Backlight module and display device

Abstract

The present invention provides a backlight module and a display device. The backlight module includes a carrier, a light source, a light guide plate and a pressing unit. The carrier includes a carrier portion and a side wall arranged on the side of the carrier portion. The light source is arranged on the carrier portion. The light guide plate is arranged on the carrier portion. The light incident surface of the light guide plate is adjacent to the light source. The pressing unit includes a flat plate portion, a side plate portion and a bottom plate portion. The flat plate portion extends in a horizontal direction and covers the light source. The flat plate portion has a pressing surface against the top surface of the side wall and the optical surface of the light guide plate. The side plate portion is connected to the flat plate portion and extends in a vertical direction. The bottom plate portion is connected to the side plate portion and extends in a horizontal direction, wherein the bottom plate portion is against the bottom surface of the carrier portion.

Description

Technical Field

[0001] The invention relates to a light source module, and in particular to a backlight module and application thereof on a display device. Background Art

[0002] The display device mainly includes a backlight module, a plastic frame and a display panel, and the display panel is mainly carried on the backlight module through the plastic frame. Among them, the backlight module mainly includes a back plate and a light guide plate, an optical film and a light source arranged in the back plate.

[0003] After a period of use, the light guide plate and the plastic frame near the light source will deform or warp due to heat, which will then stretch the plastic frame. This will cause the light from the light source to leak out, seriously affecting the optical effect of the backlight module. In addition, this design requires multiple screws to be fastened, and the screws will penetrate the back panel of the backlight module, causing the light from the backlight module to leak easily from the fastening point of the back panel. Summary of the invention

[0004] Therefore, an object of the present invention is to provide a backlight module and a display device that are easy to assemble and have good stability.

[0005] According to the above-mentioned purpose of the present invention, a backlight module is provided. This backlight module includes a carrier, a light source, a light guide plate and a pressing unit. The carrier includes a carrier portion and a side wall arranged on the side of the carrier portion. The light source is arranged on the carrier portion. The light guide plate is arranged on the carrier portion, wherein the light incident surface of the light guide plate is adjacent to the light source. The pressing unit includes a flat plate portion, a side plate portion and a bottom plate portion. The flat plate portion extends in a horizontal direction and covers the light source. The flat plate portion has a pressing surface against the top surface of the side wall and the optical surface of the light guide plate. The side plate portion is connected to the flat plate portion and extends in a vertical direction. The bottom plate portion is connected to the side plate portion and extends in a horizontal direction, wherein the bottom plate portion is against the bottom surface of the carrier portion.

[0006] According to an embodiment of the present invention, the first distance between the flat plate portion and the bottom plate portion is equal to the second distance between the top surface of the side wall and the bottom surface of the bearing portion.

[0007] According to an embodiment of the present invention, the side plate portion of the pressing unit is attached to the outer side surface of the side wall of the carrier, and the light source is attached to the inner side surface of the side wall of the carrier.

[0008] According to an embodiment of the present invention, the bearing part of the bearing member has a back cover, a side strip and a recessed structure. The side strip is arranged on the side of the back cover, and the recessed structure is recessed from the bottom surface of the side strip. The bottom plate of the pressing unit is located in the recessed structure.

[0009] According to an embodiment of the present invention, there is a first distance between the flat plate portion and the bottom plate portion, and there is a second distance between the top surface of the side wall and the bottom surface of the recessed structure. The first distance is equal to the second distance.

[0010] According to an embodiment of the present invention, the backlight module comprises at least one first joint portion and at least one second joint portion. The second joint portion is disposed on the carrier, and the first joint portion is fixed to the second joint portion. The first joint portion presses the side plate portion of the pressing unit against the side wall of the carrier.

[0011] According to an embodiment of the present invention, the first combining part has a head and a rod connected to the head. The second combining part is a fixing hole, wherein the head of the first combining part abuts against the side plate of the pressing unit, and the rod is fixed in the fixing hole.

[0012] According to an embodiment of the present invention, the second combination portion includes a fixing hole and a sleeve, wherein the fixing hole is arranged on the bearing member, and the sleeve is fixed in the fixing hole. The first combination portion has a head portion and a rod portion connected to the head portion, wherein the head portion abuts against the surface of the side plate portion, and the rod portion is fixed in the sleeve.

[0013] According to an embodiment of the present invention, the side plate of the pressing unit has at least one slot, and the position of the slot corresponds to the second coupling portion. The first coupling portion passes through the slot and is fixed in the second coupling portion.

[0014] According to an embodiment of the present invention, the backlight module further comprises a plurality of optical films which are arranged above the light guide plate, wherein one side of the uppermost optical film is located on the flat plate portion of the pressing unit.

[0015] According to the above object of the present invention, a display device is further provided. The display device comprises the aforementioned backlight module and a display panel. One side of the display panel is supported on a flat plate portion of a pressing unit.

[0016] As can be seen from the above embodiments of the present invention, the pressing unit of the present invention has a design of a flat plate portion, a side plate portion, and a bottom plate portion, which can achieve the goal of clamping and fixing the light guide plate to prevent the portion of the light guide plate close to the light source from warping due to heat. In addition, the full-plane design of the top surface of the flat plate portion of the pressing unit can not only provide a larger area to carry the display panel, but also provide peripheral components such as optical films or optical adhesives in the backlight module to extend thereon, so as to reduce the width of the black border of the display panel, thereby achieving an extremely narrow border or borderless design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] For a more complete understanding of the embodiments and their advantages, reference is now made to the following description in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is a schematic diagram showing a display device according to an embodiment of the present invention;

[0019] Figure 2is an exploded schematic diagram showing a display device according to an embodiment of the present invention;

[0020] Figure 3 is a cross-sectional schematic diagram showing a display device according to an embodiment of the present invention;

[0021] Figure 4 is a cross-sectional schematic diagram showing another position of a display device according to an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram showing a device in which a first combining portion is combined with a second combining portion according to another embodiment of the present invention;

[0023] Figure 6 is a schematic diagram showing a display device according to an embodiment of the present invention; and

[0024] Figure 7 FIG. 4 is a schematic diagram showing a display device according to another embodiment of the present invention. DETAILED DESCRIPTION

[0025] Also refer to Figure 1 and Figure 2 , which are a schematic diagram and an exploded diagram respectively showing a display device according to an embodiment of the present invention. The display device 300 of this embodiment includes a backlight module 100 and a display panel 200 arranged in front of the backlight module 100. The backlight module 100 mainly includes a carrier 110, a light source 120, a light guide plate 130, a pressing unit 140 and a plurality of optical films 150.

[0026] like Figure 1 and Figure 2 As shown, the carrier 110 includes a carrier portion 111 and a side wall 112. The carrier portion 111 extends along a horizontal direction (e.g., the Y direction shown in the figure), and the side wall 112 is disposed on a side edge of the carrier portion 111 and extends along a vertical direction (e.g., the Z direction shown in the figure). In one example, the carrier portion 111 and the side wall 112 together form an L-shaped structure. In this embodiment, the light source 120 and the light guide plate 130 are disposed in the carrier 110. Specifically, the light source 120 and the light guide plate 130 are located on the carrier portion 111, wherein the light source 120 is attached to the inner side surface of the side wall 112, and the light incident surface 131 of the light guide plate 130 is adjacent to the light source 120.

[0027] In the embodiment, the carrying portion 111 has a back cover portion 111a, a side strip 111b and a recessed structure 111c. The side strip 111b is disposed on the side of the back cover portion 111a. Figure 2 As shown, the side strip 111b is a convex strip structure extending along the X direction. The concave structure 111c is concave from the bottom surface of the side strip 111b.

[0028] Refer again Figure 1 and Figure 2 , the pressing unit 140 includes a flat plate portion 141, a side plate portion 142 and a bottom plate portion 143. Among them, the top surface of the flat plate portion 141 is a full-plane design, configured to carry the display panel 200. The side plate portion 142 extends along a vertical direction (for example, the Z direction shown in the figure), and the flat plate portion 141 and the bottom plate portion 143 are respectively connected to the opposite sides of the side plate portion 142 along the Z direction, and extend along a horizontal direction (for example, the Y direction shown in the figure). In one example, the flat plate portion 141, the side plate portion 142 and the bottom plate portion 143 together form a C-shaped structure, and its notch faces the carrier 110. Thereby, the pressing unit 140 can be assembled to the carrier 110 along the horizontal direction (that is, the Y direction shown in the figure).

[0029] Refer to Figure 3 , which is a cross-sectional schematic diagram showing a display device according to an embodiment of the present invention. Figure 2 As shown, there is a first distance A1 between the flat plate portion 141 and the bottom plate portion 143, and there is a second distance A2 between the top surface of the side wall 112 of the carrier 110 and the bottom surface of the recessed structure 111c. The first distance A1 is approximately equal to the second distance A2. Thus, when the pressing unit 140 is mounted on the carrier 110, the flat plate portion 141 of the pressing unit 140 covers the light source 120, and the pressing surface 141a of the flat plate portion 141 abuts against the top surface of the side wall 112 and the optical surface 132 (e.g., light emitting surface) of the light guide plate 130. In addition, the side plate portion 142 is attached to the outer surface of the side wall 112 of the carrier 110, and the bottom plate portion 143 is located in the recessed structure 111c on the bottom surface of the carrier 111 and abuts against the bottom surface of the recessed structure 111c to limit the pressing unit 140 from moving along the X direction. Furthermore, since the pressing surface 141a of the flat plate portion 141 abuts against the top surface of the side wall 112 and the optical surface 132 (e.g., the light emitting surface) of the light guide plate 130, and the bottom plate portion 143 abuts against the bottom surface of the recessed structure 111c, the pressing unit 140 can be restricted from moving along the Z direction by the abutment of the flat plate portion 141 and the bottom plate portion 143. It can be seen that the pressing unit 140 can press the portion of the light guide plate 130 close to the light source 120, thereby preventing the portion of the light guide plate 130 close to the light source 120 from being deformed due to heat. In some examples, the pressing unit 140 can be a metal member with elasticity, which can be fixed on the carrier 110 by clamping.

[0030] In this embodiment, the design of the recessed structure 111c can not only reduce the overall thickness of the backlight module 100, but also limit the movement of the pressing unit 140 along the X direction. In addition, the design of the pressing unit 140 of this embodiment indirectly pressing the light guide plate 130 through the spacer S1 is not intended to limit the present invention. In other embodiments, the thickness of the spacer S1 can be adjusted according to the thickness of the light guide plate, or the flat plate portion 141 of the pressing unit 140 can also directly contact and press the optical surface 132 of the light guide plate 130.

[0031] Also refer to Figure 2 and Figure 4 ,in Figure 4 is a cross-sectional schematic diagram showing another position of a display device according to an embodiment of the present invention. In the present embodiment, the backlight module 100 further includes at least one first combining portion 160 and at least one second combining portion 170. The second combining portion 170 is disposed on the carrier 110, for example, it can be disposed on the side wall 112 of the carrier 110 or on the carrier 111. The first combining portion 160 is fixed to the second combining portion 170. The first combining portion 160 is configured to press the side plate portion 142 of the pressing unit 140 against the side wall 112 of the carrier 110. In a specific example, the first combining portion 160 is a fixing member having a head portion 161 and a rod portion 162 connected to the head portion 161. The second combining portion 170 is disposed in a fixing hole on the side wall 112 of the carrier 110 or on the carrier 111. Thus, the rod portion 162 of the first joint portion 160 can pass through the side plate portion 142 of the pressing unit 140 and be fixed in the second joint portion 170, and the head portion 161 of the first joint portion 160 is attached to the side plate portion 142 of the pressing unit 140, so the pressing unit 140 can be fixed on the carrier 110 through the first joint portion 160 and the second joint portion 170. In this embodiment, the second joint portion 170 is in the form of a blind hole, which does not penetrate the side wall 112 or the carrier portion 111 of the carrier 110, thereby preventing light from leaking from the locking position when the light source 120 emits light, thereby effectively improving the problem of local light leakage.

[0032] like Figure 2As shown, in some embodiments, a slot 142a may be provided on the side plate portion 142 of the pressing unit 140 at a position corresponding to the second coupling portion 170. The first coupling portion 160 passes through the slot 142a and is fixed in the second coupling portion 170. Specifically, the rod portion 162 of the first coupling portion 160 may pass through the slot 142a of the pressing unit 140 and be fixed to the second coupling portion 170 on the carrier 110, and the head portion 161 of the first coupling portion 160 abuts against the peripheral edge of the side plate portion 142 of the pressing unit 140 near the slot 142a. In some examples, the pressing unit 140 may be formed by bending sheet metal, and the sheet metal may be firstly punched out with a slot and then bent to obtain the pressing unit 140 having the slot 142a of the present invention. As shown in FIG. Figures 2 to 4 As shown, in this embodiment, the display device 300 further includes an appearance frame 310 disposed outside the backlight module 100 to shield the pressing unit 140 and the head 161 of the first combining portion 160 .

[0033] In other embodiments, refer to Figure 1 and Figure 5 ,in Figure 5 1 is a schematic diagram showing a device in which a first coupling portion is coupled to a second coupling portion according to another embodiment of the present invention. In other embodiments, the second coupling portion 170' may include a fixing hole 171 and a sleeve 172. The fixing hole 171 is provided on the carrier 110, the sleeve 172 is fixed in the fixing hole 171, and a portion of the sleeve 172 protrudes into the side plate portion 142 of the pressing unit 140. The rod portion 162 of the first coupling portion 160 is fixed in the sleeve 172, and the head portion 161 of the first coupling portion 160 abuts against the outer surface of the side plate portion 142 of the pressing unit 140.

[0034] Refer again Figure 3 and Figure 4 , the optical film 150 is disposed above the light guide plate 130. In the present embodiment, one side of the optical film 150 located at the top is located on the flat plate portion 141 of the pressing unit 140. That is to say, the area of ​​the optical film 150 located at the top is slightly larger than the optical film 150 located at the bottom, so one side thereof extends to the flat plate portion 141 of the pressing unit 140. Therefore, when the display panel 200 is carried on the flat plate portion 141 of the pressing unit 140, by extending one side of the top optical film 150 to the flat plate portion 141 of the pressing unit 140, the width W1 of the black border region (BM region) of the display panel 200 can be reduced, thereby meeting the requirement of a narrow frame.

[0035] In the present invention, the support member and the pressing unit may have different structural designs. Figure 6, which is a schematic diagram of a display device according to an embodiment of the present invention. The structure of the display device 500 of this embodiment is substantially the same as that of the aforementioned display device 300, and the only difference is that the backlight module 400 in the display device 500 is designed differently. The carrier 410 of the backlight module 400 of this embodiment includes a carrier portion 411 and a side wall 412 disposed on one side of the carrier portion 411, wherein the bottom surface of the carrier portion 411 does not have a groove. The pressing unit 440 includes a flat plate portion 441, a side plate portion 442, and a bottom plate portion 443.

[0036] Continue to refer to Figure 6 In the present embodiment, the distance between the flat plate portion 441 and the bottom plate portion 443 is equal to the distance between the top surface of the side wall 412 of the carrier 410 and the bottom surface of the side wall 412 of the carrier 410. Thus, when the pressing unit 440 is mounted on the carrier 410, the flat plate portion 441 of the pressing unit 440 covers the light source 120, and the pressing surface 441a of the flat plate portion 441 abuts against the top surface of the side wall 412 and the optical surface (e.g., the light emitting surface) of the light guide plate 130. In addition, the side plate portion 442 of the pressing unit 440 is attached to the outer surface of the side wall 412 of the carrier 410. Similarly, the pressing unit 440 and the carrier 410 of the present embodiment may also be connected as follows. Figure 2 The first combining portion 160 and the second combining portion 170 are fixed to each other to achieve the same effect, so they are not described again.

[0037] In the present invention, the appearance frame can also have different structural designs. Referring to FIG. 7 , it is a schematic diagram of a display device according to another embodiment of the present invention. The structure of the display device 600 of this embodiment is substantially the same as that of the aforementioned display device 300 , except that the structural design of the appearance frame 610 in the display device 600 is different. Figure 7 As shown, in this embodiment, the appearance frame 610 has an opening 610a, and the first joint portion 160 passes through the opening 610a and the pressing unit 140, and is then joined to the carrier 110. Therefore, the first joint portion 160 can not only fix the appearance frame 610 on the backlight module 100, but also further press the side plate portion 142 of the pressing unit 140 against the carrier 110. It can be seen that by simultaneously fixing the appearance frame and the pressing unit 140 with the same first joint portion 160 (generally a fixing member in the form of a screw), there is no need to design a structure for the appearance frame 610 and the pressing unit 140 to be connected to each other, thereby reducing the number of screws used and making the overall assembly process simpler and more time-saving.

[0038] On the other hand, the appearance frame 610 of the present embodiment is a stepped structure design, including a first step 611 and a second step 612, wherein the thickness of the first step 611 is greater than that of the second step 612. In a normal use state, that is, when the display panel 200 faces the user, the first step 611 of the appearance frame 610 facing the user shields the second step 612, so by setting the head 161 of the first joint 160 on the second step 612 of the appearance frame 610, the head 161 of the first joint 160 can be shielded by the first step 611 with a larger thickness in front, that is, when the user views the display panel 200, the second step 612 of the appearance frame 610 and the first joint 160 disposed thereon will not be seen, thereby making the appearance of the overall display device 600 more beautiful.

[0039] As can be seen from the above embodiments of the present invention, the pressing unit of the present invention has a design of a flat plate portion, a side plate portion, and a bottom plate portion, which can achieve the goal of clamping and fixing the light guide plate to prevent the portion of the light guide plate close to the light source from warping due to heat. In addition, the full-plane design of the top surface of the flat plate portion of the pressing unit can not only provide a larger area to carry the display panel, but also provide peripheral components such as optical films or optical adhesives in the backlight module to extend thereon, so as to reduce the width of the black border of the display panel, thereby achieving an extremely narrow border or borderless design.

[0040] In addition, the pressing unit of the present invention extends its structure to a more advanced use. In addition to preventing the portion of the light guide plate close to the light source from warping due to heat, it also provides a larger area to carry peripheral components such as the display panel, optical film or optical adhesive, thereby reducing the width of the black border of the display panel. On the other hand, the way in which the first and second combining parts of the present invention are fixed to each other can not only reduce the number of fixing parts used, but also achieve technical effects such as simplifying the overall assembly process, making the appearance more beautiful, and effectively improving local light leakage. Moreover, the overall configuration of the backlight module of the present invention can create a narrower and smaller black border area (BM area), thereby deriving a structural design suitable for ultra-thin TVs with no borders on all four sides. When the present invention is applied to TV products, it can take into account the benefits of space and functional use, thereby reaching a new level of ultra-thin TV design with no borders on all four sides.

[0041] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be based on the scope defined by the claims.

[0042] Explanation of symbols

[0043] 100 Backlight Module

[0044] 110 Bearing

[0045] 111 Load-bearing unit

[0046] 111a Back cover

[0047] 111b Edge strip

[0048] 111c Concave structure

[0049] 112 Side Wall

[0050] 120 Light Source

[0051] 130 Light guide plate

[0052] 131 Light incident surface

[0053] 132 Optical surface

[0054] 140 Pressing unit

[0055] 141 Flat Plate

[0056] 141a Pressed surface

[0057] 142 Side panel

[0058] 143 Bottom plate

[0059] 150 Optical Film

[0060] 160 First joint

[0061] 161 Head

[0062] 162 Rod

[0063] 170 Second joint

[0064] 170' Second joint

[0065] 171 Fixing holes

[0066] 172 Sleeve

[0067] 200 Display Panel

[0068] 300 display devices

[0069] 310 exterior styling frame

[0070] 400 Backlight Module

[0071] 410 Bearing

[0072] 411 Load-bearing unit

[0073] 412 Side Wall

[0074] 440 Pressing Unit

[0075] 441 Flat Panel

[0076] 442 Side Panel

[0077] 443 Bottom plate

[0078] 500 Display devices

[0079] 600 Display devices

[0080] 610 Exterior styling parts

[0081] 610a Opening

[0082] 611 First Stage

[0083] 612 Second Stage

[0084] A1 First Distance

[0085] A2 Second distance

[0086] S1 Spacer

[0087] W1 Width.

Claims

1. A backlight module, characterized in that: include: A bearing member, comprising a bearing portion and a side wall arranged on a side of the bearing portion; A light source is arranged on the carrying portion; A light guide plate, disposed on the bearing portion, wherein a light incident surface of the light guide plate is adjacent to the light source; as well as Pressing unit, comprising: A flat plate portion extending in a horizontal direction and covering the light source, wherein the flat plate portion has a pressing surface against the top surface of the side wall and the optical surface of the light guide plate; A side plate portion connected to the flat plate portion and extending in a vertical direction; and a bottom plate portion connected to the side plate portions and extending along the horizontal direction, wherein the bottom plate portion abuts against the bottom surface of the bearing portion, Wherein, the bearing portion of the bearing member has a back cover portion, a side strip and a recessed structure, the side strip is arranged on a side of the back cover portion, and the recessed structure is recessed from a bottom surface of the side strip; and The bottom plate portion of the pressing unit is located in the recessed structure.

2. The backlight module according to claim 1, characterized in that There is a first distance between the flat plate portion and the bottom plate portion, A second distance exists between the top surface of the side wall and the bottom surface of the supporting portion; and The first distance is equal to the second distance.

3. The backlight module according to claim 1, characterized in that The top surface of the flat plate portion is designed to be a full plane.

4. The backlight module according to claim 1, characterized in that: The side plate portion of the pressing unit is attached to the outer side surface of the side wall of the carrier, and the light source is attached to the inner side surface of the side wall of the carrier.

5. The backlight module according to claim 1, characterized in that: There is a first distance between the flat plate portion and the bottom plate portion, and there is a second distance between the top surface of the side wall and the bottom surface of the recessed structure, wherein the first distance is equal to the second distance.

6. The backlight module according to claim 1, characterized in that: It also includes at least one first combining portion and at least one second combining portion, wherein the second combining portion is arranged on the supporting member, the first combining portion is fixed to the second combining portion, and the first combining portion is configured to press the side plate portion of the pressing unit against the side wall of the supporting member.

7. The backlight module according to claim 6, characterized in that: The first combining portion has a head portion and a rod portion connected to the head portion, and the second combining portion is a fixing hole, wherein the head portion of the first combining portion abuts against the side plate portion of the pressing unit, and the rod portion is fixed in the fixing hole.

8. The backlight module according to claim 6, characterized in that: The second combining portion includes a fixing hole and a sleeve, wherein the fixing hole is disposed on the bearing component, and the sleeve is fixed in the fixing hole; and The first coupling portion comprises a head portion and a rod portion connected to the head portion, wherein the head portion abuts against a surface of the side plate portion, and the rod portion is fixed in the sleeve.

9. The backlight module according to any one of claims 6 to 8, characterized in that: The side plate portion of the pressing unit has at least one slot, the position of the slot corresponds to the second coupling portion, and the first coupling portion passes through the slot and is fixed in the second coupling portion.

10. The backlight module according to claim 1, characterized in that: It also includes a plurality of optical films, which are arranged above the light guide plate, wherein one side of the optical film located at the top is located on the flat plate portion of the pressing unit.

11. A display device, characterized in that: include: The backlight module according to any one of claims 1 to 10; as well as A display panel, wherein one side of the display panel is carried on the flat plate portion of the pressing unit.

Images