Backlight module and display device

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

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] In recent years, liquid crystal display devices have been widely used. Current liquid crystal display devices generally include a backlight module and a display panel. The display panel of the liquid crystal display device does not emit light itself, and uses the light provided by the backlight module to realize the function of displaying images. Moreover, with the continuous advancement of technology, various display devices including liquid crystal display devices are developing in the direction of large size and narrow frame.

[0003] Therefore, how to design the structure of the backlight module to adapt to the technical development direction of large size and narrow frame is gradually becoming one of the important issues faced by technical personnel in this field. Summary of the invention

[0004] 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.

[0005] According to one aspect, a backlight module is provided, comprising:

[0006] A back plate, the back plate comprising:

[0007] Base plate;

[0008] A first side wall, the first side wall being vertically connected to the bottom plate; and

[0009] a receiving groove, the receiving groove being formed in the first side wall;

[0010] a light guide plate, the light guide plate being disposed on the bottom plate; and

[0011] a buffer member, the buffer member being arranged between the light guide plate and the first side wall,

[0012] Wherein, at least a portion of the buffer member is located in the accommodating groove.

[0013] For example, the receiving groove has an opening facing the light guide plate.

[0014] For example, at least a portion of the end surface of the buffer member facing the light guide plate contacts the light guide plate, and at least a portion of the end surface of the buffer member facing the receiving groove abuts against an inner wall of the receiving groove.

[0015] For example, the accommodating groove penetrates the first side wall along a first direction, and the first direction is perpendicular to the first side wall.

[0016] For example, 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.

[0017] For example, the connection structure includes:

[0018] A connecting arm extending from the buffer member toward the light guide plate; and

[0019] a connecting hole formed in the connecting arm,

[0020] And wherein, the connection and matching structure includes a protrusion protruding from the light guide plate toward the connection hole, and the protrusion is suitable for being inserted into the connection hole.

[0021] For example, the light guide plate includes a first surface facing the bottom plate and a second surface away from the bottom plate;

[0022] 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;

[0023] 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 connecting hole in the first connecting arm. The second protrusion protrudes from the second surface of the light guide plate toward the connecting hole in the second connecting arm.

[0024] For example, 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 side wall.

[0025] For example, the trapezoid has a first bottom side and a second bottom side that are 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.

[0026] For example, the trapezoid further has two side edges, each of which 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.

[0027] For example, the buffer member has a chamfer on the end surface facing the accommodating groove, and the portion of the buffer member having the chamfer abuts against the two side edges.

[0028] For example, the buffer element comprises an elastic material.

[0029] For example, the light guide plate includes 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;

[0030] And wherein the first side wall is arranged opposite to the second side wall, and the buffer component is arranged between the second side wall of the light guide plate and the first side wall.

[0031] For example, the back plate further includes 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;

[0032] 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 are both connected to the first side wall and the second side wall;

[0033] 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;

[0034] The backlight module includes three buffer members, and the accommodating groove is also formed in each of the second side wall and the third side wall. 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.

[0035] According to another aspect, a display device is provided, comprising the backlight module as described above.

[0036] Through the embodiments of the present disclosure, the buffer can be moved into the receiving groove in response to the light guide plate squeezing the buffer to adapt to the technical development direction of large size and narrow frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Other objects and advantages of the present invention will become apparent from the following description of the present invention with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present invention.

[0038] Figure 1A and Figure 1B is a partial structural schematic diagram of a display device according to an embodiment of the present disclosure;

[0039] Figure 2 is a plan view of a backlight module according to an embodiment of the present disclosure;

[0040] Figure 3A The backlight module according to the embodiment of the present disclosure is Figure 2 A partial cross-sectional view taken along line AA';

[0041] Figure 3BThe backlight module according to the embodiment of the present disclosure is Figure 2 A partial cross-sectional view taken along line BB';

[0042] Figure 4 yes Figure 3A A partial exploded view of the backlight module shown;

[0043] Figure 5A is a plan view of a backlight module according to an embodiment of the present disclosure;

[0044] Figure 5B yes Figure 5A an enlarged view of portion I in FIG. 1 ; and

[0045] Fig. 6A and Figure 6B They are respectively partial cross-sectional views of a display device according to an embodiment of the present disclosure.

[0046] It should be noted that, for the sake of clarity, in the drawings used to describe the embodiments of the present invention, the sizes of layers, structures or regions may be enlarged or reduced, that is, these drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0048] Unless otherwise defined, the technical terms or scientific terms used in this disclosure should be understood by ordinary technicians in the field. "First", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0049] In this document, unless otherwise specified, directional terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the present disclosure, and do not indicate or imply that the device, element or component referred to must have a specific orientation, be constructed or operate in a specific orientation. It should be understood that when the absolute position of the described object changes, the relative positional relationship they represent may also change accordingly. Therefore, these directional terms should not be understood as limiting the present disclosure.

[0050] In this article, for the convenience of description, the light emitting direction of the backlight module is defined as the X direction, the direction perpendicular to the side wall of the light guide plate for introducing light is defined as the Y direction, and the direction perpendicular to both the X direction and the Y direction is defined as the Z direction.

[0051] In this article, the expressions "vertical", "vertically connected" or similar expressions include not only the case of 90 degrees, that is, the completely vertical case, but also the case where the difference from 90 degrees is within a certain error range, for example, the case where the difference from 90 degrees is within the process error range.

[0052] Figure 1A and Figure 1B is a partial structural diagram of a display device according to an embodiment of the present disclosure. For example, Figure 1A and Figure 1B The display device shown in FIG. 1 may be a liquid crystal display device. Figure 1A and Figure 1B The display device 1 may include a backlight module 2 , a display panel 4 , a middle frame 6 and a front frame 8 .

[0053] Specifically, the backlight module 2 may include a back plate 5 , a light source 21 , a light guide plate 22 , and an optical film group. Optionally, the backlight module 2 may further include a reflective sheet 25 located between the back plate 5 and the light guide plate 22 .

[0054] The back panel 5 can be used to support and fix the light guide plate 22 and the optical film group, etc. The back panel 5 may include a bottom plate 51 and side walls 52. The bottom plate 51 may have a rectangular shape. The four side walls 52 are vertically connected to the four sides of the bottom plate 51 to form a receiving cavity 54 for accommodating the light guide plate 22 and the optical film group and other structures.

[0055] For example, the optical film group may include optical films such as a diffuser 23 and a brightness enhancement film 24. It should be understood that the optical film group may also include other types of optical films, and the type of optical films included in the optical film group may be selected according to actual use requirements.

[0056] For example, the light source 21 may include a plurality of light emitting diodes (LEDs).

[0057] For example, the backlight module 2 may be an edge-type backlight module. Figure 1B The light source 21 can be disposed on a side surface of the light guide plate 22, and the side surface of the light guide plate is called the light incident surface of the light guide plate 22. That is, the light guide plate 22 has a first side wall 221 (eg, Figure 1B ) and a second side wall 222 not used for introducing light (as shown Figure 1AAs shown in the figure, the first side wall 221 and the second side wall 222 are respectively located on opposite sides of the light guide plate 22. For example, the light guide plate 22 can have a rectangular shape, and the light guide plate 22 can have a first side wall 221, a second side wall 222, and a third side wall and a fourth side wall connecting the first side wall and the second side wall. The light source 21 is arranged to be opposite to the first side wall 221 of the light guide plate 22, so that the light from the light source 21 can enter the interior of the light guide plate 22 through the first side wall 221. In this way, the light emitted by the light source 21 is scattered by the light guide plate 22 and then emitted from the light exit surface (at the light exit surface) of the light guide plate 22. Figure 1B In the embodiment, the upper surface of the light guide plate 22 is the light emitting surface) and then passes through the optical film group to form a surface light source.

[0058] Reference Figure 1A and Figure 1B For example, the display panel 4 of the liquid crystal display panel may include two substrates arranged opposite to each other, for example, the two substrates may be an array substrate 41 and a color filter substrate 42. It should be understood that the display panel 4 may also include a liquid crystal layer arranged 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 structures of the array substrate and the color filter substrate commonly used in the art, which will not be described in detail here.

[0059] The display panel 4 may further include a lower polarizer 43 and an upper polarizer 45. Figure 1A and Figure 1B In the illustrated embodiment, 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 .

[0060] Reference Figure 1A and Figure 1B The middle frame 6 is used to carry the display panel 4. For example, a buffer element 7 such as a buffer foam is provided between the 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. The side wall of the middle frame 6 is combined with the side wall 52 of the back plate 5 by, for example, a snap connection. The side wall of the front frame 8 is combined with the side wall of the middle frame 6 by, for example, a threaded connection or a snap connection. In this way, the backlight module 2 and the display panel 4 are combined together to form a display device.

[0061] like Figure 1AAs shown, the backlight module 2 may further include a buffer 9, which 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 can be elastically deformed at least partially. For example, the buffer 9 may be made of an elastic material such as rubber or silicone. The buffer 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 9 does not obstruct the optical path of the light emitted by the light source 21, thereby not affecting the normal propagation of the light.

[0062] In this way, the light guide plate 22 is assembled to the back plate 5 in a manner of abutting against the buffer 9, which can prevent the light guide plate 22 from shaking, thereby preventing abnormal noise, scratching of the optical film, and other defects caused by the shaking of the light guide plate 22. Furthermore, during the high temperature and high humidity test of the display device, and when the display device works for a long time, the light guide plate 22 will expand due to heat. At this time, the buffer 9 can produce elastic deformation under the extrusion of the light guide plate 22, for example, the buffer 9 can be compressed to compensate for the thermal expansion of the light guide plate 22. In this way, the light guide plate 22 will not be deformed and arched due to the rigid extrusion force, avoiding display defects caused by the deformation and arching of the light guide plate.

[0063] In the embodiment of the present disclosure, the buffer member 9 can be elastically deformed under the pressure of the light guide plate 22. For example, the compression amount of the buffer member 9 can be as high as 50%. Figure 1A , the size of the buffer 9 in the Y direction (in Figure 1A The width is shown in the figure) and is marked as a. Under the extrusion of the light guide plate 22, the maximum compression amount of the buffer 9 in the Y direction can be 50%*a, that is, the size of the buffer 9 in the Y direction can be compressed to 0.5a. For example, at room temperature, refer to Figure 1A , the buffer 9 is not squeezed by the light guide plate 22, the size a of the buffer 9 in the Y direction can be 2-4 mm, the thermal expansion of the light guide plate 22 is less than or equal to 0.8 mm, and the thermal expansion of the light guide plate 22 is less than the maximum compression of the buffer 9 in the Y direction 50%*a (equal to 1-2 mm), so the compression of the buffer 9 can compensate for the thermal expansion of the light guide plate 22, thereby ensuring that the light guide plate 22 will not be deformed and arched due to the rigid squeezing force, and at the same time ensuring that the buffer 9 can firmly clamp the light guide plate 22. In other words, the buffer 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.

[0064] With the continuous advancement of technology, various display devices including liquid crystal display devices are developing in the direction of large size and narrow frame; at the same time, display devices using technologies such as GOA have been widely used, making narrow frame display devices more and more common. That is to say, on the one hand, as the size of the display device continues to increase, the size of the light guide plate included therein also continues to increase, resulting in an increase in the thermal expansion of the light guide plate; on the other hand, in the narrow frame display device, the space available for accommodating and positioning the above-mentioned buffer is reduced, resulting in a reduction in the size a of the buffer, and accordingly, the maximum compression of the buffer is also reduced. As a result, the maximum compression of the buffer may be less than the thermal expansion of the light guide plate. For example, in a 15-inch narrow frame vehicle-mounted display device, the size a of the buffer is generally 0.8 to 1 mm, while the thermal expansion of the light guide plate is generally above 1 mm. At this time, the compression of the buffer may not be sufficient to compensate for the thermal expansion of the light guide plate.

[0065] In view of the above situation, an embodiment of the present disclosure further provides a backlight module and a display device including the backlight module.

[0066] Figure 2 is a plan view of a backlight module according to an embodiment of the present disclosure, Figure 3A The backlight module according to the embodiment of the present disclosure is Figure 2 A partial cross-sectional view taken along line AA' in FIG. Figure 3B The backlight module according to the embodiment of the present disclosure is Figure 2 A partial cross-sectional view taken along line BB' in FIG. Figure 2 , Figure 3A and Figure 3B The backlight module 20 may include a back plate 50, a light source 201, a light guide plate 202 and an optical film group.

[0067] The back plate 50 can be used to support and fix the light guide plate 202 and the optical film group, etc. The back plate 50 may include a bottom plate 501 and side walls 502. The bottom plate 501 may have a rectangular shape. The four side walls 502 are vertically connected to the four sides of the bottom plate 501 to form a receiving cavity 504 for receiving the light guide plate 202 and the optical film group and other structures. Figure 2 For the sake of ease of description, the left side wall 502 of the back plate 50 can be called a first side wall, the upper side wall 502 of the back plate 50 can be called a second side wall, the lower side wall 502 of the back plate 50 can be called a third side wall, and the right side wall 502 of the back plate 50 can be called a fourth side wall.

[0068] For example, the optical film group may include optical films such as a diffuser 203 and a brightness enhancement film 204. It should be understood that the optical film group may also include other types of optical films, and the type of optical films included in the optical film group may be selected according to actual use requirements.

[0069] For example, the light source 201 may include a plurality of light emitting diodes (LEDs).

[0070] For example, the backlight module 20 may be an edge-type backlight module. Figure 3B The light source 201 can be disposed on a side surface of the light guide plate 202, and the side surface of the light guide plate is called the light incident surface of the light guide plate 202. That is, the light guide plate 202 has a first side wall 2021 (eg, Figure 3B ) and a second side wall 2022 not used for introducing light (as shown Figure 3A As shown in the figure), the first side wall 2021 and the second side wall 2022 are respectively located on 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-mentioned first side wall 2021 and the second side wall 2022, the light guide plate 202 may also have a third side wall 2023 and a fourth side wall 2025, and the third side wall 2023 and the fourth side wall 2025 are both connected to the first side wall 2021 and the second side wall 2022. The light source 201 is arranged to be opposite to the first side wall 2021 of the light guide plate 202, so that the light from the light source 201 can enter the interior of the light guide plate 202 through the first side wall 2021. In this way, the light emitted by the light source 201 is scattered by the light guide plate 202 and then emitted from the light exit surface (at the light guide plate 202) of the light guide plate 202. Figure 3B In the embodiment, 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.

[0071] Reference Figure 3A The backlight module 20 may further include a buffer 90, which 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 at least partially elastically deforming. For example, the buffer 90 may be made of an elastic material such as rubber or silicone. The buffer 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 90 does not obstruct the optical path of the light emitted by the light source 201, thereby not affecting the normal propagation of the light.

[0072] Continue to refer to Figure 3A The back plate 50 further includes a receiving groove 503 formed in its side wall 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 move into the receiving groove 503 in response to the light guide plate 202 squeezing the buffer 90, for example, the light guide plate 202 is thermally expanded under a high temperature state to squeeze the buffer 90.

[0073] Reference Figure 3A and Figure 4, the position of the receiving groove 503 corresponds to the position of the buffer 90. More specifically, the receiving groove 503 has an opening 505 facing the light guide plate 202, and the projection of the buffer 90 along 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 when the display device works for a long time, the light guide plate 202 will expand due to heat. At this time, the buffer 90 moves toward the receiving groove 503 under the pressure of the light guide plate 202 and enters the receiving groove 503, and the buffer 90 itself can produce elastic deformation, that is, the buffer 90 can be compressed. In other words, the sum of the movement amount of the buffer 90 and the compression amount of the buffer 90 itself can be used to compensate for the thermal expansion of the light guide plate 202. The light guide plate 202 will not be deformed and arched due to the rigid extrusion force, thereby avoiding poor display caused by the deformation and arching of the light guide plate. In addition, the provision of the receiving groove 503 is conducive to increasing the thickness of the buffer 90, and correspondingly, is conducive to increasing the compression amount of the buffer, thereby further improving the high temperature and vibration reliability of large-size or narrow-frame display devices.

[0074] For example, the receiving groove 503 may penetrate the side wall 502 of the back plate 50 along the Y direction, so that the movement amount of the buffer member 90 can be maximized.

[0075] Optionally, the receiving 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 of the buffer 90 and the maximum compression of the buffer 90 itself can compensate for the thermal expansion of the light guide plate 202 .

[0076] It should be noted that, in this article, the buffer is described as being disposed between the side walls of the light guide plate and the back plate, which means that at least a portion of the buffer is located between the side walls of the light guide plate and the back plate. For example, a portion of the buffer is completely located between the side walls of the light guide plate and the back plate, and the other portion is located in the receiving groove of the side wall. This situation can also be described as the buffer is described as being disposed between the side walls of the light guide plate and the back plate.

[0077] Figure 4 yes Figure 3A The backlight module is shown in the exploded view. Figure 3A and Figure 4 The receiving groove 503 has an opening area that gradually increases toward the light guide plate 202 to facilitate receiving the buffer member 90.

[0078] For example, the first cross section of the receiving groove 503 is a trapezoid, 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 two side sides 5033, 5034, the first bottom side 5031 and the second bottom side 5032 are parallel to each other, each of the two side sides 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 greater than the length of the second bottom side 5032.

[0079] As an example, each of the two sides 5033, 5034 of the trapezoid may have a slope of 45°, that is, Figure 3A As shown, the inclination angle of each of the two side edges 5033 and 5034 relative to the Y direction is 45°. In this case, the length of the first bottom edge 5031 and the length of the second bottom edge 5032 have the following relationship: 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.

[0080] For example, the length of the first bottom side 5031 of the trapezoid may be substantially equal to the dimension of the buffer member 90 along the X direction (ie Figure 4 It should be noted that "substantially equal to" here includes the case where they are exactly equal to each other, and also includes the case where they are slightly greater due to factors such as actual processing technology. For example, the difference between the length of the first bottom side 5031 of the trapezoid and the height H of the buffer 90 is less than or equal to 0.1 mm.

[0081] Reference Figure 3A At least a portion of the 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 the end surface of the buffer member 90 facing the receiving groove 503 abuts against the inner wall of the receiving groove 503. Figure 4 The buffer 90 has a chamfer C on the end surface facing the receiving groove 503. For example, the size of the chamfer C can generally be about 0.2 mm. In addition, the length of the first bottom side 5031 of the trapezoid is equal to or slightly larger than the size of the buffer 90 along the X direction (i.e. Figure 4 Thus, at room temperature, a portion of the buffer member 90 (for example, the chamfered portion) is inserted into the receiving groove 503 and abuts against the inner wall of the receiving groove 503. Figure 3A In this way, the light guide plate 202 is still against the side wall of the back plate 50 through the buffer 90, which can prevent the light guide plate 202 from shaking, thereby avoiding abnormal noise caused by the shaking of the light guide plate 202, scratching the optical film, and other defects.

[0082] Optionally, the first cross section of the receiving groove 503 may also have other shapes, for example, a rectangle, and the size of the rectangular receiving groove along the X direction is equal to or slightly smaller than the size of the buffer member 90 along the X direction (ie Figure 4 The height (H) in the middle is 0.5mm, so that a tight fit (also called an interference fit) is formed between the buffer 90 and the receiving groove 503. In this way, at room temperature, the light guide plate 202 is still pressed against the side wall of the back plate 50 through the buffer 90 to fix the light guide plate 202; at high temperature, the light guide plate 202 squeezes the buffer 90, so that the buffer 90 moves slowly in the receiving groove 503.

[0083] For example, in the embodiment of the present disclosure, the buffer member 90 can be elastically deformed under the pressure of the light guide plate 202, for example, the compression amount of the buffer member 90 can be as high as 50%. Figure 3A , the size of the buffer 90 in the Y direction (in Figure 3A The width (shown in FIG. 2 ) is marked as a. Under the extrusion of the light guide plate 22, the maximum compression of the buffer 90 in the Y direction can be 50%*a, that is, the size of the buffer 90 in the Y direction can be compressed to 0.5a.

[0084] Exemplarily, at room temperature, the light guide plate 202 does not compress the buffer 90, the dimension a of the buffer 90 in the Y direction can be 0.8 mm, and the thermal expansion of the light guide plate 202 can be less than or equal to 1.5 mm. The thickness of the back plate 50 can be 1.5 mm, that is, the thickness of the bottom plate 501 of the back plate 50 and the thickness of the side wall 502 can both be 1.5 mm. Then, when 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 1.5 mm, so the maximum movement of the buffer 90 can be 1.5 mm. In this case, the sum of the maximum movement of the buffer 90 and the maximum compression of the buffer 90 itself is equal to 1.9 mm, which is greater than the maximum value of the thermal expansion of the light guide plate 202 (1.5 mm). That is, the sum of the movement of the buffer 90 and the compression of the buffer 90 itself can compensate for the thermal expansion of the light guide plate 202, thereby ensuring that the light guide plate 202 will not be deformed and arched due to the rigid extrusion force, and at the same time ensuring that the buffer 90 can firmly clamp the light guide plate 202. In other words, the buffer 90 can ensure the positioning of the light guide plate 202 without affecting the free expansion of the light guide plate 202 at high temperature.

[0085] Optionally, the thickness of the back plate can be any value within the range of 0.5 to 1.5 mm, for example, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, etc. The thermal expansion of the light guide plate 202 can be less than or equal to 1.2 mm. It should be understood that the above values ​​are only exemplary and should not be construed as limiting the embodiments of the present disclosure.

[0086] The buffer 90 may further include a connection structure, and the light guide plate 202 may further include a connection matching structure, and the connection structure may be connected to the connection matching structure, in this way, the buffer 90 may be connected to the light guide plate 202. In this way, when the high temperature state changes to the normal temperature state, the light guide plate 202 may pull the buffer 90 to move toward the light guide plate, that is, pull back the buffer 90, to ensure that the light guide plate 202 can always be pressed against the side wall of the back plate 50 through the buffer 90, so as to achieve the effect of continuously positioning and fixing the light guide plate.

[0087] For example, refer to Figure 4 The connection structure may include a connection arm 902 extending from the buffer member 90 toward the light guide plate 202 and a connection hole 904 formed in the connection arm 902. Figure 4 In the illustrated embodiment, the buffer member 90 includes two connecting arms 902 spaced apart along the X direction, and each connecting arm 902 is provided with a connecting hole 904. The connecting and matching structure includes a protruding portion 2024 protruding from the light guide plate 202. Figure 4 In the illustrated embodiment, the light guide plate 202 includes two protrusions 2024 protruding from the upper surface and the lower surface of the light guide plate, respectively. The two protrusions 2024 are respectively inserted into the connection holes 904 of the two connection arms 902. Specifically, the light guide plate 202 includes a first surface (i.e., Figure 4 The lower surface in the middle) and the second surface away from the bottom plate 501 (i.e. Figure 4 The connecting arm includes a first connecting arm 902 (i.e. Figure 4 The lower connecting arm in the middle) and the second connecting arm 902 (i.e. Figure 4 The lower connecting arm 902 is located on the side of the lower surface away from the light guide plate 202, and the upper connecting arm 902 is located on the side of the upper surface away from the light guide plate 202. Each of the lower connecting arm 902 and the upper connecting arm 902 is formed with the connecting hole 904. The protrusion includes a first protrusion 2024 (i.e. Figure 4 The lower raised portion in the middle) and the second raised portion 2024 (ie Figure 4 The lower protrusion 2024 protrudes 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 protrudes 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 between the buffer 90 and the light guide plate 202 can be achieved.

[0088] For another example, Figure 5A is a plan view of a backlight module according to an embodiment of the present disclosure, Figure 5B yes Figure 5A Magnified view of part I in FIG. Figure 5A and Figure 5B The connection structure may include a T-shaped connection groove 906 formed in the buffer 90. The connection matching structure may include a T-shaped protrusion 2026 protruding along the direction. The T-shaped protrusion 2026 is inserted into the T-shaped connection groove 906, in this way, the connection between the buffer 90 and the light guide plate 202 can be achieved.

[0089] Combined with reference Figure 2 , Figure 3A and Figure 3B , the backlight module may include three buffer members 90 and three receiving grooves 503. Figure 2 As shown, the fourth side wall 502 of the back plate 50 is opposite to the first side wall 2021 of the light guide plate 202. In addition to the fourth side wall 502, the three side walls (i.e., the first side wall, the second side wall, and the third side wall) are respectively provided with a receiving groove 503. Correspondingly, the three buffer members 90 are respectively arranged between the three side walls and the corresponding side walls of the light guide plate 202. Specifically, the three buffer members 90 are respectively arranged between the second side wall 2022 of the light guide plate 202 and the first side wall (i.e., the left side wall) of the back plate 50, 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 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. With such an arrangement, the buffer member 90 will not hinder the optical path of the light emitted by the light source 201, thereby not affecting the normal propagation of the light. Moreover, by arranging three buffer members, the light guide plate can be better supported and positioned.

[0090] Optionally, the positions of the buffer member 90 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 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 can correspond. Specifically, the orthographic projection (i.e., the projection along the Z direction) of the buffer member 90 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) can overlap with the orthographic projection (i.e., the projection along the Z direction) of the buffer member 90 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. In this way, the two buffer members 90 can apply force to the light guide plate 202 from the upper side and the lower side respectively, ensuring that the force on the light guide plate 202 is uniform.

[0091] Fig. 6A and Figure 6B They are partial cross-sectional views of a display device according to an embodiment of the present disclosure. Fig. 6A and Figure 6BAs shown, the display device 100 may include a backlight module 20 , a display panel 40 , a middle frame 60 and a front frame 80 .

[0092] 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. Fig. 6A and Figure 6B The display panel 40 may include two substrates arranged opposite to each other, 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 also include a liquid crystal layer arranged 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 structures of the array substrate and the color filter substrate commonly used in the art, which will not be described in detail here.

[0093] The display panel 40 may further include a lower polarizer 403 and an upper polarizer 405. Fig. 6A and Figure 6B In the illustrated embodiment, 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 .

[0094] Reference Fig. 6A and Figure 6B The middle frame 60 is used to carry the display panel 40. For example, a buffer element 70 such as a buffer foam is provided between the carrying 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. The side wall of the front frame 80 is combined with the side wall of the middle frame 60 by, for example, a threaded connection. In this way, the backlight module 20 and the display panel 40 are combined together to form a display device.

[0095] For example, the display device in each embodiment described above may be a vehicle-mounted display device applied to a moving object such as a car, or may be a display device such as a laptop 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 with 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 e-book, or the like.

[0096] For example, the display device 100 may be a 15-inch narrow-frame vehicle-mounted display device.

[0097] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined by 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, the receiving groove being 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 connecting structure, the light guide plate includes a connecting and matching structure, and the connecting structure is connected to the connecting and 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 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 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 also has two side edges, each of which 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 the end surface facing the accommodating groove, and the 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 member includes 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 component 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, wherein 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 are both connected to 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 includes three buffer members, and the accommodating groove is also formed in each of the second side wall and the third side wall. 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.

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