffer 9 in the Y direction, so that the compression amount of the buffer 9 can compensate for the thermal expansion amount of the light guide plate 22, and it is possible to ensure that the light guide plate 22 is not deformed and arched by a rigid pressing force, and it is possible to ensure that the buffer 9 can firmly hold the light guide plate 22. That is, the buffer member 9 can ensure the positioning of the light guide plate 22 without affecting the free expansion of the light guide plate 22 at high temperature.

With the continuous progress of technology, various display devices including liquid crystal display devices are developed toward large-sized and narrow frames; meanwhile, display devices using technologies such as GOA are widely used, so that narrow-frame display devices are becoming more and more popular. That is, on one hand, as the size of the display device is increased, the size of the light guide plate included therein is also increased, resulting in that the amount of thermal expansion of the light guide plate is also increased; on the other hand, in the narrow bezel display device, the space available for housing and positioning the buffer member is reduced, resulting in a reduction in the size a of the buffer member and a corresponding reduction in the maximum compression amount of the buffer member. As a result, a case may occur in which the maximum compression amount of the buffer is smaller than the thermal expansion amount of the light guide plate. For example, in a 15-inch narrow-bezel in-vehicle display device, the size a of the buffer is generally 0.8 to 1mm, and the thermal expansion amount of the light guide plate is generally 1mm or more. At this time, the compression amount of the buffer may not be sufficient to compensate for the thermal expansion amount of the light guide plate.

In view of the above situation, embodiments of the present disclosure also provide a backlight module and a display device including the backlight module.

Fig. 2 is a plan view of a backlight assembly according to an embodiment of the present disclosure, fig. 3A is a partial sectional view of the backlight assembly according to an embodiment of the present disclosure taken along line AA 'in fig. 2, and fig. 3B is a partial sectional view of the backlight assembly according to an embodiment of the present disclosure taken along line BB' in fig. 2. With combined reference to fig. 2, 3A and 3B, the backlight assembly 20 may include a back plate 50, a light source 201, a light guide plate 202 and an optical film set.

The back plate 50 may be configured to support and fix the light guide plate 202 and the optical film assembly, and the back plate 50 may include a bottom plate 501 and side walls 502, where the bottom plate 501 may have a rectangular shape, and 4 side walls 502 are vertically connected to the periphery of the bottom plate 501 to form a receiving cavity 504 for receiving the light guide plate 202 and the optical film assembly. Referring to fig. 2, for convenience of description, the left sidewall 502 of the back plate 50 may be referred to as a first sidewall, the upper sidewall 502 of the back plate 50 may be referred to as a second sidewall, the lower sidewall 502 of the back plate 50 may be referred to as a third sidewall, and the right sidewall 502 of the back plate 50 may be referred to as a fourth sidewall.

For example, the optical film set may include optical films such as a diffusion sheet 203 and a brightness enhancement sheet 204, and it should be understood that the optical film set may also include other types of optical films, and the types of the optical films included in the optical film set may be selected according to actual use requirements.

For example, the light source 201 may include a plurality of Light Emitting Diodes (LEDs).

For example, the backlight module 20 may be a side-in type backlight module. Referring to fig. 3B, the light source 201 may be disposed at one side surface of the light guide plate 202, which is referred to as a light incident surface of the light guide plate 202. That is, the light guide plate 202 has a first sidewall 2021 (shown in fig. 3B) for introducing light and a second sidewall 2022 (shown in fig. 3A) for not introducing light, and the first sidewall 2021 and the second sidewall 2022 are respectively located at two opposite sides of the light guide plate 202. For example, the light guide plate 202 may have a rectangular shape, that is, in addition to the above-described first and

second sidewalls

2021 and 2022, the light guide plate 202 may further have a third and

fourth sidewalls

2023 and 2025, each of the third and

fourth sidewalls

2023 and 2025 connecting the first and

second sidewalls

2021 and 2022. The light source 201 is disposed opposite to the first sidewall 2021 of the light guide plate 202 so that light from the light source 201 can enter the inside of the light guide plate 202 through the first sidewall 2021. Thus, light emitted from the light source 201 is scattered by the light guide plate 202, then emitted from a light emitting surface of the light guide plate 202 (in fig. 3B, the upper surface of the light guide plate 202 is the light emitting surface), and then passes through the optical film group to form a surface light source.

Referring to fig. 3A, the backlight module 20 may further include a buffer 90, where the buffer 90 is disposed between the sidewall 502 of the back plate 50 and the second sidewall 2022 of the light guide plate 202, and can be at least partially elastically deformed. For example, the buffer member 90 may be made of an elastic material such as rubber or silicone. The buffer 90 is disposed between the sidewall 502 of the back plate 50 and the second sidewall 2022 of the light guide plate 202, so that the buffer 90 does not obstruct the light path of the light emitted from the light source 201, and the normal propagation of the light is not affected.

With continued reference to fig. 3A, the backplate 50 further includes receiving grooves 503 formed in its sidewalls 502. The buffer 90 is disposed between the light guide plate 202 and the receiving groove 503, and the receiving groove 503 is configured to: in response to the light guide plate 202 pressing the buffer member 90, for example, the light guide plate 202 expands by heat in a high temperature state to press the buffer member 90, the buffer member 90 can move into the receiving groove 503.

Referring to fig. 3A and 4, the position of the receiving groove 503 corresponds to the position of the buffer member 90. More specifically, the receiving groove 503 has an opening 505 facing the light guide plate 202, and a projection of the buffer member 90 in the Y direction falls into the opening 505 of the receiving groove 503. In this way, during the high temperature and high humidity test of the display device, and in the case of long-term operation of the display device, the light guide plate 202 may thermally expand, at this time, the buffer member 90 moves toward the receiving groove 503 and enters the receiving groove 503 under the pressing of the light guide plate 202, and the buffer member 90 itself may be elastically deformed, that is, the buffer member 90 may be compressed. That is, the amount of thermal expansion of the light guide plate 202 can be compensated by the sum of the amount of movement of the buffer 90 and the amount of compression of the buffer 90 itself. The light guide plate 202 is prevented from being deformed and arched due to the rigid pressing force, and poor display caused by the deformation and the arching of the light guide plate is avoided. In addition, the accommodating groove 503 is provided to increase the thickness of the buffer 90, and accordingly, the compression amount of the buffer is increased, so that the high temperature and vibration reliability of the large-size or narrow-bezel display device is improved.

For example, the receiving groove 503 may penetrate through the sidewall 502 of the back plate 50 along the Y direction, so that the movement amount of the buffer 90 may be maximized.

Alternatively, the receiving groove 503 may not penetrate through the sidewall 502 of the back plate 50 in the Y direction, as long as the sum of the maximum moving amount of the buffer 90 and the maximum compression amount of the buffer 90 itself can compensate the thermal expansion amount of the light guide plate 202.

It should be noted that, in this document, the buffer is described as being disposed between the light guide plate and the side wall of the back plate, which means that at least a portion of the buffer is located between the light guide plate and the side wall of the back plate, for example, a portion of the buffer is completely located between the light guide plate and the side wall of the back plate, and another portion of the buffer is located in the accommodating groove of the side wall, and this case can also be described as the buffer is disposed between the light guide plate and the side wall of the back plate.

Fig. 4 is a partially exploded view of the backlight assembly shown in fig. 3A. Referring to fig. 3A and 4 in combination, the receiving groove 503 has an opening area gradually increasing toward the light guide plate 202 so as to receive the buffer 90.

For example, the first cross section of the receiving groove 503 is trapezoidal, and the first cross section is perpendicular to both the bottom plate 501 and the first sidewall 502. The trapezoid has a first bottom edge 5031, a

second bottom edge

5032 and 2

side edges

5033, 5034, the first bottom edge 5031 and the second bottom edge 5032 are parallel to each other, each of the 2

side edges

5033, 5034 connects the first bottom edge 5031 and the second bottom edge 5032, the first bottom edge 5031 is closer to the light guide plate 202 than the second bottom edge 5032, and the length of the first bottom edge 5031 is greater than that of the second bottom edge 5032.

As an example, each of the 2

sides

5033, 5034 of the trapezoid may have a slope of 45 °, i.e., as shown in fig. 3A, each of the 2

sides

5033, 5034 is inclined at an angle of 45 ° with respect to the Y-direction. In this case, the length of the first base 5031 and the length of the second base 5032 have the following relationship: the length of the first base 5031 is equal to the length +2 of the second base 5032, and the thickness of the sidewall 502 in the Y direction.

For example, the length of the first base 5031 of the trapezoid may be substantially equal to the dimension H of the buffer 90 in the X direction (i.e., the height in fig. 4). It should be noted that "substantially equal" herein includes the case of being exactly equal to, and also includes the case of being slightly larger due to factors such as actual processing technology, for example, the difference between the length of the first bottom edge 5031 of the trapezoid and the height H of the buffer 90 is less than or equal to 0.1 mm.

Referring to fig. 3A, at least a portion of an end surface of the buffer 90 facing the light guide plate 202 contacts the light guide plate 202, and at least a portion of an end surface of the buffer 90 facing the receiving groove 503 abuts against an inner wall of the receiving groove 503. For example, referring to fig. 4, the buffer member 90 has a chamfer C on an end surface facing the receiving groove 503, and the dimension of the chamfer C may be generally about 0.2mm, for example. Also, the length of the first bottom side 5031 of the trapezoid is equal to or slightly greater than the dimension (i.e., height in fig. 4) H of the buffer 90 in the X direction. Thus, in the normal temperature state, a portion (e.g., a portion having a chamfer) of the cushion member 90 is inserted into the receiving groove 503 and abuts against the inner wall of the receiving groove 503, as shown in fig. 3A. In this way, the light guide plate 202 still abuts against the side wall of the back plate 50 through the buffer 90, so that the light guide plate 202 can be prevented from shaking, and thus, the defects of abnormal sound, scratching of optical films and the like caused by the shaking of the light guide plate 202 can be avoided.

Alternatively, the first cross section of the receiving groove 503 may have another shape, such as a rectangular shape, and the size of the rectangular receiving groove along the X direction is equal to or slightly smaller than the size (i.e. the height in fig. 4) H of the buffer 90 along the X direction, so that a tight fit (also called an interference fit) is formed between the buffer 90 and the receiving groove 503, and thus, the light guide plate 202 still abuts against the side wall of the back plate 50 through the buffer 90 at normal temperature, so as to fix the light guide plate 202; in a high temperature state, the light guide plate 202 presses the buffer member 90, so that the buffer member 90 moves slowly in the accommodating groove 503.

For example, in the embodiment of the present disclosure, the buffer 90 may be elastically deformed by the pressing of the light guide plate 202, for example, the compression amount of the buffer 90 may be as high as 50%. Specifically, referring to fig. 3A, a dimension (shown as a width in fig. 3A) of the buffer 90 in the Y direction is marked as a, and a maximum compression amount of the buffer 90 in the Y direction by the pressing action of the light guide plate 22 may be 50%. a, that is, the dimension of the buffer 90 in the Y direction may be compressed to 0.5 a.

For example, in the normal temperature state, the light guide plate 202 does not compress the buffer 90, the size a of the buffer 90 in the Y direction may be 0.8mm, and the amount of thermal expansion of the light guide plate 202 may be in the range of 1.5mm or less. The thickness of the back plate 50 may be 1.5mm, that is, the thickness of the bottom plate 501 and the thickness of the side wall 502 of the back plate 50 may be 1.5mm, and then, in the case that the receiving groove 503 penetrates through the side wall 502 of the back plate 50 along the Y direction, the depth of the receiving groove 503 along the Y direction is 1.5mm, so that the maximum moving amount of the buffer 90 may be 1.5 mm. In this case, the sum of the maximum moving amount of the buffer 90 and the maximum compression amount of the buffer 90 itself is equal to 1.9mm, which is larger than the maximum value (1.5mm) of the thermal expansion amount of the light guide plate 202. That is, the sum of the moving amount of the buffer 90 and the compression amount of the buffer 90 itself can compensate the thermal expansion amount of the light guide plate 22, so that it is possible to ensure that the light guide plate 202 is not deformed and arched by a rigid pressing force, and it is possible to ensure that the buffer 90 can firmly catch the light guide plate 202. That is, the buffer member 90 may ensure the positioning of the light guide plate 202 without affecting the free expansion of the light guide plate 202 at high temperature.

Alternatively, the thickness of the backing plate may be any value taken within the range of 0.5 to 1.5mm, e.g., 0.5mm, 0.8mm, 1mm, 1.2mm, etc.; the thermal expansion amount of the light guide plate 202 may be 1.2mm or less. It should be understood that the above numerical values are exemplary only and should not be construed as limiting the embodiments of the present disclosure.

The buffer 90 may further include a connection structure, and the light guide plate 202 may further include a connection fitting structure to which the connection structure may be connected, in such a manner that the buffer 90 may be connected with the light guide plate 202. Like this, under the condition that becomes normal atmospheric temperature state from the high temperature state, light guide plate 202 can pull bolster 90 and remove towards the light guide plate, promptly, draws back bolster 90, guarantees that light guide plate 202 can support and lean on the side wall of backplate 50 through bolster 90 always, realizes the effect of the fixed light guide plate of continuous location.

For example, referring to fig. 4, the connection structure may include a connection arm 902 extending from the buffer 90 toward the light guide plate 202 and a connection hole 904 formed in the connection arm 902. In the embodiment shown in fig. 4, the buffer member 90 includes 2 connecting arms 902 spaced apart in the X direction, and each connecting arm 902 has 1 connecting hole 904 provided therein. The connection fitting structure includes a convex portion 2024 protruding from the light guide plate 202. In the embodiment shown in fig. 4, the light guide plate 202 includes 2 convex portions 2024 that are convex from the upper surface and the lower surface of the light guide plate, respectively. The 2 boss portions 2024 are inserted into the connection holes 904 of the 2 connection arms 902, respectively. Specifically, the light guide plate 202 includes a first surface (i.e., a lower surface in fig. 4) facing the base plate 501 and a second surface (i.e., an upper surface in fig. 4) distant from the base plate 501. The link arm includes a first link arm 902 (i.e., a lower link arm in fig. 4) and a second link arm 902 (i.e., an upper link arm in fig. 4), the lower link arm 902 is located on a side of the lower surface facing away from the light guide plate 202, the upper link arm 902 is located on a side of the upper surface facing away from the light guide plate 202, and the lower link arm 902 and the upper link arm 902 are each formed with the connection hole 904. The protrusions include a first protrusion 2024 (i.e., a lower protrusion in fig. 4) and a second protrusion 2024 (i.e., an upper protrusion in fig. 4), the lower protrusion 2024 protruding from the lower surface of the light guide plate 202 toward the connection hole 904 in the lower connection arm, and the upper protrusion 2024 protruding from the upper surface of the light guide plate 202 toward the connection hole 904 in the upper connection arm. In this way, the connection of the buffer 90 with the light guide plate 202 can be achieved.

For another example, fig. 5A is a plan view of a backlight module according to an embodiment of the disclosure, and fig. 5B is an enlarged view of a portion I in fig. 5A. Referring to fig. 5A and 5B, the connection structure may include a T-shaped connection groove 906 formed in the buffer member 90. The connection mating structure may include a T-shaped protrusion 2026 protruding in a direction. The T-shaped protrusion 2026 is inserted into the T-shaped connection groove 906, and in this way, the connection of the buffer 90 with the light guide plate 202 can be achieved.

With reference to fig. 2, fig. 3A and fig. 3B, the backlight module may include 3 buffering members 90 and 3 receiving grooves 503. As shown in fig. 2, the fourth sidewall 502 of the back plate 50 is opposite to the first sidewall 2021 of the light guide plate 202, and besides the fourth sidewall 502, 3 sidewalls (i.e. the first sidewall, the second sidewall and the third sidewall) are respectively provided with accommodating grooves 503. Correspondingly, 3 buffers 90 are respectively disposed between the 3 sidewalls and the corresponding sidewalls of the light guide plate 202. Specifically, the 3 buffering members 90 are respectively disposed between the second sidewall 2022 of the light guide plate 202 and the first sidewall (i.e., left sidewall) of the back plate 50, between the third sidewall 2023 of the light guide plate 202 and the second sidewall (i.e., upper sidewall) of the back plate 50, and between the fourth sidewall 2025 of the light guide plate 202 and the third sidewall (i.e., lower sidewall) of the back plate 50. Through such a setting mode, the buffer 90 can not obstruct the light path of the light emitted by the light source 201, so that the normal propagation of the light can not be influenced, and moreover, the effect of supporting and positioning the light guide plate can be better played by arranging 3 buffers.

Optionally, the positions of the buffer 90 located between the third sidewall 2023 of the light guide plate 202 and the second sidewall (i.e., the upper sidewall) of the back plate 50 and the buffer 90 located between the fourth sidewall 2025 of the light guide plate 202 and the third sidewall (i.e., the lower sidewall) of the back plate 50 may correspond to each other, and specifically, an orthographic projection (i.e., a projection in the Z direction) of the buffer 90 located between the third sidewall 2023 of the light guide plate 202 and the second sidewall (i.e., the lower sidewall) of the back plate 50 on the third sidewall (i.e., the lower sidewall) may coincide with an orthographic projection (i.e., a projection in the Z direction) of the buffer 90 located between the fourth sidewall 2025 of the light guide plate 202 and the third sidewall (i.e., the lower sidewall) of the back plate 50 on the third sidewall (. Thus, the two buffering members 90 can apply force to the light guide plate 202 from the upper side and the lower side, respectively, and the light guide plate 202 is uniformly stressed.

Fig. 6A and 6B are partial cross-sectional views of a display device according to an embodiment of the present disclosure, respectively. As shown in fig. 6A and 6B, the display device 100 may include a backlight assembly 20, a display panel 40, a middle frame 60, and a front frame 80.

For example, the display device 100 may be a liquid crystal display device, and accordingly, the display panel 40 may be a liquid crystal display panel. Referring to fig. 6A and 6B, the display panel 40 may include two substrates oppositely disposed, for example, the two substrates may be an array substrate 401 and a color filter substrate 402. It should be understood that the display panel 40 may further include a liquid crystal layer disposed between the array substrate 401 and the color filter substrate 402. The substrates of the array substrate 401 and the color filter substrate 402 may be glass substrates. In addition, it should be noted that the array substrate and the color filter substrate may adopt the structure of the array substrate and the color filter substrate that are common in the art, and are not described herein again.

The display panel 40 may further include a lower polarizer 403 and an upper polarizer 405, in the embodiment shown in fig. 6A and 6B, the lower polarizer 403 is disposed on the lower surface of the array substrate 401, and the upper polarizer 405 is disposed on the upper surface of the color filter substrate 402.

Referring to fig. 6A and 6B, the middle frame 60 is used for supporting the display panel 40, for example, a buffer element 70 such as buffer foam is disposed between the supporting surface of the middle frame 60 and the lower polarizer 403 of the display panel 40. The back plate 50 has a side wall 502, the side wall of the middle frame 60 is combined with the side wall 502 of the back plate 50 by, for example, a snap connection, and the side wall of the front frame 80 is combined with the side wall of the middle frame 60 by, for example, a screw connection, so that the backlight module 20 and the display panel 40 are combined together to form the display device.

For example, the display device in each of the above-described embodiments may be a vehicle-mounted display device applied to a mobile object such as an automobile, or may be a display device such as a notebook computer. Of course, the embodiments of the present disclosure are not limited thereto, and for example, the display device may be any product or component having a display function, such as a smart phone, a wearable smart watch, smart glasses, a tablet computer, a television, a display, a digital photo frame, a navigator, an in-vehicle display, an electronic book, and the like.

For example, the display device 100 may be a 15 "narrow bezel in-vehicle display device.

Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.

Claims

1. A backlight module includes:

a backsheet, the backsheet comprising:

a base plate;

the first side wall is vertically connected to the bottom plate; and

the accommodating groove is formed in the first side wall;

the light guide plate is arranged on the bottom plate; and

a buffer member disposed between the light guide plate and the first sidewall,

2. The backlight module according to claim 1, wherein the receiving groove has an opening facing the light guide plate.

3. The backlight module according to claim 1 or 2, wherein at least a portion of an end surface of the buffer member facing the light guide plate contacts the light guide plate, and at least a portion of an end surface of the buffer member facing the receiving groove abuts against an inner wall of the receiving groove.

4. The backlight module according to claim 2, wherein the receiving groove penetrates the first sidewall along a first direction, and the first direction is perpendicular to the first sidewall.

5. The backlight module according to claim 1 or 2, wherein the buffer comprises a connection structure, and the light guide plate comprises a connection fitting structure, and the connection structure is connected with the connection fitting structure.

6. A backlight module according to claim 5, wherein the connection structure comprises:

a connection arm extending from the buffer toward the light guide plate; and

a connection hole formed in the connection arm,

7. The backlight module according to claim 6, wherein the light guide plate comprises a first surface facing the bottom plate and a second surface away from the bottom plate;

8. The backlight module according to claim 1 or 2, wherein the first cross-section of the receiving groove is trapezoidal, and the first cross-section is perpendicular to both the bottom plate and the first sidewall.

9. The backlight module according to claim 8, wherein the trapezoid has a first base and a second base parallel to each other, the first base is closer to the light guide plate than the second base, and the length of the first base is greater than that of the second base.

10. The backlight module according to claim 9, wherein the trapezoid further has 2 sides, each of the sides connects the first bottom side and the second bottom side, and at least a portion of the buffer abuts against the 2 sides.

11. A backlight module according to claim 10, wherein the buffer has a chamfer on an end surface facing the receiving groove, and a portion of the buffer having the chamfer abuts against the 2 sides.

12. A backlight module according to any one of claims 1, 2, 6, 7 and 9-11, wherein the buffer comprises an elastomeric material.

13. The backlight module according to any one of claims 1, 2, 6, 7 and 9-11, wherein the light guide plate comprises a first sidewall for introducing light and a second sidewall respectively positioned at opposite sides of the light guide plate;

14. The backlight module according to any one of claims 1, 2, 6, 7 and 9-11, wherein the back plate further comprises a second sidewall and a third sidewall, and the second sidewall and the third sidewall are both vertically connected to the bottom plate;

15. A display device comprising a backlight module according to any one of claims 1-14.