CN201149633Y - Backlight module and liquid crystal display device - Google Patents

Abstract

The utility model discloses a backlight module, including a first frame, a light guide plate and an at least light source. The first frame comprises a bottom plate and a plurality of side walls connected with the bottom plate, wherein at least one side wall is provided with a positioning piece extending from the side wall to the inside of the first frame, and the bottom plate is provided with no broken hole at the position where the positioning piece is correspondingly arranged. The light guide plate is arranged above the bottom plate, wherein one side of the light guide plate is provided with a first alignment piece, and the first alignment piece is mutually clamped with the positioning piece on the first frame. The light source is arranged on one side of the light guide plate. The backlight module can prevent light leakage from the bottom plate, thereby providing uniform surface light source.

Description

Backlight module and liquid crystal display device

technical field

The utility model relates to a backlight module and a liquid crystal display device, in particular to a backlight module capable of preventing light leakage from a bottom plate and a liquid crystal display device using the backlight module.

Background technique

A liquid crystal display device is composed of a liquid crystal display panel and a backlight module, wherein the backlight module is mainly assembled from a bottom frame, a light source, a light guide plate, a plurality of optical films, and an upper frame.

FIG. 1 is a three-dimensional schematic diagram of a conventional backlight module. Referring to FIG. 1 , the backlight module 100 includes a bottom frame 110 , a light source 120 , a light guide plate 130 , a plurality of optical films 140 , a reflection sheet 150 and an upper frame 160 . In order to enhance the strength and rigidity of the overall backlight module 100 and improve the effect of heat dissipation, generally speaking, the bottom frame 110 is usually made of metal.

FIG. 2 is a partially enlarged schematic view of the bottom frame of FIG. 1 . FIG. 3 is a schematic diagram of positioning the light guide plate by using the bottom frame. Please refer to FIG. 2 first, the bottom frame 110 includes a bottom plate 112 , a plurality of side walls 114 and a positioning member 116 . The above-mentioned positioning member 116 is formed by making a hole 112 a on the bottom plate 112 at the middle portion of the left and right sides of the bottom frame 110 , and bending the bottom plate 112 at the hole 112 a upward.

Referring to FIG. 3 again, a plurality of positioning slots 134 are provided on the light guide plate 130 corresponding to the positioning members 116 , so that the positioning members 116 are inserted into the positioning slots 134 , that is, the light guide plate 130 can be positioned on the bottom frame 110 . Next, the light source 120, the optical film 140, the upper frame 150 and the like can be assembled.

FIG. 4 is a schematic diagram of a light leakage phenomenon occurring in a conventional backlight module. Please refer to FIGS. 1 to 4 together. Although the positioning piece 116 and the positioning slot 134 can effectively prevent the light guide plate 130 from moving in the plane direction of the bottom frame 110, however, since the base plate 112 has a hole 112a, the This will cause light leakage on the back of the backlight module 100 . As a result, the backlight module 100 cannot provide a uniform surface light source. In addition, in order to improve the above-mentioned problems caused by light leakage, it is also proposed to use a light-proof adhesive tape 170 to attach the perforated hole 112a to block the light leakage. However, this will increase additional production cost and time.

Utility model content

In view of this, the purpose of the present invention is to provide a backlight module, which can prevent light leakage from the hole in the bottom plate, provide a uniform surface light source, and reduce production cost and time.

Another object of the present invention is to provide a liquid crystal display device, which can improve the display quality by using the above-mentioned backlight module.

The utility model provides a backlight module, which includes a first frame, a light guide plate and at least one light source. The first frame includes a bottom plate and a plurality of side walls connected to the bottom plate, wherein at least one side wall has a positioning piece extending from the side wall to the inside of the first frame, and the bottom plate is correspondingly provided with a positioning piece without holes. The light guide plate is disposed above the base plate, wherein a first alignment member is provided on one side of the light guide plate, and the first alignment member engages with the positioning member on the first frame. The light source is arranged on one side of the light guide plate.

In the backlight module of the present invention, the above-mentioned positioning member includes a connecting portion, a positioning portion and an extending portion. The connection part is connected with the side wall. The positioning part is vertically connected to the connecting part. The extension part is vertically connected to the positioning part and parallel to the connection part.

In the backlight module of the present invention, the positioning member includes a connecting portion, a positioning portion and a side portion. The connection part is connected with the side wall. The positioning part is vertically connected to the connecting part. The side parts are vertically connected to the two sides of the positioning part and perpendicular to the connecting part.

In the backlight module of the present invention, the above-mentioned positioning member further includes a diaphragm positioning structure, which is arranged on the positioning portion and protrudes from the positioning portion.

In the backlight module of the present invention, it also includes at least one optical film, which is arranged on the light guide plate. At least one edge of the optical film has a second alignment member, and the second alignment member will be positioned with the film. The structures snap together to each other.

In the backlight module of the present invention, the above-mentioned optical film includes a diffusion film, an enhancement film, a prism film or a combination thereof.

In the backlight module of the present invention, the above-mentioned first alignment member includes a groove.

In the backlight module of the present invention, the above-mentioned first alignment member on the light guide plate includes at least two lugs, which protrude outward from the side of the light guide plate.

In the backlight module of the present invention, a second frame is also included on the first frame.

In the backlight module of the present invention, the above-mentioned light sources include cold-cathode fluorescent tubes or light-emitting diode arrays.

In the backlight module of the present invention, a reflection sheet is also included, which is arranged between the light guide plate and the first frame.

At least one side wall of the first frame of the present utility model has a positioning piece, and the positioning piece extends from the side wall to the inside of the first frame, and the bottom plate has no holes at the corresponding position of the positioning piece. Therefore, the backlight module can be well positioned for the light guide plate, and since the bottom plate does not have a hole, it can prevent light leakage from the hole. Therefore, the backlight module of the present invention can provide a uniform surface light source.

Description of drawings

In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model will be described in detail below in conjunction with the accompanying drawings, wherein:

FIG. 1 is a three-dimensional schematic diagram of a conventional backlight module.

FIG. 2 is a partially enlarged schematic view of the bottom frame of FIG. 1 .

FIG. 3 is a schematic diagram of positioning the light guide plate by using the bottom frame.

FIG. 4 is a schematic diagram of a light leakage phenomenon occurring in a conventional backlight module.

FIG. 5 is a three-dimensional schematic diagram of a backlight module according to a preferred embodiment of the present invention.

Fig. 6 is a partially enlarged schematic view of a positioning member in a preferred embodiment of the present invention.

FIG. 7A and FIG. 7B are schematic diagrams of respectively positioning two kinds of light guide plates by using the first frame.

FIG. 8 is a partially enlarged schematic diagram of a backlight module in a preferred embodiment of the present invention.

Fig. 9 is a schematic perspective view of another first frame with a positioning member according to a preferred embodiment of the present invention.

Fig. 10 is a partially enlarged schematic view of another first frame in a preferred embodiment of the present invention.

FIG. 11 is a schematic diagram of a liquid crystal display device according to a preferred embodiment of the present invention.

Description of main component symbols:

100: Backlight module

110: bottom frame

112: bottom plate

112a: Perforation

114: side wall

116: positioning piece

120: light source

130: light guide plate

134: positioning card slot

140: Optical film

150: reflector

160: upper frame

170: Opaque tape

200: Backlight module

210: First frame

212: bottom plate

214: side wall

220, 220a, 220b: positioning parts

222a, 222b: connection part

224a, 224b: positioning unit

226a: extension

226b: side part

230: light guide plate

232: The first alignment piece

232a, 232c: grooves

232b: Lugs

240: light source

250: Optical film

252: Second alignment piece

250a: Diffuser

250b: Enhancement film

250c: Prism sheet

260: reflector

270: Second frame

280: Diaphragm positioning structure

300: liquid crystal display device

310: Backlight module

320: Liquid crystal display panel

Detailed ways

FIG. 5 is a three-dimensional schematic diagram of a backlight module according to a preferred embodiment of the present invention. Referring to FIG. 5 , the backlight module 200 includes a first frame 210 , a light guide plate 230 and at least one light source 240 (two are shown in the figure). The first frame 210 includes a bottom plate 212 and a plurality of side walls 214 connected to the bottom plate 212, wherein at least one side wall 214 has a positioning member 220 extending from the side wall 214 to the inside of the first frame 210, and the bottom plate 212 There is no perforation at the position correspondingly provided with the positioning member 220 . The light guide plate 230 is disposed above the base plate 212 , wherein one side of the light guide plate 230 has a first aligning member 232 , and the first aligning member 232 engages with the positioning member 220 on the first frame 210 . The light source 240 is disposed on one side of the light guide plate 230 .

The bottom plate 212 of the backlight module 200 has no holes at the positions corresponding to the positioning members 220 . The following will continue to describe multiple embodiments of the positioning members 220 .

Fig. 6 is a partially enlarged schematic view of a positioning member in a preferred embodiment of the present invention. Please refer to FIG. 6 first. In this embodiment, the positioning member 220a includes a connecting portion 222a, a positioning portion 224a and an extending portion 226a. The connecting portion 222a is connected to the side wall 214 . The positioning portion 224a is vertically connected to the connecting portion 222a. The extending portion 226a is vertically connected to the positioning portion 224a and parallel to the connecting portion 222a. The positioning member 220a is a U-shaped structure composed of a connecting portion 222a, a positioning portion 224a and an extending portion 226a.

FIG. 7A and FIG. 7B are schematic diagrams of respectively positioning two kinds of light guide plates by using the first frame. Please refer to FIG. 6 and FIG. 7A together, the positioning member 220 a is disposed on the left and right sides of the first frame 210 . In particular, the first alignment member 232 of the light guide plate 230 as shown in FIG. 7A can be a groove 232a, which is recessed from one side of the light guide plate 230 to the inside thereof, and the groove 232a can be used to align with the positioning member. 220a is engaged.

In another embodiment, the first alignment member 232 on the light guide plate 230 as shown in FIG. The groove 232c formed between the two lugs 232b can be used to engage with the positioning member 220a.

FIG. 8 is a partially enlarged schematic diagram of a backlight module in a preferred embodiment of the present invention. Referring to FIG. 8 , the positioning member 220a can prevent the light guide plate 230 from moving in the plane direction. In particular, the positioning part 220 a extends from the side wall 214 to the inside of the first frame 210 , and the bottom plate 214 has no holes where the positioning part 220 is correspondingly disposed, so that the backlight module 200 does not generate light leakage. That is to say, the backlight module 200 can provide a uniform surface light source. In addition, compared with the conventional backlight module 100 , since the base plate 212 does not have holes, it is not necessary to attach an opaque tape, thereby reducing the manufacturing cost and time of the backlight module 200 .

The spirit of the present invention is that the positioning member 220 a extends from the side wall 214 to the inside of the first frame 210 , and the bottom plate 214 has no holes at the positions corresponding to the positioning member 220 . However, the present invention does not limit the shape of the positioning member 220a, that is, the positioning member 220a is not limited to the above-mentioned ㄇ-shaped structure.

Fig. 9 is a schematic perspective view of another first frame with a positioning member according to a preferred embodiment of the present invention. Referring to FIG. 9 , in this embodiment, the positioning member 220b includes a connecting portion 222b, a positioning portion 224b and a side portion 226b. The connecting portion 222b is connected to the side wall 214 . The positioning portion 224b is vertically connected to the connecting portion 222b. The side portion 226b is vertically connected to two sides of the positioning portion 224b and is perpendicular to the connecting portion 222b. Similarly, it is enough that the formed positioning part 220b can match the first alignment part 232 of the light guide plate 230, such as the groove 232a shown in FIG. 7A or the two lugs 232b and the gap between them as shown in FIG. The groove 232c.

Fig. 10 is a partially enlarged schematic view of another first frame in a preferred embodiment of the present invention. Please refer to FIG. 5 and FIG. 10 together, the above positioning member 220a further includes a diaphragm positioning structure 280 disposed on the positioning portion 224a and protruding from the positioning portion 224a. The film positioning structure 280 is used for positioning the optical film 250 . That is to say, the backlight module 200 may further include at least one optical film 250 disposed on the light guide plate 230, at least one edge of the optical film 250 has a second alignment member 252, and the second alignment member 252 will snap together with the diaphragm positioning structure 280 . Similarly, the design of the second alignment member 252 can be similar to that of the first alignment member 232, being formed as a groove, or as two lugs and a groove between them, which will not be repeated here. .

In addition, the above-mentioned optical film 250 includes a diffusion sheet 250a, a brightness enhancement sheet 250b, a prism sheet 250c or a combination thereof. The optical film shown in FIG. 5 is an embodiment in which the diffusion sheet 250a, the enhancement sheet 250b and the prism sheet 250c are selected at the same time, but the present invention is not limited to this embodiment.

As shown in FIG. 10 , by making a hole 290 in a partial position of the positioning member 220 a, a part of the positioning portion 224 a can be bent upward to form a film positioning structure 280 for positioning the optical film 250 . Certainly, the diaphragm positioning structure 280 may also be formed on the positioning member 220b as shown in FIG. 9 .

Referring to FIG. 5 again, the backlight module 200 may further include a reflection sheet 260 disposed between the light guide plate 230 and the first frame 210 for uniformly reflecting the light provided by the light source 240 . In addition, the above-mentioned light source 240 may be a cold cathode fluorescent tube, a light emitting diode array or other suitable light sources, and may be arranged in a single-side incident light, double-side light incident or in a suitable manner. Moreover, the backlight module 200 may further include a second frame 270 disposed on the first frame 210 for fixing the light guide plate 230 and the light source 240 between the first frame 210 and the second frame 270 .

To sum up, the backlight module 200 can well form the positioning parts 220 , 220 a , 220 b for engaging with the first alignment part 232 of the light guide plate 230 without light leakage from the bottom plate 212 . In addition, a film positioning structure 280 may also be formed on the positioning members 220 , 220 a , 220 b to engage with the second alignment member 252 on the optical film 250 . In this way, the backlight module can provide a uniform surface light source.

FIG. 11 is a schematic diagram of a liquid crystal display device according to a preferred embodiment of the present invention. The liquid crystal display device 300 includes a backlight module 310 and a liquid crystal display panel 320 . The backlight module 310 can be the above-mentioned backlight module 200 , and the same or similar components are marked with the same reference numerals, and will not be repeated here. The liquid crystal display panel 320 is disposed above the backlight module 310 .

Please refer to FIG. 11 and FIG. 5 together. Since the backlight module 310 used is different from the existing design in the design of the positioning parts 220, 220a, 220b, there is no need to make holes on the bottom plate 212, so this backlight module 310 can A uniform surface light source is provided, thereby improving the display quality of the liquid crystal display device 300 .

In summary, the backlight module and liquid crystal display device of the present invention have at least the following advantages:

At least one side wall of the first frame includes a locating piece, especially, the locating piece extends from the side wall to the inside of the first frame, and the bottom plate has no holes where the locating piece is correspondingly arranged. Therefore, the backlight module can be well positioned on the light guide plate, and since the bottom plate does not have any holes, light leakage from the holes can be prevented, so that the backlight module can provide a uniform surface light source. In addition, the backlight module is easy to manufacture, which can reduce the manufacturing cost and time.

Although the utility model has been disclosed above with preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present utility model should be defined by the claims.

Claims (10)

1. A backlight module, characterized in that it comprises: A first frame includes a bottom plate and a plurality of side walls connected to the bottom plate, wherein at least one of the side walls has a positioning piece extending from the side wall to the inside of the first frame, and the bottom plate is correspondingly set Where there is this positioning piece, there is no hole; a light guide plate disposed above the base plate, wherein one side of the light guide plate has a first alignment member, and the first alignment member engages with the positioning member on the first frame; and At least one light source is arranged on one side of the light guide plate. 2. The backlight module according to claim 1, wherein the positioning member comprises: a connecting portion connected to the side wall; a positioning portion vertically connected to the connecting portion; and An extension part is vertically connected to the positioning part and parallel to the connecting part. 3. The backlight module according to claim 1, wherein the positioning member comprises: a connecting portion connected to the side wall; a positioning portion vertically connected to the connecting portion; and One side part is vertically connected to two sides of the positioning part and is perpendicular to the connecting part. 4. The backlight module according to claim 2 or 3, wherein the positioning member further comprises: A diaphragm positioning structure is arranged on the positioning part and protrudes from the positioning part. 5. The backlight module according to claim 4, further comprising: At least one optical film is arranged on the light guide plate, and at least one edge of the optical film has a second alignment member, and the second alignment member is engaged with the film positioning structure. 6. The backlight module according to claim 5, wherein the optical film comprises a diffusion film, a light enhancement film, a prism film or a combination thereof. 7. The backlight module as claimed in claim 1, wherein the first alignment member comprises a groove. 8. The backlight module as claimed in claim 1, wherein the first alignment member comprises at least two lugs protruding outward from the side of the light guide plate. 9. The backlight module according to claim 1, further comprising: A second frame is set on the first frame. 10. The backlight module as claimed in claim 1, wherein the light source comprises a CCFL or a LED array.

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