CN111754855A

CN111754855A - Backlight module and display device

Info

Publication number: CN111754855A
Application number: CN201910249931.8A
Authority: CN
Inventors: 黄镫仪; 赵永杰; 陈致尧
Original assignee: Radiant Opto Electronics Suzhou Co Ltd
Current assignee: Radiant Opto Electronics Suzhou Co Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2020-10-09

Abstract

The invention provides a backlight module and display equipment. The backlight module comprises a bearing piece, a light source, a light guide plate and a pressing unit. The bearing part comprises a bearing part and a side wall arranged on the side edge of the bearing part. The light source is arranged on the bearing part. The light guide plate is arranged on the bearing part. 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 the horizontal direction and covers the light source. The flat plate part is provided with a pressing surface which is abutted against the top surface of the side wall and the optical surface of the light guide plate. The side plate portion connects the flat plate portions and extends in the vertical direction. The bottom plate part is connected with the side plate part and extends along the horizontal direction, wherein the bottom plate part abuts against the bottom surface of the bearing part.

Description

Backlight module and display device

Technical Field

The present invention relates to a light source module, and more particularly, to a backlight module and an application thereof in a display device.

Background

The display device mainly comprises a backlight module, a rubber frame and a display panel, wherein the display panel is mainly borne on the backlight module through the rubber frame. The backlight module mainly comprises a back plate, a light guide plate arranged in the back plate, an optical diaphragm and a light source.

After the backlight module is used for a period of time, the light guide plate and the portion of the plastic frame close to the light source are deformed or warped due to heating, and the plastic frame is further opened. Therefore, light from the light source leaks out, and the optical effect of the backlight module is seriously affected. In addition, the design needs to lock multiple screws, and the screws can penetrate through the back plate of the backlight module, so that light is emitted by the backlight module, and light is easily leaked from the locking position of the back plate.

Disclosure of Invention

Therefore, an object of the present invention is to provide a backlight module and a display device with easy assembly and good stability.

According to the above object of the present invention, a backlight module is provided. The backlight module comprises a bearing piece, a light source, a light guide plate and a pressing unit. The bearing part comprises a bearing part and a side wall arranged on the side edge of the bearing part. The light source is arranged on the bearing part. The light guide plate is arranged on the bearing part, 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 the horizontal direction and covers the light source. The flat plate part is provided with a pressing surface which is abutted against the top surface of the side wall and the optical surface of the light guide plate. The side plate portion connects the flat plate portions and extends in the vertical direction. The bottom plate part is connected with the side plate part and extends along the horizontal direction, wherein the bottom plate part abuts against the bottom surface of the bearing part.

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

According to the embodiment of the invention, the side plate part of the pressing unit is attached to the outer side surface of the side wall of the bearing piece. The light source is attached to the inner side face of the side wall of the bearing piece.

According to an embodiment of the present invention, the supporting portion of the supporting member has a back cover portion, an edge bar and a recess structure. The side edge of the back cover part is provided with the edge strip, and the concave structure is recessed from the bottom surface of the edge strip. The bottom plate part of the pressing unit is positioned in the concave structure.

According to an embodiment of the present invention, the flat plate portion and the bottom plate portion have a first distance therebetween. A second distance is formed 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.

According to an embodiment of the present invention, the backlight module includes at least one first combining portion and at least one second combining portion. The second combining part is arranged on the bearing part, and the first combining part is fixed on the second combining part. The first combining part enables the side plate part of the pressing unit to be tightly abutted against the side wall of the bearing piece.

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

According to an embodiment of the present invention, the second coupling portion includes a fixing hole and a sleeve, wherein the fixing hole is disposed on the supporting member, and the sleeve is fixed in the fixing hole. The first combining part is provided with a head part and a rod part connected with the head part, wherein the head part abuts against the surface of the side plate part, and the rod part is fixed in the sleeve.

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

According to an embodiment of the present invention, the backlight module further includes a plurality of optical films. The optical diaphragms are arranged above the light guide plate, wherein one side of the optical diaphragm positioned at the uppermost position is positioned on the flat plate part of the pressing unit.

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

In the above embodiments of the present invention, the pressing unit has a flat plate portion, a side plate portion and a bottom plate portion, so as to press the light guide plate in a clamping and fixing manner, and prevent the portion of the light guide plate close to the light source from being warped due to heat. In addition, by the full-plane design of the top surface of the flat plate part of the pressing unit, a large area can be provided for bearing the display panel, and peripheral parts such as optical films or optical adhesives in the backlight module can also be arranged on the display panel in an extending mode, so that the black edge width of the display panel is reduced, and the design of an extremely narrow frame or no frame is achieved.

Drawings

For a more complete understanding of the embodiments and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:

fig. 1 is an apparatus diagram illustrating a display device according to an embodiment of the present invention;

fig. 2 is an exploded schematic view illustrating a display device according to an embodiment of the present invention;

fig. 3 is a schematic sectional view showing a display device according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view showing another position of a display device according to an embodiment of the present invention;

FIG. 5 is a schematic view illustrating an apparatus in which a first coupling portion is coupled to a second coupling portion according to another embodiment of the present invention;

FIG. 6 is an apparatus diagram illustrating a display device according to an embodiment of the present invention; and

fig. 7 is an apparatus diagram illustrating a display device according to another embodiment of the present invention.

Detailed Description

Referring to fig. 1 and 2, a schematic device diagram and an exploded schematic diagram of a display device according to an embodiment of the invention are shown, respectively. The display apparatus 300 of the present embodiment includes a backlight module 100 and a display panel 200 disposed 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.

As shown in fig. 1 and 2, the carrier 110 includes a carrier portion 111 and a sidewall 112. The supporting portion 111 extends along a horizontal direction (e.g., a Y direction shown in the figure), and the sidewall 112 is disposed at one side of the supporting portion 111 and extends along a vertical direction (e.g., a Z direction shown in the figure). In one example, the carrier 111 and the sidewall 112 together form an L-shaped structure. In the present 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 disposed on the supporting portion 111, wherein the light source 120 is attached to the inner side surface of the sidewall 112, and the light incident surface 131 of the light guide plate 130 is adjacent to the light source 120.

In the embodiment, the supporting portion 111 has a back cover portion 111a, an edge bar 111b and a concave structure 111 c. The edge strips 111b are provided on the side of the back cover 111a, and as shown in fig. 2, the edge strips 111b have a convex structure extending in the X direction. The recessed structure 111c is recessed from the bottom surface of the rim 111 b.

Referring again to fig. 1 and 2, the pressing unit 140 includes a flat plate portion 141, a side plate portion 142, and a bottom plate portion 143. The top surface of the flat plate portion 141 is designed to be a full plane and configured to carry the display panel 200. The side plate portions 142 extend in a vertical direction (e.g., a Z direction in the drawing), and the flat plate portions 141 and the bottom plate portions 143 are connected to opposite sides of the side plate portions 142 in the Z direction, respectively, and extend in a horizontal direction (e.g., a Y direction in the drawing). In one example, the flat plate portion 141, the side plate portions 142, and the bottom plate portion 143 together form a C-shaped structure with a gap facing the carrier 110. Thereby, the pressing unit 140 may be assembled to the carrier 110 along a horizontal direction (i.e., a Y direction shown in the drawing).

Reference is also made to fig. 3, which is a schematic cross-sectional view illustrating a display device according to an embodiment of the present invention. In the present embodiment, as shown in fig. 2, a first distance a1 is provided between the flat plate portion 141 and the bottom plate portion 143, and a second distance a2 is provided between the top surface of the side wall 112 of the carrier 110 and the bottom surface of the concave structure 111 c. Wherein the first distance A1 is approximately equal to the second distance A2. Therefore, 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 142 is attached to the outer surface of the side wall 112 of the carrier 110, and the bottom plate 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, so as to restrict the pressing unit 140 from moving along the X direction. Moreover, since the pressing surface 141a of the flat plate portion 141 abuts against the top surface of the sidewall 112 and the optical surface 132 (e.g., light-emitting surface) of the light guide plate 130, and the bottom plate portion 143 abuts against the bottom surface of the concave structure 111c, the pressing unit 140 can be prevented from moving along the Z direction by the abutting action of the flat plate portion 141 and the bottom plate portion 143. Therefore, 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 may be a metal member having elasticity, which may be fixed on the carrier 110 by clamping.

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

Referring to fig. 2 and 4 together, fig. 4 is a schematic cross-sectional view illustrating another position of a display device according to an embodiment of the present invention. In this embodiment, the backlight module 100 further includes at least one first combining portion 160 and at least one second combining portion 170. The second coupling portion 170 is disposed on the carrier 110, for example, may be disposed on the side wall 112 or the carrier 111 of the carrier 110. The first coupling portion 160 is fixed to the second coupling portion 170. The first coupling 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 one specific example, the first coupling portion 160 is a fastener having a head 161 and a stem 162 connected to the head 161. The second coupling portions 170 are disposed at the fixing holes on the side walls 112 or the carrier portion 111 of the carrier 110. Therefore, the rod portion 162 of the first combining portion 160 can penetrate through the side plate portion 142 of the pressing unit 140 and be fixed in the second combining portion 170, and the head portion 161 of the first combining portion 160 is attached to the side plate portion 142 of the pressing unit 140, so that the pressing unit 140 can be fixed on the carrier 110 through the first combining portion 160 and the second combining portion 170. In the embodiment, the second combining portion 170 is in the form of a blind hole, which does not penetrate through the side wall 112 or the supporting portion 111 of the supporting member 110, so as to prevent light from leaking from the locking position when the light source 120 emits light, thereby effectively improving the problem of local easy light leakage.

As shown in fig. 2, 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 is fixed in the second coupling portion 170 through the slot 142 a. Specifically, the rod portion 162 of the first coupling portion 160 may be fixed to the second coupling portion 170 on the carrier 110 through the slot 142a of the pressing unit 140, 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 142 a. In some examples, the pressing unit 140 may be formed by bending a sheet metal, and the pressing unit 140 having the groove 142a may be obtained by punching a groove in the sheet metal and then bending the sheet metal. As shown in fig. 2 to 4, in the present embodiment, the display device 300 further includes an outer shape frame 310 disposed outside the backlight module 100 to shield the pressing unit 140 and the head 161 of the first coupling portion 160.

In other embodiments, refer to fig. 1 and 5, wherein fig. 5 is a schematic view illustrating an apparatus for bonding a first bonding portion to a second bonding 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. Wherein a fixing hole 171 is provided on the carrier 110, a 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 press unit 140.

Referring again to fig. 3 and 4, the optical film 150 is disposed above the light guide plate 130. In the present embodiment, one side of the uppermost optical film 150 is positioned on the flat plate portion 141 of the pressing unit 140. That is, the area of the uppermost optical film 150 is slightly larger than that of the lower optical film 150, so that 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, the width W1 of the black Border (BM) of the display panel 200 can be reduced by extending one side of the uppermost optical film 150 onto the flat plate portion 141 of the pressing unit 140, so as to meet the requirement of a narrow frame.

In the invention, the carrier and the pressing unit can have different structural designs. Referring to fig. 6, there is a device diagram illustrating a display apparatus according to an embodiment of the present invention. The structure of the display apparatus 500 of the present embodiment is substantially the same as that of the display apparatus 300, and the only difference is that the backlight module 400 in the display apparatus 500 is designed differently. The carrier 410 of the backlight module 400 of the present embodiment includes a carrier 411 and a sidewall 412 disposed on one side of the carrier 411, wherein the bottom surface of the carrier 411 has no groove. The pressing unit 440 includes a flat plate portion 441, a side plate portion 442, and a bottom plate portion 443.

With continued reference to fig. 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. Therefore, 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., light emitting surface) of the light guide plate 130. In addition, the side plate portions 442 of the pressing unit 440 are attached to the outer surfaces of the side walls 412 of the carrier 410. Similarly, the pressing unit 440 and the supporting member 410 of the present embodiment can also be fixed to each other by the first combining portion 160 and the second combining portion 170 as shown in fig. 2, so as to achieve the same effect, and therefore, the description thereof is omitted.

In the invention, the appearance modeling frame can also have different structural designs. Referring to fig. 7, there is a device diagram illustrating a display apparatus according to another embodiment of the present invention. The structure of the display device 600 of the present embodiment is substantially the same as that of the display device 300 described above, and the only difference is the structural design of the exterior mold frame 610 in the display device 600. As shown in fig. 7, in the present embodiment, the outer mold frame 610 has an opening 610a, and the first coupling portion 160 is coupled to the carrier 110 after passing through the opening 610a and the pressing unit 140. Therefore, the first combining portion 160 can fix the appearance frame 610 on the backlight module 100, and can further press the side plate portion 142 of the pressing unit 140 against the carrier 110. Therefore, the same first coupling portion 160 (generally, a screw-shaped fixing member) is used to fix the exterior molding frame and the pressing unit 140 at the same time, so that it is not necessary to separately design a structure in which the exterior molding frame 610 and the pressing unit 140 can be butted with each other, thereby reducing the number of screws used and making the overall assembly process simpler and more time-saving.

On the other hand, the outer mold frame 610 of the present embodiment is designed to have a stepped structure, and includes a first step 611 and a second step 612, wherein the first step 611 has a larger thickness than the second step 612. In a normal use state, that is, when the display panel 200 faces a user, the appearance model frame 610 shields the second step portion 612 facing the first step portion 611 of the user, so that the head portion 161 of the first combining portion 160 is arranged on the second step portion 612 of the appearance model frame 610, so that the head portion 161 of the first combining portion 160 is shielded by the first step portion 611 with a larger front thickness, that is, when the user views the display panel 200, the second step portion 612 of the appearance model frame 610 and the first combining portion 160 arranged thereon are not seen, thereby the appearance of the whole display device 600 is more beautiful.

In addition, the pressing unit of the invention extends to be used more advanced according to the structure, not only can prevent the part of the light guide plate close to the light source from warping due to heating, but also provides a larger area for bearing peripheral materials such as a display panel, an optical film or optical cement, and the like, thereby reducing the width of the black edge of the display panel. On the other hand, the way of fixing the first combining part and the second combining part mutually can reduce the number of the fixing parts, and also can achieve the technical effects of simplifying the whole assembly process, making the appearance more beautiful, effectively improving local easy light leakage and the like. Moreover, the overall configuration of the backlight module of the present invention can create a narrower and smaller black border area (BM area), thereby extending the structural design suitable for the ultra-thin TV with four borders and no frame. When the invention is applied to TV products, the invention can give consideration to space and function use benefits, thereby achieving a new level of ultra-thin TV design with four sides without frames.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Description of the symbols

100 backlight module

110 bearing parts

111 bearing part

111a back cover part

111b edging

111c recess structure

112 side wall

120 light source

130 light guide plate

131 light incident surface

132 optical surface

140 press unit

141 flat plate part

141a press face

142 side plate part

143 bottom plate part

150 optical film

160 first joining part

161 head

162 rod part

170 second joint part

170' second joint part

171 fixing hole

172 sleeve

200 display panel

300 display device

310 appearance modeling frame

400 back light module

410 bearing part

411 bearing part

412 side wall

440 press unit

441 flat plate part

442 side plate part

443 bottom plate part

500 display device

600 display device

610 appearance molding

610a opening

611 first stage

612 second step section

A1 first distance

A2 second distance

S1 spacer

W1 width.

Claims

1. A backlight module, comprising:

the bearing part comprises a bearing part and side walls arranged on the side edges of the bearing part;

the light source is arranged on the bearing part;

the light guide plate is arranged on the bearing part, and the light incident surface of the light guide plate is adjacent to the light source; and

a press unit comprising:

the flat plate part extends along the horizontal direction and covers the light source, and the flat plate part is provided with a pressing surface which abuts against the top surface of the side wall and the optical surface of the light guide plate;

a side plate portion that connects the flat plate portions and extends in a vertical direction; and a bottom plate portion connected to the side plate portion and extending along the horizontal direction, wherein the bottom plate portion abuts against a bottom surface of the bearing portion.

2. The backlight module of claim 1, wherein the light source comprises a light source

A first distance is formed between the flat plate part and the bottom plate part;

a second distance is reserved between the top surface of the side wall and the bottom surface of the bearing part; and

the first distance is equal to the second distance.

3. The backlight module of claim 1, wherein the side plate of the pressing unit is attached to an outer side surface of the side wall of the supporting member, and the light source is attached to an inner side surface of the side wall of the supporting member.

4. The backlight module of claim 1,

the bearing part of the bearing part is provided with a back cover part, side strips and a concave structure, wherein the side strips are arranged on the side edges of the back cover part, and the concave structure is recessed from the bottom surfaces of the side strips; and

the bottom plate portion of the press unit is located in the recessed structure.

5. The backlight module of claim 4, wherein the plate portion and the bottom plate portion have a first distance therebetween, and the top surface of the sidewall and the bottom surface of the recess structure have a second distance therebetween, wherein the first distance is equal to the second distance.

6. The backlight module of claim 1, further comprising at least one first combining portion and at least one second combining portion, wherein the second combining portion is disposed on the carrier, 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 carrier.

7. The backlight module of claim 6, wherein 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 of claim 6,

the second combining part comprises a fixing hole and a sleeve, wherein the fixing hole is formed in the bearing piece, and the sleeve is fixed in the fixing hole; and

the first combining part is provided with a head part and a rod part connected with the head part, wherein the head part abuts against the surface of the side plate part, and the rod part is fixed in the sleeve.

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

10. The backlight module of claim 1, further comprising a plurality of optical films disposed above the light guide plate, wherein one side of the optical film positioned at the top is positioned on the flat plate portion of the pressing unit.

11. A display device, comprising:

a backlight module according to any one of claims 1 to 10; and

a display panel, wherein one side of the display panel is carried on the flat plate portion of the pressing unit.