CN203240403U - Backlight module and LCD (liquid crystal display) device - Google Patents

Abstract

The utility model discloses a backlight module and a liquid crystal display device. The backlight module comprises a backplane, a light source, a light guide plate arranged relative to the light source, an optical film group arranged above the light guide plate, and a The board is used to fix the plastic frame of the optical film group, and the side of the optical film group close to the light source is provided with a light shielding layer. The backlight module can reduce light leakage caused by light incident on the optical film group.

Description

Backlight module and liquid crystal display device

technical field

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

Background technique

At present, with the wide application of LED semiconductor technology and large-size liquid crystal display technology, the application of large-size ultra-narrow bezel edge-type backlight modules is becoming more and more extensive. The principle of the side-type backlight module is: the light emitted by the light source after power-on enters the light guide plate opposite to the light source, and is reflected by the reflective sheet set on the bottom of the light guide plate, so that the light emitted by the light source continues inside the light guide plate. Refraction and reflection occur, so that the light is evenly distributed on the surface of the backlight module, and then the line light source is converted into a uniform surface light source. In addition, the brightness and uniformity of the surface light source can be further improved through the arrangement of a diffusion sheet and other diaphragms above the light guide plate.

However, the existing edge-type backlight modules are prone to light leakage. As shown in FIG. 1 , most of the light emitted by the light source will be incident on the light guide plate, but a small part of the light will enter the optical film set through the end faces of the stacked optical film sets on the light guide plate. The thickness of the optical film set is small, which can be understood as a light guide plate with a very thin thickness. After the light enters the optical film set, it will still travel forward for a certain distance to form a bright line. When the width of the bright line is larger than the area covered by the plastic frame, that is, larger than the visible area on the liquid crystal display device, light leakage will occur, as shown in FIG. 1, A is the light leakage area of the backlight module. Bright lines will be produced in this area, affecting the visual effect of viewing.

In the backlight module industry, A/P is usually used to describe the risk of light leakage that may occur on the light incident side of the light source. Among them, A is the distance from the light-emitting surface of the LED to the visible area of the LCD panel, and P is the center-to-center distance between two adjacent LEDs. When the frame of the backlight module is relatively wide (when A/P≥0.9), such bright lines will not affect the display quality of the liquid crystal display device. However, in the ultra-narrow bezel edge-lit backlight module, due to the short light mixing distance (A/P≤0.9), the light incident on the optical film group can easily enter the display area of the liquid crystal glass, that is Form a light leakage phenomenon on the taste.

Utility model content

The main purpose of the utility model is to provide a backlight module and a liquid crystal display device, aiming at reducing the light leakage of the backlight module caused by the light guide of the optical film group.

In order to achieve the above purpose, the utility model proposes a backlight module, including a backplane, a light source, a light guide plate set relative to the light source, an optical film group set above the light guide plate, and a The plastic frame for fixing the optical film set is characterized in that a light-shielding layer is provided on the side of the optical film set close to the light source.

Preferably, the light-shielding layer is a coating, a plating layer, a sticking layer or a chemically generated layer.

Preferably, a plurality of optical films on the optical film group are stacked on a side close to the light source to form a slope, and an angle between the slope and the bottommost optical film is greater than 90 degrees.

Preferably, the light shielding layer is provided with a first reflective layer.

Preferably, a second reflective layer is provided on the surface of the plastic frame close to the light source.

Preferably, the first reflective layer and the second reflective layer are reflective sheets pasted on the light-shielding layer or reflective materials coated on the light-shielding layer.

The utility model further proposes a liquid crystal display device having the above-mentioned backlight module.

The utility model arranges a light-shielding layer on the side of the optical diaphragm group close to the light source, so that the light emitted by the light source will not be incident into the optical diaphragm, but will be absorbed by the light-shielding layer or blocked on the outside of the optical diaphragm group, thereby Reduce light leakage caused by light incident on the optical film group. The backlight module proposed by the utility model, regardless of the value of A/P, can fundamentally prevent the light leakage caused by the scattered light emitted by the light source entering the optical film group even when the light mixing distance is relatively short Phenomenon. In addition, the structure of the backlight module is simple, only a light-shielding layer needs to be provided on the optical film group, and the production process is simple and convenient.

Description of drawings

FIG. 1 is a schematic structural view of a backlight module in the prior art;

FIG. 2 is a schematic structural view of the first embodiment of the backlight module of the present invention;

FIG. 3 is a schematic structural diagram of the second embodiment of the backlight module of the present invention.

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The utility model provides a backlight module.

Referring to FIG. 2 , FIG. 2 is a structural schematic diagram of the first embodiment of the backlight module of the present invention.

The first embodiment of the backlight module proposed by the utility model. In this embodiment, the backlight module includes a backplane 10, a light source 20, a light guide plate 30 arranged on the backplane 10 and relative to the light source 20, an optical film group 40 arranged above the light guide plate 30, and a 10 and fixes the plastic frame 50 of the optical film set 40 , the reflection sheet 60 disposed between the light guide plate 30 and the back plate 10 , and the light shielding layer 70 is provided on the side of the optical film set close to the light source 20 . The light shielding layer 70 is black. In this embodiment, the light source 20 is an LED lamp.

By setting the light-shielding layer 70 on the side of the optical film group close to the light source 20, the light emitted by the light source 20 will not be incident into the optical film, but will be absorbed by the light-shielding layer 70 or blocked on the outside of the optical film group, thereby Reduce light leakage caused by light incident on the optical film group. The backlight module proposed by the utility model can fundamentally prevent the scattered light emitted by the light source 20 from entering the optical film group, regardless of the value of A/P, even when the light mixing distance is relatively short. light leakage phenomenon. In addition, the structure of the backlight module is simple, only the light-shielding layer 70 is provided on the optical film group, and the production is simple, convenient and easy to realize.

Specifically, in this embodiment, the light-shielding layer 70 can be a coating formed by inkjet or printing, a coating formed by sputtering or evaporation, a layer formed by pasting a light-shielding material, or one end of the optical film group A black chemically formed layer produced by chemical treatment. In a word, as long as the light shielding layer 70 capable of shielding light is formed on one side of the optical film group.

Preferably, a first reflective layer is provided on the light shielding layer 70 . The first reflective layer is provided so that the light emitted by the light source 20 can be reflected by the first reflective layer, thereby improving the utilization rate of the light source 20 .

Preferably, the surface of the plastic frame 50 close to the light source 20 is provided with a second reflective layer. When the color of the plastic frame 50 is light-colored, part of the light emitted by the light source 20 will be incident on the plastic frame 50, and a second reflective layer is provided on the plastic frame 50 near the light source 20, thereby further improving the performance of the light source 20. utilization rate.

Specifically, the first reflective layer and the second reflective layer may be reflective sheets pasted on the light shielding layer 70 or reflective materials coated on the light shielding layer 70 .

In the backlight module proposed in the first embodiment, the light shielding layer 70 is provided on the side of the optical film group close to the light source 20, so that the light emitted by the light source 20 will not enter the optical film, but will be shielded by the light shielding layer 70. Absorb or block on the outside of the optical film group, thereby reducing light leakage caused by light incident on the optical film group. The backlight module proposed by the utility model can fundamentally prevent the scattered light emitted by the light source 20 from entering the optical film group, regardless of the value of A/P, even when the light mixing distance is relatively short. light leakage phenomenon. In addition, the structure of the backlight module is simple, only the light-shielding layer 70 is provided on the optical film group, and the production is simple, convenient and easy to realize. The first reflective layer is provided so that the light emitted by the light source 20 can be reflected by the first reflective layer, thereby improving the utilization rate of the light source 20 . The utilization rate of the light source 20 is further improved by providing the second reflective layer on the side of the plastic frame 50 close to the light source 20 . In addition, a second reflective layer is provided on the side of the plastic frame 50 close to the light source 20 , thereby further improving the utilization rate of the light source 20 .

Referring to FIG. 3 , FIG. 3 is a schematic structural diagram of the second embodiment of the backlight module of the present invention.

The utility model proposes a second embodiment of the backlight module. The difference from the first embodiment is that in this embodiment, multiple optical films on the optical film group are stacked on the side close to the light source 20 to form an inclined plane. , the angle between the slope and the bottommost optical film is greater than 90 degrees. The light shielding layer 70 is formed on the inclined surface. Preferably, a reflective layer is provided on the light-shielding layer 70 , so that the light emitted by the light source 20 can be reflected by the inclined surface, thereby further improving the utilization rate of the light source 20 .

Preferably, a second reflective layer is provided on the surface of the plastic frame near the light source. When the color of the plastic frame is light-colored, part of the light emitted by the light source will be incident on the plastic frame, and a second reflective layer is provided on the side of the plastic frame close to the light source, thereby further improving the utilization rate of the light source.

The utility model further provides a liquid crystal display device.

In this embodiment, the liquid crystal display device includes a backlight module, and the specific structure of the backlight module refers to the above-mentioned embodiments, and will not be repeated here.

In this embodiment, by setting a light-shielding layer on the side of the optical film group on the backlight module of the liquid crystal display device close to the light source, the light emitted by the light source will not enter the optical film, but will be absorbed by the light-shielding layer. Or it is blocked on the outside of the optical film group, thereby causing the light leakage phenomenon of the liquid crystal display device. The liquid crystal display device proposed by the utility model can fundamentally prevent light leakage phenomenon no matter what the value of A/P is, even when the light mixing distance is relatively short.

The above are only preferred embodiments of the present utility model, and are not therefore limiting the patent scope of the present utility model. All equivalent structural transformations made by using the utility model specification and accompanying drawings are directly or indirectly used in other related technologies. Fields are all included in the scope of patent protection of the utility model in the same way.

Claims (7)

1. A backlight module, comprising a backplane, a light source, a light guide plate arranged relative to the light source, an optical film group arranged above the light guide plate and an optical film group arranged on the back plate for fixing the optical film group The plastic frame is characterized in that a light-shielding layer is provided on the side of the optical film group close to the light source. 2. The backlight module according to claim 1, wherein the light-shielding layer is a coating, a plating layer, a sticking layer or a chemically formed layer. 3. The backlight module according to claim 1, wherein a plurality of optical films on the optical film group are stacked on a side close to the light source to form an inclined plane, and the inclined plane is aligned with the bottommost optical film. The angle between the diaphragms is greater than 90 degrees. 4. The backlight module according to claim 1 or 3, wherein a first reflective layer is disposed on the light-shielding layer. 5. The backlight module according to claim 4, wherein a second reflective layer is provided on the surface of the plastic frame close to the light source. 6. The backlight module according to claim 5, wherein the first reflective layer and the second reflective layer are reflective sheets pasted on the light-shielding layer or coated on the light-shielding layer reflective material. 7. A liquid crystal display device, characterized by comprising the backlight module according to any one of claims 1-6.

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