Backlight module and display device

Abstract

The utility model provides a backlight module and a display device.The backlight module comprises a frame body, a light-emitting module, a light guide plate and a limiting element, and the frame body is provided with a bottom plate and a plurality of side parts which are arranged on the periphery of the bottom plate and connected with the bottom plate in a bent mode; the plurality of side parts comprise a first side part, a second side part, a third side part and a fourth side part, so that the frame body is sequentially provided with a first corner, a second corner, a third corner and a fourth corner; the light guide plate extends along the first direction and the second direction, the light guide plate is provided with a light incident side surface corresponding to the third side part, and the light incident side surface faces the light emitting module; the limiting element is arranged on the frame body or the light guide plate, is positioned between the frame body and the light guide plate, and is adjacent to at least one of the first corner, the second corner, the third corner and the fourth corner; the distance between the light-in side face and the light-emitting module in the first direction is limited to be smaller than a preset threshold value.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a backlight module and display device. Background Technology

[0002] With the development of technology, display devices are widely used in everyday electronic products, such as automotive displays, laptops, and mobile phones. Display devices typically include components such as display panels and backlight modules. The backlight module provides the light needed to display images on the display panel. It usually includes a frame and optical elements housed within the frame, such as light-emitting units and light guide plates. During normal assembly, there is a certain gap between the light-emitting units and the light guide plate, for example, 0 to 0.15 mm, at which point the optical state of the backlight module is optimal. In existing technology, a light guide plate fixing adhesive is usually provided on the light-emitting side of the light guide plate (or the side facing away from the light-incident surface). After the backlight module and display panel are assembled to form a display device, the display device needs to undergo aging and reliability tests. During these tests, the light guide plate may expand towards the light-emitting side due to heat or contract towards the light-emitting side due to cooling, causing the gap between the light-emitting units and the light guide plate to exceed 0.2 mm. Furthermore, after the test, the light guide plate has no possibility of returning to its original position, resulting in optical defects.

[0003] Therefore, how to avoid optical defects caused by the displacement of the light guide plate after aging and reliability testing is an urgent problem to be solved. Utility Model Content

[0004] This utility model provides a backlight module and a display device to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model proposes a backlight module, which includes a frame, a light-emitting module, a light guide plate, and limiting elements. The frame has a base plate and multiple side portions disposed around the periphery of the base plate and bent and connected to the base plate. The base plate and the multiple side portions enclose a receiving space. The multiple side portions include a first side portion, a second side portion, a third side portion, and a fourth side portion, so that the frame has a first corner, a second corner, a third corner, and a fourth corner in sequence. The light-emitting module is disposed on the third side portion, and both ends of the light-emitting module are adjacent to the third corner and the fourth corner. The fourth corner; the light guide plate is disposed within the receiving space, the light guide plate extends along the first direction and the second direction, the first direction is perpendicular to the second direction, the light guide plate has a light-incident side facing the third side, the light-incident side faces the light-emitting module; the limiting element is disposed on the frame or the light guide plate, and the limiting element is located between the frame and the light guide plate, the limiting element is adjacent to at least one of the first corner, the second corner, the third corner and the fourth corner, so as to limit the distance between the light-incident side and the light-emitting module in the first direction to be less than a preset threshold.

[0006] As an optional technical solution, the light-emitting module includes a circuit board and a plurality of light-emitting units arranged in an array on the circuit board, the plurality of light-emitting units being arranged along the second direction.

[0007] As an optional technical solution, the limiting element includes a plurality of first elastic limiting members, which are integrally disposed on the first side of the frame and adjacent to the first corner and the second corner of the frame. The light guide plate has a facing side opposite to the light-incident side. The plurality of first elastic limiting members are arranged and extend along the second direction and each abuts against the facing side and the first side.

[0008] As an optional technical solution, the limiting element further includes a plurality of second elastic limiting members. The plurality of second elastic limiting members are integrally disposed on the second side and the fourth side of the frame and adjacent to the first corner and the second corner of the frame. The light guide plate has a first connecting side and a second connecting side connecting the light-incident side and the opposing side. The first connecting side is opposite to the second side and the second connecting side is opposite to the fourth side. Some of the second elastic limiting members extend along the first direction and abut against the first connecting side and the second side, and other second elastic limiting members extend along the first direction and abut against the second connecting side and the fourth side.

[0009] As an optional technical solution, the plurality of first elastic limiting members and the plurality of second elastic limiting members have similar shapes.

[0010] As an optional technical solution, the plurality of first elastic limiting members and the plurality of second elastic limiting members have a first side connecting the frame and a second side abutting the light guide plate, the first side being planar and the second side being arc-shaped.

[0011] As an optional technical solution, the limiting element includes at least one third limiting member and at least one fourth limiting member. The at least one third limiting member and the at least one fourth limiting member are disposed on the light guide plate and adjacent to the third corner and the fourth corner of the frame. The at least one third limiting member and the at least one fourth limiting member have the same shape and size, and the at least one third limiting member and the at least one fourth limiting member are symmetrical about the center line of the light guide plate extending along the first direction.

[0012] As an optional technical solution, the frame includes a first frame and a second frame that fit together. The second frame is located between the first frame and the light guide plate. The at least one third limiting member and the at least one fourth limiting member are protrusions extending from the light guide plate. The second frame has a positioning groove corresponding to the at least one third limiting member and the at least one fourth limiting member, and each protrusion is placed in the corresponding positioning groove.

[0013] As an optional technical solution, in the first direction, each third limiting member has a first sidewall and a second sidewall, both of which are parallel to the second direction, and the first sidewall is coplanar with the light-incident side.

[0014] In addition, the present invention also provides a display device, which includes a display panel and a backlight module as described above, the display panel being disposed on the backlight module.

[0015] This utility model provides a backlight module and a display device. The backlight module includes a frame, a light-emitting module, a light guide plate, and a limiting element. The frame includes a base plate and multiple sides to enclose a receiving space. The multiple sides include four sides so that the frame has four corners in sequence. The light guide plate is disposed in the receiving space formed by the frame. The limiting element is disposed on the frame or on the light guide plate and is located between the frame and the light guide plate. The limiting element is adjacent to at least one of the four corners of the frame. The limiting element limits the light guide plate to prevent the distance between the light-incident side of the light guide plate and the light-emitting module from being less than a preset threshold. Even if the light guide plate expands or contracts after the backlight module has undergone aging and reliability tests, it will not affect the distance between the light guide plate and the light-emitting unit, thus avoiding optical defects in the backlight module. Attached Figure Description

[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the backlight module according to the first embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the backlight module according to the second embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the display device of this utility model. Detailed Implementation

[0020] To more clearly illustrate this utility model, the preferred embodiments and accompanying drawings will be used for further description. Similar components in the drawings are indicated by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of this utility model.

[0021] Please refer to Figure 1 , Figure 1 The diagram shown is a structural schematic of the backlight module according to the first embodiment of this utility model. Figure 1As shown, this utility model proposes a backlight module 100, which includes a frame 10, a light guide plate 20, a limiting element 30, and a light-emitting module 40. The frame 10 has a base plate (not shown) and multiple side plates disposed around the base plate and bent and connected to the base plate. The base plate and the multiple side plates enclose a receiving space. The multiple side plates include a first side portion 11, a second side portion 12, a third side portion 13, and a fourth side portion 14, so that the frame has a first corner 15, a second corner 16, a third corner 17, and a fourth corner 18 in sequence. The light-emitting module 40 is disposed on the third side portion 13, and the two ends of the light-emitting module 40 are adjacent to the third corner 17 and the second side portion 18. Fourth corner 18; Light guide plate 20 is disposed in the receiving space, and light guide plate 20 extends along the first direction D1 and the second direction D2. The first direction D1 and the second direction D2 are perpendicular. Light guide plate 20 has a light-incident side 21 corresponding to the third side 13, and the light-incident side 21 faces the light-emitting module 40; Limiting element 30 is disposed on the frame 10 or the light guide plate 20, and the limiting element 30 is located between the frame 10 and the light guide plate 20. The limiting element 30 is adjacent to at least one of the first corner 15, the second corner 16, the third corner 17 and the fourth corner 18, so as to limit the distance between the light-incident side 21 and the light-emitting module 40 in the first direction D1 to be less than a preset threshold.

[0022] In one embodiment, the light-emitting module 40 includes a circuit board (not shown) and a plurality of light-emitting units 41 arranged in an array on the circuit board. The plurality of light-emitting units 41 are arranged sequentially along the second direction D2 of the light guide plate 20. In practical applications, the first direction D1 is, for example, the length direction of the light guide plate 20, and the second direction D2 is, for example, the width direction of the light guide plate 20. That is, the arrangement direction of the plurality of light-emitting units 41 is parallel to the width direction of the light guide plate 20, and the first corner 15 and the second corner 16 of the frame 10 are adjacent to the light-emitting side of the light guide plate 20, and the third corner 17 and the fourth corner 18 of the frame 10 are adjacent to the light-incident side of the light guide plate 20.

[0023] In one embodiment, the limiting element 30 includes a plurality of first elastic limiting members 31 and a plurality of second elastic limiting members 32. The plurality of first elastic limiting members 31 are integrally disposed on the first side portion 11 of the frame 10 and adjacent to the first corner 15 and the second corner 16 of the frame. The light guide plate 20 has a facing side portion 22 opposite to the light incident side portion 21. The plurality of first elastic limiting members 31 extend along the second direction D2 and each abuts between the facing side portion 22 and the first side portion 11. The plurality of second elastic limiting members 32 are integrally disposed on the frame. On the second side 12 and the fourth side 14 of the frame 10, and adjacent to the first corner 15 and the second corner 16 of the frame 10, the light guide plate 20 has a first connecting side 23 and a second connecting side 24 connecting the light-incident side 21 and the opposing side 22. Some of the second elastic limiting members 32 extend along the first direction D1 and abut against the first connecting side 23 and the second side 12, and other parts of the second elastic limiting members 32 extend along the first direction D1 and abut against the second connecting side 24 and the fourth side 14. In this embodiment, there are two of each of the first elastic limiting member 31 and the second elastic limiting member 32. One first elastic limiting member 31 and one second elastic limiting member 32 form a group. That is, the limiting element 30 includes two groups of first elastic limiting members 31 and second elastic limiting members 32. One group of first elastic limiting members 31 and second elastic limiting members 32 is adjacent to the first corner 15 of the frame 10, and the other group of first elastic limiting members 31 and second elastic limiting members 32 is adjacent to the second corner 16 of the frame 10. In other words, both first elastic limiting members 31 and two second elastic limiting members 32 are located on the light-emitting side (or opposite side 22) of the light guide plate 20.

[0024] In the first embodiment, the backlight module 100 has a frame 10 comprising a base plate and multiple sides to enclose and form a receiving space. The multiple sides include a first side 11, a second side 12, a third side 13, and a fourth side 14, so that the frame sequentially has a first corner 15, a second corner 16, a third corner 17, and a fourth corner 18. A light guide plate 20 is disposed within the receiving space formed by the frame 10. A limiting element 30 is located between the frame 10 and the light guide plate 20 and is located at the first corner 15 and the second corner 16 of the frame 10. The limiting element 30 includes two... The first elastic limiting member 31 and two second elastic limiting members 32 are placed laterally along the second direction D2 of the light guide plate 20, and the two second elastic limiting members 32 are placed vertically along the first direction D1 of the light guide plate 20. The elastic limiting elements 30 placed laterally and vertically limit the light guide plate 20 in the X and Y directions. Even if the light guide plate 20 expands and contracts after aging and reliability tests, it will not affect the distance between the light guide plate 20 and the light-emitting unit 41, thus avoiding optical defects.

[0025] In one embodiment, the two first elastic limiting members 31 and the two second elastic limiting members 32 are similar in shape, or even identical in shape and size, to facilitate manufacturing. The two first elastic limiting members 31 and the two second elastic limiting members 32 are symmetrical about the center line extending along the first direction D1 of the light guide plate 20 (as shown by the dotted line in the figure). However, this is not a limitation in actual applications. The number of multiple first elastic limiting members 31 and multiple second elastic limiting members 32 can also be set to more than two. At the same time, the multiple first elastic limiting members 31 and multiple second elastic limiting members 32 can be asymmetrically arranged about the light guide plate 20. That is, the multiple first elastic limiting members 31 are asymmetrically arranged about the center line and the multiple second elastic limiting members 32 are arranged at different heights in the first direction D1, so that the limiting element 30 as a whole has an asymmetrical structure about the light guide plate 20, as long as it can limit the light guide plate 20.

[0026] In one embodiment, a plurality of first elastic limiting members 31 and a plurality of second elastic limiting members 32 have a first side 301 adjacent to the frame 10 and a second side 302 adjacent to the light guide plate 20. The first side 301 is planar, and the second side 302 is arc-shaped. That is, the first side 301 is completely fitted to the frame 10, while only a small part of the second side 302 contacts the light guide plate 20, reducing the contact area between the limiting member 30 and the light guide plate 20, and reducing the interference effect of the limiting member 30 on the light guide plate 20. In the actual manufacturing process, the plurality of first elastic limiting members 31 and a plurality of second elastic limiting members 32 are integrally formed by injection molding, that is, the plurality of first elastic limiting members 31 and a plurality of second elastic limiting members 32 are integrally structured with the frame 10. After manufacturing, the plurality of first elastic limiting members 31 and a plurality of second elastic limiting members 32 are fixedly connected to the frame 10 and are an inseparable structure, which can save labor assembly costs.

[0027] Please refer to Figure 2 , Figure 2 The diagram shown is a structural schematic of the backlight module according to the second embodiment of this utility model. Figure 2 As shown, the limiting element 30 includes at least one third limiting member 33 and at least one fourth limiting member 34. The at least one third limiting member 33 and at least one fourth limiting member 34 are disposed on the light guide plate 20 and adjacent to the third corner 17 and the fourth corner 18 of the frame 10. That is, the at least one third limiting member 33 and at least one fourth limiting member 34 are located on the light-incident side (or light-incident side 21) of the light guide plate 20.

[0028] In one embodiment, the frame 10 includes a first frame 101 and a second frame 102 that fit together. The second frame 102 is located between the first frame 101 and the light guide plate 20. In practical applications, the second frame 102 can be, for example, a plastic frame. That is, in the first embodiment, the backlight module 100 does not have a plastic frame, while in the second embodiment, the backlight module 100 has a plastic frame. In this case, the second frame 102 (plastic frame) has a positioning groove (not shown in the figure) corresponding to at least one third limiting member 33 and at least one fourth limiting member 34. The at least one third limiting member 33 and at least one fourth limiting member 34 are placed in the corresponding positioning groove. In this embodiment, the limiting element 30 includes a third limiting element 33 and a fourth limiting element 34. However, in actual applications, this is not the limitation. There may be multiple third limiting elements 33 and fourth limiting elements 34. Correspondingly, multiple positioning slots are also provided on the second frame 102. The size of the positioning slots may be slightly larger than the size of the third limiting element 33 and the fourth limiting element 34 to facilitate installation.

[0029] In one embodiment, at least one third limiting member 33 and at least one fourth limiting member 34 are protrusions extending from the light guide plate 20. Each third limiting member 33 has opposing first sidewalls 331 and second sidewalls 332, both of which are parallel to the second direction D2. The first sidewall 331 is coplanar with the light-incident side surface 21. In other words, the third limiting member 33 and the fourth limiting member 34 are formed by extending from the light-incident side surface 21 of the light guide plate 20 along the second direction D2 toward the second side portion 12 and the fourth side portion 14. In practical applications, the third limiting member 33 and the fourth limiting member 34 are not limited to the rectangular shape of the second embodiment; triangular, trapezoidal, circular, etc., shapes are also possible.

[0030] In the second embodiment, the backlight module 100 has a frame 10 comprising a base plate and multiple sides to enclose a receiving space. The multiple sides include a first side 11, a second side 12, a third side 13, and a fourth side 14, so that the frame sequentially has a first corner 15, a second corner 16, a third corner 17, and a fourth corner 18. A light guide plate 20 is disposed within the receiving space formed by the frame 10. Limiting elements 30 are located between the frame 10 and the light guide plate 20, and are located at the third corner 17 and the fourth corner 18 of the frame 10. The third limiting element 33 and the fourth limiting element 34 constrain the light guide plate. The light guide plate 20 is limited in the X and Y directions. At the same time, since the third limiting member 33 and the fourth limiting member 34 are set on the light-incident side of the light guide plate 20, no matter whether the light guide plate 20 expands or contracts, the limiting element 30 on the light-incident side of the light guide plate 20 will prevent it from affecting the distance between the light guide plate 20 and the light-emitting unit 41. In addition, the way of fixing the limiting element 30 to the light-incident side of the light guide plate 20 will not cause the problem of insufficient space for the light guide plate 20 to expand due to heat. Even if the light guide plate 20 expands or contracts after aging test and reliability test, it will not cause optical defects.

[0031] In one embodiment, the third limiting member 33 and the fourth limiting member 34 are identical in shape and size, and are symmetrical about the center line of the light guide plate 20 extending along the first direction D2 (as shown by the dotted line in the figure). However, in actual applications, this is not a limitation. The third limiting member 33 and the fourth limiting member 34 can be set at different heights in the first direction D1, or there can be multiple third limiting members 33 and the fourth limiting member 34, which are arranged alternately in the first direction D1, as long as they can limit the light guide plate 20.

[0032] In one embodiment, the third limiting member 33 and the fourth limiting member 34 are integral with the light guide plate 20, or the third limiting member 33 and the fourth limiting member 34 are separate from the light guide plate 20. In practical applications, the third limiting member 33 and the fourth limiting member 34 are, for example, lug structures, meaning that lug structures can be formed directly during the formation of the light guide plate 20 to play a limiting role. Alternatively, the third limiting member 33 and the fourth limiting member 34 may not be formed simultaneously with the light guide plate 20; the third limiting member 33 and the fourth limiting member 34 are separate components and can be fixedly connected to the light guide plate 20 by additional fasteners.

[0033] In addition, the present invention also provides a display device 200, which includes a display panel 300 and a backlight module 100 as described above, with the display panel 200 disposed on the backlight module 100.

[0034] In summary, this utility model provides a backlight module and a display device. The backlight module includes a frame, a light-emitting module, a light guide plate, and a limiting element. The frame includes a base plate and multiple sides to enclose and form an accommodating space. The multiple sides include four sides so that the frame has four corners in sequence. The light guide plate is disposed within the accommodating space formed by the frame. The limiting element is disposed on the frame or on the light guide plate and is located between the frame and the light guide plate. The limiting element is adjacent to at least one of the four corners of the frame. The limiting element limits the light guide plate to a distance between the light-incident side of the light guide plate and the light-emitting module to be less than a preset threshold. Even if the light guide plate expands or contracts after the backlight module has undergone aging and reliability tests, it will not affect the distance between the light guide plate and the light-emitting unit, thus avoiding optical defects in the backlight module.

[0035] Of course, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A backlight module, characterized in that, The backlight module includes: A frame having a base plate and multiple side portions disposed around the periphery of the base plate and bent and connected to the base plate, the base plate and the multiple side portions enclosing a receiving space, the multiple side portions including a first side portion, a second side portion, a third side portion and a fourth side portion so that the frame has a first corner, a second corner, a third corner and a fourth corner in sequence. A light-emitting module is disposed on the third side, and both ends of the light-emitting module are adjacent to the third corner and the fourth corner; A light guide plate is disposed within the receiving space. The light guide plate extends along a first direction and a second direction, the first direction being perpendicular to the second direction. The light guide plate has a light-incident side facing the third side portion, and the light-incident side faces the light-emitting module. as well as A limiting element is disposed on the frame or the light guide plate, and the limiting element is located between the frame and the light guide plate. The limiting element is adjacent to at least one of the first corner, the second corner, the third corner and the fourth corner, so as to limit the distance between the light-incident side and the light-emitting module in the first direction to be less than a preset threshold.

2. The backlight module according to claim 1, characterized in that, The light-emitting module includes a circuit board and multiple light-emitting units arranged in an array on the circuit board, the multiple light-emitting units being arranged along the second direction.

3. The backlight module according to claim 1, characterized in that, The limiting element includes a plurality of first elastic limiting members, which are integrally disposed on the first side of the frame and adjacent to the first corner and the second corner of the frame. The light guide plate has a facing side opposite to the light-incident side. The plurality of first elastic limiting members are arranged and extend along the second direction and each abuts between the facing side and the first side.

4. The backlight module according to claim 3, characterized in that, The limiting element also includes a plurality of second elastic limiting members, which are integrally disposed on the second side and the fourth side of the frame and adjacent to the first corner and the second corner of the frame. The light guide plate has a first connecting side and a second connecting side connecting the light-incident side and the opposing side. The first connecting side is opposite to the second side and the second connecting side is opposite to the fourth side. Some of the second elastic limiting members extend along the first direction and abut against the first connecting side and the second side, while other second elastic limiting members extend along the first direction and abut against the second connecting side and the fourth side.

5. The backlight module according to claim 4, characterized in that, The plurality of first elastic limiting members and the plurality of second elastic limiting members are similar in shape.

6. The backlight module according to claim 4, characterized in that, The plurality of first elastic limiting members and the plurality of second elastic limiting members have a first side surface that connects to the frame and a second side surface that abuts against the light guide plate. The first side surface is planar and the second side surface is arc-shaped.

7. The backlight module according to claim 1 or 3, characterized in that, The limiting element includes at least one third limiting member and at least one fourth limiting member. The at least one third limiting member and the at least one fourth limiting member are disposed on the light guide plate and adjacent to the third corner and the fourth corner of the frame. The at least one third limiting member and the at least one fourth limiting member have the same shape and size, and the at least one third limiting member and the at least one fourth limiting member are symmetrical about the center line of the light guide plate extending along the first direction.

8. The backlight module according to claim 7, characterized in that, The frame includes a first frame and a second frame that fit together. The second frame is located between the first frame and the light guide plate. The at least one third limiting member and the at least one fourth limiting member are protrusions extending from the light guide plate. The second frame has a positioning groove corresponding to the at least one third limiting member and the at least one fourth limiting member. Each protrusion is placed in the corresponding positioning groove.

9. The backlight module according to claim 7, characterized in that, In the first direction, each third limiting member has a first sidewall and a second sidewall, both of which are parallel to the second direction, and the first sidewall is coplanar with the light-incident side.

10. A display device, characterized in that, The display device includes a display panel and a backlight module as described in any one of claims 1-9, the display panel being disposed on the backlight module.

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