Display device, backlight module, and assembly method of backlight module

Abstract

A display device, a backlight module and an assembling method of the backlight module are disclosed. The backlight module comprises a back plate, a light source, a diffusion plate, an optical film and at least one frame. The back plate comprises a bottom plate, a side wall and a bending portion, wherein the side wall connects the bottom plate and the bending portion. The bending portion has a first surface and a second surface, wherein the first surface faces the bottom plate and the second surface is opposite to the first surface. The light source is disposed on the bottom plate of the back plate. The diffusion plate is stacked on the second surface of the bending portion, and the optical film is stacked on the diffusion plate. The frame covers the side wall of the back plate and covers the edge portion of the optical film away from the bending portion. The configuration can achieve the structural simplification and thinning of the backlight module, and help to improve the assembling efficiency of the backlight module.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a display device, a backlight module of the display device, and an assembling method of the backlight module. BACKGROUND

[0002] A display backlight module includes optical films to uniformly distribute light from a light source to a display panel. Currently, the trend of display backlight modules is to use mini light-emitting diodes (Mini LEDs) as light sources, which not only improves the brightness of the backlight module, but also allows the overall thinning of the direct backlight display due to the reduction in the height of the light cavity. However, the internal structure of the current Mini LED direct backlight module is not simplified, and most of them use additional support or aluminum extrusion front frame to fix the optical films. In addition to the need to horizontally insert the diffusion plate into the gap during assembly, it also increases the difficulty of assembling the optical films, which is easy to cause damage to the optical films. SUMMARY

[0003] Therefore, the present disclosure proposes a backlight module with a simple structure and easy assembly.

[0004] To achieve the above-mentioned purpose, according to some embodiments of the present disclosure, a backlight module includes a back plate, a light source, a diffusion plate, optical films, and at least one frame. The back plate includes a bottom plate, a side wall, and a bent portion, wherein the side wall connects the bottom plate and the bent portion. The bent portion has a first surface facing the bottom plate and a second surface opposite to the first surface. The light source is disposed on the bottom plate of the back plate. The diffusion plate is stacked on the second surface of the bent portion, and the optical films are stacked on the diffusion plate. The frame covers the side wall of the back plate and covers the edge portion of the side of the optical films away from the bent portion.

[0005] In one or more embodiments of the present disclosure, the side wall extends along the periphery of the bottom plate and cooperates with the bottom plate to define a cavity. The side wall has an outer surface facing away from the cavity, and the bent portion extends away from the outer surface of the side wall.

[0006] In one or more embodiments of the present disclosure, the bent portion extends along at least two edges of the back plate.

[0007] In one or more embodiments of the present disclosure, the backlight module includes a first frame and a second frame. The first frame is fixed on the back plate, and the second frame covers the first frame.

[0008] In one or more embodiments of the present disclosure, the second frame includes a fixing portion, which is located on the side of the bottom plate away from the diffusion plate and fixedly connected to the bottom plate.

[0009] In one or more embodiments of the present disclosure, the bottom plate has a recess at the edge of the bottom plate, and the fixing portion of the frame is fixed in the recess of the bottom plate.

[0010] In one or more embodiments of the present disclosure, the light source, the diffusion plate, and the optical film are arranged in a first direction. The sidewall of the back plate further comprises at least one protrusion extending along the first direction and abutting against the frame.

[0011] In one or more embodiments of the present disclosure, the optical film has a through hole, and the back plate further comprises a hanging ear structure protruding from the bending portion towards a direction away from the bottom plate and passing through the through hole of the optical film.

[0012] According to some embodiments of the present disclosure, a display device comprises the aforementioned backlight module and a display panel disposed on a side of the frame of the backlight module away from the optical film.

[0013] According to some embodiments of the present disclosure, a method for assembling a backlight module comprises: providing a back plate comprising a bottom plate, a sidewall, and a bending portion, the sidewall connecting the bottom plate and the bending portion, the bending portion having a first surface facing the bottom plate and a second surface opposite to the first surface; disposing a light source on the bottom plate of the back plate and facing a first direction; moving a diffusion plate in a direction opposite to the first direction onto the second surface of the bending portion; moving an optical film in a direction opposite to the first direction onto the diffusion plate; and covering a frame on the sidewall of the back plate and covering an edge portion of the optical film away from the bending portion.

[0014] In summary, in the backlight module of the present disclosure, the bending portion is formed on the back plate as a structure for bearing the diffusion plate and the optical film. In this way, the diffusion plate and the optical film can be assembled in a straight-up and straight-down manner without being bent or inserted laterally, the assembly efficiency can be improved, and the assembly process will not cause scratches on the diffusion plate and the optical film. In addition, the method of forming the bending portion on the back plate to support the diffusion plate and the optical film can also make the overall structure of the backlight module more compact, which helps to reduce the manufacturing cost and make the backlight module more thin. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the above and other purposes, features, advantages and embodiments of the present disclosure more obvious and easy to understand, the following is a description of the accompanying drawings:

[0016] Figure 1 To illustrate the assembled view of the display device according to an embodiment of the present disclosure;

[0017] Figure 2 To illustrate Figure 1 the exploded view of the display device shown;

[0018] Figure 3 To illustrate Figure 2 the enlarged view of the display device shown in region M;

[0019] Figure 4 FIG. 1 shows a cross-sectional view of a display device along line segment 1-1’; Figure 1

[0020] Figures 5 to 7 FIG. 2 shows a cross-sectional view of a backlight module of the display device shown in FIG. 1 at an assembly stage; Figure 4

[0021] Figure 8 FIG. 3 shows a cross-sectional view of a display device according to another embodiment of the disclosure;

[0022] Figure 9 FIG. 4 shows a cross-sectional view of the display device shown in FIG. 3 at different positions. Figure 8

[0023]

Symbol Explanation

[0024] 100: display device

[0025] 110: display panel

[0026] 111: first surface

[0027] 112: second surface

[0028] 120: backlight module

[0029] 130: back plate

[0030] 131: bottom plate

[0031] 132: side wall

[0032] 133: bending portion

[0033] 134: clasp structure

[0034] 135: protruding portion

[0035] 136: ear structure

[0036] 141: light source

[0037] 141A: circuit board

[0038] 141B: light-emitting diode

[0039] 142: reflecting plate

[0040] 143: opening

[0041] 151: diffusion plate

[0042] 152: optical film

[0043] 156: through hole

[0044] ​​​160: first frame

[0045] 161: first cover portion

[0046] 162: second cover portion

[0047] 164: card slot

[0048] 270: second frame

[0049] 271: fixing portion

[0050] 272: side wall portion

[0051] 273: platform portion

[0052] 274: bezel portion

[0053] 275: end

[0054] 276: plane

[0055] A1, A2: adhesive

[0056] B: recess

[0057] C: cavity

[0058] D1: first direction

[0059] D2: second direction

[0060] D3: third direction

[0061] D4: opposite direction

[0062] F: fastener

[0063] S1: first surface

[0064] S2: second surface

[0065] S3: outer surface DETAILED DESCRIPTION

[0066] To make the description of the present disclosure more detailed and complete, various embodiments described below can be referred to the accompanying drawings. Each element in the drawings is not drawn to scale, and is provided only to illustrate the present disclosure. Many practical details are described below to provide a comprehensive understanding of the present disclosure, however, those skilled in the art should understand that the present disclosure can be implemented without one or more practical details, therefore, these details should not be used to limit the present disclosure.

[0067] Please refer to Figure 1 , the display device 100 includes a display panel 110 (for example: liquid crystal display panel) and a backlight module 120. The display panel 110 has a first surface 111 and a second surface 112 opposite to each other (seeFigure 2 The first surface 111 faces outward to display the image; that is, the first surface 111 is the display surface of the display panel 110. The display panel 110 is disposed on the backlight module 120 with the first surface 111 facing away from the backlight module 120. The backlight module 120 is configured to provide illumination for the display panel 110, enabling the display panel 110 to display an image.

[0068] like Figure 1 As shown, for ease of description, the first direction D1 is defined as the direction in which the first surface 111 of the display panel 110 faces (e.g.: Figure 1 The normal direction of the first surface 111), and the second direction D2 is the direction in which the short side of the display device 100 extends (e.g.: Figure 1 The vertical direction D3 is the direction in which the long side of the display device 100 extends (e.g., the direction of the vertical upward direction). Figure 1 (Horizontal direction to the right). In some embodiments, the first direction D1, the second direction D2, and the third direction D3 are substantially perpendicular to each other, as shown in the display device 100. Figures 4 to 9 lay flat rather than like Figure 1 As shown, it will also turn when erected.

[0069] Please refer to Figures 2 to 4 The backlight module 120 includes a backplate 130 and a light source 141. The backplate 130 includes a base plate 131 and a sidewall 132. The sidewall 132 is connected to the base plate 131 and extends along the periphery of the base plate 131. The sidewall 132 and the base plate 131 together define a cavity C. The light source 141 is disposed on the base plate 131 of the backplate 130 and is located in the cavity C. The light source 141 illuminates the display panel 110 in a first direction D1.

[0070] like Figures 2 to 4 As shown, in some embodiments, the light source 141 includes an LED panel or LED strip. In some embodiments, the light source 141 includes a circuit board 141A and a plurality of light-emitting diodes 141B, wherein the light-emitting diodes 141B are Mini LEDs and are disposed on the circuit board 141A and arranged in a matrix. In some embodiments, the light source 141 can be fixed to the base plate 131 of the back plate 130 by adhesive A1.

[0071] like Figures 2 to 4As shown, in some embodiments, the backlight module 120 further includes a reflector 142 disposed on the base plate 131 of the back panel 130. The reflector 142 covers the inner surface of the back panel 130 and is configured to reflect light incident on the inner surface of the back panel 130 toward the display panel 110. In some embodiments, the reflector 142 has one or more openings 143, such that when the light source 141 and the reflector 142 are disposed on the base plate 131 of the back panel 130, the openings 143 correspond precisely to the positions of the light-emitting diodes 141B of the light source 141.

[0072] like Figures 2 to 4 As shown, the back plate 130 further includes an inwardly bent portion 133, and a sidewall 132 connects the bottom plate 131 and the bent portion 133. The bent portion 133 has a first surface S1 and a second surface S2, the first surface S1 facing the bottom plate 131, and the second surface S2 facing away from the first surface S1. In some embodiments, the sidewall 132 has an outer surface S3 facing away from the cavity C, and the bent portion 133 extends in a direction away from the outer surface S3 of the sidewall 132.

[0073] like Figures 2 to 4 As shown, in some embodiments, the bent portion 133 extends along at least two edges of the back plate 130. For example, the bent portion 133 may be provided on the left and right edges, the top and bottom edges, or all four edges of the back plate 130. In some embodiments, the back plate 130 is a one-piece metal structure, which can be formed by bending metal sheets.

[0074] like Figures 2 to 4 As shown, the backlight module 120 further includes a diffuser plate 151 and at least one optical film 152. The light source 141, diffuser plate 151, optical film 152, and display panel 110 are arranged in a first direction D1, with the diffuser plate 151 and optical film 152 located between the light source 141 and the display panel 110. The diffuser plate 151 is disposed on the second surface S2 of the bent portion 133, while the optical film 152 is stacked on the diffuser plate 151. In other words, the bent portion 133 is supported on the edge portions of the diffuser plate 151 and the edge portions of the optical film 152 (e.g., portions of the diffuser plate 151 or optical film 152 adjacent to their outer boundaries).

[0075] In the backlight module 120 of the present disclosure, the bending portion 133 is formed on the back plate 130 as a structure for carrying the diffusion plate 151 and the optical film 152. In this way, the diffusion plate 151 and the optical film 152 can be assembled in a straight-up and straight-down manner (for example, the diffusion plate 151 and the optical film 152 can be moved along the opposite direction of the first direction D1 and mounted on the back plate 130), so that the assembly efficiency can be improved, and the assembly process and the structure after assembly completion will not cause the diffusion plate 151 and the optical film 152 to be abraded or scratched. In addition, the method of forming the bending portion 133 to support the diffusion plate 151 and the optical film 152 can also make the overall structure of the backlight module 120 more compact, reduce the thickness of the backlight module 120, and also help to reduce the manufacturing cost.

[0076] As shown in FIG. 1, in some embodiments, the reflective plate 142 extends obliquely to the second surface S2 of the bending portion 133. Therefore, in addition to serving as a carrying structure for the diffusion plate 151 and the optical film 152, the bending portion 133 also supports and fixes the extended portion of the reflective plate 142. Figures 2 to 4

[0077] As shown in FIG. 1, in some embodiments, the backlight module 120 further includes a first frame 160 arranged on the diffusion plate 151 and the optical film 152. The first frame 160 is hollow in the middle to expose part of the optical film 152 and covers the edge portion of the diffusion plate 151 and the edge portion of the optical film 152, so that the edge portion of the diffusion plate 151 and the edge portion of the optical film 152 are located between the first frame 160 and the bending portion 133 of the back plate 130. In some embodiments, the first frame 160 is a plastic frame formed integrally. Figures 2 to 4

[0078] As shown in FIG. 1, in some embodiments, the display panel 110 is arranged on the first frame 160 and faces the diffusion plate 151 and the optical film 152. In some embodiments, the display panel 110 is fixed on the side of the first frame 160 away from the optical film 152 by means of the adhesive A2. Figures 2 to 4

[0079] As shown in FIG. 1, in some embodiments, the display panel 110 is arranged on the first frame 160 and faces the diffusion plate 151 and the optical film 152. In some embodiments, the display panel 110 is fixed on the side of the first frame 160 away from the optical film 152 by means of the adhesive A2. Figures 2 to 4 ​​​As shown, the first frame 160 is fixed to the back plate 130. In some embodiments, the first frame 160 includes a first cover 161 and a second cover 162. The first cover 161 is fixedly connected to the side wall 132 and covers the outer side of the side wall 132. The second cover 162 is connected to the first cover 161 and extends laterally to the side of the optical film 152 away from the bend 133, covering the edge portion of the optical film 152. The display panel 110 is disposed on the second cover 162 of the first frame 160. Specifically, the second cover 162 has two opposing surfaces, one of which faces the optical film 152, and the display panel 110 is disposed on the other surface. The first frame 160 has only the second covering portion 162 extending laterally, and no other laterally extending structures. In the backlight module 120, there are no laterally extending structures between the bending portion 133 and the second covering portion 162. Therefore, during assembly, the diffuser plate 151 and the optical film 152 can be placed and fixed on the bending portion 133 in sequence, and then the second covering portion 162 of the first frame 160 covers the edge portions of the diffuser plate 151 and the optical film 152.

[0080] like Figures 2 to 4 As shown, in some embodiments, the sidewall 132 of the back panel 130 includes at least one snap-fit ​​structure 134 located on the outside of the sidewall 132 (i.e. the side of the sidewall 132 away from the cavity C), and the first cover portion 161 of the first frame 160 has at least one slot 164 that engages with the snap-fit ​​structure 134.

[0081] like Figures 2 to 4 As shown, in some embodiments, the sidewall 132 of the back panel 130 further includes at least one protrusion 135 extending beyond the bend 133 in a first direction D1 and serving to support the first frame 160. Specifically, the protrusion 135 extends along the first direction D1 past the outer side of the diffuser plate 151 and the optical film 152, and abuts against the first frame 160. In some embodiments, the protrusion 135 abuts against the second cover 162 of the first frame 160. In some embodiments, the protrusion 135 abuts against the corner between the first cover 161 and the second cover 162.

[0082] In some embodiments, the sidewall 132 of the back panel 130 includes a plurality of protrusions 135 arranged along one or more edges of the back panel 130. For example, the protrusions 135 may be arranged along the second direction D2 on the left and right edges of the back panel 130, or along the third direction D3 on the top and bottom edges of the back panel 130.

[0083] The following is for reference Figures 5 to 7An assembling method of the backlight module 120 is introduced. The assembling method of the backlight module 120 can include steps B1-B5.

[0084] As shown in Figure 5 , first, in step B1, the back plate 130 is laid flat with the upward direction (i.e., the first direction D1 is upward), the light source 141 is disposed on the bottom plate 131 of the back plate 130, and the light source 141 is directed toward the first direction D1. In some embodiments, step B1 includes fixing the light source 141 on the bottom plate 131 through the adhesive A1. In some embodiments, step B1 further includes, after installing the light source 141, moving the reflecting plate 142 into the back plate 130 along the opposite direction D4 of the first direction D1, so that the reflecting plate 142 covers the inner surface of the back plate 130 and abuts against the bent portion 133.

[0085] As shown in Figure 6 , then, in step B3, the diffusion plate 151 is moved onto the second surface S2 of the bent portion 133 along the opposite direction D4 of the first direction D1, and the optical film 152 is moved onto the diffusion plate 151 along the opposite direction D4 of the first direction D1.

[0086] As shown in Figure 7 , finally, in step B5, the first frame 160 is moved along the opposite direction D4 of the first direction D1, so that the first frame 160 covers the side wall 132 of the back plate 130 and covers the edge portion of the optical film 152 away from the bent portion 133. In some embodiments, step B5 includes buckling the clamping slot 164 of the first frame 160 on the buckle structure 134 of the back plate 130, so that the first frame 160 is fixed to the back plate 130.

[0087] Referring back to Figure 4 , in some embodiments, after the assembling of the backlight module 120 is completed, the display panel 110 can be fixed on the first frame 160, and the assembling of the display device 100 is completed.

[0088] Referring to Figure 8 , compared with the embodiment shown in Figure 4 , the display device of the present embodiment further includes a second frame 270, and the second frame 270 covers the first frame 160 from the outside, so that the first frame 160 disposed on the back plate 130 is located between the second frame 270 and the back plate 130. In addition, unlike the embodiment shown in Figure 4 , in the present embodiment, the display panel 110 is disposed on the second frame 270. For example, the display panel 110 can be fixed on the side of the second frame 270 away from the optical film 152 through the adhesive A2.

[0089] As shown in Figure 8As shown, in some embodiments, the second frame 270 includes a fixing portion 271. The fixing portion 271 is located on the side of the base plate 131 away from the diffuser plate 151 and the optical film 152 (that is, the fixing portion 271 covers the edge portion of the back plate 130 on the outer side) and is fixedly connected to the base plate 131. In some embodiments, the fixing portion 271 is fixed to the base plate 131 of the back plate 130 by one or more fasteners F (e.g., screws). In some embodiments, the edge portion of the base plate 131 is bent inward by a certain distance to form a recess B, and the fixing portion 271 of the second frame 270 is fixed to the recess B of the base plate 131. In this way, the fixing portion 271 does not protrude significantly from the outer surface of the back plate 130 after being fixed to the back plate 130.

[0090] like Figure 8 As shown, in some embodiments, the second frame 270 further includes a sidewall portion 272 and a platform portion 273, wherein the sidewall portion 272 covers the first cover portion 161 of the first frame 160 and the sidewall 132 of the back plate 130, and the platform portion 273 connects to the sidewall portion 272 and covers the second cover portion 162 of the first frame 160 and the edge portion of the optical film 152 away from the bend portion 133. The platform portion 273 is used to support the display panel 110.

[0091] like Figure 8 As shown, in some embodiments, the second frame 270 further includes a border portion 274 that protrudes from the platform portion 273 and extends along the edge of the display panel 110. In the first direction D1, the border portion 274 extends beyond or is aligned with the first surface 111 (i.e., the display surface) of the display panel 110. In other words, in the first direction D1, the distance between the end point 275 of the border portion 274 and the plane 276 of the platform portion 273 that supports the display panel 110 is greater than or equal to the distance between the first surface 111 of the display panel 110 and the plane 276.

[0092] Please refer to Figure 9 It is a drawing Figure 8The cross-sectional views of the display device at different positions are shown. In some embodiments, the optical film 152 has at least one through hole 156, and the back plate 130 includes at least one ear structure 136 protruding from the bending portion 133 in a direction away from the bottom plate 131 (e.g., the first direction D1) and passing through the through hole 156 of the optical film 152, thereby fixing the optical film 152. In some embodiments, the back plate 130 forms one or more ear structures 136 on the top side. In some embodiments, the ear structure 136 is used to support the first frame 160, and the ear structure 136 abuts against the second cover portion 162 of the first frame 160. In some embodiments, the first frame 160 only has the second cover portion 162 extending laterally, and there is no other laterally extending structure between the bending portion 133 and the second cover portion 162 in the backlight module 120. Therefore, when assembling, the diffusion plate 151 and the optical film 152 can be sequentially placed and fixed on the bending portion 133, the through hole 156 of the optical film 152 is sleeved on the ear structure 136, and the second cover portion 162 of the first frame 160 covers the edge portion of the diffusion plate 151 and the optical film 152.

[0093] In summary, in the backlight module of the present disclosure, the bending portion is formed on the back plate as a structure for bearing the diffusion plate and the optical film. In this way, the diffusion plate and the optical film can be assembled in a straight-up and straight-down manner, without the need to bend or laterally insert the diffusion plate and the optical film, so that the assembly efficiency can be improved, and the assembly process will not cause scratches on the diffusion plate and the optical film. In addition, the method of forming the bending portion on the back plate to support the diffusion plate and the optical film can also make the overall structure of the backlight module more compact, which helps to reduce the manufacturing cost and make the backlight module more thin.

[0094] Although the present disclosure has been disclosed with embodiments as above, it is not intended to limit the present disclosure, and those skilled in the art can make various modifications and decorations without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the scope defined by the appended claims.

Claims

1. A backlight module, characterized by, The backlight module comprises: a backboard comprising a bottom plate, a sidewall, and a bent portion, the sidewall connecting the bottom plate and the bent portion, wherein the bent portion has a first surface facing the bottom plate and a second surface opposite to the first surface; a light source disposed on the bottom plate of the backboard; a diffusion plate disposed on the second surface of the bent portion; an optical film stacked on the diffusion plate; and at least one frame covering the sidewall of the backboard and covering the edge portion of the optical film away from the bent portion, wherein the at least one frame comprises a first frame comprising a first covering portion covering the outside of the sidewall and a second covering portion connected to the first covering portion and extending laterally from the first covering portion, so that a gap is reserved between the second covering portion and the bent portion, and the edge portion of the diffusion plate and the edge portion of the optical film are located in the gap and completely on the inside of the first covering portion.

2. The backlight module of claim 1, wherein, The sidewall extends along the periphery of the bottom plate and cooperates with the bottom plate to define a cavity, and the sidewall has an outer surface opposite to the cavity, and the bent portion extends away from the outer surface of the sidewall.

3. The backlight module of claim 1, wherein, The bent portion extends along at least two edges of the backboard.

4. The backlight module of claim 1, wherein, The at least one frame comprises the first frame and a second frame, the first frame is fixed on the backboard, and the second frame covers the first frame.

5. The backlight module of claim 4, wherein, The second frame comprises a fixed portion located on the side of the bottom plate away from the diffusion plate and fixedly connected to the bottom plate.

6. The backlight module of claim 5, wherein, The bottom plate has a recess located at the edge of the bottom plate, and the fixed portion of the frame is fixed in the recess of the bottom plate.

7. The backlight module of claim 1, wherein, The light source, the diffusion plate, and the optical film are arranged in a direction, the sidewall of the backboard comprises at least one protruding portion extending along the direction and abutting against the at least one frame.

8. The backlight module of claim 1, wherein, The optical film has a through hole, and the backboard further comprises a hanging ear structure protruding from the bent portion away from the bottom plate and penetrating through the through hole of the optical film.

9. A display device, characterized by comprising: The backlight module comprises: a backlight module as claimed in claim 1; and a display panel disposed on the side of the at least one frame of the backlight module away from the optical film.

10. A method of assembling a backlight module, characterized by, The backlight module comprises: providing a backboard comprising a bottom plate, a sidewall, and a bent portion, the sidewall connecting the bottom plate and the bent portion, wherein the bent portion has a first surface facing the bottom plate and a second surface opposite to the first surface; disposing a light source on the bottom plate of the backboard and making the light source face a first direction; moving a diffusion plate in the opposite direction of the first direction to the second surface of the bent portion; moving an optical film in the opposite direction of the first direction to the diffusion plate; and A frame is covered on the side wall of the back plate and covered on the edge portion of the optical film away from the bending portion, wherein the frame comprises a first covering portion and a second covering portion, the first covering portion is covered on the outside of the side wall, the second covering portion is connected with the first covering portion and extends laterally from the first covering portion, so that a gap is reserved between the second covering portion and the bending portion, the edge portion of the diffusion plate and the edge portion of the optical film are located in the gap and completely located on the inside of the first covering portion.

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