CN203363863U - Straight down type backlight module and display device - Google Patents

Abstract

The utility model provides a direct-type backlight module and a display device, belonging to the field of display technology, which can solve the problem of increasing the brightness of the direct-type backlight module in the prior art, which leads to increased production costs, large energy consumption, and difficulty in heat dissipation. A series of problems such as poor brightness uniformity. The direct type backlight module of the utility model includes a light box and a light emitting unit, the light box opening is arranged on the upper part of the light box, and the light emitting unit is set at the bottom of the light box, wherein, the inner side of the side wall of the light box is pasted with a reflective film layer. The utility model can be used to improve the brightness and uniformity of the direct-type backlight module.

Description

A direct type backlight module and display device

technical field

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

Background technique

Liquid crystal displays are widely used due to their excellent quality, but since the liquid crystal itself does not emit light, a backlight module is required to provide the bright light required for image display. Backlight modules are mainly divided into two types: direct type and side type. The direct-type backlight module generally includes a light box, a backlight panel and a light-emitting unit. There is a light box opening on the upper part of the light box, a backlight plate is set at the bottom of the light box, and a light-emitting unit is set on the backlight plate. The light emitted by it is directly directed to the liquid crystal display panel through the light box opening. . In order to have a better viewing effect from all angles, the liquid crystal display screen needs to meet the requirement of brightness uniformity, so the brightness of the emitted light of the backlight module must be uniform. In order to meet the above requirements, when designing direct-lit backlight modules, it is usually necessary to use optical films such as diffusion films and prism sheets. However, after the light passes through multi-layer optical films, the phenomenon of light loss is very serious, so it is necessary to improve the backlight module. brightness. At the same time, the resolution of the liquid crystal screen is continuously improved, and a backlight module with a higher brightness is also required to achieve a better picture effect.

In order to increase the brightness of the backlight module, it is mostly achieved by increasing the power of the light source of the backlight module. For example, for a backlight module using an LED (Light Emitting Diode, light emitting diode) as a light source, a higher power LED is usually used to increase the brightness of the backlight module.

The inventors have found that there are at least the following problems in the prior art: increasing the brightness of the backlight module by increasing the light source power of the backlight module (for example, using a higher power LED) will lead to increased production costs, high energy consumption, and difficulty in heat dissipation. A series of problems such as poor brightness uniformity. Therefore, there is an urgent need to solve the problem of increasing the brightness of the backlight module under the condition that the power of the light source is constant.

Utility model content

The technical problems to be solved by the utility model include, aiming at a series of problems in the prior art, such as improving the brightness of the direct-lit backlight module, resulting in increased production costs, high energy consumption, difficult heat dissipation, poor brightness uniformity, etc., to provide an energy-efficient The production cost is reduced, the energy consumption is small, the brightness is high and the uniformity is good, and the direct-lit backlight module and the display device are provided.

The technical solution adopted to solve the technical problem of the utility model is a direct-type backlight module, which includes a light box and a light-emitting unit. The inner side of the side wall of the light box is pasted with a reflective film layer.

Preferably, the reflective film layer is a silver reflective sheet.

Preferably, the direct-lit backlight module further includes a backlight plate, the backlight plate is arranged at the bottom of the light box, and the light emitting unit is arranged on the backlight plate.

Preferably, a reflective film is provided on the surface of the backlight panel facing the opening of the light box.

Preferably, the opening of the light box is provided with an optical film layer, and the optical film layer includes at least one of a diffusion plate, a diffusion film and a brightness enhancement film.

Preferably, the light emitting unit is an LED light bar.

Preferably, the LED light bar includes white LED lights.

Preferably, the LED light bar includes a printed circuit board.

The side wall of the light box of the direct-type backlight module of the utility model is attached with a reflective film layer, thereby improving the brightness of the backlight module, so that a low-power light-emitting device can be used as the light source of the backlight module, and then the backlight module The group has the advantages of low energy consumption, easy heat dissipation, long life, reduced cost, good luminous uniformity, high contrast, high color saturation, etc., and can also make the display device ultra-thin and light.

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

Since the display device of the present invention includes the direct-lit backlight module, the display screen has high brightness, good uniformity, and better display effect.

Description of drawings

Fig. 1 is the structural sectional view of the direct type backlight module of embodiment 1 of the present utility model;

2 is a schematic diagram of a backlight panel and an LED light bar of a direct-lit backlight module according to Embodiment 1 of the present invention;

The reference signs are: 1. light box; 11. side wall; 2. LED light; 3. LED light bar; 4. backlight panel; 5. reflective film; 6. diffusion plate; 7. diffusion film; 8. brightening 9. Reflective film layer.

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:

This embodiment provides a direct type backlight module, as shown in FIG. 1 , which includes a light box 1 and a light emitting unit for emitting light.

The light box 1 has side walls 11 (only two side walls are shown in FIG. 1 ), a light box opening is arranged on the top of the light box 1, and a light-emitting unit is arranged at the bottom of the light box 1 and emits light toward the light box opening, wherein the inside of the light box side walls 11 A reflective film layer 9 is attached, and obviously the four sidewall inner sides of the light box are all pasted with a reflective film layer 9 to reflect light more.

Preferably, the reflective film layer 9 is a silver reflective sheet. The silver reflector has a high light reflectivity, which can be as high as 98%. After the silver reflector is pasted on the inside of the side wall of the light box, especially on the inside of the four side walls, the brightness of the backlight module can be greatly improved.

Preferably, the direct type backlight module in this embodiment further includes a backlight plate 4 , the backlight plate 4 is arranged at the bottom of the light box 1 , and the light emitting unit is arranged on the backlight plate 4 .

Further preferably, a reflective film 5 is provided on the surface of the backlight plate 4 facing the opening of the light box to enhance light reflection.

Preferably, the opening of the light box is provided with an optical film layer. The optical film layer provided in this embodiment includes a diffusion plate 6, a diffusion film 7 and a brightness enhancement film 8, thereby enhancing the brightness and uniformity of the outgoing light (the optical film layer can be adjusted according to actual conditions). The number or type of film layers to improve the brightness and uniformity of the backlight).

Preferably, the light-emitting unit is an LED light bar 3 (as shown in Figures 1 and 2, the backlight module in this embodiment only shows three LED light bars 3 on the backlight plate 4, and each LED light bar 3 Three LED lamps 2 are arranged on the top, and a plurality of LED lamp bars 3 can be arranged as required in actual production, and the number of LED lamps 2 on each LED lamp bar 3 can also be set as required).

Further preferably, the LED light bar 3 includes a white LED light. This embodiment only uses a white LED light as an example for illustration, and there is no limitation on the type of the LED light, and it can also be a blue LED light or other light sources. After the side wall 11 of the light box 1 is pasted with a silver reflector, the brightness of the backlight module is improved, so the backlight module of this embodiment uses a low-power LDE lamp, thereby reducing heat generation, reducing energy consumption, and low power consumption. The LED lights have a large luminous angle, which can reach 140° (the luminous angle of high-power LED lights is usually only about 100°), which can improve the brightness uniformity of the backlight module.

More preferably, the LED light bar includes a printed circuit board (that is, the LED lamp is arranged on the printed circuit board), and the use of the printed circuit board can make the manufacturing process relatively simple.

Among them, the printed circuit board can be an FR4 (Fire Resist, FR for short, FR4 is a code name for a flame-resistant material grade) printed circuit board. The use of low-power LED lamps generates little heat, so FR4 printed circuit boards can be used, which will not affect their service life and save production costs. In comparison, high-power LED lamps generate high heat, requiring the use of MCPCB (Metal Core PCB, MCPCB for short, metal-based printed circuit board) with good heat dissipation effect, so the production cost will be increased accordingly.

The inside of the side wall of the light box of the backlight module in this embodiment is attached with a reflective film layer, thereby improving the brightness of the backlight module, and using a low-power light-emitting device as the light source of the backlight module, and then making the backlight module have The advantages of low energy consumption, easy heat dissipation, long life, reduced cost, good luminous uniformity, high contrast, and high color saturation can also make the display device ultra-thin and light.

Example 2:

This embodiment provides a display device, which includes the above-mentioned direct-lit backlight module, and of course also includes known structures such as an array substrate and a color filter substrate. The display device may 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, a navigator, and the like.

Since the display device in this embodiment includes the above-mentioned direct-type backlight module, the brightness of the outgoing light is improved, and the uniformity of the brightness is improved, so that the brightness of the display screen of the display device is high and more uniform, and the display effect is better. good.

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 (9)

1. a down straight aphototropism mode set, comprise lamp box and luminescence unit, and the lamp box opening is established on described lamp box top, and described luminescence unit is located at described lamp box bottom, it is characterized in that,

The inside sidewalls of described lamp box is posted reflective coating.

2. down straight aphototropism mode set according to claim 1, is characterized in that, described reflective coating is silver-colored reflector plate.

3. down straight aphototropism mode set according to claim 1, is characterized in that, described down straight aphototropism mode set also comprises backlight, and described backlight is located at described lamp box bottom, and described luminescence unit is located on described backlight.

4. down straight aphototropism mode set according to claim 3, is characterized in that, described backlight is provided with reflectance coating in the face of the surface of described lamp box opening.

5. down straight aphototropism mode set according to claim 1, is characterized in that, described lamp box opening is provided with optical film, and described optical film comprises at least one in diffuser plate, diffusion barrier and brightness enhancement film.

6. down straight aphototropism mode set according to claim 1, is characterized in that, described luminescence unit is LED lamp bar.

7. down straight aphototropism mode set according to claim 6, is characterized in that, described LED lamp bar comprises white LED lamp.

8. down straight aphototropism mode set according to claim 6, is characterized in that, described LED lamp bar comprises printed circuit board (PCB).

9. a display unit, is characterized in that, described display unit comprises: the described down straight aphototropism mode set of claim 1 to 8 any one.

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