CN112305812B

CN112305812B - Backlight module and display device

Info

Publication number: CN112305812B
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: 2025-03-07
Anticipated expiration: 2039-07-31
Also published as: CN112305812A

Abstract

A backlight module and a display device are provided. The backlight module comprises: a back plate, the back plate comprises: a bottom plate; a first side wall, the first side wall is vertically connected to the bottom plate; and a receiving groove, the receiving groove is formed in the first side wall; a light guide plate, the light guide plate is arranged on the bottom plate; and a buffer, the buffer is arranged between the light guide plate and the first side wall, and at least a part of the buffer is located in the receiving groove.

Description

Backlight module and display device

Technical Field

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

Background

In recent years, liquid crystal display devices have been widely used. The present lcd device generally includes a backlight module and a display panel, and the display panel of the lcd device does not emit light, so that the function of displaying images is realized by light provided by the backlight module. Moreover, with the continuous progress of technology, various types of display devices including liquid crystal display devices are being developed toward large-sized and narrow-frame sides.

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

Disclosure of Invention

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

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

A back plate, the back plate comprising:

A bottom plate;

A first side wall vertically connected to the bottom plate, and

The accommodating groove is formed in the first side wall;

a light guide plate disposed on the base plate, and

The buffer piece is arranged between the light guide plate and the first side wall,

Wherein at least a portion of the cushioning member is positioned in the receiving groove.

For example, the receiving groove has an opening toward 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 accommodation groove abuts against an inner wall of the accommodation 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 connecting arm extending from the buffer member 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 bottom plate and a second surface remote from the bottom 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 away from the light guide plate, the second connecting arm is positioned on one side of the second surface, which is 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 protruding portion includes a first protruding portion protruding from the first surface of the light guide plate toward the connection hole in the first connection arm, and a second protruding portion protruding from the second surface of the light guide plate toward the connection hole in the second connection arm.

For example, the first cross section of the receiving groove is trapezoidal, the first cross section being 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 being closer to the light guide plate than the second base, the first base having a length greater than a length of the second base.

For example, the trapezoid further has 2 sides, each of the sides connecting the first base and the second base, at least a portion of the cushioning member being abutted against the 2 sides.

For example, the buffer member has a chamfer on an end face facing the accommodation groove, and a portion of the buffer member having the chamfer abuts against the 2 sides.

For example, the cushioning member comprises an elastic material.

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

And wherein the first side wall and the second side wall are arranged oppositely, and the buffer member is arranged between the second side wall and the first side wall of the light guide plate.

For example, the back plate further comprises a second side wall and a third side wall, and 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, wherein 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 respectively connected with the first side wall and the second side wall;

the first side wall is arranged opposite to the second side wall, the second side wall is arranged opposite to the third side wall, and the third side wall is arranged opposite to the fourth side wall;

the backlight module comprises 3 buffer pieces, wherein each of the second side wall and the third side wall is also provided with an accommodating groove, and the 3 buffer pieces are respectively arranged between the second side wall and the first side wall of the light guide plate, between the third side wall and the second side wall of the light guide plate and between the fourth side wall and the third side wall of the light guide plate.

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

By the embodiment of the disclosure, the buffer member can be extruded by the light guide plate so as to be capable of moving into the accommodating groove to adapt to the technical development direction of a large size and a narrow frame.

Drawings

Other objects and advantages of the present invention will become apparent from the following description of the invention with reference to the accompanying drawings, which provide a thorough understanding of the present invention.

Fig. 1A and 1B are partial structural schematic 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 present disclosure, taken along line AA' in fig. 2;

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

FIG. 4 is a partially exploded view of the backlight module 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 portion I of 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 the dimensions of layers, structures or regions may be exaggerated or reduced in the figures for describing embodiments of the present invention for clarity, i.e., the figures are not drawn to actual scale.

Detailed Description

For the purpose of making 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 clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.

Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items.

In this document, unless specifically stated otherwise, directional terms such as "upper," "lower," "left," "right," "inner," "outer," and the like are used to denote orientations or positional relationships shown based on the drawings, and are merely used to facilitate the description of the present disclosure, rather than to indicate or imply that the devices, elements, or components referred to must have a particular orientation, be configured or operated in a particular orientation. It should be understood that when the absolute positions of the described objects are changed, the relative positional relationship they represent may also be changed accordingly. Accordingly, these directional terms should not be construed to limit the present disclosure.

Herein, for convenience of description, a light emitting direction of the backlight module is defined as an X direction, a direction perpendicular to a sidewall of the light guide plate into which 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 "vertical", "vertical connection" or similar expressions include not only the case of 90 degrees, i.e. the case of complete vertical, but also the case of a certain error range from 90 degrees, e.g. the case of a process error range from 90 degrees.

Fig. 1A and 1B are partial structural schematic views 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 module 2, a display panel 4, a middle frame 6, and a front frame 8.

Specifically, the backlight module 2 may include a back plate 5, a light source 21, a light guide plate 22, and an optical film set. Optionally, the backlight module 2 may further include a reflective sheet 25 between the back plate 5 and the light guide plate 22.

The back plate 5 may be used to support and fix the light guide plate 22 and the optical film group, 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 group.

For example, the optical film group may include optical films such as the diffusion film 23 and the light enhancement film 24, and it should be understood that the optical film group may also include other types of optical films, and the types of the optical films included in the optical film group 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 backlight module. Referring to fig. 1B, the light source 21 may be disposed at one side 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 located at opposite sides of the light guide plate 22, respectively. 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 such that light from the light source 21 can enter the inside of the light guide plate 22 through the first sidewall 221. In this way, the light emitted from the light source 21 is scattered by the light guide plate 22, and then emitted from the 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, the display panel 4, for example, a liquid crystal display panel, may include two substrates disposed opposite to each other, for example, the two substrates may be an array substrate 41 and a color film 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 film substrate 42. The substrates of the array substrate 41 and the color film substrate 42 may be glass substrates. In addition, it should be noted that the array substrate and the color film substrate may adopt structures of an array substrate and a color film substrate that are common in the art, and will not be described herein.

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 film substrate 42.

Referring to fig. 1A and 1B, the middle frame 6 is used to carry the display panel 4, for example, a buffer member 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. The back plate 5 has a side wall 52, and the side wall of the middle frame 6 is coupled to the side wall 52 of the back plate 5 by, for example, fastening, and the side wall of the front frame 8 is coupled to the side wall of the middle frame 6 by, for example, fastening or fastening, so that the backlight module 2 and the display panel 4 are coupled together to form a display device.

As shown in fig. 1A, the backlight module 2 may further include a buffer member 9, where the buffer member 9 is disposed between the side wall 52 of the back plate 5 and the second side wall 222 of the light guide plate 22 and is capable of at least partially elastically deforming. 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 side wall 52 of the back plate 5 and the second side wall 222 of the light guide plate 22, so that the buffer member 9 does not interfere with the light path of the light emitted from the light source 21, and thus does not affect the normal propagation of the light.

In this way, the light guide plate 22 is assembled to the back plate 5 against the buffer member 9, so that the light guide plate 22 can be prevented from shaking, and defects such as abnormal sound and scratch on the optical film 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 of long-time operation of the display device, the light guide plate 22 may be thermally expanded, and at this time, the buffer member 9 may be elastically deformed under the compression of the light guide plate 22, for example, the buffer member 9 may be compressed to compensate for the thermal expansion of the light guide plate 22. Thus, the light guide plate 22 is not deformed and arched by the rigid pressing force, and poor display caused by the deformed and arched light guide plate is avoided.

In the embodiment of the present disclosure, the buffer member 9 may be elastically deformed under the pressing of the light guide plate 22, for example, the compression amount of the buffer member 9 may be as high as 50%. Specifically, referring to fig. 1A, the size of the buffer member 9 in the Y direction (shown as a width in fig. 1A) is denoted as a, and the maximum compression amount of the buffer member 9 in the Y direction may be 50% by a under the pressing action of the light guide plate 22, that is, the size of the buffer member 9 in the Y direction may be compressed to 0.5a. For example, in a normal temperature state, referring to fig. 1A, the buffer member 9 is not pressed by the light guide plate 22, the size a of the buffer member 9 in the Y direction may be 2 to 4mm, the thermal expansion amount of the light guide plate 22 is less than or equal to 0.8mm, and the thermal expansion amount of the light guide plate 22 is less than the maximum compression amount of the buffer member 9 in the Y direction by 50% a (equal to 1 to 2 mm), so the compression amount of the buffer member 9 may compensate the thermal expansion amount of the light guide plate 22, thereby ensuring that the light guide plate 22 is not deformed and arched due to the rigid pressing force, and ensuring that the buffer member 9 may firmly clamp the light guide plate 22. That is, the buffer member 9 can secure 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 developing toward large-sized and narrow-frame display devices, and meanwhile, display devices using GOA and other technologies are widely applied, so that narrow-frame display devices are becoming more common. That is, on the one hand, as the size of the display device is increased, the size of the light guide plate included therein is increased, resulting in an increase in the amount of thermal expansion of the light guide plate, and on the other hand, in the narrow-frame display device, the space available for accommodating and positioning the above-mentioned buffer member is reduced, resulting in a reduction in the size a of the buffer member, and accordingly, a reduction in the maximum compression amount of the buffer member. As a result, there may be a case where the maximum compression amount of the buffer member is smaller than the thermal expansion amount of the light guide plate. For example, in a 15-inch narrow-frame vehicle-mounted display device, the size a of the buffer member is generally 0.8-1 mm, and the thermal expansion of the light guide plate is generally more than 1 mm. At this time, the compression amount of the buffer member may not be enough to compensate for the thermal expansion amount of the light guide plate.

In view of the foregoing, embodiments of the present disclosure further provide a backlight module and a display device including the backlight module.

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 the backlight module according to an embodiment of the present disclosure taken along line AA 'in fig. 2, and fig. 3B is a partial cross-sectional view of the backlight module according to an embodiment of the present disclosure taken along line BB' in fig. 2. Referring to fig. 2, 3A and 3B in combination, the backlight module 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 used to support and fix the light guide plate 202 and the optical film group, and the back plate 50 may include a bottom plate 501 and side walls 502, 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 group. Referring to fig. 2, for convenience of description, the left side wall 502 of the back plate 50 may be referred to as a first side wall, the upper side wall 502 of the back plate 50 may be referred to as a second side wall, the lower side wall 502 of the back plate 50 may be referred to as a third side wall, and the right side wall 502 of the back plate 50 may be referred to as a fourth side wall.

For example, the optical film group may include optical films such as the diffusion film 203 and the light enhancement film 204, and it should be understood that the optical film group may also include other types of optical films, and the types of the optical films included in the optical film group 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 backlight module. Referring to fig. 3B, the light source 201 may be disposed at one side 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) not for introducing light, and the first sidewall 2021 and the second sidewall 2022 are respectively located at opposite sides of the light guide plate 202. For example, the light guide plate 202 may have a rectangular shape, that is, the light guide plate 202 may have a third sidewall 2023 and a fourth sidewall 2025 in addition to the first sidewall 2021 and the second sidewall 2022 described above, and the third sidewall 2023 and the fourth sidewall 2025 each connect the first sidewall 2021 and the second sidewall 2022. The light source 201 is disposed opposite to the first sidewall 2021 of the light guide plate 202 such that light from the light source 201 can enter the inside of the light guide plate 202 through the first sidewall 2021. In this way, the light emitted from the light source 201 is scattered by the light guide plate 202, and then emitted from the light exit surface of the light guide plate 202 (in fig. 3B, the upper surface of the light guide plate 202 is the light exit 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 member 90, where the buffer member 90 is disposed between the side wall 502 of the back plate 50 and the second side wall 2022 of the light guide plate 202, and is capable of being at least partially elastically deformed. For example, the buffer 90 may be made of an elastic material such as rubber or silicone. The buffer member 90 is disposed between the side wall 502 of the back plate 50 and the second side wall 2022 of the light guide plate 202, so that the buffer member 90 does not interfere with the light path of the light emitted from the light source 201, and thus normal propagation of the light is not affected.

With continued reference to fig. 3A, the back plate 50 also includes a receiving slot 503 formed in its side wall 502. The buffer member 90 is disposed between the light guide plate 202 and the receiving groove 503, and the receiving groove 503 is configured to press the buffer member 90 in response to the light guide plate 202 pressing the buffer member 90, for example, the light guide plate 202 thermally expanding in a high temperature state, the buffer member 90 being movable 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 accommodation groove 503 has an opening 505 toward the light guide plate 202, and a projection of the buffer member 90 in the Y direction falls into the opening 505 of the accommodation groove 503. Thus, during high temperature and high humidity testing of the display device, and in the case where the display device is operated for a long period of time, the light guide plate 202 is thermally expanded, at this time, the buffer member 90 moves toward the receiving groove 503 under the pressing of the light guide plate 202 and enters the receiving groove 503, and the buffer member 90 itself may be elastically deformed, that is, the buffer member 90 may be compressed. That is, the thermal expansion amount of the light guide plate 202 may be compensated by the sum of the moving amount of the buffer member 90 and the compression amount of the buffer member 90 itself. So that the light guide plate 202 is not deformed and arched due to the rigid extrusion force, and poor display caused by the deformed and arched light guide plate is avoided. In addition, the accommodating groove 503 is beneficial to increasing the thickness of the buffer member 90, and accordingly, the compression amount of the buffer member, thereby further improving the high temperature and vibration reliability of the large-sized or narrow-frame display device.

For example, the receiving groove 503 may penetrate the side wall 502 of the back plate 50 in the Y direction so that the moving amount of the buffer member 90 may be maximized.

Alternatively, the accommodating groove 503 may not penetrate the side wall 502 of the back plate 50 in the Y direction, as long as the sum of the maximum movement amount of the buffer member 90 and the maximum compression amount of the buffer member 90 itself can compensate the thermal expansion amount of the light guide plate 202.

It should be noted that, herein, the buffer member 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 member is disposed between the light guide plate and the side wall of the back plate, for example, a portion of the buffer member is completely disposed between the light guide plate and the side wall of the back plate, and another portion of the buffer member is disposed in the receiving groove of the side wall, which may also be described as being disposed between the light guide plate and the side wall of the back plate.

Fig. 4 is a partially exploded view of the backlight module 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 member 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 side wall 502. The trapezoid has a first bottom side 5031, a second bottom side 5032, and 2 side edges 5033, 5034, the first bottom side 5031 and the second bottom side 5032 are parallel to each other, each of the 2 side edges 5033, 5034 connects the first bottom side 5031 and the second bottom side 5032, the first bottom side 5031 is closer to the light guide plate 202 than the second bottom side 5032, and the length of the first bottom side 5031 is longer than the length of the second bottom side 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 has an inclination angle of 45 ° with respect to the Y direction. In this case, the length of the first bottom edge 5031 and the length of the second bottom edge 5032 have a relationship that the length of the first bottom edge 5031=the length of the second bottom edge 5032+2×the thickness of the side wall 502 along the Y direction.

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

Referring to fig. 3A, at least a portion of an end surface of the buffer member 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 member 90 facing the accommodating groove 503 abuts against an inner wall of the accommodating groove 503. For example, referring to fig. 4, the buffer member 90 has a chamfer C on an end surface facing the accommodating groove 503, and the chamfer C may be, for example, generally about 0.2mm in size. And, the length of the first base 5031 of the trapezoid is equal to or slightly greater than the dimension (i.e., the height in fig. 4) H of the buffer member 90 in the X direction. In this way, at normal temperature, a part (for example, a portion having a chamfer) of the buffer member 90 is inserted into the accommodation groove 503 and abuts against the inner wall of the accommodation 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 member 90, so that the light guide plate 202 can be prevented from shaking, and adverse effects such as abnormal sound, scratch on the optical film and the like caused by shaking of the light guide plate 202 can be avoided.

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

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

Illustratively, at normal temperature, the light guide plate 202 does not compress the buffer member 90, the size a of the buffer member 90 in the Y direction may be 0.8mm, and the thermal expansion amount 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 where the receiving groove 503 penetrates the side wall 502 of the back plate 50 in the Y direction, the depth of the receiving groove 503 in the Y direction is 1.5mm, so the maximum movement amount of the buffer member 90 may be 1.5mm. In this case, the sum of the maximum movement amount of the buffer member 90 and the maximum compression amount of the buffer member 90 itself is equal to 1.9mm, which is greater than the maximum value (1.5 mm) of the thermal expansion amount of the light guide plate 202. That is, the sum of the moving amount of the buffer member 90 and the compression amount of the buffer member 90 itself can compensate for the thermal expansion amount of the light guide plate 22, so that it can be ensured that the light guide plate 202 is not deformed to arch due to the rigid pressing force, while ensuring that the buffer member 90 can firmly clamp the light guide plate 202. That is, the buffer member 90 may not affect the free expansion of the light guide plate 202 at high temperature while securing the positioning of the light guide plate 202.

Alternatively, the thickness of the back plate may be any value within a range of 0.5 to 1.5mm, for example, 0.5mm,0.8mm,1mm,1.2mm, etc., and the thermal expansion of the light guide plate 202 may be 1.2mm or less. It should be understood that the above-described values are merely exemplary and should not be construed as limiting the embodiments of the present disclosure.

The buffer member 90 may further include a connection structure, and the light guide plate 202 may further include a connection fitting structure, to which the connection fitting structure may be connected, in such a manner that the buffer member 90 and the light guide plate 202 may be connected. Thus, in the case of changing from the high temperature state to the normal temperature state, the light guide plate 202 may pull the buffer member 90 to move toward the light guide plate, that is, pull back the buffer member 90, so as to ensure that the light guide plate 202 may be abutted against the side wall of the back plate 50 through the buffer member 90 all the time, thereby realizing the effect of continuously positioning and fixing the light guide plate.

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 connection arms 902 spaced apart in the X-direction, and 1 connection hole 904 is provided in each of the connection arms 902. The connection fitting structure includes a boss 2024 that protrudes from the light guide plate 202. In the embodiment shown in fig. 4, the light guide plate 202 includes 2 protrusions 2024 protruding from the upper and lower surfaces of the light guide plate, respectively. The 2 protrusions 2024 are respectively inserted into the connection holes 904 of the 2 connection arms 902. Specifically, the light guide plate 202 includes a first surface (i.e., a lower surface in fig. 4) facing the bottom plate 501 and a second surface (i.e., an upper surface in fig. 4) distant from the bottom plate 501. The connection arms comprise a first connection arm 902 (i.e. a lower connection arm in fig. 4) and a second connection arm 902 (i.e. an upper connection arm in fig. 4), the lower connection arm 902 being located on a side of the lower surface facing away from the light guide plate 202, the upper connection arm 902 being located on a side of the upper surface facing away from the light guide plate 202, the lower connection arm 902 and the upper connection arm 902 each being 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 a lower surface of the light guide plate 202 toward the connection hole 904 in the lower connection arm, the upper protrusion 2024 protruding from an 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 member 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 present disclosure, and fig. 5B is an enlarged view of a portion I in fig. 5A. Referring to fig. 5A and 5B, the coupling structure may include a T-shaped coupling groove 906 formed in the buffer member 90. The connection mating structure may include a T-shaped boss 2026 that protrudes in a direction. The T-shaped protrusion 2026 is inserted into the T-shaped connection groove 906, in this way, connection of the buffer member 90 with the light guide plate 202 can be achieved.

Referring to fig. 2, 3A and 3B in combination, the backlight module may include 3 buffers 90 and 3 receiving grooves 503. As shown in fig. 2, the fourth side wall 502 of the back plate 50 is opposite to the first side wall 2021 of the light guide plate 202, and the 3 side walls (i.e., the first side wall, the second side wall, and the third side wall) are respectively provided with the accommodating groove 503 except for the fourth side wall 502. Accordingly, 3 buffers 90 are respectively disposed between the 3 side walls and the corresponding side walls of the light guide plate 202. Specifically, the 3 buffering members 90 are disposed between the second sidewall 2022 of the light guide plate 202 and the first sidewall (i.e. the left sidewall) of the back plate 50, 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 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, respectively. By such arrangement, the buffer member 90 does not interfere with the optical path of the light emitted from the light source 201, so that normal propagation of the light is not affected, and by providing 3 buffer members, the function of supporting and positioning the light guide plate can be better played.

Alternatively, the positions of the buffer member 90 located between the third side wall 2023 of the light guide plate 202 and the second side wall (i.e., the upper side wall) of the back plate 50 and the buffer member 90 located between the fourth side wall 2025 of the light guide plate 202 and the third side wall (i.e., the lower side wall) of the back plate 50 may correspond, and in particular, an orthographic projection (i.e., a projection in the Z direction) of the buffer member 90 located between the third side wall 2023 of the light guide plate 202 and the second side wall (i.e., the upper side wall) of the back plate 50 on the third side wall (i.e., the lower side wall) and an orthographic projection (i.e., a projection in the Z direction) of the buffer member 90 located between the fourth side wall 2025 of the light guide plate 202 and the third side wall (i.e., the lower side wall) of the back plate 50 may coincide. Thus, the two buffers 90 can apply force to the light guide plate 202 from the upper side and the lower side respectively, so that 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 module 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 disposed opposite to each other, for example, the two substrates may be an array substrate 401 and a color film substrate 402, respectively. 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 film substrate 402. The substrates of the array substrate 401 and the color film substrate 402 may be glass substrates. In addition, it should be noted that the array substrate and the color film substrate may adopt structures of an array substrate and a color film substrate that are common in the art, and will not be described herein.

The display panel 40 may further include a lower polarizer 403 and an upper polarizer 405, and 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 film substrate 402.

Referring to fig. 6A and 6B, the middle frame 60 is used for carrying the display panel 40, for example, a buffer member 70 such as buffer foam is disposed between a carrying surface of the middle frame 60 and a lower polarizer 403 of the display panel 40. The back plate 50 has a side wall 502, and the side wall of the middle frame 60 is coupled to the side wall 502 of the back plate 50 by, for example, fastening, and the side wall of the front frame 80 is coupled to the side wall of the middle frame 60 by, for example, fastening, in such a manner that the backlight module 20 and the display panel 40 are coupled together to form a display device.

For example, the display device in the above-described embodiments may be a vehicle-mounted display device applied to a moving 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 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, a vehicle-mounted display, an electronic book, and the like, for example.

For example, the display device 100 may be a 15-inch 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, comprising:

A back plate, the back plate comprising:

Base plate;

A first side wall, the first side wall being vertically connected to the bottom plate; and

a receiving groove, wherein the receiving groove is formed in the first side wall;

a light guide plate, the light guide plate being disposed on the bottom plate; and

a buffer member, the buffer member being arranged between the light guide plate and the first side wall,

Wherein, at least a portion of the buffer member is located in the receiving groove;

The buffer member includes a connection structure, the light guide plate includes a connection matching structure, and the connection structure is connected to the connection matching structure;

The connection structure comprises:

A connecting arm extending from the buffer member toward the light guide plate; and

a connecting hole formed in the connecting arm,

And wherein, the connection matching structure comprises a protrusion protruding from the light guide plate toward the connection hole, and the protrusion is suitable for being inserted into the connection hole;

The light guide plate comprises a first surface facing the bottom plate and a second surface away from the bottom plate;

The connecting arm comprises a first connecting arm and a second connecting arm, the first connecting arm is located on a side of the first surface away from the light guide plate, the second connecting arm is located on a side of the second surface away from the light guide plate, and each of the first connecting arm and the second connecting arm is formed with the connecting hole;

The protrusion includes a first protrusion and a second protrusion, the first protrusion protrudes from the first surface of the light guide plate toward the connection hole in the first connection arm, and the second protrusion protrudes from the second surface of the light guide plate toward the connection hole in the second connection arm;

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.

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 2 , wherein the accommodating groove penetrates the first side wall along a first direction, and the first direction is perpendicular to the first side wall.

4 . The backlight module according to claim 1 , wherein 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.

5 . The backlight module according to claim 4 , wherein the trapezoid has a first bottom side and a second bottom side parallel to each other, the first bottom side is closer to the light guide plate than the second bottom side, and the length of the first bottom side is greater than the length of the second bottom side.

6 . The backlight module according to claim 5 , wherein the trapezoid further has two 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 two side edges.

7 . The backlight module according to claim 6 , wherein the buffer member has a chamfer on an end surface facing the accommodating groove, and a portion of the buffer member having the chamfer abuts against the two side edges.

8. The backlight module according to any one of claims 1, 2 and 5-7, wherein the buffer comprises an elastic material.

9. The backlight module according to any one of claims 1, 2 and 5-7, wherein the light guide plate comprises a first side wall and a second side wall, the first side wall is used to introduce light, and the second side wall and the first side wall are respectively located on two opposite sides of the light guide plate;

And wherein the first side wall is arranged opposite to the second side wall, and the buffer is arranged between the second side wall of the light guide plate and the first side wall.

10. The backlight module according to any one of claims 1, 2 and 5-7, wherein the back plate further comprises a second side wall and a third side wall, and the second side wall and the third side wall are both 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 to introduce light, the second side wall and the first side wall are respectively located on two opposite sides of the light guide plate, and the third side wall and the fourth side wall both connect the first side wall and the second side wall;

The backlight module includes three buffer members, and each of the second side wall and the third side wall is also formed with the accommodating groove. The three buffer members are respectively arranged between the second side wall of the light guide plate and the first side wall, between the third side wall of the light guide plate and the second side wall, and between the fourth side wall of the light guide plate and the third side wall.

11. A display device comprising the backlight module according to any one of claims 1 to 10.