WO2013078717A1

WO2013078717A1 - Backlight module and liquid crystal display device

Info

Publication number: WO2013078717A1
Application number: PCT/CN2011/083580
Authority: WO
Inventors: 杨瑞连; 张庞岭
Original assignee: 深圳市华星光电技术有限公司
Priority date: 2011-12-02
Filing date: 2011-12-06
Publication date: 2013-06-06
Also published as: CN102494276B; CN102494276A

Abstract

A backlight module and a liquid crystal display device comprising the backlight module. The backlight module (20) comprises an aluminum extrusion (21), a light strip (22) provided with multiple LED lamps (224), a component (23) disposed on the aluminum extrusion (21), and a light guide plate (24). The component (23) can reflect light. Fitting holes (235) for accommodating the LED lamps (224) are disposed on the component (23). The light strip (22) is borne on the component (23) and adheres to one side of the component (23). The LED lamps (224) are correspondingly disposed in the fitting holes (235). A light incident surface (242) of the light guide plate (24) adheres to the other side of the component (23). A light-emitting surface of the LED lamp (224) is closely adjacent to the light incident surface (242). The component (23) has light reflection and thermal insulation functions, and therefore can substitute for a plastic frame, and a reflective piece and a rubber member on the aluminum extrusion in the conventional backlight structure. The structure is simple, and the utilization of light is improved.

Description

[Technical Field]

The invention relates to a backlight module of an electronic product, in particular to a backlight module and a liquid crystal display device. 【Background technique】

At present, a liquid crystal display device has been widely used as a display member of an electronic device in various electronic products, and a backlight module is one of important components of a liquid crystal display device. Referring to FIG. 1 , a conventional LED edge-light type backlight module includes a light guide plate 11 and an LED lamp 12 disposed on one side of the light guide plate. The light guide plate 11 and the LED lamp 12 are matched with the LED frame by an aluminum extrusion 13 14 is fixed, the light guide plate 11 is carried on the aluminum extrusion 13, and the LED lamp 12 is disposed on the aluminum extrusion 13 and located on one side of the light guide plate 11. In order to improve the utilization of the light of the LED lamp 12, the reflection sheet 15 is attached directly above and below the light-emitting surface of the LED lamp 12, that is, the corresponding portions on the aluminum extrusion 13 and the plastic frame 14 are respectively attached with the reflection sheet 15, and at the same time, in order to prevent aluminum extrusion The heat of 13 is transmitted to the light guide plate 11 to expand the light guide plate 11, and the rubber body 16 is attached to the aluminum extrusion 13 to support the light guide plate 11, thereby providing heat insulation.

However, in the LED side-light type backlight module, the reflection sheet 15 is attached directly above and below the LED lamp 12. Since the space is relatively small, the operation is difficult and time-consuming; and the light guide plate 11 and the light-emitting surface of the LED lamp 12 are shortened. The gap can improve the utilization of the light source well, but the gap between the light guide plate 11 and the light emitting surface of the LED lamp 12 cannot be infinitely small, because it is considered that the LED light 12 may be caused when the light guide plate 11 is thermally expanded. 12 fails, so there must be a certain gap between the light guide plate 11 and the light emitting surface of the LED lamp 12, but the presence of the gap is not conducive to improving the utilization of the light source; the aluminum body 13 is attached with the rubber body 16 to block heat conduction to the light guide plate 11. However, the rubber body 16 requires cost, and the rubber body 16 requires labor. This is not conducive to cost reduction.

[Summary of the Invention]

In view of the above, the technical problem to be solved by the present invention is to provide a backlight module, which can improve the utilization rate of the light source and can reduce the cost. In order to solve the above technical problem, a technical solution adopted by the present invention is: providing a backlight module and a liquid crystal display device, including an aluminum extrusion, a light bar, a member, and a light guide plate, wherein the aluminum is extruded to set the member, the light bar a plurality of LED lamps are disposed on the device, the backlight module further includes a member having a function of reflecting light, the member is provided with a matching hole for accommodating the LED lamp, and the member is disposed on the aluminum, The light bar is carried on the component and is attached to one side of the component, and the LED lamp is correspondingly sleeved into the matching hole, and the other side of the light incident surface of the light guide plate is attached to the component, and the LED light is illuminated. The surface is adjacent to the light incident surface of the light guide plate.

Wherein, the light guide plate is carried on the member, and the position where the member is in contact with the light guide plate is made of a heat insulating material.

There are a plurality of matching holes formed in the member, and the number thereof is corresponding to the number of LED lights on the light bar.

The member includes a bottom wall and a matching wall protruding from the bottom wall, and the plurality of matching holes are defined in the mating wall.

The plurality of matching holes are opened at equal intervals in a line and each of the matching holes penetrates both sides of the matching wall.

Wherein the member comprises a support wall protruding from the bottom wall, the mating wall is parallel to the support wall and the mating wall is higher than the support wall, and the support wall supports the light guide plate.

The mating wall is disposed on a side adjacent to the bottom wall and forms an end edge with the bottom wall on the side, the end edge carrying the light bar.

The light bar includes a main body plate and the plurality of LED lights disposed on the main body plate, and the plurality of LED lights are protruded on the main body plate in a line and at equal intervals.

Wherein, the aluminum extrusion comprises a bottom plate and a side plate perpendicularly connected to the bottom plate, the bottom plate carrying the member, and the light bar is disposed between the mating wall and the side plate.

Wherein, the light incident surface of the light guide plate is attached to the side surface of the mating wall and adjacent to the light emitting surface of the LED lamp, and the inner wall of the matching hole has a light reflecting effect, so that the light emitted by the LED lamp is reflected and then enters the guide. Light board. The top of one side of the mating wall is formed with a top edge that is flush with the end edges and parallel to each other.

Wherein the member is made of a material having a retroreflective effect, or is coated on the substrate with a coating having a reflective effect.

A liquid crystal display device includes the above backlight module.

The beneficial effects of the present invention are: different from the prior art, the member in the backlight module of the present invention has the function of reflecting light, thereby replacing the plastic frame in the conventional backlight structure and the reflective sheet extruded on the aluminum; and the light entering the light guide plate The surface is directly placed on the member, and the gap between the light guide plate and the light emitting surface of the LED lamp can be reduced infinitely to improve the utilization of light; and the member is insulated, the member directly carries the light guide plate, and the aluminum extrusion can be insulated. The heat conduction to the light guide plate causes the light guide plate to expand, and the rubber body supported on the aluminum does not need to support the light guide plate.

[Description of the Drawings]

1 is a schematic cross-sectional view of a conventional backlight module;

2 is an exploded perspective view showing a first preferred embodiment of the backlight module of the present invention;

3 is a schematic structural view of the backlight module shown in FIG. 1 after assembly;

4 is a cross-sectional view of the backlight module shown in FIG. 3;

Figure 5 is a partially enlarged schematic view of the member;

6 is an exploded perspective view showing a second preferred embodiment of the backlight module of the present invention;

7 is a schematic structural view of the backlight module shown in FIG. 5 after assembly;

8 is a schematic cross-sectional view of the backlight module shown in FIG. 6;

Figure 9 is a partially enlarged schematic view of the member.

【detailed description】

The detailed description of the technical contents, structural features, objects, and effects of the present invention will be described in detail below with reference to the embodiments. Referring to FIG. 2, a backlight module 20 according to a first preferred embodiment of the present invention includes an aluminum extrusion 21, a light bar 22, a member 23, and a light guide plate 24.

The aluminum extrusion 21 includes a bottom plate 212 and side plates 214 that are vertically connected to the bottom plate 212. The member 23 is carried on the bottom plate 212.

The light bar 22 includes a main body panel 222 and a plurality of LED lamps 224 disposed on the main body panel 222. In this embodiment, the main body plate 222 has a rectangular strip shape, and the plurality of LED lamps 224 are protruded on the main body plate 222 in a line and equidistantly spaced intervals. Each LED light 224 has a light emitting surface 225.

The member 23 has a heat insulating function and has a reflective effect on its surface, can be made of a material having heat insulating and reflective effects, or can be coated with a coating having heat insulating and reflective effects on the substrate. The member 23 includes a bottom wall 231, a mating wall 232 and a support wall 233 projecting from the bottom wall 231. The mating wall 232 is parallel to the support wall 233 and the mating wall 232 is raised above the support wall 233. The mating wall 232 is disposed on a side adjacent to the bottom wall 231 and forms an end edge 234 with the side 234 for carrying the light bar 22. A plurality of matching holes 235 corresponding to the number of the LED lamps 224 are defined in the matching wall 232. The plurality of matching holes 235 are equidistantly spaced apart from each other and each of the matching holes 235 extends through the two sides of the matching wall 232. The plurality of mating holes 235 are for correspondingly arranging the LED lamps 224 on the light bar 22. The shape of the matching hole 235 corresponds to the outer contour of the LED lamp 224. In this embodiment, the matching hole 235 has a rectangular through hole. The support wall 233 is protruded from a side of the bottom wall 231 opposite the edge 234 for supporting the light guide plate 24.

The light guide plate 24 acts as a light guiding light, and has a light incident surface 242 for matching the light emitting surface 225 of the LED lamp 224 for light to enter. In this embodiment, the light guide plate 24 has a rectangular block shape.

Referring to FIG. 3, FIG. 4, FIG. 5, when the backlight module 20 is assembled, the light bar 22 is mounted on the edge 233 of the member 23, and each LED lamp 224 on the light bar 22 is correspondingly sleeved. The LED lamp 224 does not protrude from the mating hole 235, and the light emitting surface of the LED lamp 224 is adjacent to the other side of the mating wall 232. The member 23 is mounted on the bottom plate 212 of the aluminum extrusion 21, and the light bar 22 is disposed between the mating wall 232 and the side plate 214. The side of the opposite LED lamp 224 of the light bar 22 abuts against the side plate 214 of the aluminum extrusion 21. After the light guide plate 24 is installed, the support wall 233 supports the light guide plate 24, and the light incident surface of the light guide plate 24 The side surface of the 242 that is attached to the mating wall 232 is adjacent to the light emitting surface 225 of the LED lamp 224.

When the LED lamp 224 emits light, the member 23 can replace the plastic frame in the conventional backlight structure and the reflective sheet on the aluminum extruded surface due to the reflected light of the member 23; and the light incident surface 242 of the light guide plate 24 Directly attached to the side of the member 23, the gap between the light guide plate 24 and the light emitting surface 225 of the LED lamp 224 can be reduced infinitely to improve the utilization of light; and since the member 23 is thermally insulated, the member 23 The light guide plate 24 can be directly carried, and the heat conduction of the aluminum extrusion 21 to the light guide plate 24 can be insulated to cause the light guide plate 24 to expand, and the rubber body that does not need to be extruded on the aluminum supports the light guide plate.

Referring to FIG. 6, FIG. 7, and FIG. 8, a second embodiment of the present invention provides a backlight module 30. The backlight module 30 has substantially the same structure as the backlight module 20 of the first preferred embodiment. The backlight module 30 includes the aluminum extrusion 21, the light bar 22, the member 33, and the light guide plate 24. The member 33 is substantially identical in structure to the member 23. The member 33 includes the bottom wall 231, a mating wall 232 protruding from the bottom wall 231, and a supporting wall 233. The mating wall 232 is parallel to the supporting wall 233 and the mating wall 232 is high. The support wall 233 is out. The mating wall 232 is disposed on a side adjacent to the bottom wall 231 and forms an end edge 234 with the side. The member 33 differs from the member 23 of the first preferred embodiment in that: the top of one side of the mating wall 232 of the member 33 of the second preferred embodiment is formed with a top edge 332, the top edge 332 and the end The edges 234 are on the same side and are parallel to each other. The bottom wall 231 of the member 23 is provided with a mounting hole 239 which is fixedly fitted to the bottom plate 212, as shown in FIG. The top edge 332 is used to align the top surface of the side panel 214 with the top edge 3324 after the light bar 22 is assembled, and simultaneously abut the top surface of the light bar 22 to secure the light bar 22 in the vertical direction. Thus, the light bar 22 does not require an additional fixing structure, such as locking the light bar 22 to the aluminum extrusion 21 using a locking screw or bonding to the aluminum extrusion 21 with a tape.

In summary, the components in the backlight module of the present invention have the function of reflecting light, so as to replace the plastic frame in the conventional backlight structure and the reflective sheet extruded on the aluminum; and the light incident surface of the light guide plate directly faces the member, and can be infinitely Smallly reduce the gap between the light guide plate and the light emitting surface of the LED lamp to improve the utilization of light; in addition, the member is insulated, the member directly carries the light guide plate, and can insulate the heat conduction of the aluminum extrusion to the light guide plate to cause the light guide plate to expand. , the rubber body does not need to be supported on the aluminum to support the light guide plate. It can be understood that the support wall 233 can be omitted, and the light guide plate 24 is directly mounted on the bottom wall 231 of the member 23.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the specification and the drawings of the present invention may be directly or indirectly applied to other related technologies. The scope of the invention is included in the scope of patent protection of the present invention.

Claims

Rights request

A backlight module, comprising: an aluminum extrusion, a light bar, a light guide plate, and a member; the light bar is provided with a plurality of LED lights, the member has a function of reflecting light, and the member is opened for receiving a matching hole of the LED lamp, the member is disposed on the aluminum, the light bar is carried on the component and is attached to one side of the component, and the LED lamp is correspondingly sleeved into the matching hole, the light guide plate On the other side of the light incident surface bonding member, the light emitting surface of the plurality of LED lamps is adjacent to the human light surface of the light guide plate.

2. The backlight module as claimed in claim 1, wherein the light guide plate is carried on the member, and the position at which the member contacts the light guide plate is made of a heat insulating material.

3. The backlight module as claimed in claim 1, wherein a plurality of matching holes are formed in the member, and the number thereof is corresponding to the number of LED lamps on the light bar.

4. The backlight module as claimed in claim 1, wherein the member comprises a bottom wall and a matching wall protruding from the bottom wall, and the plurality of matching holes are formed in the mating wall.

5. The backlight module as claimed in claim 4, wherein the plurality of matching holes are equidistantly spaced apart from each other and each of the matching holes penetrates both sides of the matching wall.

6. The backlight module as claimed in claim 4, wherein the member comprises a support wall protruding from the bottom wall, the mating wall is parallel to the support wall and the mating wall is higher than the support wall, and the support wall supports the guide Light board.

7. The backlight module as claimed in claim 4, wherein the mating wall is disposed on a side adjacent to the bottom wall and forms an end edge with the bottom wall on the side, the end edge carrying the light bar.

The backlight module of claim 1 , wherein the light bar comprises a main body plate and the plurality of LED lights disposed on the main body plate, wherein the plurality of LED lights are protruded at a line and equidistantly spaced On the main board.

9. The backlight module as claimed in claim 4, wherein the aluminum extrusion comprises a bottom plate and a side plate vertically connected to the bottom plate, the bottom plate carrying the member, the light bar being disposed between the mating wall and the side plate, The bottom wall of the member is provided with a mounting hole that is fixed to the bottom plate.

The backlight module of claim 4, wherein a light incident surface of the light guide plate is attached to a side surface of the mating wall and adjacent to a light emitting surface of the LED lamp, and an inner wall of the matching hole has a light reflecting effect. The light emitted by the LED lamp is reflected and enters the light guide plate.

11. The backlight module of claim 7, wherein a top of one side of the mating wall is formed with a top edge that is flush with the end edges and parallel to each other.

12. The backlight module of claim 1, wherein the member is made of a material having a reflective effect, or is coated on the substrate with a coating having a reflective effect.

A liquid crystal display device comprising the backlight module of claim 1, wherein the backlight module comprises an aluminum extrusion, a light bar, a light guide plate, and a member; the light bar is provided with a plurality of LEDs a lamp having a function of reflecting light, the member being provided with a fitting hole for accommodating the LED lamp, the member being disposed on the aluminum, the light bar being carried on the member and attached to one side of the member And the LED lamp is correspondingly disposed in the matching hole, and the other side of the light-incident surface of the light guide plate is attached to the light-emitting surface of the light guide plate, and the light-emitting surface of the LED light is adjacent to the light-incident surface of the light guide plate.

14. The liquid crystal display device according to claim 13, wherein the light guide plate is carried on a member, and a position at which the member is in contact with the light guide plate is made of a heat insulating material.

15. The liquid crystal display device according to claim 13, wherein a plurality of matching holes are formed in the member, the number of which corresponds to the number of LED lamps on the light bar.

16. The liquid crystal display device as claimed in claim 13, wherein the member comprises a bottom wall and a matching wall protruding from the bottom wall, and the plurality of matching holes are formed in the mating wall.

17. The liquid crystal display device according to claim 16, wherein the plurality of matching holes are formed at equal intervals in a line and each of the fitting holes penetrates both sides of the mating wall.

18. The liquid crystal display device according to claim 16, wherein the member comprises a support wall protruding from the bottom wall, the mating wall is parallel to the support wall and the mating wall is higher than the support wall, and the support wall supports the guide Light board.

19. The liquid crystal display device of claim 16, wherein: the mating wall is provided Located on a side adjacent to the bottom wall and forming an end edge with the bottom wall on the side, the end edge carries the light bar.

20. The liquid crystal display device according to claim 13, wherein: the light bar comprises a main body plate and the plurality of LED lights disposed on the main body plate, wherein the plurality of LED lights are lined and equally spaced Protruding on the main body board.

The liquid crystal display device according to claim 16, wherein: the aluminum extrusion comprises a bottom plate and a side plate vertically connected to the bottom plate, the bottom plate carries the member, and the light bar is disposed on the mating wall and the side plate Between the bottom wall of the member is provided with a mounting hole that is fixedly coupled to the bottom plate.

The liquid crystal display device according to claim 16, wherein a light incident surface of the light guide plate is attached to a side surface of the mating wall and adjacent to a light emitting surface of the LED lamp, and an inner wall of the matching hole has The light reflects the light emitted by the LED lamp and enters the light guide plate.

The liquid crystal display device according to claim 19, wherein a top portion of one side of the mating wall is formed with a top edge which is flush with the end edges and is parallel to each other.

The liquid crystal display device according to claim 13, wherein the member is made of a material having a light-reflecting effect, or is coated on the substrate with a coating having a light-reflecting effect.