CN203615136U - Backlight module and liquid crystal display device - Google Patents

Abstract

The utility model provides a backlight module and a liquid crystal display device, belonging to the technical field of liquid crystal display, which can solve the hotspot problem caused by uneven light diffusion of the existing backlight module. The backlight module of the present utility model includes: a light guide plate and an LED light bar, wherein the light incident side of the light guide plate is provided with a plurality of protrusions facing the LED light bar, and on the light incident side of the light guide plate A first diffusion layer is arranged on the top, and the first diffusion layer is attached to the protrusion, and is used to evenly disperse the light from the LED light bar.

Description

Backlight module and liquid crystal display device

technical field

The utility model belongs to the technical field of liquid crystal display, in particular to a backlight module and a liquid crystal display device.

Background technique

As shown in FIG. 1 , a backlight module generally used for a liquid crystal display includes: a light guide plate 1 , an LED (light emitting diode) light bar 2 , and a light guide plate 1 . Wherein, the first side of the light guide plate 1 is provided with a reflective sheet 3, and the second side opposite to the first side is provided with a plurality of optical films composed of a diffusion sheet 4, a prism sheet 5, etc., and then these light guide plate 1 components The periphery of the light guide plate is surrounded by an outer frame, and the side of the light guide plate 1 is provided with LED light strips 2 (commonly known as side-entry type). The rays are emitted through the diffusion sheet 4 and the prism sheet 5 in sequence, and the diffusion sheet can evenly diffuse the transmitted light and increase the luminous angle.

The inventors have found that there are at least the following problems in the prior art: the above-mentioned side-type backlight module, the light guide plate 1 cannot disperse the light from the LED light bar 2 well, and the light diffusion is still not very uniform. At this time, the light from the LED light The incident direction of the light emitted by strip 2 is relatively single. If there is no light at the edge of the light guide plate 1, a hotspot (hotspot is also called the firefly effect, which means that due to the distance between the LED lights of the LED light strip, there will be When the incident light of the LED lamp enters the light guide plate 1, there is a problem of uneven brightness at some positions close to the light incident side of the light guide plate 1).

Utility model content

The technical problem to be solved by the utility model includes, aiming at the above-mentioned problems existing in the existing backlight module, providing a backlight module and a liquid crystal display device which can disperse light evenly and solve the problem of hotspot.

The technical solution adopted to solve the technical problem of the utility model is a backlight module, which includes: a light guide plate and an LED light bar. The light incident side of the light guide plate is provided with a plurality of protrusions facing the LED light bar, and a first diffusion layer is provided on the light incident side, and the first diffusion layer is attached to the protrusions combined to evenly disperse the light from the LED strip.

The light incident surface of the light guide plate in the backlight module of the utility model is a raised structure, because the raised structure can disperse the light emitted from the LED light bar, and the first diffusion layer is arranged on the raised structure, The first diffusion layer is composed of diffusion particles, which are sprayed on the convex structure of the light guide plate to form diffusion points, that is, the first diffusion layer, which can further disperse the light emitted from the LED light bar, so that the light incident side of the light guide plate The light dispersion is more uniform, so as to achieve the effect of solving the hotspot phenomenon.

Preferably, the plurality of protrusions are arranged in a zigzag shape.

Preferably, the apex angle of the sawtooth is between 60° and 120°.

Preferably, the LED light bar includes: a substrate and LED lamps disposed on the substrate, and a second diffusion layer is disposed on the first diffusion layer at a position corresponding to at least the LED lamp.

Preferably, the backlight module further includes a reflective sheet, and the emitting sheet is arranged below the side away from the light-emitting surface of the light guide plate.

Preferably, the backlight module further includes a multi-layer optical film, and the optical film is disposed on the light-emitting surface of the light guide plate.

Preferably, the backlight module is a side-type or a direct-type.

The technical solution adopted to solve the technical problem of the utility model is a liquid crystal display device, which includes the above-mentioned backlight module.

Since the liquid crystal display device of the present invention includes the above-mentioned backlight module, the display effect is better and the applicability is stronger.

Description of drawings

FIG. 1 is a schematic structural view of an existing backlight module;

FIG. 2 is a schematic diagram of the backlight module of Embodiment 1 of the present invention.

The reference signs are: 1. light guide plate; 11. first diffusion layer; 12. second diffusion layer; 2. LED light bar; 3. reflection sheet; 4. diffusion sheet; 5. prism sheet.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

As shown in FIG. 2 , this embodiment provides a backlight module, which includes a light guide plate 1 and an LED light bar 2 . Wherein, the light incident side of the light guide plate 1 is provided with a plurality of protrusions facing the LED light bar 2, and a first diffusion layer 11 is provided on the light incident side of the light guide plate 1, and the first The diffusion layer 11 is attached to the protrusions, and is used to evenly disperse the light from the LED light bar 2 .

Since the light incident surface of the light guide plate 1 in the backlight module of this embodiment is a raised structure, the raised structure can disperse the light emitted from the LED light bar 2, and the raised structure is provided with The first diffusion layer 11, the first diffusion layer 11 is composed of diffusion particles, sprayed on the convex structure of the light guide plate 1 to form the first diffusion layer 11, which can further disperse the light emitted from the LED light bar 2, The light distribution on the light-incident side of the light guide plate 1 is more uniform, and the protrusions cover the entire light-incident side of the light guide plate 1 , so that the light emitted by the LED light bar can reach the edge of the light guide plate 1 .

Wherein, the convex structure on the light-incident surface of the above-mentioned light guide plate 1 is a zigzag shape, and its apex angle is between 60° and 120°. Of course, it is not limited to this range. angle. It should be noted that the convex structure on the light incident surface of the light guide plate 1 is not limited to a zigzag shape, and may also be other convex shapes such as trapezoid.

Wherein the LED light bar 2 includes: a base plate and an LED light arranged on the base plate, since the light incident place of the light guide plate corresponding to the LED light place is a place where the light is more concentrated, so in order to further make the light emitted from the LED light bar 2 The light irradiated on the light guide plate 1 is dispersed more evenly, and preferably, the second diffusion layer 12 is provided on the first diffusion layer 11 at least at a position corresponding to the LED lamp. Wherein, the second diffusion layer 12 is also composed of diffusion particles, sprayed on the first diffusion layer 11, can disperse the light emitted from the LED light bar 2 more uniformly, and achieve the effect of solving the hotspot phenomenon.

Preferably, the backlight module provided in this embodiment further includes a reflective sheet (not shown in the figure), and the reflective sheet is disposed below the side away from the light-emitting surface of the light guide plate 1 . The reflection sheet can reflect the dispersed light of the LED light bar out of the light guide plate, thereby improving the light utilization rate of the LED light bar.

Preferably, the backlight module provided in this embodiment further includes a multi-layer optical film (not shown in the figure), and the optical film is arranged on the light-emitting surface of the light guide plate 1 . Among them, the optical film is a diffusion film, a prism film, and the like. Of course, the backlight module may also include backlight module components such as a plastic frame and a front frame, which are similar to conventional backlight module components, and will not be described here.

Preferably, the backlight module provided by this embodiment can be a side-type or a direct-type. Those skilled in the art can understand that the side-type backlight module refers to the LED light bar 2 arranged at the side relative to the light-emitting side of the light guide plate 1, and the direct-type backlight module refers to the LED light bar 2 It is arranged on the side away from the light-emitting side of the light guide plate 1 .

The light guide plate 1 of the backlight module provided in this embodiment can evenly disperse the light emitted by the LED light bar 2, thereby solving the technical problem of hotspot.

Example 2:

This embodiment provides a liquid crystal display device, which includes the backlight module described in Embodiment 1. The liquid crystal display device can be any product or component with a display function such as a mobile phone, a tablet computer, a television set, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.

Since the liquid crystal display device of this embodiment includes the backlight module in Embodiment 1, its display effect is better and its applicability is stronger.

Certainly, the liquid crystal display device also includes other conventional structures such as a liquid crystal panel, such as a power supply unit, a display driving unit, and the like.

It can be understood that, the above embodiments are only exemplary embodiments adopted to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present utility model, and these variations and improvements are also regarded as the protection scope of the present utility model.

Claims (8)

1. a backlight module, it comprises: LGP, LED lamp bar, it is characterized in that, the light inlet side of described LGP is provided with the multiple projections towards described LED lamp bar, and be provided with the first diffusion layer in the light inlet side of described LGP, described the first diffusion layer and described projection fit, for by dispersed from the light of LED lamp bar.

2. backlight module according to claim 1, is characterized in that, multiple described bump array toothing.

3. backlight module according to claim 2, is characterized in that, the angle of the drift angle of described sawtooth is between 60～120 degree.

4. backlight module according to claim 1, is characterized in that, described LED lamp bar comprises: substrate and be arranged on the LED lamp on substrate, and at least corresponding with LED lamp position, be provided with the second diffusion layer on described the first diffusion layer.

5. backlight module according to claim 1, is characterized in that, described backlight module also comprises reflector plate, and described sheet emitting is arranged at the below that deviates from described LGP exiting surface side.

6. backlight module according to claim 1, is characterized in that, described backlight module also comprises multi-layer optical membrane, and described blooming piece is arranged on the exiting surface of described LGP.

7. backlight module according to claim 1, is characterized in that, described backlight module is side entering type or straight-down negative.

8. a liquid crystal indicator, is characterized in that, it comprises the backlight module as described in claim 1～7 any one.

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