CN207249299U - A backlight module capable of effectively preventing light leakage and display device thereof - Google Patents

Abstract

The utility model relates to the technical field of backlight modules, and specifically to a backlight module and a display device that can effectively prevent light leakage, which includes a back frame, a backlight source arranged in the back frame, a light guide plate arranged on one side of the backlight source, a diffusion plate arranged on the light guide plate, and a light shielding film arranged around the outside of the backlight source; one end of the light shielding film is fixed to the upper part of the light guide plate, the other end of the light shielding film is fixed to the lower part of the light guide plate, and the middle part of the light shielding film is fixed to the back frame; the diffusion plate includes a light incident surface and a light emitting surface, and the light emitting surface of the diffusion plate is formed by splicing a plurality of semicircles arranged in sequence. Since the light shielding film is arranged around the outside of the backlight source, light leakage can be effectively prevented, thereby improving the utilization rate of light. In addition, since the light emitting surface of the diffusion plate is formed by splicing a plurality of semicircles arranged in sequence, the light can be diffracted at the light emitting surface after entering the diffusion plate and emitted from the diffusion plate, thereby reducing the loss of light energy and further improving the utilization rate of light.

Description

A backlight module capable of effectively preventing light leakage and display device thereof

technical field

The utility model relates to the technical field of backlight modules, in particular to a backlight module and a display device thereof which can effectively prevent light leakage.

Background technique

The structure of the liquid crystal display device includes a liquid crystal panel and a backlight module. The liquid crystal panel itself does not emit light, and needs the light source provided by the backlight module to display images normally. Therefore, the backlight module becomes one of the key components of the liquid crystal display device. According to different incidence modes of the light source, the backlight module can be divided into a direct-type backlight module and an edge-type backlight module. Among them, the side-type backlight module is to install the backlight LED strip on the edge of the back panel behind the liquid crystal panel. The light emitted by the LED strip enters the light guide plate from the light incident surface on one side of the light guide plate and is reflected and diffused. It emits from the light-emitting surface of the light guide plate, and then passes through the optical film group to form a surface light source and provide it to the liquid crystal panel.

In the backlight module in the prior art, the light source generally enters the diffusion plate through the light guide plate for scattering and diffusion. However, when the light source enters the light guide plate, light leakage is prone to occur, which leads to a low utilization rate of light. In addition, in the prior art, when the light emitted by the light source passes through the diffuser plate and exits from the light-emitting surface of the diffuser plate, since the light enters the air medium with a smaller refractive index from the diffuser plate with a larger refractive index, it enters the diffuser plate The final part of the light will be totally reflected at the light-emitting surface of the diffuser, so that this part of the light cannot exit the diffuser, and then the light transmittance of the diffuser will decrease, that is, the light utilization rate will be low.

Utility model content

In view of the above-mentioned technical problems in the prior art, one of the purposes of the present invention is to provide a backlight module that can effectively prevent light leakage, so as to improve the utilization rate of light.

In view of the above-mentioned technical problems in the prior art, the second purpose of the present utility model is to provide a display device.

In order to achieve one of the above objects, the utility model provides the following technical solutions:

Provided is a backlight module capable of effectively preventing light leakage, comprising a back frame, a back light source disposed in the back frame, a light guide plate disposed on one side of the back light source, and a diffusion plate disposed on the light guide plate , and a light-shielding film surrounding the outside of the backlight source;

One end of the light shielding film is fixed on the upper part of the light guide plate, the other end of the light shielding film is fixed on the lower part of the light guide plate, and the middle part of the light shielding film is fixed on the back frame;

The diffuser plate includes a light incident surface and a light output surface, and the light output surface of the diffuser plate is formed by splicing several semicircles arranged in sequence.

The radius of the semicircle is set to be 0.01mm-3mm.

The radius of the semicircle is set to 0.5mm.

The radius of the semicircle is set to 1mm.

The light-emitting surface formed by splicing several sequentially arranged semicircles is integral with the diffusion plate.

The diffusion plate is a diffusion plate made of PP plastic.

The diffusion plate is made of PET plastic.

The diffusion plate is a diffusion plate made of HDPE plastic.

In order to achieve the above-mentioned purpose two, the utility model provides the following technical solutions:

A display device is provided, which includes the above-mentioned backlight module capable of effectively preventing light leakage.

The beneficial effects of the utility model:

(1) A backlight module of the present utility model that can effectively prevent light leakage, including a back frame, a back light source arranged in the back frame, a light guide plate arranged on one side of the back light source, and a diffusion plate arranged on the light guide plate , and a light-shielding film arranged around the outside of the backlight source; one end of the light-shielding film is fixed on the upper part of the light guide plate, the other end of the light-shielding film is fixed on the lower part of the light guide plate, and the middle part of the light-shielding film is fixed on the back frame; the diffusion plate includes a light incident surface and the light-emitting surface, the light-emitting surface of the diffusion plate is formed by splicing several semicircles arranged in sequence. Since the light-shielding film is provided on the outer ring of the backlight source, light leakage can be effectively prevented, thereby improving the utilization rate of light. In addition, since the light-emitting surface of the diffusion plate is spliced by several semicircles arranged in sequence, the light can be diffracted at the light-emitting surface after entering the diffusion plate and exit the diffusion plate, thereby reducing the loss of light energy and further improving the light utilization.

(2) A backlight module of the utility model capable of effectively preventing light leakage has the characteristics of simple structure, low production cost, and suitable for large-scale production.

(3) A display device of the present invention includes a backlight module capable of effectively preventing light leakage according to the present invention, so that the display device can also effectively prevent light leakage.

Description of drawings

FIG. 1 is a structural schematic diagram of a backlight module capable of effectively preventing light leakage according to the present invention.

Reference signs:

back frame 1;

Backlight 2;

Light guide plate 3;

Diffusion plate 4, light incident surface 41, light exit surface 42, semicircle 401;

Shading film 5.

Detailed ways

The utility model is described in detail below in conjunction with specific embodiments and accompanying drawings.

Example 1.

A backlight module that can effectively prevent light leakage in this embodiment, as shown in FIG. The diffusion plate 4 arranged on the light guide plate 3, and the light shielding film 5 arranged around the outside of the backlight 2; one end of the light shielding film 5 is fixed on the upper part of the light guide plate 3, and the other end of the light shielding film 5 is fixed on the lower part of the light guide plate 3 , the middle part of the light-shielding film 5 is fixed on the back frame 1; the diffusion plate 4 includes a light incident surface 41 and a light exit surface 42, and the light exit surface 42 of the diffusion plate 4 is formed by splicing several semicircles 401 arranged in sequence. Since the light-shielding film 5 is arranged around the outer side of the backlight source 2, light leakage can be effectively prevented, thereby improving the utilization rate of light. In addition, since the light-emitting surface 42 of the diffuser 4 is spliced by several semicircles 401 arranged in sequence, light entering the diffuser 4 can be diffracted on the light-emitting surface 42 and exit the diffuser 4, thereby reducing light energy. The loss further improves the light utilization rate.

In this embodiment, the radius of the semicircle 401 is set to 0.5mm, and the light-emitting surface 42 formed by splicing the semicircles 401 of this radius can make the light enter the diffuser plate 4 and be diffracted at the light-emitting surface 42 to exit the diffuser plate 4, and then The loss of light energy is reduced, and the utilization rate of light is further improved.

In this embodiment, the light emitting surface 42 formed by splicing several semicircles 401 arranged in sequence and the diffuser plate 4 are of an integral structure, thereby reducing the loss of light energy and further improving the utilization rate of light.

In this embodiment, the diffusion plate 4 is a diffusion plate 4 made of PP plastic. The diffusion plate 4 made of PP plastic can facilitate the scattering and diffusion of light, thereby reducing the loss of light energy and further improving the utilization rate of light.

Example 2.

Embodiment 2 of a backlight module of the present utility model that can effectively prevent light leakage. The light emitting surface 42 formed by splicing can make the light enter the diffuser plate 4 and be diffracted at the light emitting surface 42 to exit the diffuser plate 4 , thereby reducing the loss of light energy and further improving the utilization rate of light. In this embodiment, the diffusion plate 4 is a diffusion plate 4 made of PET plastic. The diffusion plate 4 made of PET plastic can facilitate the scattering and diffusion of light, thereby reducing the loss of light energy and further improving the utilization rate of light. Other structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

Example 3.

Embodiment 3 of a backlight module of the present utility model that can effectively prevent light leakage. The light emitting surface 42 spliced by 401 can make the light enter the diffuser plate 4 and be diffracted at the light emitting surface 42 to exit the diffuser plate 4, thereby reducing the loss of light energy and further improving the utilization rate of light. In this embodiment, the diffusion plate 4 is a diffusion plate 4 made of HDPE plastic. The diffusion plate 4 made of HDPE plastic can facilitate the scattering and diffusion of light, thereby reducing the loss of light energy and further improving the utilization rate of light. Other structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

Example 4.

Embodiment 4 of a backlight module of the present utility model that can effectively prevent light leakage. The light emitting surface 42 formed by splicing can make the light enter the diffuser plate 4 and be diffracted at the light emitting surface 42 to exit the diffuser plate 4 , thereby reducing the loss of light energy and further improving the utilization rate of light. Other structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

Example 5.

A display device of the present invention comprises a backlight module capable of effectively preventing light leakage according to Embodiment 1, so that the display device can effectively prevent light leakage.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art Personnel should understand that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (9)

1. A backlight module capable of effectively preventing light leakage, characterized in that: it comprises a back frame, a back light source arranged in the back frame, a light guide plate arranged on one side of the back light source, a light guide plate arranged in the described back light source a diffusion plate on the light plate, and a light-shielding film surrounding the outside of the backlight; One end of the light shielding film is fixed on the upper part of the light guide plate, the other end of the light shielding film is fixed on the lower part of the light guide plate, and the middle part of the light shielding film is fixed on the back frame; The diffuser plate includes a light incident surface and a light output surface, and the light output surface of the diffuser plate is formed by splicing several semicircles arranged in sequence. 2 . The backlight module capable of effectively preventing light leakage according to claim 1 , wherein the radius of the semicircle is set to 0.01 mm˜3 mm. 3 . 3. A backlight module capable of effectively preventing light leakage according to claim 2, wherein the radius of the semicircle is set to 0.5 mm. 4. A backlight module capable of effectively preventing light leakage according to claim 2, wherein the radius of the semicircle is set to 1mm. 5 . The backlight module capable of effectively preventing light leakage according to claim 1 , wherein the light-emitting surface formed by splicing several sequentially arranged semicircles is integrated with the diffusion plate. 6 . 6 . The backlight module capable of effectively preventing light leakage according to claim 1 , wherein the diffusion plate is made of PP plastic. 7. A backlight module capable of effectively preventing light leakage according to claim 1, wherein the diffusion plate is made of PET plastic. 8. A backlight module capable of effectively preventing light leakage according to claim 1, wherein the diffusion plate is made of HDPE plastic. 9. A display device, characterized in that the display device comprises a backlight module capable of effectively preventing light leakage according to any one of claims 1 to 8.