CN106681053A - Backlight module and liquid crystal display device - Google Patents

Abstract

The invention provides a backlight module and a liquid crystal display device, and relates to the technical field of display. On the basis that the width of a backlight module frame is not increased, the problem that the optical diaphragm fixing mode of an existing backlight module easily causes shaking and warping of an optical diaphragm is solved. The backlight module includes the frame, an optical diaphragm, a light guide plate, a reflection sheet and a back plate. The longitudinal section of the frame is in an L shape and includes a first edge with the extending direction perpendicular to the optical diaphragm and a second edge with the extending direction parallel to the optical diaphragm, the inner side of the first edge and the inner surface of the second edge are each provided with a positioning part, the edge of the optical diaphragm is provided with positioning holes matched with the positioning parts, and the positioning parts pass through the positioning holes to fix the optical diaphragm. The backlight module is suitable for the liquid crystal display device with a narrow frame and can provide light required by image displaying for the liquid crystal display device.

Description

Backlight module and liquid crystal display device

technical field

The invention relates to the field of display technology, in particular to a backlight module and a liquid crystal display device.

Background technique

The backlight module is one of the important devices in the liquid crystal display device, mainly including light source, light guide plate, optical film, front frame and back plate and other components.

In the prior art, the optical film of the backlight module is usually fixed by double bending the back plate, setting a positioning column at the secondary bending part of the back plate, and setting a positioning hole at the edge of the optical film , the positioning column is inserted into the positioning hole, and then adhesive tape is pasted on the positioning hole of the optical diaphragm to realize the positioning of the optical diaphragm. This method of fixing the optical film requires secondary bending of the back plate, and sufficient space is reserved on the secondary bending part to set the positioning column, thereby increasing the width of the frame of the backlight module and making it impossible to achieve a narrow frame structural design.

For the narrow frame backlight module, the optical film is usually fixed by fixing the edge of the optical film in the area between the frame and the primary bending part of the backplane, and the edge of the optical film is clamped by the frame and the backplane, but this This kind of fixing method without a positioning structure, the optical diaphragm shakes and warps obviously during use, which greatly affects the installation and use effect of the optical diaphragm, and further affects the imaging quality of the backlight module.

Contents of the invention

The object of the present invention is to provide a backlight module and a liquid crystal display device, without increasing the width of the frame of the backlight module, it solves the problem that the optical film fixing method of the existing backlight module easily causes the optical film to shake and warp. warped problem.

In order to achieve the above object, the present invention provides the following technical solutions:

In a first aspect, the present invention provides a backlight module, which includes a frame, an optical film, a light guide plate, a reflection sheet and a back plate arranged in sequence, the longitudinal section of the frame is "L" shaped, including The extension direction is perpendicular to the first side of the optical film and the extension direction is parallel to the second side of the optical film, the inner side of the first side and the inner surface of the second side are provided with positioning parts, and the optical film A positioning hole matched with the positioning part is opened at the edge of the optical film, and the positioning part passes through the positioning hole to fix the optical film.

In the backlight module provided by the present invention, on the premise that the width of the existing frame remains unchanged, a positioning part is provided on the inner side of the first side of the frame and the inner surface of the second side, and a positioning part is provided and positioned at the edge of the optical film. The positioning hole is matched with the positioning part, and the positioning part is matched with the positioning hole to fix the optical diaphragm. Compared with the way of fixing the optical film on the back plate in the prior art, the solution of the present invention does not involve the secondary bending of the back plate, and does not need to reserve enough space on the back plate to set the positioning column. The process is simple, and it is suitable for the structural design of the narrow frame; compared with the narrow frame backlight module in the prior art, the optical film is fixed by clamping the edge of the optical film with the frame and the back plate, the present invention has special features for fixing The positioning structure of the optical film makes the fixing of the optical film more stable, avoids the shaking and warping of the optical film during use, improves the installation and use effect of the optical film, and improves the imaging of the backlight module quality.

In a second aspect, the present invention provides a liquid crystal display device, the liquid crystal display device comprising: a liquid crystal display, and a backlight module according to the first aspect superimposed on the back of the liquid crystal display.

The beneficial effects of the liquid crystal display device provided by the present invention are the same as those of the above-mentioned backlight module, and will not be repeated here.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic structural view of a backlight module according to Embodiment 1 of the present invention;

2 is a longitudinal sectional view of the frame of the backlight module according to Embodiment 1 of the present invention;

3 is a longitudinal sectional view of the optical film of the backlight module according to Embodiment 1 of the present invention;

Figure 4a is a schematic diagram of the distribution of positioning holes of the optical film in Figure 3;

Fig. 4b is a schematic diagram of the distribution of positioning holes of the optical film in Fig. 3 in another manner;

FIG. 5 is a schematic structural diagram of a backlight module involved in Embodiment 2 of the present invention;

FIG. 6 is a schematic structural view of the optical film with lugs in the backlight module according to the second embodiment of the present invention.

Reference signs:

1 - frame 101 - first side

102-second side 103-positioning part

2-optical diaphragm 201-positioning hole

202-upper diffusion sheet 203-prism sheet

204-lower diffuser 205-lug

3-Light guide plate 4-Reflector

5-back plate 501-primary bending part

detailed description

In order to make the purpose, features and advantages of the technical solution proposed by the present invention more obvious and understandable, the embodiments of the technical solution proposed by the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the proposed technical solution, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that the so-called "primary bending part" refers to the part formed by the first bending of both ends of the backboard toward the frame direction; the so-called "secondary bending part" refers to the end of the primary bending part of the backboard Bend the formed section further inward.

Embodiment one

Referring to FIG. 1 , Embodiment 1 of the present invention provides a backlight module, which includes a frame 1 , an optical film 2 , a light guide plate 3 , a reflection sheet 4 and a backplane 5 . The longitudinal section of the frame 1 is "L" shape, including a first side 101 extending in a direction perpendicular to the optical film and a second side 102 extending in a direction parallel to the optical film, the inside of the first side 101, the The inner surface of the second side 102 is provided with a positioning portion 103 , see FIG. 2 . The edge of the optical film 2 is provided with a positioning hole 201 matched with the positioning part 103, and the positioning part 103 passes through the positioning hole 201 to fix the optical film 2. Generally, the optical film The sheet 2 includes an upper diffusion sheet 202 , a prism sheet 203 and a lower diffusion sheet 204 arranged in sequence from the light exit surface away from the light guide plate 3 to close to the light exit surface of the light guide plate, see Fig. 3, 4a, 4b.

During assembly, in order to pass the positioning portion 103 through the positioning hole 201 more conveniently, preferably, the positioning portion 103 is columnar; further preferably, the cross section of the positioning portion 103 is circular or elliptical.

For a common backlight module, the cross-section of the frame 1 and the optical film 2 are rectangular, and in use, the warping and shaking of the optical film 2 are mainly due to the four corners of the rectangular optical film 2. Due to unstable fixation, preferably, the positioning parts 103 are located at the four corners of the frame 1, and the positioning parts 103 at the four corners of the frame 1 are matched with the positioning holes 201 at the four corners of the optical film 2, as shown in FIG. Effectively fix the optical film 2.

On the basis of effectively fixing the optical film 2, in order to enable the backlight module of the present invention to further fix the light guide plate 3 and at the same time reduce the problem of light leakage from the side of the light guide plate 3, preferably, the positioning part 103 is made of a non-transparent material, And integrally formed with the frame 1 , the light guide plate 3 is located inside the positioning portion 103 . The light guide plate 3 is arranged inside the positioning part 103, which can further limit the position of the light guide plate 3. At the same time, the positioning part 103 is made of non-transparent material, and the positioning part 103 can absorb the light emitted from the side part of the light guide plate 3 , to reduce the light leakage problem on the side of the light guide plate 3 .

Further, in order to enable the backlight module of the present invention to further limit the backplane 5, increase the stability of the overall structure of the backlight module, and further improve the imaging quality of the backlight module, preferably, the backlight 5 has a primary bending portion 501 bent toward the frame 1 , and the primary bending portion 501 is located between the first side 101 of the frame 1 and the positioning portion 103 .

Embodiment two

The structure of the backlight module provided by the second embodiment of the present invention is basically the same as that of the first embodiment, the difference between the two is that the shape of the optical film 2 is different, see FIGS. 5-6 .

The side of the optical film 2 of the second embodiment is provided with a lug 205 , and the lug 205 is provided with a positioning hole 201 matched with the positioning portion 103 .

The edge of the optical film 2 is provided with a positioning hole 201, and the edge of the positioning hole 201 will be warped due to processing, which will destroy the overall flatness of the optical film 2, and then affect the use effect of the optical film 2; The lug 205 is provided on the side of the lug 205, and the positioning hole 201 is set on the lug 205. The warping problem caused by processing is limited to the lug 205 area, which greatly ensures the overall flatness of the optical film 2.

Embodiment three

Embodiment 3 of the present invention provides a liquid crystal display device. The liquid crystal display device includes: a liquid crystal display and a backlight module superimposed on the back of the liquid crystal display. The structure of the backlight module is the same as that of the first or embodiment The structures of the backlight modules in the two are the same.

The liquid crystal display device provided by Embodiment 3 of the present invention applies the backlight module of Embodiment 1 or Embodiment 2. On the premise that the width of the existing frame remains unchanged, the fixing of the optical film is more stable, and the optical film is avoided. Shaking and warping during use improve the installation and use effect of the optical film, thereby improving the imaging quality of the backlight module.

It should be noted that the liquid crystal display device in this embodiment can be any product or component with a display function such as a liquid crystal panel, electronic paper, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, and a navigator.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. a kind of backlight module, the backlight module includes framework, blooming piece, light guide plate and backboard, the longitudinal section of the framework For " L " shape, including extend perpendicularly to the first of blooming piece while and bearing of trend parallel to blooming piece second while, its Be characterised by, described first while inner side, described second while inner surface be provided with location division, the edge of the blooming piece is opened The location hole being engaged with the location division is provided with, blooming piece is fixed in the location division through the location hole.

2. backlight module according to claim 1, it is characterised in that the location division is column.

3. backlight module according to claim 2, it is characterised in that the cross section of the location division is circular or oval Shape.

4. backlight module according to claim 1, it is characterised in that the cross section of the framework and the blooming piece are equal For rectangle, the position point is at the corner of the framework.

5. backlight module according to claim 1, it is characterised in that the side of the blooming piece is provided with lug, institute State and the location hole being engaged with the location division is offered on lug.

6. backlight module according to claim 1, it is characterised in that the blooming piece is included from going out away from light guide plate 3 Light face is to upper diffusion sheet, prismatic lens and the lower diffusion sheet being sequentially arranged near light guide plate exiting surface.

7. backlight module according to claim 1, it is characterised in that the location division is made using non-transparent material, with The framework is integrally formed, and the light guide plate is located at the inner side of the location division.

8. backlight module according to claim 1, it is characterised in that the backboard has to the bending frameworks once Kink, a bending part is between first side and the location division of the framework.

9. a kind of liquid crystal indicator, the liquid crystal indicator includes：LCDs, it is superimposed on the LCDs back of the body The backlight module as described in any one of claim 1-8 in face.