Backlight module and display device

Abstract

Provided is a backlight module, comprising: a backplane; a light guide plate located on the backplane, wherein the light guide plate comprises a first light-incident surface, a second light-incident surface and a light-emergent surface; light sources including a first light source and a second light source, wherein the first light source and the second light source are respectively located on two sides of the light guide plate in a first direction, a light-emergent surface of the first light source is arranged facing the first light-incident surface, and a light-emergent surface of the second light source is arranged facing the second light-incident surface; a first side frame extending in a second direction and located on the side of the first light source facing away from the light guide plate, wherein the first side frame is connected to the side of the backplane facing away from the first light source; and a second side frame extending in the second direction and located on the side of the second light source facing away from the light guide plate, wherein the second side frame is connected to the side of the backplane facing away from the second light source; and the orthographic projection of the first side frame on the backplane is spaced apart from the orthographic projection of the first light source on the backplane, and the orthographic projection of the second side frame on the backplane covers at least a portion of the orthographic projection of the second light source on the backplane.

Description

Backlight module and display device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a backlight module and a display device. BACKGROUND

[0002] With the rapid upgrading of Tablet Personal Computer (TPC) products, the market has a strong demand for high-brightness products in order to pursue better outdoor visual experience. In order to further improve the related performance of TPC, how to improve the light emitting performance of the backlight module is one of the issues that the display product researchers are concerned about.

[0003] The above information disclosed in this section is only for understanding the background of the inventive concept of the present disclosure, and therefore, the above information can contain information that does not constitute the prior art. SUMMARY

[0004] In one aspect, a backlight module is provided, comprising:

[0005] a back plate;

[0006] a light guide plate located on the back plate, the light guide plate comprising a first light-in surface and a second light-in surface, the second light-in surface and the first light-in surface being located on two sides of the light guide plate along a first direction respectively;

[0007] a light source comprising a first light source and a second light source, the first light source and the second light source being located on two sides of the light guide plate along the first direction respectively, an out-light surface of the first light source being arranged to face the first light-in surface, and an out-light surface of the second light source being arranged to face the second light-in surface;

[0008] a first frame extending along a second direction and located on a side of the first light source away from the light guide plate, the first frame being connected to a side of the back plate away from the first light source, the second direction intersecting the first direction; and

[0009] a second frame extending along the second direction and located on a side of the second light source away from the light guide plate, the second frame being connected to a side of the back plate away from the second light source;

[0010] wherein a normal projection of the first frame on the back plate is spaced apart from a normal projection of the first light source on the back plate, and a normal projection of the second frame on the back plate covers at least part of a normal projection of the second light source on the back plate.

[0011] According to some exemplary embodiments, the backlight module further comprises a first circuit board and a second circuit board, the first circuit board comprises a first main body part and a first connecting part, the first main body part is electrically connected with the first light source, one end of the first connecting part is electrically connected with the first main body part and the other end extends out through a first hollow structure in the first frame;

[0012] the second circuit board comprises a second main body part and a second connecting part, the second main body part is electrically connected with the second light source, one end of the second connecting part is electrically connected with the second main body part and the other end extends out through a second hollow structure in the second frame; and

[0013] a projection of the first frame on the back plate is spaced apart from a projection of the first main body part on the back plate, and a projection of the second frame on the back plate at least partially overlaps with a projection of the second main body part on the back plate.

[0014] According to some exemplary embodiments, a dimension of the first frame along the first direction is smaller than a dimension of the second frame along the first direction.

[0015] According to some exemplary embodiments, the second frame comprises a second side plate and a second top plate, the second side plate is connected with a side edge of the back plate away from the second light source, one side of the second top plate is connected with a side edge of the second side plate away from the back plate and the other side extends in a direction close to the light guide plate, at least a part of the second light source is located between the second top plate and the back plate, and / or at least a part of the second main body part is located between the second top plate and the back plate.

[0016] According to some exemplary embodiments, the first frame comprises a first side plate and a first top plate, the first side plate is connected with a side edge of the back plate away from the first light source, one side of the first top plate is connected with a side edge of the first side plate away from the back plate and the other side extends in a direction close to the light guide plate, a dimension of the first top plate along the first direction is smaller than a dimension of the second top plate along the first direction, a projection of the first top plate on the back plate is spaced apart from a projection of the first light source on the back plate, and a projection of the first top plate on the back plate is spaced apart from a projection of the first main body part on the back plate.

[0017] According to some exemplary embodiments, the first frame includes a first side plate and a first glue frame, the first side plate is connected to a side of the back plate away from the first light source, the first glue frame is connected to a side of the first side plate close to the first light source and a side of the first side plate away from the back plate, a distance between the side of the first glue frame close to the first light source and the side of the first side plate away from the first light source along the first direction is less than a distance between the side of the second top plate close to the second light source and the side of the second side plate away from the second light source along the first direction, the first glue frame is spaced apart from the first light source along the first direction, and the first glue frame is spaced apart from the first main body along the first direction.

[0018] According to some exemplary embodiments, the first hollow structure extends from the first side plate to the first top plate and penetrates an edge of the first top plate close to the light guide plate along the first direction.

[0019] According to some exemplary embodiments, the first hollow structure includes a first hollow sub-portion in the first side plate and a second hollow sub-portion in the first glue frame, the first hollow sub-portion extends from a side of the first side plate close to the back plate to a side of the first side plate away from the back plate and penetrates an edge of the first side plate away from the back plate, the second hollow sub-portion extends from a side of the first glue frame close to the back plate to a side of the first glue frame away from the back plate and penetrates an edge of the first glue frame away from the back plate, and the first hollow sub-portion and the second hollow sub-portion are connected.

[0020] According to some exemplary embodiments, the second hollow structure is in the second side plate, and a side of the second hollow structure away from the back plate is cut off at a side of the second top plate close to the back plate.

[0021] According to some exemplary embodiments, at least one corner of the light guide plate is an inner recessed arc-shaped corner;

[0022] At least one of the inner recessed arc-shaped corners is adjacent to the first light source, and a normal projection of the inner recessed arc-shaped corner on the first frame is spaced apart from or tangent to a normal projection of the first light source on the first frame; and / or

[0023] At least one of the inner recessed arc-shaped corners is adjacent to the second light source, and a normal projection of the inner recessed arc-shaped corner on the second frame is spaced apart from or tangent to a normal projection of the second light source on the second frame.

[0024] According to some exemplary embodiments, the first light source includes a plurality of light emitting devices spaced apart along the second direction, and / or the second light source includes a plurality of light emitting devices spaced apart along the second direction; and

[0025] The size of the light emitting device along the second direction is a first size, the interval of adjacent light emitting devices along the second direction is a second size, and the size of the concave arc-shaped corner along the second direction is a third size, the third size ≤ the first size + the second size.

[0026] According to some exemplary embodiments, the backlight module further comprises a first light source reflecting film located on a side of the first light source away from the back plate, a first adhesive located on a side of the first light source reflecting film away from the back plate, and a diffusion film located on a side of the first adhesive away from the back plate, and the diffusion film extends from a side of the first adhesive away from the back plate to a side of the light guide plate away from the back plate.

[0027] According to some exemplary embodiments, the backlight module further comprises a light enhancement film located on a side of the diffusion film away from the back plate, and a side of the light enhancement film away from the back plate is substantially flush with a side of the first top plate away from the back plate.

[0028] According to some exemplary embodiments, the light enhancement film comprises a first light enhancement film located on a side of the diffusion film away from the back plate, and a second light enhancement film located on a side of the first light enhancement film away from the back plate, a side of the first light enhancement film close to the first frame is substantially flush with a side of the diffusion film close to the first frame, and a side of the second light enhancement film close to the first frame is farther away from the first frame than a side of the first light source reflecting film away from the first frame.

[0029] The first light enhancement film comprises a first part located on a side of the first light source reflecting film away from the back plate, a side of the first part away from the back plate is substantially flush with a side of the first top plate away from the back plate, and a side of the first part away from the back plate is substantially flush with a side of the second light enhancement film away from the back plate.

[0030] According to some exemplary embodiments, the backlight module further comprises a third frame and a fourth frame respectively located on two sides of the light guide plate along the second direction, the third frame is provided with a third adhesive frame, and / or the fourth frame is provided with a fourth adhesive frame.

[0031] According to some exemplary embodiments, a side of the light guide plate close to the back plate is provided with a plurality of first mesh points arranged in an array, the plurality of first mesh points comprises a first mesh point part and a second mesh point part arranged along the first direction, the first mesh point part is located on a side close to the first light source, and the second mesh point part is located on a side close to the second light source.

[0032] In the first mesh point part, the distribution density of the first mesh points gradually increases along a direction from the first light source to the second light source.

[0033] In the second dot portion, the distribution density of the first dots gradually decreases along a direction from the first light source to the second light source.

[0034] According to some exemplary embodiments, the plurality of dots comprises a plurality of columns of first dots arranged along the first direction;

[0035] In the first dot portion, the interval of two adjacent columns of first dots along the first direction gradually decreases along a direction from the first light source to the second light source, and among the four adjacent columns of first dots, the interval of the first column of first dots closest to the first light source and the adjacent column of first dots along the first direction is a first interval, the interval of the two columns of first dots in the middle along the first direction is a second interval, and the interval of the first column of first dots farthest from the first light source and the adjacent column of first dots along the first direction is a third interval, the difference between the first interval and the second interval being greater than the difference between the second interval and the third interval; and / or

[0036] In the second dot portion, the interval of two adjacent columns of first dots along the first direction gradually increases along a direction from the first light source to the second light source, and among the four adjacent columns of first dots, the interval of the first column of first dots closest to the second light source and the adjacent column of first dots along the first direction is a fourth interval, the interval of the two columns of first dots in the middle along the first direction is a fifth interval, and the interval of the first column of first dots farthest from the second light source and the adjacent column of first dots along the first direction is a sixth interval, the difference between the fourth interval and the fifth interval being greater than the difference between the fifth interval and the sixth interval.

[0037] According to some exemplary embodiments, the shape of the first dot comprises a triangular pyramid, the first dot comprises a first base, a first edge, a second edge and a third edge, the first base is an isosceles triangle, the first edge is connected to the intersection of the two legs of the first base, and the first edge is perpendicular to the first base, the second edge and the third edge and the base of the first base form a first side;

[0038] The first dot is recessed from the side of the light guide plate close to the back plate to the direction away from the back plate, and the first base is substantially flush with the side of the light guide plate close to the back plate; and

[0039] In the first dot portion, the first side of the first dot faces the light emitting surface of the first light source, and in the second dot portion, the first side of the first dot faces the light emitting surface of the second light source.

[0040] According to some exemplary embodiments, in the first mesh point part, the first side of the first mesh point faces the light exit surface of the first light source and the third frame, and the included angle between the side edge connecting the first side and the first bottom surface and the light exit surface of the first light source is a first included angle; and

[0041] In the second mesh point part, the first side of the first mesh point faces the light exit surface of the second light source and the fourth frame, and the included angle between the side edge connecting the first side and the first bottom surface and the light exit surface of the second light source is a second included angle.

[0042] Among them, the first included angle and the second included angle are substantially equal, and the first included angle and the second included angle are acute angles.

[0043] According to some exemplary embodiments, the top angle of the first bottom surface is an obtuse angle; and / or

[0044] The included angle between the first bottom surface and the first side is 45°.

[0045] According to some exemplary embodiments, the light guide plate further comprises a third light entrance surface, and the third light entrance surface is located on one side of the light guide plate in the second direction.

[0046] The backlight module further comprises a third light source and a third frame, the third light source is located on one side of the light guide plate in the second direction, the light exit surface of the third light source faces the third light entrance surface, the third frame is located on the side of the third light source away from the light guide plate, the third frame comprises a third side plate and a third top plate, the third side plate is connected to the side edge of the back plate away from the third light source, and one side of the third top plate is connected to the side edge of the third side plate away from the back plate and the other side extends in the direction close to the light guide plate; and

[0047] The size of the third top plate in the second direction is smaller than the size of the second top plate in the first direction, and the orthographic projection of the third top plate on the back plate is spaced apart from the orthographic projection of the third light source on the back plate.

[0048] According to some exemplary embodiments, the backlight module further comprises a fourth frame, and the fourth frame is located on the side of the light guide plate away from the third frame.

[0049] The fourth frame comprises a fourth side plate and a fourth top plate, the fourth side plate is connected to the side edge of the back plate away from the third frame, and one side of the fourth top plate is connected to the side edge of the fourth side plate away from the back plate and the other side extends in the direction close to the light guide plate; and

[0050] The fourth top plate has a size along the second direction smaller than a size of the second top plate along the first direction, and a projection of the fourth top plate on the back plate is spaced apart from a projection of the light guide plate on the back plate.

[0051] According to some exemplary embodiments, the light guide plate is provided with a plurality of second dots arranged in an array on the side close to the back plate, and the distribution density of the second dots gradually decreases in a direction away from the third light source.

[0052] According to some exemplary embodiments, the plurality of second dots includes a plurality of rows of second dots arranged along a second direction, and the distance between two adjacent rows of second dots gradually decreases in a direction away from the third light source.

[0053] In the four rows of second dots, the distance between the first row of second dots closest to the third light source and the adjacent row of second dots is a seventh distance, the distance between the two middle rows of second dots is an eighth distance, and the distance between the last row of second dots farthest from the third light source and the adjacent row of second dots is a ninth distance, and the difference between the seventh distance and the eighth distance is smaller than the difference between the eighth distance and the ninth distance.

[0054] According to some exemplary embodiments, the shape of the second dot includes a triangular pyramid, the second dot includes a second base, a fourth edge, a fifth edge, and a sixth edge, the second base is in the shape of an isosceles triangle, the fourth edge is connected to the intersection of the two legs of the second base and is perpendicular to the second base, and the fifth edge, the sixth edge, and the bottom edge of the second base form a second side.

[0055] The second dot is recessed in a direction away from the back plate from the side of the light guide plate close to the back plate, and the second base is substantially flush with the side of the light guide plate close to the back plate; and

[0056] The second side faces the third light source, and the side of the second base connected to the second side is parallel to the light emitting surface of the third light source.

[0057] According to some exemplary embodiments, the top angle of the second base is an acute angle; and / or

[0058] The size of the second base along the second direction is equal to the length of the fourth edge.

[0059] According to some exemplary embodiments, the light guide plate further comprises a third light-incident surface and a fourth light-incident surface, the third light-incident surface and the fourth light-incident surface are respectively located on two sides of the light guide plate along a second direction, the backlight module further comprises a third light source and a fourth light source, the third light source and the fourth light source are respectively located on two sides of the light guide plate along the second direction, a light- emitting surface of the third light source is arranged to face the third light-incident surface, and a light-emitting surface of the fourth light source is arranged to face the fourth light-incident surface.

[0060] The backlight module further comprises a third frame and a fourth frame, the third frame is located on a side of the third light source away from the light guide plate, the third frame comprises a third side plate and a third top plate, the third side plate is connected to a side edge of the back plate away from the third light source, one side of the third top plate is connected to a side edge of the third side plate away from the back plate and the other side extends to be arranged in a direction close to the light guide plate, the fourth frame is located on a side of the fourth light source away from the light guide plate, the fourth frame comprises a fourth side plate and a fourth top plate, the fourth side plate is connected to a side edge of the back plate away from the fourth light source, and one side of the fourth top plate is connected to a side edge of the fourth side plate away from the back plate and the other side extends to be arranged in a direction close to the light guide plate; and

[0061] A dimension of the third top plate along the second direction is less than a dimension of the second top plate along the first direction, a normal projection of the third top plate on the back plate is spaced apart from a normal projection of the third light source on the back plate, a dimension of the fourth top plate along the second direction is less than a dimension of the second top plate along the first direction, and a normal projection of the fourth top plate on the back plate is spaced apart from a normal projection of the fourth light source on the back plate.

[0062] According to some exemplary embodiments, the light guide plate is provided with a plurality of third mesh points arranged in an array on a side close to the back plate, and the plurality of third mesh points are uniformly distributed.

[0063] According to some exemplary embodiments, a shape of the third mesh point comprises a quadrangular pyramid, the third mesh point comprises a third bottom surface, the third bottom surface is a rhombus, and a normal projection of a vertex of the third bottom surface away from the third mesh point on the third bottom surface coincides with a geometric center of the third bottom surface.

[0064] The third mesh point is recessed in a direction away from the back plate from the side of the light guide plate close to the back plate, and the third bottom surface is substantially flush with the side of the light guide plate close to the back plate; and

[0065] The third bottom surface comprises a first diagonal line parallel to the light exit surface of the first light source and the light exit surface of the second light source, and a second diagonal line parallel to the light exit surface of the third light source and the light exit surface of the fourth light source.

[0066] According to some exemplary embodiments, the light guide plate has a dimension along the second direction smaller than a dimension along the first direction, and the first diagonal line has a length smaller than a length of the second diagonal line.

[0067] According to some exemplary embodiments, the third net point comprises a seventh edge and an eighth edge, the seventh edge and the eighth edge coincide with the second diagonal line in the orthographic projection of the third bottom surface, the seventh edge forms an angle of 45° with the third bottom surface, and the eighth edge forms an angle of 45° with the third bottom surface.

[0068] In another aspect, a display device is provided, comprising a display panel and the backlight module according to any one of the above, the display panel being located at one side of the light exit surface of the backlight module.

[0069] According to some exemplary embodiments, the display device further comprises:

[0070] a cover plate located at a side of the display panel away from the backlight module, an edge of the cover plate protruding from an edge of the display panel;

[0071] a first adhesive layer located between the backlight module and the display panel, one side of the first adhesive layer extending to a side of the first frame and / or the second frame away from the back plate; and

[0072] a support strip located between the first adhesive layer and the cover plate, an orthographic projection of the support strip on the back plate at least partially overlapping an orthographic projection of the first frame on the back plate.

[0073] According to some exemplary embodiments, the display panel comprises:

[0074] a first polarizing layer located on the backlight module;

[0075] an array substrate located at a side of the first polarizing layer away from the backlight module;

[0076] a color film substrate located at a side of the array substrate away from the backlight module; and

[0077] a second polarizing layer located at a side of the color film substrate away from the back plate.

[0078] The support strip is closer to the backlight module than the side of the color film substrate away from the backlight module.

[0079] According to some exemplary embodiments, the display device further comprises a packaging tape, one end of the packaging tape being attached to the side of the display panel away from the backlight module, and the other end extending to the side of the back plate away from the light guide plate via the side of the support strip away from the back plate and the side of the first frame away from the light guide plate. BRIEF DESCRIPTION OF DRAWINGS

[0080] Other objects and advantages of the present disclosure will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0081] FIG. 1 schematically shows a plan view of a display device in the related art.

[0082] FIG. 2 schematically shows a cross-sectional view of a backlight module in the related art.

[0083] FIGS. 3A-3B schematically show cross-sectional views of a backlight module in the related art.

[0084] FIG. 4 schematically shows a plan view of a backlight module according to some embodiments of the present disclosure.

[0085] FIG. 5A schematically shows a cross-sectional view taken along line AA’ in FIG. 4.

[0086] FIG. 5B schematically shows a cross-sectional view taken along line BB’ in FIG. 4.

[0087] FIG. 5C schematically shows a cross-sectional view taken along line CC’ in FIG. 4.

[0088] FIG. 5D schematically shows a cross-sectional view taken along line DD’ in FIG. 4.

[0089] FIG. 5E schematically shows another cross-sectional view taken along line AA’ in FIG. 4.

[0090] FIG. 6A schematically shows an enlarged view of region A1 in FIG. 4.

[0091] FIG. 6B schematically shows a cross-sectional view taken along line EE’ in FIG. 6A.

[0092] FIG. 6C schematically shows another enlarged view of region A1 in FIG. 4.

[0093] FIG. 6D schematically shows a side view of the first hollow structure in FIG. 6C.

[0094] FIG. 7A schematically shows an enlarged view of region A2 in FIG. 4.

[0095] FIG. 7B schematically illustrates a cross-sectional view taken along line FF’ of FIG. 7A.

[0096] FIG. 8 schematically illustrates a magnified view of region A3 in FIG. 4.

[0097] FIG. 9 schematically illustrates an assembly flow chart of a backlight module according to some embodiments of the present disclosure.

[0098] FIG. 10 schematically illustrates a plan view of a dot structure on a light guide plate in a backlight module according to some embodiments of the present disclosure.

[0099] FIG. 11 schematically illustrates a distribution density trend chart of a dot structure on a light guide plate in a backlight module according to some embodiments of the present disclosure.

[0100] FIG. 12A schematically illustrates a perspective view of a first dot on a light guide plate in a backlight module according to some embodiments of the present disclosure.

[0101] FIG. 12B schematically illustrates a cross-sectional view of a dot structure on a light guide plate in a backlight module according to some embodiments of the present disclosure.

[0102] FIG. 13 schematically illustrates a plan view of a backlight module according to some embodiments of the present disclosure.

[0103] FIG. 14A schematically illustrates a cross-sectional view taken along line GG’ of FIG. 13.

[0104] FIG. 14B schematically illustrates a cross-sectional view taken along line HH’ of FIG. 13.

[0105] FIG. 14C schematically illustrates a magnified view of region A4 in FIG. 13.

[0106] FIG. 15 schematically illustrates an assembly flow chart of a backlight module according to some embodiments of the present disclosure.

[0107] FIG. 16 schematically illustrates a plan view of a dot structure on a light guide plate in a backlight module according to some embodiments of the present disclosure.

[0108] FIG. 17 schematically illustrates a distribution density trend chart of a dot structure on a light guide plate in a backlight module according to some embodiments of the present disclosure.

[0109] FIG. 18A schematically illustrates a perspective view of a second dot on a light guide plate in a backlight module according to some embodiments of the present disclosure.

[0110] FIG. 18B schematically illustrates a cross-sectional view of a dot structure on a light guide plate in a backlight module according to some embodiments of the present disclosure.

[0111] FIG. 19 schematically illustrates a plan view of a backlight module, according to some embodiments of the present disclosure.

[0112] FIG. 20 schematically illustrates a cross-sectional view taken along line JJ’ in FIG. 19.

[0113] FIG. 21 schematically illustrates a plan view of a dot structure on a light guide plate in a backlight module, according to some embodiments of the present disclosure.

[0114] FIG. 22A schematically illustrates a perspective view of a third dot on a light guide plate in a backlight module, according to some embodiments of the present disclosure.

[0115] FIG. 22B schematically illustrates a cross-sectional view of a dot structure on a light guide plate in a backlight module, according to some embodiments of the present disclosure.

[0116] FIG. 23A schematically illustrates a cross-sectional view of a display device, according to some embodiments of the present disclosure.

[0117] FIG. 23B schematically illustrates a cross-sectional view of a display device, according to some other embodiments of the present disclosure.

[0118] FIG. 24 schematically illustrates a plan view of a display device, according to some embodiments of the present disclosure.

[0119] FIG. 25 schematically illustrates a plan view of a display device, according to some embodiments of the present disclosure.

[0120] It is to be noted that, for the sake of clarity, the size of layers, structures or regions in the drawings can be exaggerated or reduced relative to actual sizes, i.e. the drawings are not drawn to scale. DETAILED DESCRIPTION

[0121] In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the various exemplary embodiments. It is apparent, however, that various exemplary embodiments can be practiced without

[0122] In the drawings, the size and relative sizes of elements and regions can be exaggerated for clarity and / or descriptive purposes. As such, the dimensions and relative sizes of the elements illustrated in the figures can not be drawn to scale. When exemplary embodiments can be carried out in different ways, specific process sequences can be performed in a different order from the described order. For example, two consecutively described processes can be performed substantially simultaneously or in reverse order to the described order. Also, like reference numerals can denote like elements throughout the specification.

[0123] When an element is described as being "on" another element, "connected to" another element, or "coupled to" another element, it can be directly on, directly connected to, or directly coupled to the other element or intervening elements can be present. In contrast, when an element is described as being "directly on," "directly connected to," or "directly coupled to" another element, there are no intervening elements present. Other terms of description used herein can be interpreted similarly, such as "between" versus "directly between," "adjacent" versus "directly adjacent," or "on" versus "directly on," etc. In addition, the term "connected" can refer to physical or electrical connection, communication connection, and / or fluid connection. Furthermore, the X-axis, Y-axis, and Z-axis are not limited to three axes of a rectangular coordinate system, and can be interpreted in a broader sense. For example, the X-axis, Y-axis, and Z-axis can be perpendicular to each other, or can represent different directions that are not perpendicular to each other. For the purpose of the present disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" can be interpreted as any one of X, Y, Z, or any combination of two or more of X, Y, and Z, such as XYZ, XY, YZ, and XZ. As used herein, the term "and / or" includes any and all combinations of one or more of the associated items.

[0124] It will be understood that, although the terms first, second, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments.

[0125] FIG. 1 schematically illustrates a plan view of a display apparatus in the related art.

[0126] Referring to FIG. 1, the display device includes a backlight module BLU and a display panel PNL located at a light exit surface side of the backlight module BLU. The backlight module BLU is a side-in backlight module BLU, and the light source 130 is arranged in a single side-in light mode, i.e., the light source 130 is located at one side of the backlight module BLU. At the same time, the driving chip IC of the display panel PNL and the light source 130 of the backlight module BLU are arranged at the same side. In the display device, there are some problems. On the one hand, the light emitted by the light source 130 is limited, and the brightness of the backlight is difficult to meet the high-brightness display requirement of the display device. On the other hand, since the light source 130 and the driving chip IC are arranged at the same side, the heat generated by the driving chip IC in operation and the heat generated by the light source 130 in operation will be superimposed, which will cause the backlight module BLU and the display panel PNL to have a risk of overheating, affecting the reliability and service life of the display device.

[0127] FIG. 2 schematically shows a cross-sectional view of a backlight module in the related art.

[0128] Referring to FIG. 2, in order to improve the brightness of the backlight, the inventors adjust the light-in mode of the backlight module from single side-in light to double side-in light, i.e., two light sources 130 are arranged at opposite sides of the light guide plate 120. In this way, the light flux incident into the light guide plate 120 can be increased. In the two side frames in which the light sources 130 are arranged, the side frame on one side adopts a U-fold structure, and the side frame on the other side adopts a glue-iron integrated structure. However, this will cause interference between the glue-iron integrated frame, the light source 130, and the light guide plate 120 during assembly (the position shown by the dashed circle in FIG. 2), so that the assembly cannot be completed.

[0129] FIGS. 3A-3B schematically show cross-sectional views of a backlight module in the related art.

[0130] Referring to FIG. 3A, in order to solve the problem of being unable to assemble, the inventors arrange the side frame on one side as a glue-iron separated structure, i.e., after the light guide plate 120 and the light source 130 are assembled, the glue frame 91 is assembled to the frame 92 of the backlight module. The structure of the backlight module obtained after assembly can be referred to FIG. 3B.

[0131] However, the inventors further found in the research process that, if the structure shown in FIG. 3B is adopted, the assembly process of the backlight module will be complicated, the assembly yield will be low, and full-automatic assembly cannot be realized, which is not conducive to large-scale production.

[0132] FIG. 4 schematically shows a plan view of a backlight module according to some embodiments of the present disclosure. FIG. 5A schematically shows a cross-sectional view taken along line AA' in FIG. 4. FIG. 5B schematically shows a cross-sectional view taken along line BB' in FIG. 4. FIG. 5C schematically shows a cross-sectional view taken along line CC' in FIG. 4. FIG. 5D schematically shows a cross-sectional view taken along line DD' in FIG. 4. FIG. 5E schematically shows another cross-sectional view taken along line AA' in FIG. 4.

[0133] With reference to FIG. 4, FIG. 5A and FIG. 5B, the backlight module includes a back plate 110, a light guide plate 120 and light sources 130. The light guide plate 120 is located on the back plate 110, a side of the light guide plate 120 away from the back plate 110 is a light exit face 12E of the light guide plate 120, and light entrance faces of the light guide plate 120 include a first light entrance face 12A and a second light entrance face 12B, the second light entrance face 12B and the first light entrance face 12A are located on two sides of the light guide plate 120 along a first direction X respectively. The light sources 130 include a first light source 131 and a second light source 132, the first light source 131 and the second light source 132 are located on two sides of the light guide plate 120 along the first direction X respectively, a light exit face 131A of the first light source 131 is arranged to face the first light entrance face 12A, a light exit face 132A of the second light source 132 is arranged to face the second light entrance face 12B, and the first light source 131 and the second light source 132 respectively emit light into the light guide plate 120 from the first light entrance face 12A and the second light entrance face 12B.

[0134] The display module further includes a first bezel 210 located on a side of the first light source 131 and a second bezel 220 located on a side of the second light source 132. The first bezel 210 is arranged to extend along a second direction Y and is located on a side of the first light source 131 away from the light guide plate 120, the first bezel 210 is connected to a side of the back plate 110 away from the first light source 131, and the second bezel 220 is arranged to extend along the second direction Y and is located on a side of the second light source 132 away from the light guide plate 120, the second bezel 220 is connected to a side of the back plate 110 away from the second light source 132. A projection of the first bezel 210 on the back plate 110 is spaced apart from a projection of the first light source 131 on the back plate 110, and a projection of the second bezel 220 on the back plate 110 covers at least part of a projection of the second light source 132 on the back plate 110.

[0135] In the display module provided in the embodiments of the present disclosure, by arranging the first frame 210 apart from the first light source 131 and arranging the orthographic projection of the second frame 220 on the back plate 110 to cover at least part of the orthographic projection of the second light source 132 on the back plate 110, in the assembling process of the backlight module, the second light source 132 can be obliquely inserted into the second frame 220, that is, the structure of the second frame 220 and the second light source 132 is formed, and then the first light source 131 is placed beside the first frame 210, that is, the structure of the first frame 210 and the first light source 131 is formed. In the assembling process of the backlight module, the first light source 131 and the second light source 132 will not interfere with the frame, so that the assembling process of the backlight module is simple and full-automatic assembling can be realized. In addition, by arranging the first light source 131 and the second light source 132 on the two sides of the light guide plate 120 along the first direction X, the brightness of the backlight module can be effectively improved.

[0136] In the display module provided in the embodiments of the present disclosure, referring to FIGS. 5A and 5B, the size of the first frame 210 along the first direction X is smaller than the size of the second frame 220 along the first direction X. Since the second light source 132 is located inside the second frame 220, the size of the second frame 220 along the first direction X can be set larger to improve the supporting effect of the second frame 220 on the display panel assembled on the backlight module.

[0137] According to some exemplary embodiments, referring to FIG. 5A, the first frame 210 includes a first side plate 211 and a first top plate 212 connected together. The first side plate 211 is connected to the side of the back plate 110 away from the first light source 131, and the first side plate 211 can be arranged substantially perpendicular to the back plate 110. One side of the first top plate 212 is connected to the side of the first side plate 211 away from the back plate 110, and the other side extends in the direction close to the light guide plate 120. The second direction Y intersects the first direction X. The first top plate 212 is arranged substantially parallel to the back plate 110, and the first top plate 212, the first side plate 211 and the back plate 110 form a U-shaped structure. When the backlight module is assembled with the display panel, the U-shaped structure can be used to support one side of the display panel.

[0138] Referring to FIG. 5B, the second frame 220 includes a second side plate 221 and a second top plate 222. The second side plate 221 is connected to the side of the back plate 110 away from the second light source 132, and can be substantially perpendicular to the back plate 110. The second top plate 222 is connected to the side of the second side plate 221 away from the back plate 110, and extends in a direction close to the light guide plate 120. The second top plate 222 is substantially parallel to the back plate 110, and forms a U-shaped support structure with the second side plate 221 and the back plate 110. When the backlight module is assembled with the display panel, the U-shaped structure can be used to support one side of the display panel.

[0139] Referring to FIGS. 5A and 5B, the distance D1 between the side of the first top plate 212 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z (the direction perpendicular to the light exit surface 12E of the light guide plate 120) is substantially equal to the distance D2 between the side of the second top plate 222 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z. That is, the side of the first top plate 212 away from the back plate 110 and the side of the second top plate 222 away from the back plate 110 are substantially at the same height. The size D3 of the first top plate 212 along the first direction X is smaller than the size D4 of the second top plate 222 along the first direction X. The orthogonal projection of the first top plate 212 on the back plate 110 is spaced apart from the orthogonal projection of the first light source 131 on the back plate 110, and the orthogonal projection of the second top plate 222 on the back plate 110 at least partially overlaps the orthogonal projection of the second light source 132 on the back plate 110.

[0140] In the backlight module provided in the embodiments of the present disclosure, by setting the orthographic projection of the first top plate 212 on the back plate 110 and the orthographic projection of the first light source 131 on the back plate 110 to be non-overlapping, the first light source 131 will not interfere with the first frame 210 in the process of assembling the light source 130 and the light guide plate 120, and after the light source 130 and the light guide plate 120 are assembled, there is no need to assemble a glue frame at the first frame 210, the assembly process is simple, and full automatic assembly can be achieved. On the other hand, by setting the orthographic projection of the second top plate 222 on the back plate 110 to partially overlap the orthographic projection of the second light source 132 on the back plate 110, i.e., by setting the size of the second top plate 222 along the first direction X to be larger, the supporting effect of the second top plate 222 can be improved. In addition, in the process of assembling the light source 130 and the light guide plate 120, the second light source 132 can be obliquely inserted between the second top plate 222 and the back plate 110, so that even if the size of the second top plate 222 is increased, it will not affect the assembly. That is, by arranging the first light source 131 and the second light source 132 on the two sides of the light guide plate 120 along the first direction X, the brightness of the backlight module can be effectively improved. In addition, by specifically designing the first frame 210 and the second frame 220, the assembly process of the backlight module is simple and full automatic assembly can be achieved.

[0141] It should be noted that the size of the light guide plate 120 along the first direction X can be larger than the size along the second direction Y, and the first light source 131 and the second light source 132 can be arranged on the two sides of the light guide plate 120 along the first direction X, or the first light source 131 and the second light source 132 can also be arranged on the two sides of the light guide plate 120 along the second direction Y.

[0142] According to some exemplary embodiments, referring to FIG. 5B, the orthographic projection of the second top plate 222 on the back plate 110 covers the orthographic projection of the second light source 132 on the back plate 110, and the orthographic projection of the second top plate 222 on the back plate 110 partially overlaps the orthographic projection of the light guide plate 120 on the back plate 110. The second top plate 222 can be extended to overlap a part of the light guide plate 120, i.e., the size D4 of the second top plate 222 along the first direction X is set to be larger, so as to further improve the supporting effect of the second top plate 222.

[0143] According to some exemplary embodiments, referring to FIGS. 5A and 5B, the distance D5 between the side of the first light source 131 away from the light guide plate 120 and the side of the first side plate 211 close to the light guide plate 120 along the first direction X is substantially equal to the distance D6 between the side of the second light source 132 away from the light guide plate 120 and the side of the second side plate 221 close to the light guide plate 120 along the first direction X, so that the light emitting area of the backlight module is located at the central position along the first direction X, thereby the light emitting area of the backlight module can be better matched with the display area of the display panel assembled on the backlight module, and the display uniformity of the display panel assembled on the backlight module can be improved.

[0144] According to some exemplary embodiments, referring to FIG. 5E, the first frame 210 includes the first side plate 211 and the first glue frame 213, the first side plate 211 is connected to the side of the back plate 110 away from the first light source 131, and the first glue frame 213 is connected to the side of the first side plate 211 close to the first light source 131 and the side of the first side plate 211 away from the back plate 110, the side of the first glue frame 213 away from the first light source 131 and the side of the first side plate 211 away from the first light source 131 are substantially flush, and the side of the first glue frame 213 away from the back plate 110 is farther away from the back plate 110 than the side of the first side plate 211 away from the back plate 110. The first glue frame 213 is spaced apart from the first light source 131 along the first direction X, and the first glue frame 213 is spaced apart from the first main body 311 along the first direction X, that is, the orthogonal projection of the first glue frame 213 on the back plate 110 is spaced apart from the orthogonal projection of the first light source 131 on the back plate 110, and the orthogonal projection of the first glue frame 213 on the back plate 110 is spaced apart from the orthogonal projection of the first main body 311 on the back plate 110. In this way, the first frame 210 includes the first side plate 211 and the first glue frame 213, that is, the first frame 210 adopts a structure of glue and iron integration, and by spacing the first glue frame 213, the first light source 131 and the first main body 311, the problem of interference between the first light source 131 and the first frame 210 can be effectively avoided during the assembly of the backlight module.

[0145] According to some exemplary embodiments, referring to FIGS. 5B and 5E, the distance D17 between the side of the first glue frame 213 close to the first light source 131 and the side of the first side plate 211 away from the first light source 131 along the first direction X is less than the distance D18 between the side of the second top plate close to the second light source 132 and the side of the second side plate away from the second light source 132 along the first direction X.

[0146] According to some exemplary embodiments, referring to FIGS. 5B and 5E, the size D18 of the first frame 213 along the third direction Z is substantially equal to the distance D2 of the side of the second top plate 222 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z, i.e., the support height of the first frame 210 is consistent with the support height of the second frame 220.

[0147] FIG. 6A schematically shows an enlarged view of the region A1 in FIG. 4. FIG. 6B schematically shows a cross-sectional view taken along line EE' of FIG. 6A. FIG. 6C schematically shows another enlarged view of the region A1 in FIG. 4. The cross-sectional view taken along line KK' of FIG. 6C can refer to FIG. 6B. FIG. 7A schematically shows an enlarged view of the region A2 in FIG. 4. FIG. 7B schematically shows a cross-sectional view taken along line FF' of FIG. 7A.

[0148] According to some exemplary embodiments, referring to FIGS. 4, 6A and 7A, the backlight module further includes a first circuit board 310 and a second circuit board 320. The first circuit board 310 includes a first main body part 311 and a first connecting part 312. The first main body part 311 extends along the second direction Y, and the first connecting part 312 extends along the first direction X. The first main body part 311 is electrically connected to the first light source 131, and one end of the first connecting part 312 is electrically connected to the first main body part 311 and the other end extends out through the first hollow structure 141 in the first frame 210. The first main body part 311 is configured to input a light-emitting control signal to the first light source 131 to drive the first light source 131 to emit light, and the first connecting part 312 extends out of the backlight module through the first hollow structure 141 in the first frame 210 and is electrically connected to an external driving component. The second circuit board 320 includes a second main body part 321 and a second connecting part 322. The second main body part 321 extends along the second direction Y, and the second connecting part 322 extends along the first direction X. The second main body part 321 is electrically connected to the second light source 132, and one end of the second connecting part 322 is electrically connected to the second main body part 321 and the other end extends out through the second hollow structure 142 in the second frame 220. The second main body part 321 is configured to input a light-emitting control signal to the second light source 132 to drive the second light source 132 to emit light, and the second connecting part 322 extends out of the backlight module through the second hollow structure 142 in the second frame 220 and is electrically connected to an external driving component.

[0149] With reference to FIGS. 5A and 5B, the orthogonal projection of the first frame 210 on the back plate 110 is spaced apart from the orthogonal projection of the first main body 311 on the back plate 110, and the orthogonal projection of the second frame 220 on the back plate 110 at least partially overlaps the orthogonal projection of the second main body 321 on the back plate 110. For example, the orthogonal projection of the first top plate 212 on the back plate 110 is spaced apart from the orthogonal projection of the first main body 311 on the back plate 110, and the orthogonal projection of the second top plate 222 on the back plate 110 at least partially overlaps the orthogonal projection of the second main body 321 on the back plate 110. By setting the orthogonal projection of the first top plate 212 on the back plate 110 and the orthogonal projection of the first main body 311 on the back plate 110 to be non-overlapping, interference between the first circuit board 310 connected to the first light source 131 and the first frame 210 during assembly of the backlight module can be avoided. In addition, during assembly of the backlight module, the second light source 132 can be inserted obliquely between the second top plate 222 and the back plate 110, and even if the orthogonal projection of the second top plate 222 on the back plate 110 and the orthogonal projection of the second main body 321 on the back plate 110 exist, it will not affect the assembly.

[0150] According to some example embodiments, with reference to FIGS. 5A and 6A, the first main body 311 is located between the first light source 131 and the back plate 110, the orthogonal projection of the first light source 131 on the back plate 110 is located within the orthogonal projection of the first main body 311 on the back plate 110, the orthogonal projection of the first main body 311 on the back plate 110 partially overlaps the orthogonal projection of the light guide plate 120 on the back plate 110, and the first main body 311 is adhered to the side of the light guide plate 120 close to the back plate 110 by the second adhesive 152. For example, the second adhesive 152 includes a plurality of second adhesive portions 152a spaced apart along the second direction Y, and the first main body 311 is adhered to the side of the light guide plate 120 close to the back plate 110 by the plurality of second adhesive portions 152a.

[0151] According to some example embodiments, with reference to FIGS. 5B and 6B, the second main body 321 is located between the second light source 132 and the back plate 110, the orthogonal projection of the second light source 132 on the back plate 110 is located within the orthogonal projection of the second main body 321 on the back plate 110, the orthogonal projection of the second main body 321 on the back plate 110 partially overlaps the orthogonal projection of the light guide plate 120 on the back plate 110, and the second main body 321 is adhered to the side of the light guide plate 120 close to the back plate 110 by the third adhesive 153. For example, the third adhesive 153 includes a plurality of third adhesive portions 153a spaced apart along the second direction Y, and the second main body 321 is adhered to the side of the light guide plate 120 close to the back plate 110 by the plurality of third adhesive portions 153a.

[0152] According to some exemplary embodiments, referring to FIG. 5A, the gap G1 between the orthographic projection of the first top plate 212 on the back plate 110 and the orthographic projection of the first main body portion 311 on the back plate 110 needs to be greater than or equal to a predetermined distance, which can be set in reference to the assembly accuracy of the first circuit board 310 and the molding accuracy of the first frame 210, for example, the assembly accuracy of the first circuit board 310 is 0.1 mm, and the molding accuracy of the first frame 210 is 0.05 mm, so the predetermined distance can be set to 0.15 mm. That is, the gap G1 between the orthographic projection of the first top plate 212 on the back plate 110 and the orthographic projection of the first main body portion 311 on the back plate 110 is set to be greater than or equal to 0.15 mm, and in this way, interference between the first circuit board 310 and the first top plate 212 during assembly can be avoided, and at the same time, the size D3 of the first top plate 212 along the first direction X is made as large as possible.

[0153] According to some exemplary embodiments, referring to FIGS. 5A, 6A and 6B, the first hollow structure 141 extends from the first side plate 211 to the first top plate 212 and penetrates the first top plate 212 along the first direction X to the edge of the light guide plate 120, that is, as shown in FIG. 6A, the first side plate 211 and the first top plate 212 are completely removed at the position where the first hollow structure 141 is arranged. During assembly, the second connecting portion 322 can be first inserted obliquely between the second top plate 222 and the back plate 110 and passes through the second hollow structure 142 to the outside of the backlight module, and then the light guide plate 120 connected with the light source 130 and the circuit board and other structures is placed on the back plate 110. Since the first hollow structure 141 penetrates from the first side plate 211 to the edge of the first top plate 212 close to the light guide plate 120, that is, the orthographic projection of the first connecting portion 312 on the back plate 110 and the orthographic projection of the first frame 210 on the back plate 110 do not overlap, so that during the process of placing the light guide plate 120 on the back plate 110, the first connecting portion 312 will not interfere with the first frame 210.

[0154] According to some exemplary embodiments, referring to FIG. 6A, the size W1 of the first hollow structure 141 along the second direction Y is greater than the size W2 of the first connecting portion 312 along the second direction Y, for example, the size W1 of the first hollow structure 141 along the second direction Y is greater than the size W2 of the first connecting portion 312 along the second direction Y plus the manufacturing tolerance of the first hollow structure 141 plus the manufacturing tolerance of the first circuit board 310 plus the assembly tolerance of the first circuit board 310.

[0155] According to some exemplary embodiments, referring to FIGS. 7A and 7B, the second hollow structure 142 is located in the second side plate 221, i.e., the second hollow structure 142 is only provided in the second side plate 221 and does not extend further into the second top plate 222 from the second side plate 221. The second hollow structure 142 provided in the second side plate 221 can enable the second connecting portion 322 to be obliquely inserted between the second top plate 222 and the back plate 110 and to pass through the second hollow structure 142 to the outside of the backlight module when assembled, i.e., the strength and support effect of the second bezel 220 can be improved on the basis of meeting the assembly requirements.

[0156] According to some exemplary embodiments, referring to FIG. 7B, the second hollow structure 142 is substantially flush with the plane of the back plate 110 close to the light guide plate 120, i.e., at the second hollow structure 142, the part of the second side plate 221 close to the back plate 110 is completely removed, so that no step structure is formed, so that when the second connecting portion 322 passes out of the second hollow structure 142, there is no blocking structure, thereby improving the assembly yield of the display module.

[0157] According to some exemplary embodiments, referring to FIG. 7A, the dimension W3 of the second hollow structure 142 along the second direction Y is greater than the dimension W4 of the second connecting portion 322 along the second direction Y, for example, the dimension W3 of the second hollow structure 142 along the second direction Y > the dimension W4 of the second connecting portion 322 along the second direction Y + the manufacturing tolerance of the second hollow structure 142 along the second direction Y + the manufacturing tolerance of the second circuit board 320 along the second direction Y + the assembly tolerance of the second circuit board 320 along the second direction Y.

[0158] According to some exemplary embodiments, referring to FIGS. 7A and 7B, the dimension W5 of the second hollow structure 142 along the third direction Z needs to be greater than the dimension of the second connecting portion 322 along the third direction Z, so as to ensure that the second connecting portion 322 can pass out of the second hollow structure 142.

[0159] According to some exemplary embodiments, referring to FIG. 7B, the dimension of the second hollow structure 142 along the third direction Z > the dimension of the second connecting portion 322 along the third direction Z + the manufacturing tolerance of the second hollow structure 142 along the third direction Z + the manufacturing tolerance of the second connecting portion 322 along the third direction Z + the working height. Here, the working height refers to the additional space along the third direction Z that needs to be reserved when the second connecting portion 322 is inserted into the second hollow structure 142. The working height can be understood as the working accuracy of the equipment used to insert the second connecting portion 322 into the second hollow structure 142.

[0160] For example, the dimension W5 of the second hollow structure 142 along the third direction Z can be smaller than the dimension W6 of the side of the second top plate 222 close to the back plate 110 and the side of the back plate 110 close to the second top plate 222 along the third direction Z, i.e. one side close to the second top plate 222 at the second hollow structure 142 still retains a part of the second side plate 221.

[0161] FIG. 6D schematically shows a side view of the first hollow structure in FIG. 6C.

[0162] According to some exemplary embodiments, in combination with reference to FIG. 5E, FIG. 6B, FIG. 6C and FIG. 6D, the first hollow structure 141 comprises a first hollow sub-portion 1411 in the first side plate 211 and a second hollow sub-portion 1412 in the first glue frame 213, the first hollow sub-portion 1411 extends from the side of the first side plate 211 close to the back plate 110 in a direction away from the back plate 110 and penetrates the edge of the first side plate 211 away from the back plate 110, i.e. the first side plate 211 is cut by the first hollow sub-portion 1411 into two parts which are spaced apart along the second direction Y, the second hollow sub-portion 1412 extends from the side of the first glue frame 213 close to the back plate 110 in a direction away from the back plate 110 and penetrates the edge of the first glue frame 213 away from the back plate 110, i.e. the first glue frame 213 is cut by the second hollow sub-portion 1412 into two parts which are spaced apart along the second direction Y. The first hollow sub-portion 1411 and the second hollow sub-portion 1412 are connected to form the first hollow structure 141, at which the first side plate 211 and the first glue frame 213 are completely removed, so that in the process of assembly, the first connecting portion 312 does not interfere with the first bezel 210. FIG. 8 schematically shows an enlarged view of the region A3 in FIG. 4. Among them, FIG. 8 only schematically shows the light guide plate and the first light source located in the region A3.

[0163] According to some exemplary embodiments, in combination with reference to FIG. 4 and FIG. 8, at least one corner of the light guide plate 120 is an inner concave arc-shaped corner 12R, the inner concave arc-shaped corner 12R is concave to the center of the light guide plate 120, the at least one inner concave arc-shaped corner 12R is adjacent to the first light source 131, the orthographic projection of the inner concave arc-shaped corner 12R on the first frame 210 is spaced apart from or tangent to the orthographic projection of the first light source 131 on the first frame 210, that is, the orthographic projection of the light emitting surface 131A of the first light source 131 on the first frame 210 does not overlap with the orthographic projection of the inner concave arc-shaped corner 12R on the first frame 210, therefore, the setting of the inner concave arc-shaped corner 12R basically does not affect the light rays incident into the light guide plate 120 from the first light source 131. In addition, the inventors have found that by setting the corner of the light guide plate 120 as the inner concave arc-shaped corner 12R, the size of the first light incident surface (the plane of the side of the light guide plate 120 close to the first light source 131 except the corner and extending along the second direction Y) of the light guide plate 120 along the second direction Y can be further increased on the basis of meeting the assembly space requirements of the backlight module and the display panel, thereby the size of the first light source 131 along the second direction Y can be improved, and further the brightness of the backlight module can be improved.

[0164] It should be noted that the orthographic projection of the inner concave arc-shaped corner 12R on the first frame 210 is tangent to the orthographic projection of the first light source 131 on the first frame 210 should be understood as: the orthographic projection of the inner concave arc-shaped corner 12R on the first frame 210 does not overlap with the orthographic projection of the first light source 131 on the first frame 210, and a part of the edge of the orthographic projection of the inner concave arc-shaped corner 12R on the first frame 210 coincides with a part of the edge of the orthographic projection of the first light source 131 on the first frame 210.

[0165] It should be noted that the inventors have found that if the corner of the light guide plate 120 is set as an outer convex arc-shaped corner (an arc-shaped corner convex away from the center of the light guide plate 120), then on the basis of meeting the assembly space requirements of the backlight module and the same display panel, the size of the outer convex arc-shaped corner along the second direction Y will be greater than the size of the inner concave arc-shaped corner 12R along the second direction Y, therefore, setting the corner of the light guide plate 120 as the inner concave arc-shaped corner 12R is beneficial to reduce the size of the corner of the light guide plate 120 along the second direction Y, and further the size of the first light incident surface of the light guide plate 120 along the second direction Y can be improved.

[0166] According to some exemplary embodiments, referring to FIG. 8, the first light source 131 includes a plurality of light emitting devices LED spacedly distributed along the second direction Y, the size of the light emitting devices LED along the second direction Y is a first size L1, the pitch of the adjacent light emitting devices LED along the second direction Y is a second size L2, the size of the concave arc-shaped corner 12R along the second direction Y is a third size L3, and the third size L3≤ the first size L1+ the second size L2. That is, within this size range, the size of the concave arc-shaped corner 12R along the second direction Y is not enough to place one more light emitting device LED, so as to maximize the number of light emitting devices LED in the first light source 131.

[0167] According to some exemplary embodiments, at least one of the concave arc-shaped corners 12R is adjacent to the second light source 132, that is, at least one of the two right corners shown in FIG. 4 is a concave arc-shaped corner 12R, and the orthographic projection of the concave arc-shaped corner 12R on the second frame 220 is spaced apart or tangent to the orthographic projection of the second light source 132 on the second frame 220. The concave arc-shaped corner 12R adjacent to the second light source 132 is set in a similar manner to the concave arc-shaped corner 12R adjacent to the first light source 131, which will not be described here.

[0168] For example, the four corners of the light guide plate 120 can all be set as concave arc-shaped corners 12R.

[0169] According to some exemplary embodiments, referring to FIG. 7A and FIG. 8, the second light source 132 includes a plurality of light emitting devices LED spacedly distributed along the second direction Y, and the size of the light emitting devices LED in the second light source 132 is the same as that of the light emitting devices LED in the first light source 131, that is, the size of the concave arc-shaped corner 12R adjacent to the second light source 132 can be set with reference to the size of the concave arc-shaped corner 12R adjacent to the first light source 131, which will not be described here.

[0170] According to some exemplary embodiments, referring to FIG. 8, a third light source can be provided on at least one side of the light guide plate along the second direction, and the third light source can include a plurality of light emitting devices spacedly distributed along the first direction (the setting manner of the third light source will be described later), in order to ensure that the size of the third light emitting surface of the third light source along the first direction is larger, the fourth size L4 of the concave arc-shaped corner 12R along the first direction X can be set as ≤ the first size L1+ the second size L2.

[0171] According to some exemplary embodiments, referring to FIG. 5A, the backlight module further comprises a first light source reflecting film 161 located on the side of the first light source 131 away from the back plate 110, a first glue 151 located on the side of the first light source reflecting film 161 away from the back plate 110, and a diffusion film 171 located on the side of the first glue 151 away from the back plate 110, and the diffusion film 171 extends from the side of the first glue 151 away from the back plate 110 to the side of the light guide plate 120 away from the back plate 110. The first light source reflecting film 161 reflects the light emitted by the first light source 131 away from the back plate 110, so that more light can be incident into the light guide plate 120, i.e. the light utilization of the first light source 131 is improved, thereby the brightness of the backlight module can be improved, and meanwhile, the problem of light leakage in the display area of the display panel assembled to the display module can be effectively avoided. In addition, the diffusion film 171 is arranged on the side of the light guide plate 120 away from the back plate 110, i.e. on the light emitting surface 12E of the light guide plate 120, so that the light incident into the light guide plate 120 can be distributed more uniformly.

[0172] According to some exemplary embodiments, referring to FIG. 5A, the side of the first light source reflecting film 161 close to the first side plate 211 is closer to the first side plate 211 than the side of the first light source 131 close to the first side plate 211, so that the first light source reflecting film 161 can reflect more light into the light guide plate 120.

[0173] According to some exemplary embodiments, referring to FIG. 5A, the side of the first light source reflecting film 161 close to the first side plate 211, the side of the first glue 151 close to the first side plate 211, and the side of the diffusion film 171 close to the first side plate 211 are substantially flush in the third direction Z. In the assembling process of the backlight module, the first light source reflecting film 161, the first glue 151, and the diffusion film 171 are assembled into a composite film layer, and the edges are processed into a substantially flush structure, and then the composite film layer is assembled to the light guide plate 120, so that the assembling process can be simplified and the assembling failure rate can be reduced.

[0174] According to some exemplary embodiments, referring to FIG. 5A, the backlight module further comprises a light enhancement film 172 located on the side of the diffusion film 171 away from the back plate 110, and the side of the light enhancement film 172 away from the back plate 110 is substantially flush with the side of the first top plate 212 away from the back plate 110. In this way, the light enhancement film 172 and the first top plate 212 can provide the same support height, so that the display panel assembled to the backlight module can be better supported.

[0175] According to some exemplary embodiments, referring to FIG. 5A, the light enhancement film 172 includes a first light enhancement film 1721 located on the side of the diffusion film 171 away from the back plate 110, and a second light enhancement film 1722 located on the side of the first light enhancement film 1721 away from the back plate 110. The side of the first light enhancement film 1721 close to the first side frame 210 is substantially flush with the side of the diffusion film 171 close to the first side frame 210 in the third direction Z, and the side of the second light enhancement film 1722 close to the first side frame 210 is farther away from the first side frame 210 than the side of the first light source reflection film 161 away from the first side frame 210. The first light enhancement film 1721 includes a first portion 17211 located on the side of the first light source reflection film 161 away from the back plate 110, the side of the first portion 17211 away from the back plate 110 is substantially flush with the side of the first top plate 212 away from the back plate 110, and the side of the first portion 17211 away from the back plate 110 is substantially flush with the side of the second light enhancement film 1722 away from the back plate 110. That is, by designing the thickness of each film layer, the side of the first portion 17211 of the first light enhancement film 1721 away from the back plate 110, the side of the second light enhancement film 1722 away from the back plate 110, and the side of the first top plate 212 away from the back plate 110 can be flush.

[0176] According to some exemplary embodiments, referring to FIG. 5A, the backlight module further includes a light guide plate reflection film 173 located between the light guide plate 120 and the back plate 110.

[0177] According to some exemplary embodiments, referring to FIG. 5B, the display module further includes a second light source reflection film 162 and a fourth adhesive 154, the second light source reflection film 162 is adhered to the side of the second top plate 222 close to the back plate 110 through the fourth adhesive 154, and a portion of the second light source reflection film 162 away from the second side plate 221 extends to the side of the light guide plate 120 away from the back plate 110. The second light source reflection film 162 can reflect the light emitted by the second light source 132 away from the back plate 110, so that more light can enter the inside of the light guide plate 120, that is, the light utilization rate of the second light source 132 is improved, and the brightness of the backlight module can be improved.

[0178] According to some exemplary embodiments, referring to FIG. 5B, the side of the diffusion film 171 close to the second side plate 221 extends to the side of the second light source reflection film 162 away from the back plate 110, the side of the first light enhancement film 1721 close to the second side plate 221 and the side of the second light enhancement film 1722 close to the second side plate 221 are substantially flush in the third direction Z, and the side of the first light enhancement film 1721 close to the second side plate 221 and the side of the second light enhancement film 1722 close to the second side plate 221 are farther away from the second side plate 221 than the side of the second light source reflection film 162 away from the second side plate 221.

[0179] According to some exemplary embodiments, referring to FIGS. 4, 5C and 5D, the backlight module further comprises a third frame 230 and a fourth frame 240 located at two sides of the light guide plate 120 along the second direction Y, respectively, the third frame 230 is provided with the third glue frame 181, and the fourth frame 240 is provided with the fourth glue frame 182. No light source is provided at the third frame 230 and the fourth frame 240, and therefore, the glue frame structure is additionally provided at the third frame 230 and the fourth frame 240, which can improve the strength of the third frame 230 and the fourth frame 240.

[0180] According to some exemplary embodiments, referring to FIG. 5C, the third frame 230 extends along the first direction X and is located at one side of the light guide plate 120 along the second direction Y, the third frame 230 comprises a third side plate 231 and a third top plate 232 connected with each other, the third side plate 231 is connected with the side edge of the back plate 110 located at one side along the second direction Y, the third side plate 231 can be substantially perpendicular to the back plate 110, one side of the third top plate 232 is connected with the side edge of the third side plate 231 away from the back plate 110 and the other side extends in the direction close to the light guide plate 120. The third glue frame 181 is assembled to the third frame 230, the side of the third glue frame 181 away from the light guide plate 120 and the side of the third side plate 231 away from the light guide plate 120 are substantially flush in the third direction Z, and the side of the third glue frame 181 close to the light guide plate 120 is closer to the light guide plate 120 than the side of the third top plate 232 close to the light guide plate 120.

[0181] According to some exemplary embodiments, referring to FIG. 5C, the third glue frame 181 comprises a third glue frame main body part 1811 and a third glue frame protruding part 1812 located at the side of the third glue frame main body part 1811 away from the third top plate 232, the side of the third glue frame main body part 1811 away from the back plate 110 is used to support the display panel assembled to the backlight module, and the third glue frame protruding part 1812 is used to protect the side of the display panel assembled to the backlight module.

[0182] According to some exemplary embodiments, referring to FIGS. 5A and 5C, the distance D7 between the side of the third top plate 232 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z is smaller than the distance D1 between the side of the first top plate 212 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z, and the side of the third glue frame main body part 1811 away from the back plate 110 is substantially flush with the side of the first top plate 212 away from the back plate 110. The dimension D8 of the third top plate 232 along the second direction Y is smaller than the dimension D3 of the first top plate 212 along the first direction X, the third top plate 232 is used to increase the bonding strength between the third frame 230 and the third glue frame 181, and the first top plate 212 is used to support the display panel assembled to the backlight module, and therefore, D8 can be set to be smaller than D3.

[0183] According to some exemplary embodiments, referring to FIGS. 4 and 5C, the third frame 181 is further provided with a first corner frame portion 183 on both sides of the first direction X, the first corner frame portion 183 can be formed integrally with the third frame 181, the side of the first corner frame portion 183 away from the back plate 110 is substantially flush with the side of the third frame protruding portion 1812 away from the back plate 110, and the first corner frame portion 183 is used to protect the corners of the display panel assembled on the backlight module.

[0184] It should be noted that the first corner frame portion 183 shown in FIG. 5C is not located at the position shown by the cutting line CC’ in FIG. 4, and the first corner frame portion 183 is located at the two corners on the upper side shown in FIG. 4.

[0185] According to some exemplary embodiments, referring to FIGS. 4 and 5D, the fourth frame 240 is provided along the first direction X and is located on the side of the light guide plate 120 away from the third frame 230, the fourth frame 240 includes a fourth side plate 241 and a fourth top plate 242 connected with each other, the fourth side plate 241 is connected with the side edge of the back plate 110 on the side of the second direction Y, and the fourth side plate 241 can be substantially perpendicular to the back plate 110, one side of the fourth top plate 242 is connected with the side edge of the fourth side plate 241 away from the back plate 110 and the other side extends in the direction close to the light guide plate 120. The fourth frame 182 is assembled on the fourth frame 240, the side of the fourth frame 182 away from the light guide plate 120 and the side of the fourth side plate 241 away from the light guide plate 120 are substantially flush in the third direction Z, and the side of the fourth frame 182 close to the light guide plate 120 is closer to the light guide plate 120 than the side of the fourth top plate 242 close to the light guide plate 120.

[0186] According to some exemplary embodiments, referring to FIGS. 5C and 5D, the side of the fourth top plate 242 away from the back plate 110 is substantially flush with the side of the third top plate 232 away from the back plate 110, and the side of the fourth frame 182 away from the back plate 110 is substantially flush with the side of the third frame main body portion 1811 away from the back plate 110.

[0187] According to some exemplary embodiments, referring to FIGS. 5C and 5D, the third frame body 1811 has a dimension D9 along the second direction Y that is smaller than a dimension D10 of the fourth frame 182 along the second direction Y. A display panel assembled to the backlight module has a binding area, the binding area of the display panel and the fourth frame 182 are located on the same side, and the display panel has a larger frame width on the side with the binding area. Therefore, the fourth frame 182 has a dimension D10 along the second direction Y that is set to be larger, so as to better match the display panel and provide better support to the side of the display panel with the binding area. The fourth top plate 242 can have the same size as the third top plate 232, and the fourth side plate 241 can have the same size as the third side plate 231.

[0188] It should be noted that, since the binding area in the display panel is located on the fourth frame 182, the display panel has a flexible circuit board connected at the binding area, and if the fourth frame 182 has a protruding portion for protecting the side of the display panel, the protruding portion will interfere with the flexible circuit board on the display panel. Therefore, the fourth frame 182 does not have a protruding portion on the side away from the back plate 110.

[0189] According to some exemplary embodiments, referring to FIGS. 4, 5C and 5D, the fourth frame 182 further has a second corner frame portion 184 on both sides along the first direction X. The second corner frame portion 184 can be integrally formed with the fourth frame 182, and the side of the second corner frame portion 184 away from the back plate 110 is substantially flush with the side of the first corner frame portion 183 away from the back plate 110. The second corner frame portion 184 is used to protect the corners of the display panel assembled to the backlight module.

[0190] It should be noted that the second corner frame portion 184 shown in FIG. 5D is not located at the position shown by the cutting line DD' in FIG. 4, and the second corner frame portion 184 is located at the two lower corners shown in FIG. 4.

[0191] FIG. 9 schematically shows a flowchart of the assembly process of the backlight module according to some embodiments of the present disclosure.

[0192] Referring to FIG. 9, the assembly process of the backlight module shown in FIG. 4 can include the following steps S11-S16.

[0193] In step S11, the glue-iron integrated structure and the light guide plate reflective film are loaded into the assembly equipment, and the assembly equipment assembles the light guide plate reflective film and the glue-iron integrated structure.

[0194] It should be noted that the glue-iron integrated structure includes the back plate, the first frame, the second frame, the third frame, the fourth frame, the third glue frame and the fourth glue frame mentioned above. The back plate, the first frame, the second frame, the third frame and the fourth frame can be an integrally formed structure, the third glue frame is installed on the third frame, and the fourth glue frame is installed on the fourth frame.

[0195] In step S12, the light guide plate, the first light source connected with the first circuit board and the second light source connected with the second circuit board are fed into the assembling equipment, and the assembling equipment assembles the first light source connected with the first circuit board and the second light source connected with the second circuit board to both sides of the light guide plate respectively to obtain a light guide-integrated structure.

[0196] In step S13, one end of the light guide-integrated structure is obliquely inserted into a predetermined position in the glue-iron integrated structure, and then the light guide-integrated structure is placed flat on the glue-iron integrated structure to obtain a backlight module semi-finished product.

[0197] It should be noted that the step of assembling the light guide-integrated structure with the glue-iron integrated structure specifically includes: obliquely inserting one side of the second circuit board of the light guide-integrated structure into the second frame of the glue-iron integrated structure, and making the second connecting part of the second circuit board protrude from the second hollow part in the second frame, and then placing the light guide-integrated structure flat on the side of the light guide plate reflection film away from the back plate. In the process of placing, a part of the first connecting part of the first circuit board will be located in the first hollow part of the first frame and extend out of the glue-iron integrated structure.

[0198] In step S14, the appearance of the backlight module semi-finished product is detected.

[0199] In step S15, the optical film material is assembled on the backlight module semi-finished product to obtain a backlight module.

[0200] It should be noted that the optical film material includes the first light source reflection film, the second light source reflection film, the diffusion film, the first light enhancement film and the second light enhancement film mentioned above.

[0201] In step S16, the backlight module is subjected to a lighting detection.

[0202] FIG. 10 schematically shows a plan view of the dot structure on the light guide plate in the backlight module according to some embodiments of the present disclosure. FIG. 11 schematically shows a distribution density trend graph of the dot structure on the light guide plate in the backlight module according to some embodiments of the present disclosure. In FIG. 11, the leftmost end of the curve represents the distribution density of the first dot closest to the first light source, and the rightmost end of the curve represents the distribution density of the first dot closest to the second light source.

[0203] According to some exemplary embodiments, referring to FIG. 5A and FIG. 10, the light guide plate 120 is provided with a plurality of first dots 410 arranged in an array on the side close to the back plate 110, the plurality of first dots 410 includes first dot portions 410A arranged along the first direction X and second dot portions 410B arranged along the first direction X, the first dot portions 410A are located on the side close to the first light source 131, and the second dot portions 410B are located on the side close to the second light source 132, the size of the first dot portions 410A along the first direction X is substantially the same as the size of the second dot portions 410B along the first direction X. In the first dot portions 410A, the distribution density of the first dots 410 gradually increases along the direction from the first light source 131 to the second light source 132, and in the second dot portions 410B, the distribution density of the first dots 410 gradually decreases along the direction from the first light source 131 to the second light source 132. The plurality of first dots 410 in the first dot portions 410A are mainly used for regulating the propagation direction of the light rays incident into the light guide plate 120 from the first light source 131, and the plurality of first dots 410 in the second dot portions 410B are mainly used for regulating the propagation direction of the light rays incident into the light guide plate 120 from the second light source 132, and by setting the distribution density of the first dots 410 in the first dot portions 410A and the second dot portions 410B respectively, the brightness uniformity of the backlight module can be effectively improved.

[0204] According to some exemplary embodiments, referring to FIG. 10, the plurality of first dots 410 includes a plurality of columns of first dots 410 arranged along the first direction X, and each column of first dots 410 includes a plurality of first dots 410 uniformly and regularly arranged along the second direction Y. In the two columns of first dots 410, the distance between two adjacent first dots 410 in one column of first dots 410 along the second direction Y is equal to the distance between two adjacent first dots 410 in the other column of first dots 410 along the second direction Y. In the first dot portions 410A, the distance between two adjacent columns of first dots 410 along the first direction X gradually decreases along the direction from the first light source 131 to the second light source 132, and in the second dot portions 410B, the distance between two adjacent columns of first dots 410 along the first direction X gradually increases along the direction from the first light source 131 to the second light source 132, thereby realizing the distribution density change trend of the first dots 410 along the direction from the first light source 131 to the second light source 132, as shown in FIG. 11, that the distribution density first increases and then decreases.

[0205] According to some exemplary embodiments, in combination with reference to FIGS. 10 and 11, the inventors have found that, by setting the variation trend of the distribution density of the first dots 410 to exhibit a parabolic variation trend in the direction pointing from the first light source 131 to the second light source 132, the brightness uniformity of the backlight module can be further improved. That is, in the first dot portion 410A, the distribution density of the first dots 410 gradually increases and the increasing rate gradually decreases in the direction away from the first light source 131, and in the second dot portion 410B, the distribution density of the first dots 410 gradually increases and the increasing rate gradually decreases in the direction away from the second light source 132.

[0206] For example, with reference to FIG. 10, in the first dot portion 410A, among the four adjacent columns of first dots 410, the distance between the column of first dots 410 closest to the first light source 131 and the adjacent column of first dots 410 along the first direction X is a first distance S1, the distance between the two columns of first dots 410 in the middle along the first direction X is a second distance S2, and the distance between the column of first dots 410 farthest from the first light source 131 and the adjacent column of first dots 410 along the first direction X is a third distance S3. The difference between the first distance S1 and the second distance S2 is greater than the difference between the second distance S2 and the third distance S3.

[0207] For example, with reference to FIG. 10, in the second dot portion 410B, among the four adjacent columns of first dots 410, the distance between the column of first dots 410 closest to the second light source 132 and the adjacent column of first dots 410 along the first direction X is a fourth distance S4, the distance between the two columns of first dots 410 in the middle along the first direction X is a fifth distance S5, and the distance between the column of first dots 410 farthest from the second light source 132 and the adjacent column of first dots 410 along the first direction X is a sixth distance S6. The difference between the fourth distance S4 and the fifth distance S5 is greater than the difference between the fifth distance S5 and the sixth distance S6.

[0208] It should be noted that the distance between two adjacent dots can be understood as the distance between the orthographic projections of the same vertex of the two dots on the backboard.

[0209] FIG. 12A schematically shows a perspective view of the first dots on the light guide plate in a backlight module according to some embodiments of the present disclosure. FIG. 12B schematically shows a cross-sectional view of the dot structure on the light guide plate in a backlight module according to some embodiments of the present disclosure.

[0210] According to some exemplary embodiments, with reference to FIGS. 10, 12A and 12B, the shape of the first dot 410 includes a triangular pyramid, the first dot 410 includes a first base H1, a first edge M1, a second edge M2 and a third edge M3, the first base H1 is an isosceles triangle, the first edge M1 is connected with the intersection of the two sides of the first base H1, and the first edge M1 is perpendicular to the first base H1, the second edge M2 and the third edge M3 form a first side J1 with the bottom side of the first base H1. The first dot 410 is recessed from the side of the light guide plate 120 close to the back plate 110 to the direction away from the back plate 110, and the first base H1 is substantially flush with the side of the light guide plate 120 close to the back plate 110. In the first dot portion 410A, the first side J1 of the first dot 410 faces the light emitting surface 131A of the first light source 131, and the light rays emitted by the first light source 131 into the light guide plate 120 can further be totally reflected when further emitted to the first side J1, and the light rays reflected by the first side J1 can propagate to the light emitting surface 12E of the light guide plate 120 and pass through the light emitting surface 12E of the light guide plate 120 to be emitted out of the backlight module. In the second dot portion 410B, the first side J1 of the first dot 410 faces the light emitting surface 132A of the second light source 132, and the light rays emitted by the second light source 132 into the light guide plate 120 can further be totally reflected when further emitted to the first side J1, and the light rays reflected by the first side J1 can propagate to the light emitting surface 12E of the light guide plate 120 and pass through the light emitting surface 12E of the light guide plate 120 to be emitted out of the backlight module. By setting the structure and orientation of the first dot 410, the brightness and brightness uniformity of the backlight module can be effectively improved.

[0211] It is further explained that the first base H1 is substantially flush with the side of the light guide plate 120 close to the back plate 110, which means that the first base H1 is flush with the part of the side of the light guide plate 120 close to the back plate 110 which is not provided with the first dot 410.

[0212] According to some exemplary embodiments, with reference to FIGS. 10 and 12A, in the first dot portion 410A, the side K1 connecting the first side J1 and the first base H1 is parallel to the light emitting surface 131A of the first light source 131, and in the second dot portion 410B, the side K1 connecting the first side J1 and the first base H1 is parallel to the light emitting surface 132A of the second light source 132.

[0213] The inventors have further found that when the first dot 410 is arranged according to the structure shown in FIG. 10, a dark band extending along the second direction Y will be formed at the junction of the first dot portion 410A and the second dot portion 410B, and the dark band can be effectively eliminated by adjusting the arrangement angle of the first dot 410.

[0214] FIG. 12C schematically shows a plan view of the dot structure on the light guide plate in the backlight module according to some embodiments of the present disclosure.

[0215] According to some exemplary embodiments, in combination with reference to FIG. 4, FIG. 12A and FIG. 12C, in the first dot portion 410A, the first side J1 of the first dot 410 faces the light exit surface 131A of the first light source 131 and the third frame 230, and the included angle between the side K1 where the first side J1 connects with the first bottom H1 and the light exit surface 131A of the first light source 131 is the first included angle a1. In the second dot portion 410B, the first side J1 of the first dot 410 faces the light exit surface 132A of the second light source 132 and the fourth frame 240, and the included angle between the side K1 where the first side J1 connects with the first bottom H1 and the light exit surface 132A of the second light source 132 is the second included angle a2. The first included angle a1 and the second included angle a2 are substantially equal, and the first included angle a1 and the second included angle a2 are acute angles. By rotating the first dot 410 in the first dot portion 410A and the first dot 410 in the second dot portion 410B counterclockwise and clockwise respectively by a certain angle, more light can be emitted to the junction area of the first dot portion 410A and the second dot portion 410B, thereby effectively avoiding dark band defects at this position.

[0216] It is also to be noted that the rotation direction of the first dot 410 in the first dot portion 410A and the rotation direction of the first dot 410 in the second dot portion 410B can be reversed, i.e., the first side J1 of the first dot 410 in the first dot portion 410A faces the light exit surface 131A of the first light source 131 and the fourth frame 240, and the first side J1 of the first dot 410 in the second dot portion 410B faces the light exit surface 132A of the second light source 132 and the third frame 230, which can achieve substantially the same improvement effect.

[0217] According to some exemplary embodiments, the size of the first included angle a1 and the second included angle a2 depends on the first light source 131, the second light source 132 and the model of the light guide plate, for example, when the beam angle of the light emitted by the light emitting device LED in the first light source 131 and the second light source 132 is 120°, and the thickness of the light guide plate 120 perpendicular to the light exit surface of the light guide plate 120 is greater than the size of the first light source 131 and the second light source 132 perpendicular to the light exit surface of the light guide plate 120, the first included angle a1 and the second included angle a2 can be set to 25°-35°, and exemplarily, the first included angle a1 and the second included angle a2 are both 30°.

[0218] According to some exemplary embodiments, referring to FIGS. 12A and 12B, the first bottom surface H1 has an obtuse top angle β1, and the included angle β2 between the first bottom surface H1 and the first side surface J1 is 45°. In this way, the first side surface J1 has a larger area and is at a suitable angle, which is conducive to further improving the brightness and brightness uniformity of the backlight module.

[0219] According to some exemplary embodiments, referring to FIGS. 12A and 12B, the first bottom surface H1 has an obtuse top angle β1, and the included angle β2 between the first bottom surface H1 and the first side surface J1 is 45°. In this way, the first side surface J1 has a larger area and is at a suitable angle, which is conducive to further improving the brightness and brightness uniformity of the backlight module.

[0220] FIG. 13 schematically shows a plan view of a backlight module according to some embodiments of the present disclosure. FIG. 14A schematically shows a cross-sectional view taken along line GG' in FIG. 13. FIG. 14B schematically shows a cross-sectional view taken along line HH' in FIG. 13.

[0221] According to some exemplary embodiments, referring to FIG. 13, the display module includes a first light source 131 and a second light source 132 located on both sides of the light guide plate 120 along the first direction X, and the backlight module includes a first frame 210 and a second frame 220 connected on both sides of the back plate 110 along the first direction X. The cross-sectional structure at the first frame 210 and the first light source 131 can refer to FIG. 5A or FIG. 5E, and the cross-sectional structure at the second frame 220 and the second light source 132 can refer to FIG. 5B, which will not be described here.

[0222] Referring to FIGS. 13 and 14A, the light guide plate 120 further includes a third light incident surface 12C located on one side of the light guide plate 120 along the second direction Y. The backlight module further includes a third light source 133 and a third frame 230. The third light source 133 is located on one side of the light guide plate 120 along the second direction Y, and the light emitting surface 133A of the third light source 133 faces the third light incident surface 12C and is arranged to emit light into the light guide plate 120 from the third light incident surface 12C.

[0223] The third side plate 231 is connected to the side of the back plate 110 away from the third light source 133, and the third side plate 231 can be substantially perpendicular to the back plate 110. The third top plate 232 is connected to the side of the third side plate 231 away from the back plate 110 on one side and extends in the direction close to the light guide plate 120 on the other side, and the third top plate 232 is substantially parallel to the back plate 110. The third top plate 232, the third side plate 231 and the back plate 110 form a U-shaped structure, which can be used to support one side of the display panel when the backlight module is assembled with the display panel.

[0224] Referring to FIGS. 5A, 5B and 14A, the distance D11 between the side of the third top plate 232 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z is substantially equal to the distance D1 between the side of the first top plate 212 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z and the distance D2 between the side of the second top plate 222 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z, that is, the side of the third top plate 232 away from the back plate 110 is substantially at the same height as the side of the first top plate 212 away from the back plate 110 and the side of the second top plate 222 away from the back plate 110. The size D12 of the third top plate 232 along the second direction Y is less than the size D4 of the second top plate 222 along the first direction X, and the size D12 of the third top plate 232 along the second direction Y can be equal to the size D3 of the first top plate 212 along the first direction X. The orthogonal projection of the third top plate 232 on the back plate 110 is spaced apart from the orthogonal projection of the third light source 133 on the back plate 110.

[0225] It should be noted that the structure design at the third side frame 230 is substantially the same as the structure design at the first side frame 210, so that the third light source 133 does not interfere with the third side frame 230 during assembly of the backlight.

[0226] According to some exemplary embodiments, referring to FIGS. 13 and 14A, the backlight module further comprises a third circuit board 330, the third circuit board 330 comprises a third main body 331, the third main body 331 is arranged along the first direction X, the third main body 331 is electrically connected with the third light source 133, and the third main body 331 is configured to input a light-emitting control signal to the first light source 131 to drive the third light source 133 to emit light. The orthographic projection of the third top plate 232 on the back plate 110 is spaced apart from the orthographic projection of the third main body 331 on the back plate 110. By arranging the orthographic projection of the third top plate 232 on the back plate 110 and the orthographic projection of the third main body 331 on the back plate 110 to be non-overlapping, interference between the third circuit board 330 connected to the third light source 133 and the third side frame 230 during assembly of the backlight module can be avoided.

[0227] According to some exemplary embodiments, referring to FIG. 14A, the third main body 331 is located between the third light source 133 and the back plate 110, the orthographic projection of the third light source 133 on the back plate 110 is located within the orthographic projection of the third main body 331 on the back plate 110, the orthographic projection of the third main body 331 on the back plate 110 partially overlaps with the orthographic projection of the light guide plate 120 on the back plate 110, and the third main body 331 is adhered to the side of the light guide plate 120 close to the back plate 110 by the fifth adhesive 155.

[0228] It should be understood that, referring to FIGS. 13 and 14A, the third circuit board 330 also comprises a third connecting portion 332 connected with the third main body 331, the third side frame 230 is also provided with a third hollow structure, and the third connecting portion 332 extends from the third hollow structure. The specific structure of the third connecting portion 332 and the third hollow structure can be arranged by referring to the first connecting portion 312 and the first hollow structure 141 located in the first side frame 210, which will not be described here again.

[0229] According to some exemplary embodiments, referring to FIGS. 13 and 14B, the backlight module further comprises a fourth side frame 240, the fourth side frame 240 is located on the side of the light guide plate 120 away from the third side frame 230, and the fourth side frame 240 is arranged along the first direction X. The fourth side frame 240 comprises a fourth side plate 241 and a fourth top plate 242. The fourth side plate 241 is connected with the side edge of the back plate 110 away from the third side frame 230, and the fourth side plate 241 can be arranged substantially perpendicular to the back plate 110. One side of the fourth top plate 242 is connected with the side edge of the fourth side plate 241 away from the back plate 110, and the other side of the fourth top plate 242 extends in the direction close to the light guide plate 120, and the fourth top plate 242 can be arranged substantially parallel to the back plate 110. The fourth top plate 242, the fourth side plate 241 and the back plate 110 form a U-shaped structure, which can be used to support one side of the display panel when the backlight module is assembled with the display panel.

[0230] With reference to FIGS. 5B and 14B, the fourth top plate 242 has a dimension D13 along the second direction Y smaller than a dimension D4 of the second side plate 221 along the first direction X, and a normal projection of the fourth top plate 242 on the back plate 110 is spaced apart from a normal projection of the light guide plate 120 on the back plate 110, so that interference between the fourth side frame 240 and the light guide plate 120 can be avoided during assembly of the backlight module.

[0231] According to some example embodiments, with reference to FIGS. 14A and 14B, a spacing D14 along the third direction Z between a side of the fourth top plate 242 away from the back plate 110 and a side of the back plate 110 close to the light guide plate 120 is substantially equal to a spacing D11 along the third direction Z between a side of the third top plate 232 away from the back plate 110 and a side of the back plate 110 close to the light guide plate 120, i.e., the side of the fourth top plate 242 away from the back plate 110 is at substantially the same height as the side of the third top plate 232 away from the back plate 110, the fourth top plate 242 can support a display panel assembled to the backlight module, and a glue frame structure can not be arranged at the fourth side frame 240, so that manufacturing cost of the backlight module can be reduced.

[0232] FIG. 14C schematically shows an enlarged view of the region A4 in FIG. 13. In FIG. 14C, only the light guide plate, the first light source and the third light source located in the region A4 are schematically shown.

[0233] According to some example embodiments, with reference to FIGS. 13 and 14C, at least one corner of the light guide plate 120 adjacent to the third light source 133 is an inwardly recessed arc-shaped corner 12R (for example, the corner between the first light source 131 and the third light source 133 schematically shown in FIG. 14C), a normal projection of the inwardly recessed arc-shaped corner 12R on the third side frame 230 is spaced apart from or tangent to a normal projection of the third light source 133 on the third side frame 230, i.e., a normal projection of a light emitting surface 133A of the third light source 133 on the third side frame 230 does not overlap with a normal projection of the inwardly recessed arc-shaped corner 12R on the third side frame 230, and thus, the inwardly recessed arc-shaped corner 12R has substantially no influence on the third light source 133 to incident light into the light guide plate 120. In addition, the inventors have found that, by arranging the corner of the light guide plate 120 as the inwardly recessed arc-shaped corner 12R, the third light source 133 can have a larger dimension along the second direction Y, and the third light entrance surface (a plane extending along the second direction Y on the side of the light guide plate 120 close to the third light source 133 except the corner) of the light guide plate 120 can have a larger dimension along the second direction Y, so that the brightness of the backlight module can be improved.

[0234] According to some exemplary embodiments, referring to FIG. 14C, the third light source 133 includes a plurality of light emitting devices LED distributed along the first direction X at intervals, the size of the light emitting devices LED along the first direction X is a first size L1, the interval of adjacent light emitting devices LED along the first direction X is a second size L2, the size of the concave arc-shaped corner 12R along the first direction X is a fourth size L3, and the fourth size L4≤ the first size L1+ the second size L2. That is, within this size range, the size of the concave arc-shaped corner 12R along the first direction X is not enough to place one more light emitting device LED, so that the number of light emitting devices LED in the third light source 133 can be maximized.

[0235] FIG. 15 schematically shows an assembly flowchart of the backlight module according to some embodiments of the present disclosure.

[0236] Referring to FIG. 5, the assembly process of the backlight module shown in FIG. 13 can include the following steps S21-S26:

[0237] In step S21, the iron frame structure and the light guide plate reflective film are loaded into the assembly equipment, and the assembly equipment assembles the light guide plate reflective film with the iron frame structure.

[0238] It should be noted that the iron frame structure includes the back plate, the first frame, the second frame, the third frame, and the fourth frame mentioned above. The back plate, the first frame, the second frame, the third frame, and the fourth frame can be an integrally formed structure.

[0239] In step S22, the light guide plate, the first light source connected with the first circuit board, the second light source connected with the second circuit board, and the third light source connected with the third circuit board are loaded into the assembly equipment, and the assembly equipment assembles the first light source connected with the first circuit board, the second light source connected with the second circuit board, and the third light source connected with the third circuit board to the outside of the light guide plate respectively to obtain a lamp guide integrated structure.

[0240] In step S23, one end of the lamp guide integrated structure is obliquely inserted into a predetermined position in the iron frame structure, and then the lamp guide integrated structure is placed flat on the iron frame structure to obtain a backlight module semi-finished product.

[0241] It should be noted that the step of assembling the lamp guide integrated structure with the iron frame structure specifically includes: obliquely inserting one side of the second circuit board of the lamp guide integrated structure into the second frame of the iron frame structure, and making the second connecting part of the second circuit board protrude from the second hollow part in the second frame, then placing the lamp guide integrated structure flat on the side of the reflective film away from the back plate. In the process of placing, a part of the first connecting part of the first circuit board will be located in the first hollow part of the first frame and extend outside the glue-iron integrated structure, and a part of the third connecting part of the third circuit board will be located in the third hollow part of the third frame and extend outside the iron frame structure.

[0242] In step S24, appearance detection is performed on the backlight module semi-finished product.

[0243] In step S25, the optical film material is assembled on the backlight module semi-finished product to obtain a backlight module.

[0244] It should be noted that the optical film material includes the first light source reflection film, the second light source reflection film, the diffusion film, the first light enhancement film, the second light enhancement film, and the like mentioned above.

[0245] In step S26, the backlight module is subjected to lighting detection.

[0246] FIG. 16 schematically shows a plan view of the dot structure on the light guide plate in the backlight module according to some embodiments of the present disclosure. FIG. 17 schematically shows a distribution density trend graph of the dot structure on the light guide plate in the backlight module according to some embodiments of the present disclosure. In FIG. 17, the leftmost end of the curve schematically represents the distribution density of the second dot closest to the third light source, and the rightmost end of the curve schematically represents the distribution density of the second dot farthest from the third light source.

[0247] According to some exemplary embodiments, referring to FIGS. 14A and 16, the light guide plate 120 is provided with a plurality of second dots 420 arranged in an array on the side of the light guide plate 120 close to the back plate 110, and the distribution density of the second dots 420 gradually increases in the direction away from the third light source 133. By setting the distribution density of the second dots 420 according to this trend, the brightness uniformity of the backlight module can be effectively improved.

[0248] According to some exemplary embodiments, referring to FIG. 16, the plurality of second dots 420 includes a plurality of rows of second dots 420 arranged along the second direction Y, and each row of second dots 420 includes a plurality of second dots 420 uniformly spaced along the first direction X. In the two rows of second dots 420, the spacing between two adjacent second dots 420 in one row of second dots 420 along the first direction X is equal to the spacing between two adjacent second dots 420 in the other row of second dots 420 along the first direction X, and the spacing between the two adjacent rows of second dots 420 gradually decreases in the direction away from the third light source 133, thereby achieving the distribution density change trend shown in FIG. 17, i.e., the distribution density of the second dots 420 gradually increases in the direction away from the third light source 133.

[0249] According to some exemplary embodiments, referring to FIGS. 16 and 17, the inventors have found through research that, in the direction away from the third light source 133, setting the change trend of the distribution density of the first dots 410 as the nonlinear distribution change trend shown in FIG. 17 can further improve the brightness uniformity of the backlight module. That is, in the direction away from the third light source 133, the distribution density of the second dots 420 gradually increases and the increasing rate gradually increases.

[0250] For example, referring to FIG. 16, in the four rows of second dots 420 adjacent to each other, the distance between the row of first dots 410 closest to the third light source 133 and the adjacent row of first dots 410 is the seventh distance S7, the distance between the two rows of first dots 410 in the middle is the eighth distance S8, and the distance between the row of first dots 410 farthest from the third light source 133 and the adjacent row of first dots 410 is the ninth distance S9. The seventh distance S7 is greater than the eighth distance S8, the eighth distance S8 is greater than the ninth distance S9, and the difference between the seventh distance S7 and the eighth distance S8 is less than the difference between the eighth distance S8 and the ninth distance S9.

[0251] FIG. 18A schematically illustrates a perspective view of the second dots on the light guide plate in a backlight module according to some embodiments of the present disclosure. FIG. 18B schematically illustrates a cross-sectional view of the dot structure on the light guide plate in a backlight module according to some embodiments of the present disclosure.

[0252] According to some exemplary embodiments, with reference to FIGS. 16, 18A and 18B, the shape of the second net dot 420 comprises a triangular pyramid, the second net dot 420 comprises a second base H2, a fourth edge M4, a fifth edge M5 and a sixth edge M6, the shape of the second base H2 is an isosceles triangle, the fourth edge M4 is connected with the intersection of the two legs of the second base H2, and the fourth edge M4 is perpendicular to the second base H2, the fifth edge M5, the sixth edge M6 and the base of the second base H2 enclose a second side J2, the fourth edge M4, the sixth edge M6 and the base of the second base H2 enclose a third side J3, and the fourth edge M4, the fifth edge M5 and the base of the second base H2 enclose a third side J3. The second net dot 420 is recessed from the side of the light guide plate 120 close to the back plate 110 to the direction away from the back plate 110, and the second base H2 is substantially flush with the side of the light guide plate 120 close to the back plate 110. The second side J2 faces the third light source 133, and the side K2 connected with the second base H2 of the second side J2 is parallel to the light emitting surface 133A of the third light source 133. The third side J3 is perpendicular to the second base H2, the third side J3 faces the first light source 131 and the included angle between the third side J3 and the light emitting surface 131A of the first light source 131 is a third included angle a3, the fourth side J4 is perpendicular to the second base H2, the fourth side J4 faces the second light source 132 and the included angle between the fourth side J4 and the light emitting surface 132A of the second light source 132 is a fourth included angle a4, and the third included angle a3 and the fourth included angle a4 are substantially equal. In this way, the third side J3 can reflect the light rays emitted by the first light source 131 into the light guide plate 120 to the direction away from the third light source 133, the fourth side J4 can reflect the light rays emitted by the second light source 132 into the light guide plate 120 to the direction away from the third light source 133, and the second side J2 can reflect the light rays emitted by the third light source 133 into the light guide plate 120 to the direction close to the light emitting surface 12E of the light guide plate 120. Through the arrangement of the second net dot 420, the light rays emitted by the first light source 131, the second light source 132 and the third light source 133 into the light guide plate 120 can be controlled respectively, so that the brightness and the brightness uniformity of the backlight module can be improved.

[0253] It is further explained that the second base H2 is substantially flush with the side of the light guide plate 120 close to the back plate 110, which means that the second base H2 is flush with the part of the side of the light guide plate 120 close to the back plate 110 which is not provided with the second net dot 420.

[0254] According to some exemplary embodiments, with reference to FIGS. 16 and 18A, the top angle β3 of the second base H2 is an acute angle, for example, the top angle β3 of the second base H2 is 60°, and the second base H2 is an equilateral triangle. The inventor has found that setting the top angle β3 of the second base H2 to be an acute angle, so that the third included angle α3 and the fourth included angle α4 are both 30°, can more effectively improve the brightness and brightness uniformity of the backlight module.

[0255] According to some exemplary embodiments, with reference to FIGS. 18A and 18B, the size of the second base H2 along the second direction Y is equal to the length of the fourth edge M4. With this arrangement, the angle β4 between the second side J2 and the second base H2 is 45°, thereby more effectively improving the brightness and brightness uniformity of the backlight module.

[0256] FIG. 19 schematically shows a plan view of a backlight module according to some embodiments of the present disclosure. FIG. 20 schematically shows a cross-sectional view taken along line JJ’ in FIG. 19.

[0257] According to some exemplary embodiments, with reference to FIG. 19, the display module includes a first light source 131 and a second light source 132 located on both sides of the light guide plate 120 along the first direction X, and the backlight plate 110 is connected with a first bezel 210 and a second bezel 220 on both sides along the first direction X. The cross-sectional structure at the first bezel 210 and the first light source 131 can refer to FIG. 5A or FIG. 5E, and the cross-sectional structure at the second bezel 220 and the second light source 132 can refer to FIG. 5B, which will not be described here.

[0258] Continuing to refer to FIG. 19, the display module includes a third light source 133 and a fourth light source 134 located on both sides of the light guide plate 120 along the second direction Y, and the backlight plate 110 is connected with a third bezel 230 and a fourth bezel 240 on both sides along the second direction Y. The cross-sectional structure at the third bezel 230 and the third light source 133 can refer to FIG. 14A, which will not be described here, and the cross-sectional structure at the fourth bezel 240 and the fourth light source 134 is described later.

[0259] With reference to FIGS. 19 and 20, the light guide plate 120 further includes a fourth light-incident surface 12D located on a side of the light guide plate 120 away from the third light-incident surface 12C. The fourth light source 134 is located on one side of the light guide plate 120 along the second direction Y, and the light exit surface of the fourth light source 134 is arranged to face the fourth light-incident surface 12D. The fourth light source 134 emits light into the light guide plate 120 from the fourth light-incident surface 12D.

[0260] The fourth side plate 241 is connected to the side of the back plate 110 away from the fourth light source 134, and the fourth side plate 241 can be substantially perpendicular to the back plate 110. One side of the fourth top plate 242 is connected to the side of the fourth side plate 241 away from the back plate 110, and the other side of the fourth top plate 242 extends in a direction close to the light guide plate 120. The fourth top plate 242 is substantially parallel to the back plate 110, and the fourth top plate 242, the fourth side plate 241 and the back plate 110 form a U-shaped structure. When the backlight module is assembled with the display panel, the U-shaped structure can be used to support one side of the display panel.

[0261] With reference to FIGS. 5A, 5B and 20, the distance D15 between the side of the fourth top plate 242 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z is substantially equal to the distance D1 between the side of the first top plate 212 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z and the distance D2 between the side of the second top plate 222 away from the back plate 110 and the side of the back plate 110 close to the light guide plate 120 along the third direction Z. That is, the side of the fourth top plate 242 away from the back plate 110 is substantially at the same height as the side of the first top plate 212 away from the back plate 110 and the side of the second top plate 222 away from the back plate 110. The size D16 of the fourth top plate 242 along the second direction Y is less than the size D4 of the second top plate 222 along the first direction X, and the size D15 of the fourth top plate 242 along the second direction Y can be equal to the size D3 of the first top plate 212 along the first direction X. The orthogonal projection of the fourth top plate 242 on the back plate 110 is spaced apart from the orthogonal projection of the fourth light source 134 on the back plate 110.

[0262] It should be noted that the structure design at the fourth side frame 240 is substantially the same as the structure design at the first side frame 210 and the third side frame 230, so that the fourth light source 134 does not interfere with the fourth side frame 240 during assembly of the backlight.

[0263] According to some exemplary embodiments, referring to FIGS. 13 and 14A, the backlight module further comprises a fourth circuit board 340, the fourth circuit board 340 comprises a fourth main body portion 341, the fourth main body portion 341 is arranged to extend along the first direction X, the fourth main body portion 341 is electrically connected with the fourth light source 134, and the fourth main body portion 341 is configured to input a light-emitting control signal to the fourth light source 134 to drive the fourth light source 134 to emit light. The orthographic projection of the fourth top plate 242 on the back plate 110 is spaced apart from the orthographic projection of the fourth main body portion 341 on the back plate 110. By arranging the orthographic projection of the fourth top plate 242 on the back plate 110 and the orthographic projection of the fourth main body portion 341 on the back plate 110 to be non-overlapping, interference between the fourth circuit board 340 connected to the fourth light source 134 and the fourth frame 240 can be avoided during assembly of the light source 130 and the light guide plate 120.

[0264] According to some exemplary embodiments, referring to FIG. 14A, the fourth main body portion 341 is located between the fourth light source 134 and the back plate 110, the orthographic projection of the fourth light source 134 on the back plate 110 is located within the orthographic projection of the fourth main body portion 341 on the back plate 110, the orthographic projection of the fourth main body portion 341 on the back plate 110 partially overlaps with the orthographic projection of the light guide plate 120 on the back plate 110, and the fourth main body portion 341 is adhered to the side of the light guide plate 120 close to the back plate 110 by the sixth adhesive 156.

[0265] It should be understood that, referring to FIGS. 13 and 14A, the fourth circuit board 340 also comprises a fourth connecting portion connected with the fourth main body portion 341, and the fourth frame 240 is also provided with a fourth hollow structure, and the fourth connecting portion extends out of the fourth hollow structure. The specific structure of the fourth connecting portion and the fourth hollow structure can be arranged by referring to the first connecting portion 312 and the first hollow structure 141 in the first frame 210, which will not be described here again.

[0266] FIG. 21 schematically shows a plan view of a dot structure on a light guide plate in a backlight module according to some embodiments of the present disclosure.

[0267] According to some exemplary embodiments, referring to FIGS. 20 and 21, the side of the light guide plate 120 close to the back plate 110 is provided with a plurality of third dots 430 arranged in an array, and the plurality of third dots 430 are uniformly distributed. The inventors have found that this arrangement is more conducive to improving the brightness uniformity of the backlight module.

[0268] For example, referring to FIG. 21, the plurality of third dots 430 includes a plurality of rows of third dots 430 arranged along the second direction Y, and each row of third dots 430 includes a plurality of third dots 430 uniformly spaced along the first direction X. In two rows of third dots 430, the spacing between two adjacent second dots 420 in one row of third dots 430 along the first direction X is equal to the spacing between two adjacent second dots 420 in another row of third dots 430 along the first direction X. Also, in three adjacent rows of third dots 430, the spacing between two adjacent rows of third dots 430 along the second direction Y is equal to the spacing between two other adjacent rows of third dots 430 along the second direction Y.

[0269] FIG. 22A schematically illustrates a perspective view of third dots on a light guide plate in a backlight module according to some embodiments of the present disclosure. FIG. 22B schematically illustrates a cross-sectional view of a dot structure on a light guide plate in a backlight module according to some embodiments of the present disclosure.

[0270] According to some exemplary embodiments, in combination with reference to FIG. 21, FIG. 22A and FIG. 22B, the shape of the third dot 430 includes a quadrangular pyramid, the third dot 430 includes a third bottom surface H3, the third bottom surface H3 is a rhombus, and the projection of the vertex Q of the third dot 430 away from the third bottom surface H3 on the third bottom surface H3 coincides with the geometric center of the third bottom surface H3. The third dot 430 is recessed away from the back plate 110 by the side of the light guide plate 120 close to the back plate 110, and the third bottom surface H3 is substantially flush with the side of the light guide plate 120 close to the back plate 110. The third bottom surface H3 includes a first diagonal line N1 and a second diagonal line N2, the first diagonal line N1 is parallel to the light emitting surface 131A of the first light source 131 and the light emitting surface 132A of the second light source 132, and the second diagonal line N2 is parallel to the light emitting surface 133A of the third light source 133 and the light emitting surface 134A of the fourth light source 134. In this way, the brightness and brightness uniformity of the backlight module can be further improved.

[0271] It is additionally explained that the third bottom surface H3 being substantially flush with the side of the light guide plate 120 close to the back plate 110 should be understood as the third bottom surface H3 being flush with the part of the side of the light guide plate 120 close to the back plate 110 where no third dot 430 is arranged.

[0272] According to some exemplary embodiments, referring to FIG. 21, the size of the light guide plate 120 along the second direction Y is less than the size of the light guide plate 120 along the first direction X, the length of the light emitting surface 131A of the first light source 131 along the second direction Y and the length of the light emitting surface 132A of the second light source 132 along the second direction Y are less than the length of the light emitting surface 133A of the third light source 133 along the second direction Y and the length of the light emitting surface 134A of the fourth light source 134 along the second direction Y, based on which the length of the first diagonal line N1 is set to be less than the length of the second diagonal line N2, which can further improve the brightness and brightness uniformity of the backlight module.

[0273] According to some exemplary embodiments, referring to FIG. 21, FIG. 22A and FIG. 22B, the third net point 430 includes a seventh edge M7 and an eighth edge M8, the seventh edge M7 and the eighth edge M8 coincide with the second diagonal line N2 in the orthographic projection of the third bottom surface H3, the angle between the seventh edge M7 and the third bottom surface H3 is 45°, and the angle between the eighth edge M8 and the third bottom surface H3 is 45°. In this way, the brightness and brightness uniformity of the backlight module can be further improved.

[0274] According to some exemplary embodiments, referring to FIG. 21 and FIG. 22A, one of the top angles β5 of the third bottom surface H3 can be 120°, i.e., the angle of the top angle β5 opposite to the second diagonal line N2 is 120°. The third bottom surface H3 includes a first bottom edge H31, a second bottom edge H32, a third bottom edge H33 and a fourth bottom edge H34, the first bottom edge H31 is located close to the first light source 131 and the third light source 133, the second bottom edge H32 is located close to the second light source 132 and the third light source 133, the third bottom edge H33 is located close to the first light source 131 and the fourth light source 134, and the fourth bottom edge H34 is located close to the second light source 132 and the fourth light source 134. The angle between the first bottom edge H31 and the light emitting surface 131A of the first light source 131 is 60°, the angle between the second bottom edge H32 and the light emitting surface 132A of the second light source 132 is 60°, the angle between the first bottom edge H31 and the light emitting surface 133A of the third light source 133 is 30°, the angle between the third bottom edge H33 and the light emitting surface of the fourth light source 134 is 30°, in this way, the brightness and brightness uniformity of the backlight module can be further improved.

[0275] FIG. 23A schematically shows a cross-sectional view of a display device according to some embodiments of the present disclosure.

[0276] Some embodiments of the present disclosure further provide a display device, the display device comprising a display panel PNL and a backlight module BLU as described above, referring to FIG. 23A, the display panel PNL is located at one side of the light emitting surface of the backlight module BLU, and the display panel PNL can be adhered to the backlight module BLU by a first adhesive layer 61, the first adhesive layer 61 is in the shape of a mouth, and the first adhesive layer 61 is arranged around the display area of the display panel PNL.

[0277] It should be noted that FIG. 23A only schematically shows the structure of the display device located at the side of the first frame 210 of the backlight module BLU, and at the frames on the other sides, the first adhesive layer 61 is adhered and fixed at the frame of the backlight module BLU.

[0278] According to some exemplary embodiments, referring to FIG. 23A, the display device further comprises a cover plate CG and a support strip 62, the cover plate CG is adhered to the side of the display panel PNL away from the backlight module BLU by an optical adhesive layer OCA, the edge of the optical adhesive layer OCA protrudes from the edge of the display panel PNL, and the edge of the cover plate CG protrudes from the edge of the optical adhesive layer OCA. One side of the first adhesive layer 61 extends to the side of the first top plate 212 away from the back plate 110 and is adhered to the first top plate 212, the other side of the first adhesive layer 61 extends to the side of the second top plate away from the back plate and is adhered to the second top plate, and the support strip 62 is located between the first adhesive layer 61 and the optical adhesive layer OCA, and the orthographic projection of the support strip 62 on the back plate 110 at least partially overlaps the orthographic projection of the first top plate 212 on the back plate 110. By increasing the support strip 62, on the one hand, the edge of the cover plate CG can be supported, and on the other hand, the support strip 62 can fix the first adhesive layer 61 located on the lower side, increase the adhesion strength between the first adhesive layer 61 and the first top plate 212, and avoid the problem of the first adhesive layer 61 separating from the first top plate 212 and causing the display panel PNL and the backlight module BLU to separate due to shrinkage of the first adhesive layer 61 or impact during use of the display device.

[0279] According to some exemplary embodiments, the material of the support strip 62 can include an organic polymer material, for example, the material of the support strip 62 can include polyethylene terephthalate.

[0280] FIG. 23B schematically shows a cross-sectional view of a display device according to some embodiments of the present disclosure.

[0281] According to some exemplary embodiments, referring to FIG. 23B, the first side frame 210 includes the first side plate 211 and the first glue frame 213, one side of the first glue layer 61 extends to the side of the first glue frame 213 away from the back plate 110 and adheres to the first glue frame 213. The orthographic projection of the support strip 62 on the back plate 110 at least partially overlaps the orthographic projection of the first glue frame 213 on the back plate 110. By increasing the support strip 62, on the one hand, the edge of the cover plate CG can be supported, and on the other hand, the support strip 62 can fix the first glue layer 61 located on the lower side, increase the bonding strength between the first glue layer 61 and the first glue frame 213, and avoid the problem of the first glue layer 61 separating from the first glue frame 213 and causing the display panel PNL and the backlight module BLU to separate due to shrinkage of the first glue layer 61 or impact during use of the display device.

[0282] It should be noted that when the backlight module in the display device adopts the backlight module shown in FIG. 4, the support strip can be arranged above the first side frame, i.e., the structure shown in FIG. 23A or FIG. 23B. When the backlight module in the display device adopts the backlight module shown in FIG. 13, the support strip can be further arranged above the third top plate. When the backlight module in the display device adopts the backlight module shown in FIG. 19, the support strip can be arranged above the third top plate and the fourth top plate. The support strips located on the third top plate and the fourth top plate can be arranged as shown in FIG. 23A, which will not be described here.

[0283] According to some exemplary embodiments, referring to FIG. 23A, the display panel PNL includes the first polarizing layer 51, the array substrate 52, the color film substrate 53, and the second polarizing layer 54, the first polarizing layer 51 is located on the backlight module BLU, the array substrate 52 is located on the side of the first polarizing layer 51 away from the backlight module BLU, the color film substrate 53 is located on the side of the array substrate 52 away from the backlight module BLU, and the second polarizing layer 54 is located on the side of the color film substrate 53 away from the back plate 110. The side of the support strip 62 away from the backlight module BLU is closer to the backlight module BLU than the side of the color film substrate 53 away from the backlight module BLU, and the side of the support strip 62 away from the backlight module BLU is farther away from the backlight module BLU than the side of the color film substrate 53 close to the backlight module BLU. The inventors have found that by setting the support height of the support strip 62 in this way, the cover plate CG can be better supported.

[0284] According to some exemplary embodiments, the display device further comprises an encapsulation tape 63, one end of the encapsulation tape 63 is attached to the side of the display panel PNL away from the backlight module BLU, and the other end extends to the side of the back plate 110 away from the light guide plate 120 via the support strip 62 away from the side of the first side plate 211 away from the side of the light guide plate 120. The encapsulation tape 63 wraps the display panel PNL, the support strip 62 and the backlight module BLU, which can further reduce the risk of separation of the display panel PNL and the backlight module BLU.

[0285] According to some exemplary embodiments, referring to FIG. 23A, the first polarizing layer 51 is substantially flush with the side of the support strip 62, the array substrate 52 is substantially flush with the side of the support strip 62, and the color film substrate 53 is substantially flush with the side of the support strip 62, the second polarizing layer 54 is farther away from the support strip 62 than the color film substrate 53 is, and one end of the encapsulation tape 63 is attached to the side of the color film substrate 53 away from the array substrate 52. The thickness of the encapsulation tape 63 can be similar to or less than the thickness of the second polarizing layer 54, so as not to affect the bonding strength of the optical adhesive layer OCA between the display panels PNL.

[0286] It should be noted that the encapsulation tape can be provided at the side with the support strip, or can also be provided at other sides of the display device, so as to further reduce the risk of separation of the display panel from the backlight module.

[0287] FIG. 24 schematically shows a plan view of a display device according to some embodiments of the present disclosure.

[0288] Referring to FIG. 24, in the display device, the display panel PNL includes a display area AA and a peripheral area NA located at the display area AA, the display panel PNL includes a drive chip IC located at the peripheral area NA, and the drive chip IC is located at one side of the display area AA along the second direction Y. The backlight module BLU can adopt the backlight module BLU schematically shown in FIG. 4, the first light source 131 and the second light source 132 in the backlight module BLU are located at two sides along the first direction X, and the arrangement area of the first light source 131 and the second light source 132 in the backlight module BLU and the arrangement area of the drive chip IC do not overlap.

[0289] The inventors have found through research that arranging the light source 130 in the backlight module BLU and the drive chip IC in the display panel PNL at different sides can increase the brightness of the backlight module BLU while reducing the temperature rise of the backlight module BLU during operation. The verification process and structure are described later.

[0290] The display device one and the display device two are prepared by using the following steps:

[0291] A display panel is provided, and the ratio of the size of the display area AA of the display panel along the first direction X to the size along the second direction Y is 3:2, as shown in FIG. 24.

[0292] A backlight module one and a backlight module two are provided. The backlight module one has the structure shown in FIG. 1, and the light source 130 of the backlight module one is arranged on one side along the second direction Y. The backlight module two has the structure shown in FIG. 4 and FIG. 24, and the backlight module two includes a first light source 131 and a second light source 132, and the first light source 131 and the second light source 132 are located on both sides along the first direction X. The backlight module one and the backlight module two are the same in other structures and models, and the difference is only in the number and the arrangement position of the light source 130. The light source in the backlight module one and the light source in the backlight module two are both composed of the same model of light-emitting diode (LED).

[0293] The backlight module one and the display panel are assembled to obtain a display device one, and in the display device one, the driving chip IC of the display panel and the light source 130 of the backlight module one are located on the same side along the second direction Y (which can be referred to the structure shown in FIG. 1). The backlight module two and the display panel are assembled to obtain a display device two.

[0294] The backlight module one and the backlight module two are subjected to temperature rise test, and the display device one and the display device two are subjected to temperature rise test. The test structure is shown in Table 1 and Table 2.

[0295] Table 1

[0296] According to the data in Table 1, compared with the backlight module one in which the light source is arranged on one side, the backlight module two has light sources arranged on both sides, and the number of LEDs in the light source is increased. In the case that the current of the LED is unchanged, the center brightness of the backlight module two is improved compared with the center brightness of the backlight module one. Meanwhile, if the current of the LED is further increased, the center brightness of the backlight module two can be further improved.

[0297] Table 2

[0298] According to the data in Table 2, compared with the display device one, since the backlight module two in the display device two has the light source and the driving chip arranged on different sides, the heat generated by the driving chip in the working process does not cause the temperature of the backlight module to rise. Therefore, under the same brightness, the temperature rise of the backlight module two in the display device two is obviously reduced. Meanwhile, even if the brightness of the backlight module two is further improved, the temperature rise of the backlight module two is still less than the temperature rise of the backlight module one.

[0299] FIG. 25 schematically shows a plan view of a display device according to some embodiments of the present disclosure.

[0300] Referring to FIG. 25, in the display device, the display panel includes a display area AA and a non-display area NA located at a periphery of the display area AA, the display panel includes a driving chip IC located at the non-display area NA, and the driving chip IC is located at one side of the display area AA along a second direction Y. The backlight module can adopt the backlight module shown in FIG. 13, the first light source 131 and the second light source 132 in the backlight module are located at two sides along the first direction X, the third light source 133 and the driving chip IC are respectively located at two sides along the second direction Y, and the setting area of the first light source 131, the second light source 132 and the third light source 133 in the backlight module and the setting area of the driving chip IC do not overlap.

[0301] The inventor has found through research that the light source in the backlight module and the driving chip in the display panel are arranged at different sides, which can increase the brightness of the backlight module and reduce the temperature rise of the backlight module in the working process. The verification process and structure are described below.

[0302] The display device one and the display device three are prepared by using the following steps:

[0303] A display panel is provided, referring to FIG. 25, the ratio of the size of the display area AA of the display panel along the first direction X to the size along the second direction Y is 3:2.

[0304] A backlight module one and a backlight module three are provided, the structure of the backlight module one is shown in the backlight module in FIG. 1, the light source 130 of the backlight module one is arranged at one side along the second direction Y, the structure of the backlight module three is shown in FIG. 13 and FIG. 25, the backlight module includes the first light source 131, the second light source 132 and the third light source 133, the first light source 131 and the second light source 132 are located at two sides along the first direction X, and the third light source 133 and the driving chip IC are respectively located at two sides along the second direction Y. The other structures and models of the backlight module one and the backlight module three are the same, and the difference is only in the number and position of the light source 130. The light source 130 in the backlight module one and the light source 130 in the backlight module three are composed of the same model of light-emitting diode (LED).

[0305] The backlight module one and the display panel are assembled to obtain the display device one, in the display device one, the driving chip IC of the display panel and the light source 130 of the backlight module one are located at the same side along the second direction Y (which can refer to the structure shown in FIG. 1), and the backlight module three and the display panel are assembled to obtain the display device three.

[0306] The brightness and temperature rise of the display device one and the display device three are tested, and the test structure is shown in the following Table 3 and Table 4.

[0307] Table 3

[0308] According to the data in Table Three, compared with the backlight module one in which the light source is arranged on one side, the backlight module three in which the light source is arranged on three sides and the number of LEDs in the light source is increased, the center brightness of the backlight module three is improved compared with the center brightness of the backlight module one when the current of the LEDs is unchanged. Meanwhile, the center brightness of the backlight module three can be further improved by further increasing the current of the LEDs.

[0309] Table Four

[0310] According to the data in Table Four, compared with the display device one, since the backlight module three in the display device three arranges the light source and the driving chip on different sides, the heat generated by the driving chip in operation does not cause the temperature of the backlight module to rise, so the temperature rise of the backlight module three in the display device three is significantly reduced under the same brightness. Meanwhile, if the brightness of the backlight module three is further improved, the temperature rise of the backlight module three can still be less than the temperature rise of the backlight module one (depending on the size relationship between K and O, the values of K and O are not the same for different backlight modules and different driving chips).

[0311] As used herein, the terms "substantially," "approximately," "about," and other similar terms are used as terms of approximation and not as terms of degree, and they are intended to account for the inherent deviations in measured or calculated values that would be recognized by those of ordinary skill in the art. In view of the process fluctuations, measurement problems and errors associated with the measurement of a particular quantity (i.e., limitations of the measurement system), etc., "about" or "approximately," as used herein, includes the stated value and means a value that is within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art. For example, "about" can mean within one or more standard deviations, or within ±10% or ±5% of the stated value.

[0312] While some embodiments in accordance with the overall inventive concept of the present disclosure have been illustrated and described, it is to be understood that changes can be made without departing from the principles and spirit of the overall inventive concept of the present disclosure, the scope of which is defined in the claims and their equivalents.

Claims

1. A backlight module, wherein, The backlight module comprises: a back plate; a light guide plate located on the back plate, the light guide plate comprising a first light-in surface, a second light-in surface and a light-out surface, the second light-in surface and the first light-in surface being located on two sides of the light guide plate along a first direction respectively, the light-out surface comprising a side of the light guide plate away from the back plate; a light source comprising a first light source and a second light source, the first light source and the second light source being located on two sides of the light guide plate along the first direction respectively, the light-out surface of the first light source being arranged to face the first light-in surface, and the light-out surface of the second light source being arranged to face the second light-in surface; a first frame extending along a second direction and located on a side of the first light source away from the light guide plate, the first frame being connected to a side of the back plate away from the first light source, the second direction intersecting the first direction; and a second frame extending along the second direction and located on a side of the second light source away from the light guide plate, the second frame being connected to a side of the back plate away from the second light source; wherein a normal projection of the first frame on the back plate is spaced apart from a normal projection of the first light source on the back plate, and a normal projection of the second frame on the back plate covers at least part of a normal projection of the second light source on the back plate.

2. The backlight module of claim 1, wherein, The backlight module further comprises a first circuit board and a second circuit board, the first circuit board comprising a first main body and a first connecting part, the first main body being electrically connected to the first light source, and one end of the first connecting part being electrically connected to the first main body and the other end extending out through a first hollow structure in the first frame; the second circuit board comprising a second main body and a second connecting part, the second main body being electrically connected to the second light source, and one end of the second connecting part being electrically connected to the second main body and the other end extending out through a second hollow structure in the second frame; and a normal projection of the first frame on the back plate is spaced apart from a normal projection of the first main body on the back plate, and a normal projection of the second frame on the back plate at least partially overlaps a normal projection of the second main body on the back plate. The size of the first frame along the first direction is smaller than the size of the second frame along the first direction.

3. The backlight module of claim 2, wherein, The second frame comprises a second side plate and a second top plate, the second side plate being connected to a side edge of the back plate away from the second light source, and one side of the second top plate being connected to a side edge of the second side plate away from the back plate and the other side extending towards the light guide plate, at least part of the second light source being located between the second top plate and the back plate, and / or at least part of the second main body being located between the second top plate and the back plate.

4. The backlight module of claim 3, wherein, ​ 5. The backlight module of claim 4, wherein, The first frame includes a first side plate and a first top plate, the first side plate is connected with the side of the back plate away from the first light source, one side of the first top plate is connected with the side of the first side plate away from the back plate and the other side extends in the direction close to the light guide plate, the size of the first top plate along the first direction is smaller than the size of the second top plate along the first direction, the orthogonal projection of the first top plate on the back plate is spaced from the orthogonal projection of the first light source on the back plate, and the orthogonal projection of the first top plate on the back plate is spaced from the orthogonal projection of the first main body on the back plate.

6. The backlight module of claim 4, wherein, The first frame includes a first side plate and a first top plate, the first side plate is connected with the side of the back plate away from the first light source, one side of the first top plate is connected with the side of the first side plate away from the back plate and the other side extends in the direction close to the light guide plate, the size of the first top plate along the first direction is smaller than the size of the second top plate along the first direction, the orthogonal projection of the first top plate on the back plate is spaced from the orthogonal projection of the first light source on the back plate, and the orthogonal projection of the first top plate on the back plate is spaced from the orthogonal projection of the first main body on the back plate.

7. The backlight module of claim 5, wherein, The first hollow structure extends from the first side plate to the first top plate and penetrates the edge of the first top plate close to the light guide plate along the first direction.

8. The backlight module of claim 6, wherein, The first hollow structure includes a first hollow sub-portion in the first side plate and a second hollow sub-portion in the first glue frame, the first hollow sub-portion extends from the side of the first side plate close to the back plate in the direction away from the back plate and penetrates the edge of the first side plate away from the back plate, the second hollow sub-portion extends from the side of the first glue frame close to the back plate in the direction away from the back plate and penetrates the edge of the first glue frame away from the back plate, and the first hollow sub-portion and the second hollow sub-portion are connected.

9. The backlight module of claim 7 or 8, wherein, The second hollow structure is located in the second side plate, and the side of the second hollow structure away from the back plate is cut off at the side of the second top plate close to the back plate.

10. The backlight module of any of claims 1-9, wherein, At least one of the concave arc corners is adjacent to the first light source, the orthogonal projection of the concave arc corner on the first frame is spaced from or tangent to the orthogonal projection of the first light source on the first frame; and / or, At least one of the concave arc corners is adjacent to the second light source, the orthogonal projection of the concave arc corner on the second frame is spaced from or tangent to the orthogonal projection of the second light source on the second frame. The first light source includes a plurality of light emitting devices distributed along the second direction, and / or the second light source includes a plurality of light emitting devices distributed along the second direction; and 11. The backlight module of claim 10, wherein, ​ The size of the light emitting device along the second direction is a first size, the interval of adjacent light emitting devices along the second direction is a second size, and the size of the concave arc-shaped corner along the second direction is a third size, and the third size is less than or equal to the first size plus the second size.

12. The backlight module of any of claims 1-11, wherein, The backlight module further comprises a first light source reflecting film located on a side of the first light source away from the back plate, a first adhesive located on a side of the first light source reflecting film away from the back plate, and a diffusion film located on a side of the first adhesive away from the back plate, and the diffusion film extends from a side of the first adhesive away from the back plate to a side of the light guide plate away from the back plate.

13. The backlight module of claim 12, wherein, The backlight module further comprises a light enhancement film located on a side of the diffusion film away from the back plate, and a side of the light enhancement film away from the back plate is substantially flush with a side of the first top plate away from the back plate.

14. The backlight module of claim 13, wherein, The light enhancement film comprises a first light enhancement film located on a side of the diffusion film away from the back plate, and a second light enhancement film located on a side of the first light enhancement film away from the back plate, a side of the first light enhancement film close to the first frame is substantially flush with a side of the diffusion film close to the first frame, and a side of the second light enhancement film close to the first frame is farther away from the first frame than a side of the first light source reflecting film away from the first frame. The first light enhancement film comprises a first part located on a side of the first light source reflecting film away from the back plate, a side of the first part away from the back plate is substantially flush with a side of the first top plate away from the back plate, and a side of the first part away from the back plate is substantially flush with a side of the second light enhancement film away from the back plate.

15. The backlight module of any of claims 1-14, wherein, The backlight module further comprises a third frame and a fourth frame located on two sides of the light guide plate along the second direction respectively, the third frame is provided with a third adhesive frame, and / or the fourth frame is provided with a fourth adhesive frame.

16. The backlight module of claim 15, wherein, A side of the light guide plate close to the back plate is provided with a plurality of first mesh points arranged in an array, the plurality of first mesh points comprises a first mesh point part and a second mesh point part arranged along the first direction, the first mesh point part is located on a side close to the first light source, and the second mesh point part is located on a side close to the second light source. In the first mesh point part, the distribution density of the first mesh points gradually increases along a direction from the first light source to the second light source. In the second mesh point part, the distribution density of the first mesh points gradually decreases along a direction from the first light source to the second light source.

17. The backlight module of claim 16, wherein, The plurality of mesh points comprises a plurality of columns of first mesh points arranged along the first direction. In the first dot portion, the interval of the first dots in the first direction gradually decreases along the direction from the first light source to the second light source, and in the four adjacent columns of the first dots, the interval of the first dot column closest to the first light source and the adjacent first dot column in the first direction is a first interval, the interval of the two middle first dot columns in the first direction is a second interval, and the interval of the first dot column farthest from the first light source and the adjacent first dot column in the first direction is a third interval, the difference between the first interval and the second interval is greater than the difference between the second interval and the third interval; And / or In the second dot portion, the interval of the first dots in the first direction gradually increases along the direction from the first light source to the second light source, and in the four adjacent columns of the first dots, the interval of the first dot column closest to the second light source and the adjacent first dot column in the first direction is a fourth interval, the interval of the two middle first dot columns in the first direction is a fifth interval, and the interval of the first dot column farthest from the second light source and the adjacent first dot column in the first direction is a sixth interval, the difference between the fourth interval and the fifth interval is greater than the difference between the fifth interval and the sixth interval.

18. The backlight module of claim 16 or 17, wherein, The shape of the first dot includes a triangular pyramid, the first dot includes a first base, a first edge, a second edge, and a third edge, the first base is an isosceles triangle, the first edge is connected to the intersection of the two sides of the first base, and the first edge is perpendicular to the first base, the second edge and the third edge and the base of the first base form a first side; The first dot is recessed away from the back plate by the side of the light guide plate close to the back plate, and the first base is substantially flush with the side of the light guide plate close to the back plate; And In the first dot portion, the first side of the first dot faces the light emitting surface of the first light source, and in the second dot portion, the first side of the first dot faces the light emitting surface of the second light source.

19. The backlight module of claim 18, wherein, In the first dot portion, the first side of the first dot faces the light emitting surface of the first light source and the third bezel, and the included angle between the side edge of the first side connected to the first base and the light emitting surface of the first light source is a first included angle; and In the second dot portion, the first side of the first dot faces the light emitting surface of the second light source and the fourth bezel, and the included angle between the side edge of the first side connected to the first base and the light emitting surface of the second light source is a second included angle; Wherein, the first included angle and the second included angle are substantially equal, and the first included angle and the second included angle are acute angles.

20. The backlight module of claim 18 or 19, wherein, The top angle of the first base is obtuse; and / or The included angle between the first base and the first side is 45°.

21. The backlight module of any of claims 4-14, wherein, The light guide plate further comprises a third light entrance surface, and the third light entrance surface is located on one side of the light guide plate in the second direction; The backlight module further comprises a third light source and a third frame, the third light source is located at one side of the light guide plate along a second direction, an out-light surface of the third light source is arranged to face the third light-in surface, the third frame is located at a side of the third light source away from the light guide plate, the third frame comprises a third side plate and a third top plate, the third side plate is connected to a side edge of the back plate away from the third light source, one side of the third top plate is connected to a side edge of the third side plate away from the back plate and the other side extends to be arranged in a direction close to the light guide plate; and A dimension of the third top plate along the second direction is less than a dimension of the second top plate along the first direction, a projection of the third top plate on the back plate is spaced apart from a projection of the third light source on the back plate.

22. The backlight module of claim 21, wherein, The backlight module further comprises a fourth frame, the fourth frame is located at a side of the light guide plate away from the third frame; The fourth frame comprises a fourth side plate and a fourth top plate, the fourth side plate is connected to a side edge of the back plate away from the third frame, one side of the fourth top plate is connected to a side edge of the fourth side plate away from the back plate and the other side extends to be arranged in a direction close to the light guide plate; and A dimension of the fourth top plate along the second direction is less than a dimension of the second top plate along the first direction, a projection of the fourth top plate on the back plate is spaced apart from a projection of the light guide plate on the back plate.

23. The backlight module of claim 21 or 22, wherein, The side of the light guide plate close to the back plate is provided with a plurality of second dots arranged in an array, along a direction away from the third light source, a distribution density of the second dots gradually increases.

24. The backlight module of claim 23, wherein, The plurality of second dots comprises a plurality of rows of second dots arranged along the second direction, along a direction away from the third light source, a distance between two adjacent rows of second dots gradually decreases; In the four adjacent rows of second dots, a distance between a first row of second dots closest to the third light source and an adjacent row of second dots is a seventh distance, a distance between two middle rows of second dots is an eighth distance, and a distance between a last row of second dots farthest from the third light source and an adjacent row of second dots is a ninth distance, a difference between the seventh distance and the eighth distance is less than a difference between the eighth distance and the ninth distance.

25. The backlight module of claim 23 or 24, wherein, The shape of the second dot comprises a triangular pyramid, the second dot comprises a second bottom surface, a fourth edge, a fifth edge and a sixth edge, the second bottom surface is in the shape of an isosceles triangle, the fourth edge is connected to an intersection point between two sides of the second bottom surface, and the fourth edge is perpendicular to the second bottom surface, the fifth edge, the sixth edge and a bottom edge of the second bottom surface enclose a second side surface; The second dot is recessed from the side of the light guide plate close to the back plate to a direction away from the back plate, the second bottom surface is substantially flush with the side of the light guide plate close to the back plate; and The second side surface faces the third light source, and a side edge of the second side surface connected to the second bottom surface is parallel to the out-light surface of the third light source.

26. The backlight module of claim 25, wherein, The top angle of the second bottom surface is an acute angle; and / or A dimension of the second bottom surface along the second direction is equal to a length of the fourth edge.

27. The backlight module of any of claims 4-14, wherein, The light guide plate further comprises a third light entrance surface and a fourth light entrance surface, the third light entrance surface and the fourth light entrance surface are respectively located on two sides of the light guide plate along a second direction, the backlight module further comprises a third light source and a fourth light source, the third light source and the fourth light source are respectively located on two sides of the light guide plate along the second direction, the light exit surface of the third light source is arranged to face the third light entrance surface, and the light exit surface of the fourth light source is arranged to face the fourth light entrance surface. The backlight module further comprises a third frame and a fourth frame, the third frame is located on a side of the third light source away from the light guide plate, the third frame comprises a third side plate and a third top plate, the third side plate is connected to a side edge of the back plate away from the third light source, one side of the third top plate is connected to a side edge of the third side plate away from the back plate and the other side extends in a direction close to the light guide plate, and the fourth frame is located on a side of the fourth light source away from the light guide plate, the fourth frame comprises a fourth side plate and a fourth top plate, the fourth side plate is connected to a side edge of the back plate away from the fourth light source, and one side of the fourth top plate is connected to a side edge of the fourth side plate away from the back plate and the other side extends in a direction close to the light guide plate. The third top plate has a dimension along the second direction smaller than a dimension of the second top plate along the first direction, a normal projection of the third top plate on the back plate is spaced apart from a normal projection of the third light source on the back plate, and the fourth top plate has a dimension along the second direction smaller than a dimension of the second top plate along the first direction, a normal projection of the fourth top plate on the back plate is spaced apart from a normal projection of the fourth light source on the back plate.

28. The backlight module of claim 27, wherein, The side of the light guide plate close to the back plate is provided with a plurality of third dots arranged in an array, and the plurality of third dots are uniformly distributed.

29. The backlight module of claim 28, wherein, The shape of the third dot includes a quadrangular pyramid, the third dot includes a third bottom surface, the third bottom surface is a rhombus, and a normal projection of a vertex of the third bottom surface away from the third dot on the third bottom surface coincides with a geometric center of the third bottom surface. The third dot is recessed from the side of the light guide plate close to the back plate to a direction away from the back plate, and the third bottom surface is substantially flush with the side of the light guide plate close to the back plate. The third bottom surface includes a first diagonal line and a second diagonal line, the first diagonal line is parallel to the light exit surface of the first light source and the light exit surface of the second light source, and the second diagonal line is parallel to the light exit surface of the third light source and the light exit surface of the fourth light source.

30. The backlight module of claim 29, wherein, The light guide plate has a dimension along the second direction smaller than a dimension of the light guide plate along the first direction, and a length of the first diagonal line is smaller than a length of the second diagonal line.

31. The backlight module of claim 30, wherein, The third dot includes a seventh edge and an eighth edge, a normal projection of the seventh edge and the eighth edge on the third bottom surface coincides with the second diagonal line, an included angle between the seventh edge and the third bottom surface is 45°, and an included angle between the eighth edge and the third bottom surface is 45°.

32. A display device, wherein the display device comprises a display panel and the backlight module according to any one of claims 1-31, and the display panel is located on one side of the light exit surface of the backlight module.

33. The display device of claim 32, wherein, The display device further comprises: a cover plate located on a side of the display panel away from the backlight module, an edge of the cover plate protruding from an edge of the display panel; a first adhesive layer located between the backlight module and the display panel, one side of the first adhesive layer extending to a side of the first bezel and / or the second bezel away from the back plate; and a support strip located between the first adhesive layer and the cover plate, a projection of the support strip on the back plate at least partially overlapping a projection of the first bezel on the back plate.

34. The display device of claim 33, wherein, The display panel comprises: a first polarizing layer located on the backlight module; an array substrate located on a side of the first polarizing layer away from the backlight module; a color film substrate located on a side of the array substrate away from the backlight module; and a second polarizing layer located on a side of the color film substrate away from the back plate; wherein a side of the support strip away from the backlight module is closer to the backlight module than a side of the color film substrate away from the backlight module.

35. A display device according to claim 28 or 29, wherein, The display device further comprises an encapsulation tape, one end of the encapsulation tape attached to a side of the display panel away from the backlight module, and the other end extending to a side of the back plate away from the light guide plate via a side of the support strip away from the back plate and a side of the first bezel away from the light guide plate. The display device further comprises an encapsulation tape, one end of the encapsulation tape attached to a side of the display panel away from the backlight module, and the other end extending to a side of the back plate away from the light guide plate via a side of the support strip away from the back plate and a side of the first bezel away from the light guide plate.

Images