A backlight module and a display device

Abstract

A backlight module and a display device. The backlight module includes a back plate, a light bar, a light guide plate, and an optical film group. The light bar includes a plurality of light sources disposed toward the light incident surface of the light guide plate. The light exit surface of the light guide plate is adjacent to the light incident surface. A stepped structure is provided on a portion of the light exit surface of the light guide plate close to the light incident surface, and the height of the step in the stepped structure gradually decreases along a first direction. The optical film group includes a plurality of optical films stacked on the side where the light exit surface of the light guide plate is located, and each optical film is fixed to a corresponding step in the stepped structure. The plurality of optical films include a first prism sheet, and the first prism sheet has a plurality of first prisms arranged side by side and extending in a direction perpendicular to the first direction. A notch groove for avoiding the stepped structure is provided at the edge of the first prism sheet, and a gap of 0.5 mm to 0.8 mm is provided between the groove wall of the notch groove of the first prism sheet parallel to the first direction and the stepped structure. The backlight module according to the embodiments of the present disclosure can improve the light emission uniformity of the backlight module.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to, but are not limited to, the field of display technologies, and more particularly to a backlight module and a display device. Background Art

[0002] As a key component in the optoelectronic display industry, a backlight module can provide stable, high-brightness, and evenly distributed light for a liquid crystal display panel (referred to as an LCD panel), thereby enabling the liquid crystal display panel to achieve a display effect. With the development of display technologies, consumers have increasingly higher requirements for the picture quality of display devices. The performance of the backlight module has a great impact on the picture quality of the display device. Therefore, higher requirements are put forward for the backlight module. Summary of the Invention

[0003] Embodiments of the present disclosure provide a backlight module, including a backplane, a light bar, a light guide plate, and an optical film stack; the backplane includes a plate body and a flange provided at a circumferential edge of the plate body, the light guide plate is disposed on one side of the plate body, the light guide plate has a light-emitting surface facing away from the plate body and a light-incident surface adjacent to the light-emitting surface, the light bar is disposed on the flange and includes a plurality of light sources arranged facing the light-incident surface of the light guide plate; a stepped structure is provided on a portion of the light-emitting surface of the light guide plate close to the light-incident surface, and the height of the steps in the stepped structure gradually decreases along a first direction; the optical film stack includes a plurality of optical films stacked on the side where the light-emitting surface of the light guide plate is located, and each optical film is fixed to a corresponding one of the steps in the stepped structure; the plurality of optical films include a first prism sheet, and the surface of the first prism sheet facing away from the light guide plate has a plurality of first prisms arranged side by side, the first prisms extend in a direction perpendicular to the first direction, a notch groove for avoiding the stepped structure is provided at an edge of the first prism sheet, and a gap is provided between a groove wall of the notch groove of the first prism sheet parallel to the first direction and the stepped structure, and the gap is 0.5 mm to 0.8 mm.

[0004] Optionally, the surface of the stepped structure facing away from the plate body is bonded to the plurality of optical films by a light-shielding tape, and notch grooves for avoiding the stepped structure are provided at edges of the plurality of optical films.

[0005] Optionally, the optical film stack includes a first diffusion sheet, the first prism sheet, a second prism sheet, and a second diffusion sheet stacked in sequence on the light-emitting surface of the light guide plate; the surface of the second prism sheet facing away from the light guide plate has a plurality of second prisms arranged side by side, and the second prisms extend in a direction parallel to the first direction.

[0006] Optionally, the flange surrounds circumferential side portions of the light guide plate and the plurality of optical films, and gaps are provided between circumferential edges of the light guide plate and the plurality of optical films and the flange.

[0007] Optionally, the backlight module further includes a plastic frame, which includes a first frame body and a convex rib arranged on the circumferential edge of the first frame body, the first frame body is arranged on the side of the optical film group away from the light guide plate, and the convex rib is arranged around the circumferential side of the retaining edge.

[0008] Optionally, the retaining edge is provided with a plurality of first buckles along the circumferential direction, and the convex rib is provided with a plurality of first slots, and the plurality of first slots are correspondingly engaged with the plurality of first buckles.

[0009] Optionally, the backlight module further comprises a reflective sheet arranged on a side of the light guide plate away from the light emitting surface, the circumferential edge of the reflective sheet is provided with a flange, and the flange is attached to the circumferential side surface of the light guide plate and avoids the light incident surface.

[0010] The embodiment of the present disclosure further provides a display device, comprising a display panel and the backlight module, wherein the backlight module is arranged on a side of the display panel away from the display side.

[0011] Optionally, the display panel includes an array substrate, the array substrate is provided with a binding portion bound to an external circuit board, the binding portion is arranged near a first side of the array substrate, a portion of the array substrate near a second side is provided with a gate driving circuit, the first side of the array substrate is adjacent to the second side, and the light bar is arranged near the first side of the array substrate.

[0012] Optionally, the backlight module also includes a rubber frame, which includes a first frame body and a convex rib arranged on the circumferential edge of the first frame body, the first frame body is arranged on the side of the optical film group away from the light guide plate, and the convex rib is arranged around the circumferential side of the retaining edge; the first frame body is also arranged around the circumferential side of the display panel, the first frame body is provided with a support platform, and the portion of the surface of the display panel away from the display side close to the circumferential edge is bonded to the support platform by a foam double-sided tape.

[0013] Optionally, the display device also includes a front frame fixedly connected to the backlight module, the front frame includes a second frame body surrounded by a circumferential side portion of the plastic frame, and an annular flange connected to the second frame body and located on a side of the first frame body away from the plate body, the annular flange abuts against a surface of the first frame body away from the plate body and against a portion of the display surface of the display panel close to the circumferential edge.

[0014] Optionally, a plurality of second card slots are provided on the second housing along the circumferential direction, and a plurality of second buckles are provided on the retaining edge. The plurality of second buckles pass through the avoidance grooves provided on the rib and are correspondingly clamped with the plurality of second card slots; or / and, a plurality of notch grooves are provided on the second housing, and a plurality of limiting blocks are provided on the rib. The plurality of limiting blocks are correspondingly clamped with the plurality of notch grooves.

[0015] In the backlight module according to the embodiment of the present disclosure, a plurality of optical films of the optical film group cooperate with the stepped structure provided on the light guide plate for limiting. The stepped structure of the light guide plate is provided on a part of the light-emitting surface of the light guide plate close to the light-incident surface, and the height of the steps in the stepped structure gradually decreases along the first direction. The plurality of optical films include a first prism sheet. The surface of the first prism sheet facing away from the light guide plate has a plurality of first prisms arranged side by side. The first prisms extend in a direction perpendicular to the first direction. A notch groove for avoiding the stepped structure is provided at the edge of the first prism sheet. A gap of 0.5 mm to 0.8 mm is provided between the groove wall of the notch groove of the first prism sheet parallel to the first direction and the stepped structure. Due to the existence of the stepped structure on the light guide plate, part of the light emitted by the light source of the light bar will directly enter the stepped structure, and the light emitted from the stepped structure will enter the first prism sheet from the groove wall of the notch groove of the first prism sheet. The first prism sheet will condense the incident light of this part, which will cause bright stripes extending in a direction perpendicular to the first direction at the position corresponding to the stepped structure of the backlight module, resulting in uneven light emission of the backlight module. By providing a gap of 0.5 mm to 0.8 mm between the groove wall of the notch groove of the first prism sheet parallel to the first direction and the stepped structure, in this way, the existence of this gap weakens the intensity of the light incident from the stepped structure into the first prism sheet, thereby reducing the phenomenon of bright stripes generated at the position corresponding to the stepped structure of the light emission of the backlight module and improving the uniformity of the light emission of the backlight module. Description of the Drawings

[0016] The drawings are used to provide a further understanding of the technical solutions of the present disclosure, and constitute a part of the specification. They are used together with the embodiments of the present disclosure to explain the technical solutions of the present disclosure, and do not constitute a limitation to the technical solutions of the present disclosure. The shapes and sizes of the components in the drawings do not reflect the actual scale, and the purpose is only to schematically illustrate the content of the present disclosure.

[0017] Figure 1 Partial exploded structural schematic diagram of a display device for some exemplary embodiments;

[0018] Figure 2 For some exemplary embodiments Figure 1 Exploded structural schematic diagram of the backlight module of the display device;

[0019] Figures 3a to 3d Respectively for some exemplary embodiments Figure 1Schematic cross-sectional structure diagram at four sides of the display device;

[0020] Figure 4 In some exemplary embodiments Figure 2 Schematic structure diagram of the light-emitting surface of the light guide plate of the backlight module;

[0021] Figure 5a In some exemplary embodiments Figure 4 Schematic structure diagram of the cooperation of the light guide plate with four optical films of the optical film group;

[0022] Figure 5b In some exemplary embodiments Figure 5a Schematic structure diagram of the light guide plate and the first prism sheet and the second prism sheet of the optical film group;

[0023] Figure 6 In some exemplary embodiments Figure 4 Schematic structure diagram of the cooperation of the light guide plate with the first prism sheet;

[0024] Figure 7 In some exemplary embodiments Figure 2 Schematic structure diagram of the back plate and the lamp strip of the backlight module;

[0025] Figure 8 In some exemplary embodiments Figure 2 Schematic structure diagram of the glue frame of the backlight module;

[0026] Figure 9 In some exemplary embodiments Figure 1 Schematic structure diagram of the display panel of the display device;

[0027] Figure 10 In some exemplary embodiments Figure 9 Schematic structure diagram of the second circuit board of the display panel;

[0028] Figure 11 In some exemplary embodiments Figure 1 Schematic structure diagram of the front frame of the display device;

[0029] Figure 12 In some exemplary embodiments Figure 11 Top view schematic structure diagram of the front frame;

[0030] Figure 13 In some exemplary embodiments Figure 1 Front side schematic structure diagram of the protective film of the display device;

[0031] Figure 14 In some exemplary embodiments Figure 13 Back side schematic structure diagram of the protective film.

[0032] The accompanying drawings are marked as follows:

[0033] 10. backlight module, 11. back plate, 12. light guide plate, 13. reflector, 14. optical film group, 15. rubber frame, 16. double-sided foam tape, 17. light-shielding tape, 18. light bar, 19. positioning block, 20. display panel, 30. front frame, 31. second frame, 32. annular flange, 40. protective film, 50. screws, 61. annular foam;

[0034] 111, plate body, 112, retaining edge, 121, light emitting surface, 122, step structure, 123, fixing column, 141, first diffusion sheet, 142, first prism sheet, 143, second prism sheet, 144, second diffusion sheet, 151, first frame body, 152, convex rib, 181, first circuit board, 182, light source, 201, second circuit board, 202, array substrate, 203, color film substrate, 301, second card slot, 302, notch slot, 303, threaded hole, 401, identification area, 402, annular tape;

[0035] 1121, a first snap buckle, 1122, a second snap buckle, 1421, a notch groove of a first prism sheet, 1511, a support platform, 1521, a first slot, 1522, an avoidance groove, 1523, a limit block, 2011, a first pin area, 2012, an electronic component area, 2013, a connector, 2014, a reinforcement area, 2015, a second pin area, 2021, a binding portion. DETAILED DESCRIPTION

[0036] Those skilled in the art should understand that the technical solutions of the embodiments of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and all should be included in the scope of the claims of the present disclosure.

[0037] like Figure 1 As shown, Figure 1 The partially exploded structural schematic diagram of a display device of some exemplary embodiments includes a display panel 20, a backlight module 10 disposed on a side of the display panel 20 away from the display side, a front frame 30, and a protective film 40. The front frame 30 is fixedly connected to the backlight module 10 by a plurality of (four in this example) screws 50, and the peripheral edge of the display panel 20 is fixed between the front frame 30 and the backlight module 10.

[0038] like Figure 2 As shown, Figure 2 In some exemplary embodiments Figure 1Explosion structure schematic diagram of the backlight module of a display device. The backlight module 10 may include a backplane 11, a light bar, a reflector 13, a light guide plate 12, an optical film group 14, a rubber frame 15, and auxiliary materials such as a light-shielding tape 17 and a double-sided foam tape 16. Among them, the optical film group 14 may include a first diffusion sheet 141, a first prism sheet 142, a second prism sheet 143, and a second diffusion sheet 144 stacked in sequence on the light-emitting surface side of the light guide plate 12. The light bar may be disposed on the backplane 11 and located at the side of the light guide plate 12.

[0039] As Figures 3a to 3d shown, Figures 3a to 3d in some exemplary embodiments Figure 1 is a schematic cross-sectional structure diagram at four sides of a display device. The display device includes a display panel 20, a backlight module disposed on one side of the display panel 20 facing away from the display side, and a front frame 30. The circumferential edge of the display panel 20 is fixed between the front frame 30 and the rubber frame 15 of the backlight module.

[0040] In some exemplary embodiments, as Figures 3a to 3d , Figures 4 to 7 shown, Figure 4 in some exemplary embodiments Figure 2 is a schematic structure diagram of the light-emitting surface of the light guide plate of the backlight module, Figure 5a in some exemplary embodiments Figure 4 is a schematic structure diagram of the cooperation between the light guide plate and four optical films of the optical film group, Figure 5b in some exemplary embodiments Figure 5a is a schematic structure diagram of the light guide plate and the first prism sheet and the second prism sheet of the optical film group, Figure 6 in some exemplary embodiments Figure 4 is a schematic structure diagram of the cooperation between the light guide plate and the first prism sheet, Figure 7 is a schematic structure diagram of the backplane and the light bar of the backlight module in some exemplary embodiments. The backlight module includes a backplane 11, a light bar 18 ( Figure 3c shown), a light guide plate 12, and an optical film group 14; the backplane 11 includes a plate body 111 and a flange 112 disposed on the circumferential edge of the plate body 111. The light guide plate 12 is disposed on one side of the plate body 111. The light guide plate 12 has a light-emitting surface facing away from the plate body 111 and an incident surface adjacent to the light-emitting surface. The light bar 18 is disposed on the flange 112 and includes a plurality of light sources 182 facing the incident surface of the light guide plate 12; as Figures 4 to 6As shown, a stepped structure 122 is provided on a portion of the light-emitting surface 121 of the light guide plate 12 close to the light-incident surface, and the height of the steps in the stepped structure 122 gradually decreases in a first direction (the X direction in the figure, and in some examples, the first direction may be the length direction of the light-incident surface of the light guide plate 12); the optical film group 14 includes a plurality of optical films stacked on the side where the light-emitting surface of the light guide plate 12 is located, and each optical film is fixed to a corresponding step in the stepped structure 122; the plurality of optical films include a first prism sheet 142, and the surface of the first prism sheet 142 facing away from the light guide plate 12 has a plurality of first prisms arranged side by side ( Figure 5b the V-shaped protrusions shown in), the first prisms extend in a direction perpendicular to the first direction ( Figure 5b the Y direction in), a notch groove 1421 for avoiding the stepped structure 122 is provided at the edge of the first prism sheet 142, and a gap d ( Figure 6 shown) is provided between the groove wall of the notch groove 1421 of the first prism sheet 142 parallel to the first direction and the stepped structure 122, and the gap d is 0.5 mm to 0.8 mm.

[0041] In the backlight module according to an embodiment of the present disclosure, as Figures 4 to 6 shown, the plurality of optical films of the optical film group 14 cooperate with the stepped structure 122 provided on the light guide plate 12 for limiting. The stepped structure 122 of the light guide plate 12 is provided on a portion of the light-emitting surface 121 of the light guide plate 12 close to the light-incident surface, and the height of the steps in the stepped structure 122 gradually decreases in a first direction (the X direction in the figure). The plurality of optical films include a first prism sheet 142, the surface of the first prism sheet 142 facing away from the light guide plate 12 has a plurality of first prisms arranged side by side, the first prisms extend in a direction perpendicular to the first direction (the Y direction in the figure), a notch groove 1421 for avoiding the stepped structure 122 is provided at the edge of the first prism sheet 142, and a gap d of 0.5 mm to 0.8 mm is provided between the groove wall of the notch groove 1421 of the first prism sheet 142 parallel to the first direction and the stepped structure 122 ( Figure 6 shown). Due to the existence of the stepped structure 122 on the light guide plate 12, part of the light emitted by the light source 182 of the lamp strip 18 will directly enter the stepped structure 122, and the light emitted from the stepped structure 122 ( Figure 5bAs shown by the five dashed arrows (not shown), the light enters the first prism sheet 142 from the groove wall of the notch groove 1421 of the first prism sheet 142. The first prism sheet 142 condenses the incident light, which causes bright lines extending in the direction perpendicular to the first direction (the Y direction in the figure) at the position corresponding to the step structure 122 of the backlight module, resulting in uneven light output of the backlight module. By providing a gap d of 0.5 mm to 0.8 mm between the groove wall of the notch groove 1421 of the first prism sheet 142 parallel to the first direction and the step structure 122, the existence of this gap d weakens the intensity of the light incident on the first prism sheet 142 from the step structure 122. Thus, the phenomenon of bright lines generated at the position corresponding to the step structure 122 in the light output of the backlight module can be reduced, and the uniformity of the light output of the backlight module can be improved.

[0042] In some exemplary embodiments, such as Figure 2 , Figures 3a to 3d and Figure 5b shown, the optical film stack 14 includes a first diffusion sheet 141, the first prism sheet 142, a second prism sheet 143, and a second diffusion sheet 144 that are sequentially stacked on the light-emitting surface 121 of the light guide plate 12; the surface of the second prism sheet 143 facing away from the light guide plate 12 has a plurality of second prisms ( Figure 5b the V-shaped protrusions shown in Figure 5b ), and the second prisms extend in a direction parallel to the first direction ( Figure 5b the X direction in Figure 5b ). Among them, the first diffusion sheet 141 and the second diffusion sheet 144 can evenly diffuse the light. The first prism sheet 142 can brighten the outgoing light in the direction perpendicular to the first direction ( Figure 5b the Y direction in Figure 5b ), and the second prism sheet 143 can brighten the outgoing light in the direction parallel to the first direction ( Figure 5b the X direction in

[0043] In some exemplary embodiments, such as Figure 5aAs shown, the surface of the step structure 122 facing away from the plate body 111 can be bonded to the plurality of optical films by a light-shielding tape 17, and notch grooves for avoiding the step structure 122 are provided at the edges of the plurality of optical films. Exemplarily, as Figure 5a shown, the optical film group 14 includes a first diffusion sheet 141, the first prism sheet 142, the second prism sheet 143, and the second diffusion sheet 144 that are sequentially stacked on the light-emitting surface 121 of the light guide plate 12. The step structure 122 includes a first step, a second step, a third step, and a fourth step with gradually decreasing height along the first direction X. Among them, the first step, the second step, and the third step protrude from the light-emitting surface 121 of the light guide plate 12, and the fourth step is a groove provided on the light-emitting surface 121 of the light guide plate 12. The surfaces of the first step, the second step, the third step, and the fourth step facing away from the plate body 111 are respectively bonded and fixed to the second diffusion sheet 144, the second prism sheet 143, the first prism sheet 142, and the first diffusion sheet 141 by the light-shielding tape 17. The light-shielding tape 17 can be a black tape, and the thickness can be 0.05 mm. The material of the light guide plate 12 can be PC (polycarbonate).

[0044] In some exemplary embodiments, as Figures 4 to 6 shown, at least one ( Figure 4 two are shown in the figure) fixing posts 123 can be further provided on the light-emitting surface 121 of the light guide plate 12, and each optical film is provided with a positioning hole that is inserted and matched with the fixing post 123 to limit each optical film.

[0045] In some exemplary embodiments, as Figure 3c 、 Figure 7 shown, the lamp strip 18 can include a first circuit board 181 fixed on the edge 112 and a plurality of (such as 18 in this example) light sources 182 spaced on the first circuit board 181. The plurality of light sources 182 can be arranged in a row. The light emitted by the plurality of light sources 182 can enter the light guide plate 12 from the light-incident surface of the light guide plate 12 in a side-injection manner and exit from the light-emitting surface of the light guide plate 12.

[0046] In some exemplary embodiments, as Figure 7 shown, the shape of the plate body 111 is rectangular, and a positioning block 19 can be provided at each position near the four corners of the surface of the plate body 111 facing the light guide plate 12. The shape of the positioning block 19 can be a cuboid or an L shape. The four positioning blocks 19 can be set to position the positions of the light guide plate 12 near the four corners. The material of the positioning block 19 can be an elastic material such as white silica gel, the hardness can be 40 degrees, and the compression ratio can be greater than or equal to 60%. For example, Figure 7Two positioning blocks 19 are shown at positions near both ends of a short side of the plate body 111. The positioning block 19 close to the light bar 18 is cuboid-shaped, and the thickness of the cuboid-shaped positioning block 19 in the length direction parallel to the plate body 111 can be 1.5 mm. The positioning block 19 far from the light bar 18 can be L-shaped, and the thickness of the L-shaped positioning block 19 in the length direction parallel to the plate body 111 can be 1.5 mm, and the thickness in the direction perpendicular to the length direction of the plate body 111 can be 0.6 mm.

[0047] In some exemplary embodiments, as Figures 3a to 3d shown, the baffle 112 surrounds the circumferential side portions of the light guide plate 12 and the plurality of optical films. There are gaps between the circumferential edges of the light guide plate 12 and the plurality of optical films and the baffle 112. In this way, in the case of deformation of the back plate 11 or the like, it is possible to avoid problems such as deformation and wrinkles caused by the contact between the light guide plate 12 and the optical film and the back plate 11, and to avoid affecting the display image quality.

[0048] In some exemplary embodiments, as Figures 3a to 3d shown, the backlight module may further include a reflective sheet 13 provided on the side of the light guide plate 12 facing away from the light-emitting surface. The circumferential edge of the reflective sheet 13 may be provided with a flanging, and the flanging is attached to the circumferential side surface of the light guide plate 12 and avoids the light-incident surface. In this way, the reflective sheet 13 can reflect the light emitted from the light guide plate 12 and then enter the light guide plate 12, improving the light utilization rate. In an example of this embodiment, the baffle 112 of the back plate 11 may surround the circumferential side portions of the light guide plate 12, the reflective sheet 13, and the optical film group 14. There may be gaps between the circumferential edges of the light guide plate 12, the reflective sheet 13, and the plurality of optical films of the optical film group 14 and the baffle 112. In this way, it is possible to avoid wrinkles caused by contact with the back plate 11 in the case of deformation of the back plate 11 or the like, thereby avoiding affecting the image quality of the display panel. The thickness of the reflective sheet 13 can be 0.188 mm.

[0049] In some exemplary embodiments, as Figures 3a to 3d 、 Figure 8 shown, Figure 8Schematic diagram of the structure of the glue frame of the backlight module in some exemplary embodiments. The backlight module may further include a glue frame 15, and the glue frame 15 may include a first frame body 151 and ribs 152 provided on the circumferential edge of the first frame body 151. The first frame body 151 may be disposed on the side of the optical film group 14 facing away from the light guide plate 12, and the ribs 152 may surround the circumferential side of the baffle 112. There may be a gap between the surface of the first frame body 151 facing the light-emitting surface 121 of the light guide plate 12 and a part of an optical film (which may be the second diffusion sheet in some examples) in the optical film group 14 that is far from the light guide plate 12 and close to the circumferential edge. In this way, when the optical film expands, it can avoid contacting the first frame body 151 and generating wrinkles. In addition, the ribs 152 surround the circumferential side of the baffle 112, which is beneficial to fixing the glue frame 15 on the back plate 11 through the ribs 152 and the baffle 112.

[0050] In an example of this embodiment, as Figure 7 and Figure 8 shown, the baffle 112 may be provided with a plurality of first buckles 1121 along the circumference, and the ribs 152 are provided with a plurality of first slots 1521, and the plurality of first slots 1521 are correspondingly engaged with the plurality of first buckles 1121. Exemplarily, the number of the first buckles 1121 may be 11. The baffle 112 may include two opposite long sides and two opposite short sides. One long side of the baffle 112 is provided with 3 first buckles 1121, the other long side is provided with 4 first buckles 1121, and both short sides of the baffle 112 are provided with 2 first buckles 1121. As Figures 3a to 3d shown, the first frame body 151 may be provided with a limiting groove, and one end of the baffle 112 away from the plate body 111 may be clamped in the limiting groove.

[0051] The present disclosure embodiment also provides a display device, including a display panel and the backlight module according to any embodiment, and the backlight module is disposed on the side of the display panel facing away from the display side.

[0052] In some exemplary embodiments, as Figures 3a to 3dAs shown, the rubber frame 15 of the backlight module includes a first frame body 151 and a convex rib 152 arranged on the circumferential edge of the first frame body 151. The first frame body 151 can be arranged around the circumferential side of the display panel 20, and support the portion of the surface of the display panel 20 that is away from the display side and close to the circumferential edge. The first frame body 151 can be provided with a support platform 1511, and a foam double-sided adhesive 16 can be bonded to the support platform 1511. The portion of the surface of the display panel 20 that is away from the display side and close to the circumferential edge can be bonded to the support platform 1511 by the foam double-sided adhesive 16, so that the movement of the display panel 20 can be limited. In addition, since the foam double-sided adhesive 16 has a certain elastic deformation ability, the height of the display panel 20 at different positions after installation can be balanced, and the flatness of the display panel 20 can be improved, which is conducive to avoiding the light leakage problem of the dark state (L0 screen) of the display panel 20. The compression ratio of the foam of the foam double-sided adhesive 16 can be greater than or equal to 60%. The plastic frame 15 can be made of black PC material, which can prevent the display panel 20 from having bright lines or dark shadows around the display screen.

[0053] In some exemplary embodiments, Figures 3a to 3d As shown, the display device may further include a front frame 30 fixedly connected to the backlight module, the front frame 30 may include a second frame body 31 surrounding the circumferential side of the plastic frame 15, and an annular flange 32 connected to the second frame body 31 and located on the side of the first frame body 151 away from the plate body 111, the annular flange 32 may abut against the surface of the first frame body 151 away from the plate body 111 and against the portion of the display surface of the display panel close to the circumferential edge, so that the front frame 30 can fix the display panel 20.

[0054] In an example of this embodiment, Figures 3a to 3d , Figure 11 As shown, Figure 11 FIG. 1 is a schematic diagram of the structure of the front frame of the display device in some exemplary embodiments. The front frame 30 can be connected to the backlight module by screws, and can be connected by a snap-fit ​​structure. For example, the second frame body 31 of the front frame 30 can be provided with a plurality of threaded holes 303 ( Figure 11As shown, a plurality of threaded holes are provided on the rib 152 of the rubber frame 15 and on the edge stop 112 of the back plate 11. The front frame 30 is fixedly connected to the backlight module by screws passing through the threaded holes 303 of the second frame body 31 and the threaded holes of the rib 152 and the edge stop 112. The specification of the threaded holes on the edge stop 112 of the back plate 11 can be M1.4*P0.3, and the length is 1.1 mm, that is, the inner thread diameter of the threaded hole is 1.4 mm, the thread pitch is 0.3 mm, and the thread length is 1.1 mm. The materials of the front frame 30 and the back plate 11 can both be metals. For example, the material of the front frame 30 can be stainless steel, and the material of the back plate 11 can be aluminum. As Figure 11 shown, the shape of the second frame body 31 can be rectangular. The second frame body 31 includes opposite first and second side frames, and opposite third and fourth side frames. The first and second side frames can be arranged along the length direction of the second frame body 31, and the third and fourth side frames can be arranged along the width direction of the second frame body 31. The threaded holes 303 can be provided in 4 numbers. Two threaded holes 303 can be provided on the second side frame, and one threaded hole 303 can be provided on each of the third and fourth side frames.

[0055] In an example of this embodiment, a plurality of second card slots can be provided on the second frame body along the circumferential direction, and a plurality of second buckles are provided on the edge stop. The plurality of second buckles pass through the avoidance slots provided on the rib and are correspondingly clamped with the plurality of second card slots; or / and, a plurality of notch slots can be provided on the second frame body, and a plurality of limiting blocks are provided on the rib. The plurality of limiting blocks are correspondingly clamped with the plurality of notch slots. Exemplarily, as Figure 11 shown, the shape of the second frame body 31 can be rectangular. The second frame body 31 includes opposite first and second side frames, and opposite third and fourth side frames. The first and second side frames can be arranged along the length direction of the second frame body 31, and the third and fourth side frames can be arranged along the width direction of the second frame body 31. A plurality of second card slots 301 and a plurality of notch slots 302 can also be provided on the second frame body 31. The plurality of second card slots 301 can be arranged along the circumferential direction of the second frame body 31. For example, the number of the second card slots 301 can be 9. Two second card slots 301 can be provided on the first side frame, three second card slots 301 can be provided on the second side frame, and two second card slots 301 can be provided on each of the third and fourth side frames; the plurality of notch slots 302 can be provided on the third and fourth side frames of the second frame body 31. For example, the number of the notch slots 302 can be 8, and can be provided at both ends and the middle positions of the third and fourth side frames. As Figure 7 and Figure 8As shown, a plurality of second buckles 1122 may also be provided on the edge guard 112 of the backplane 11. The plurality of second buckles 1122 may pass through the avoidance grooves 1522 provided on the rib 152 of the glue frame 15 and be correspondingly clamped with the plurality of second card slots 301. As Figure 8 shown, a plurality of limiting blocks 1523 are provided on the two short sides of the rib 152 of the glue frame 15. The plurality of limiting blocks 1523 may be correspondingly clamped with the plurality of notch grooves 302. The shapes of the plurality of limiting blocks 1523 may be the same or different. Figure 8 In the example of, the shapes of the plurality of limiting blocks 1523 include triangular prism shape, cube shape, L shape, etc. The shape of the limiting block 1523 is adapted to the shape of the corresponding notch groove 302. In this example, through the clamping of the second card slot 301 and the second buckle 1122, and the clamping of the notch groove 302 and the limiting block 1523, the front frame 30 can be more firmly fixed on the backlight module.

[0056] In some exemplary embodiments, such as Figures 3a to 3d 、 Figure 12 shown, Figure 12 For the top view structural schematic diagram of the front frame in some exemplary embodiments Figure 11 Part of the surface of the annular flange 32 of the front frame 30 facing away from the display panel 20 and close to the circumferential edge of the display panel 20, and the end face of the annular flange 32 may be provided with a light-shielding layer to avoid light leakage and affect the picture quality of the display panel 20. The light-shielding layer may be a black ink layer formed by spraying. To improve the adhesion of the black ink layer, the black ink layer may be set as: ink adhesion ≥ 3B, surface hardness > 2H, 100% adhesion in the alcohol resistance test for 50 times, and no bottom color seen in the abrasion resistance test for 240 times. An annular foam 61 may be provided on the surface of the annular flange 32 of the front frame 30 facing away from the display panel 20 and close to the circumferential edge of the display panel 20. The annular foam 61 may be located above the light-shielding layer. The shape of the annular foam 61 may be adapted to the shape of the annular flange 32, and may both be rectangular. The annular foam 61 may be an integrally formed structure to prevent light leakage. The display device may further include a protective film attached to the display surface of the display device. The protective film may protect the display panel 20 and can be torn off. As Figure 13 and Figure 14 shown, Figure 13 For the front view structural schematic diagram of the protective film of the display device in some exemplary embodiments, Figure 14 For in some exemplary embodiments Figure 13Schematic diagram of the back structure of the protective film. The protective film 40 may include a substrate of transparent material. On the front side of the protective film 40, there may be a marking area 401, and the marking area 401 may be coated with a color (such as red). The protective film 40 may further include an annular adhesive tape 402 provided on the back side of the substrate, and the protective film 40 may be adhered to the annular foam 61 of the front frame 30 through the annular adhesive tape 402.

[0057] In some exemplary embodiments, the display panel may include an array substrate. The array substrate is provided with a bonding portion bonded to an external circuit board. The bonding portion is disposed close to the first side of the array substrate. A part of the array substrate close to the second side may be provided with a gate driving circuit. The first side and the second side of the array substrate are adjacent to each other. The light bar is disposed close to the first side of the array substrate.

[0058] In an example of this embodiment, as Figure 3c , Figure 9 shown, Figure 9 Schematic diagram of the structure of the display panel of the display device in some exemplary embodiments. The display panel 20 may be a liquid crystal display panel. The display panel 20 may include an array substrate 202 and a color filter substrate 203 disposed opposite to each other, a liquid crystal layer located between the array substrate 202 and the color filter substrate 203, a first polarizer disposed on the side of the array substrate 202 facing away from the color filter substrate 203, and a second polarizer disposed on the side of the color filter substrate 203 facing away from the array substrate 202. The array substrate 202 may include a bonding portion 2021 protruding from one side of the color filter substrate 203. The display panel 20 may further include a second circuit board 201 bonded to the bonding portion 2021. The second circuit board 201 is arranged to be connected to an external driving device to drive the display panel 20 to display. The second circuit board 201 may be a flexible circuit board and may be bent to the side of the display panel 20 facing away from the display side. A driving chip (driving IC) may be bonded and connected to the bonding portion 2021 or the second circuit board 201. The bonding portion 2021 is disposed close to the first side of the array substrate 202. A part of the array substrate 202 close to the second side may be provided with a gate driving circuit (GOA). The first side and the second side of the array substrate 202 are adjacent to each other. The light bar 18 is disposed close to the first side of the array substrate 202. The array substrate includes a circuit structure layer (including GOA) disposed on a substrate. The circuit structure layer includes a plurality of gate lines and a plurality of data lines arranged crosswise. The GOA may include a plurality of sequentially connected shift registers. Each shift register drives one gate line and provides an enabling signal for the next shift register. The GOA can achieve the purpose of sequentially turning on the gate lines. Figure 9In the example, the first side of the array substrate 202 is parallel to the length direction of the array substrate 202, and the second side of the array substrate 202 is parallel to the width direction of the array substrate 202. The light bar 18 is not disposed close to the second side of the array substrate 202, which can prevent problems such as abnormal image display caused by peeling of the film layer forming the gate driving circuit on the array substrate 202 due to heat generation of the light bar 18. The liquid crystal material of the liquid crystal layer may adopt a wide-temperature liquid crystal, so as to improve the display quality of the liquid crystal display panel 20 in a relatively wide temperature range.

[0059] In some exemplary embodiments, as Figure 10 shown, Figure 10 For some exemplary embodiments Figure 9 is a schematic structural diagram of a second circuit board of a display panel. The second circuit board may include a first pin area 2011, an electronic component area 2012, and a second pin area 2015. The first pin area 2011 may be provided with a plurality of first pins, and the plurality of first pins may be bonded and connected to the bonding portion 2021 of the display panel 20. The second pin area 2015 may be provided with a plurality of second pins, and the plurality of second pins may be set to be bonded and connected to an external driving device to provide a power signal and a driving signal to the display panel through the second circuit board. A connector 2013 may also be provided on the second circuit board. The connector 2013 may be set to be electrically connected to the first circuit board of the light bar to provide power for the first circuit board. The second circuit board 201 may further include a reinforcing area 2014 near the second pin area 2015. A part of the reinforcing area 2014 may be provided with an adhesive, which is beneficial to bonding the connector to the second circuit board 201 after inserting the second pins of the second pin area 2015 into the connector of the external driving device.

[0060] The display device according to the embodiments of the present disclosure can be used in household products such as cooking utensils, laundry equipment, dishwashers, refrigerators, refrigerating machines, microwave ovens, coffee machines, or ovens. Alternatively, the display device according to the embodiments of the present disclosure may be: any product or component having a display function such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, or a navigator.

[0061] In the drawings, sometimes for clarity, the sizes of the components, the thicknesses of the layers, or the areas are exaggerated. Therefore, the embodiments of the present disclosure are not necessarily limited to this size, and the shapes and sizes of each component in the drawings do not reflect the true proportions. In addition, the drawings schematically show some examples, and the embodiments of the present disclosure are not limited to the shapes or values shown in the drawings.

[0062] In the description herein, "parallel" means a state where the angle formed by two straight lines is more than -10° and less than 10°, and thus includes a state where the angle is more than -5° and less than 5°. Additionally, "perpendicular" means a state where the angle formed by two straight lines is more than 80° and less than 100°, and thus includes a state where the angle is more than 85° and less than 95°.

[0063] In the description herein, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "top", "inner", "outer", "axial", "four corners", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the simplified description of the embodiments of the present disclosure, rather than indicating or implying that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present disclosure.

[0064] In the description herein, unless otherwise clearly specified and limited, the terms "connect", "fixed connection", "install", "assemble" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; the terms "install", "connect", "fixed connection" may be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two components. For those of ordinary skill in the art, the meanings of the above terms in the embodiments of the present disclosure can be understood according to the circumstances.

Claims

1. A backlight module, characterized in that: It includes a backplane, a light bar, a light guide plate, and an optical film group; The backplane includes a plate body and a retaining edge provided at the circumferential edge of the plate body. The light guide plate is disposed on one side of the plate body. The light guide plate has a light-emitting surface facing away from the plate body and a light-incident surface adjacent to the light-emitting surface. The light bar is disposed on the retaining edge. The light bar includes a first circuit board fixed on the retaining edge and a plurality of light sources spaced on the first circuit board. The plurality of light sources face the light-incident surface of the light guide plate; A stepped structure is provided on a portion of the light-emitting surface of the light guide plate close to the light-incident surface. The height of the steps in the stepped structure gradually decreases in a first direction; The optical film group includes a plurality of optical films stacked on the side where the light-emitting surface of the light guide plate is located. Each optical film is fixed to a corresponding step in the stepped structure; The plurality of optical films include a first prism sheet. The surface of the first prism sheet facing away from the light guide plate has a plurality of first prisms arranged side by side. The first prisms extend in a direction perpendicular to the first direction. A notch groove for avoiding the steps in the stepped structure that are not fixed to itself is provided at the edge of the first prism sheet. A gap is provided between the groove wall of the notch groove of the first prism sheet parallel to the first direction and the stepped structure. The gap is 0.5 mm to 0.8 mm.

2. The backlight module according to claim 1, wherein: The optical film group includes a first diffusion sheet, the first prism sheet, a second prism sheet, and a second diffusion sheet stacked in sequence on the light-emitting surface of the light guide plate. The stepped structure includes a first step, a second step, a third step, and a fourth step with heights gradually decreasing in the first direction. The surfaces of the first step, the second step, the third step, and the fourth step facing away from the plate body are adhesively bonded to the second diffusion sheet, the second prism sheet, the second prism sheet, and the first diffusion sheet respectively through light-shielding tapes.

3. The backlight module according to claim 2, wherein: The surface of the second prism sheet facing away from the light guide plate has a plurality of second prisms arranged side by side. The second prisms extend in a direction parallel to the first direction.

4. The backlight module according to claim 1, wherein: The retaining edge surrounds the circumferential side portions of the light guide plate and the plurality of optical films. There are gaps between the circumferential edges of the light guide plate and the plurality of optical films and the retaining edge.

5. The backlight module according to claim 1, characterized in that: The backlight module further includes a rubber frame. The rubber frame includes a first frame body and convex ribs provided at the circumferential edge of the first frame body. The first frame body is disposed on the side of the optical film group facing away from the light guide plate. The convex ribs surround the circumferential side portion of the retaining edge.

6. The backlight module according to claim 5, wherein: A plurality of first buckles are provided on the retaining edge in the circumferential direction. A plurality of first card slots are provided on the convex ribs. The plurality of first card slots are correspondingly clamped with the plurality of first buckles.

7. The backlight module according to claim 1, wherein: The backlight module further includes a reflection sheet disposed on the side of the light guide plate facing away from the light-emitting surface. The circumferential edge of the reflection sheet is provided with a flanging, and the flanging is attached to the circumferential side surface of the light guide plate and avoids the light-incident surface.

8. A display device, characterized in that: It includes a display panel and the backlight module according to claim 1. The backlight module is disposed on the side of the display panel facing away from the display side.

9. The display device according to claim 8, wherein: The display panel includes an array substrate. The array substrate is provided with a bonding portion that is bonded and connected to an external circuit board. The bonding portion is disposed near the first side edge of the array substrate. A gate driving circuit is provided in a portion of the array substrate near the second side edge. The first side edge and the second side edge of the array substrate are adjacent. The light bar is disposed near the first side edge of the array substrate.

10. The display device according to claim 8, wherein: The backlight module further includes a rubber frame. The rubber frame includes a first frame body and convex ribs provided on the circumferential edge of the first frame body. The first frame body is disposed on a side of the optical film group facing away from the light guide plate. The convex ribs surround the circumferential side portion of the baffle edge. The first frame body also surrounds the circumferential side portion of the display panel. The first frame body is provided with a support platform. A portion of the surface of the display panel facing away from the display side near the circumferential edge is adhesively bonded to the support platform through double-sided foam tape.

11. The display device according to claim 10, wherein: The display device further includes a front frame fixedly connected to the backlight module. The front frame includes a second frame body surrounding the circumferential side portion of the rubber frame, and an annular flange connected to the second frame body and located on a side of the first frame body facing away from the plate body. The annular flange abuts on the surface of the first frame body facing away from the plate body and abuts on a portion of the display surface of the display panel near the circumferential edge.

12. The display device according to claim 11, wherein: A plurality of second card slots are provided on the second frame body along the circumference. A plurality of second buckles are provided on the baffle edge. The plurality of second buckles pass through the avoidance slots provided on the convex ribs and are correspondingly clamped with the plurality of second card slots. Or / and, a plurality of notch slots are provided on the second frame body. A plurality of limiting blocks are provided on the convex ribs. The plurality of limiting blocks are correspondingly clamped with the plurality of notch slots.

Images