CN202469772U - Direct-light-type backlight source and displaying device - Google Patents

Abstract

The utility model discloses a direct-type backlight source and a display device, which relate to the technical field of display. The direct type backlight source includes: a light source and a back plate, the back plate is provided with a through hole, and the light source is placed in the through hole. The direct-type backlight source and display device of the utility model embeds the light source into the backboard, and realizes the effect of thinning the overall thickness of the direct-type backlight source while reducing the mixed light height, and reduces the cost while good heat dissipation. In the direct-lit backlight source and display device of the present invention, the light source and the bottom reflection sheet can be substantially flush, effectively prolonging the light mixing distance, making the mixed light more uniform, and achieving better optical effects.

Description

Direct-lit backlight source and display device

technical field

The utility model relates to the field of display technology, in particular to a direct-down backlight source and a display device.

Background technique

At present, in Flat Panel Display (FPD) technology, Liquid Crystal Display (LCD) is dominant, and transmissive LCD is the mainstream of current LCD technology. Since the LCD itself does not emit light, a backlight is essential for a transmissive LCD. Traditional LCD usually uses Cold Cathode Fluorescent Lamps (CCFL) as the light source. With the rapid development of Light Emitting Diode (LED) manufacturing and packaging technology, LED has high luminous efficiency, long life, wide color gamut, Mercury-free and other advantages gradually replaced CCFL as the mainstream of backlight.

According to different distribution positions of light sources, backlights can be divided into edge-lit backlights and direct-lit backlights. The LEDs of the edge-lit backlight are installed on the side of the light guide plate, and the light guide plate is used for light and color mixing, and the white light formed by the color mixing is coupled to the panel. In this structure, when the size of the backlight source is too large, the efficiency and brightness uniformity will be greatly reduced. On the other hand, the LEDs of the direct-type backlight are installed on the bottom of the backlight module, and the light emitted by it can be easily and efficiently coupled to the panel. In large-size LCD applications, it can ensure uniform brightness distribution and achieve energy-saving effects.

As shown in FIG. 1 and FIG. 2 , the direct-lit backlight includes a backplane 1 , a printed circuit board 2 , an LED light emitting unit 3 , and an optical film 4 . The printed circuit board 1 of a typical direct-lit backlight LED needs to be pasted or screwed on the backplane 1, and the printed circuit board 2 and the backplane 1 usually need to be connected with a thermally conductive tape 5 for better heat dissipation. An optical film material 4 such as a diffuser plate is arranged at a certain light mixing height. Such a direct-type backlight has poor heat dissipation, difficult control of light mixing height, and can not achieve ultra-thin effect, so it is difficult to meet the trend of ultra-thin development of existing display devices.

Utility model content

(1) Technical problems to be solved

The technical problem to be solved by the utility model is to provide a direct-lit backlight source and a display device that can realize ultra-thinness, good heat dissipation and low cost.

(2) Technical solution

In order to solve the above problems, the utility model provides a direct type backlight, comprising: a light source and a back plate, the back plate is provided with a through hole, and the light source is placed in the through hole.

Preferably, the backlight further includes: a printed circuit board, and the light source is electrically connected to the printed circuit board.

Preferably, the printed circuit board is fixed on the backside of the backplane opposite to the light exiting side.

Preferably, a thermally conductive adhesive tape is provided between the printed circuit board and the backplane except for the part connected to the light source.

Preferably, the light source is an LED lighting unit.

The utility model also provides a display device, which includes the above-mentioned direct-lit backlight source.

(3) Beneficial effects

The direct-type backlight source and display device of the utility model embeds the light source into the backboard, and realizes the effect of thinning the overall thickness of the direct-type backlight source while reducing the mixed light height, and reduces the cost while good heat dissipation. In the direct-lit backlight source and display device of the present invention, the light source and the bottom reflector can be substantially flush, effectively prolonging the light mixing distance, making the mixed light more uniform, and achieving better optical effects.

Description of drawings

FIG. 1 is a schematic structural view of a conventional direct-type backlight;

FIG. 2 is a schematic cross-sectional view of the backplane of the direct-lit backlight shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of a direct-lit backlight according to an embodiment of the present invention.

Detailed ways

The direct-lit backlight source and display device provided by the utility model are described in detail below in conjunction with the accompanying drawings and embodiments.

A direct-lit backlight according to an embodiment of the present invention includes: a light source 3 and a back plate 1 . In the backlight of this embodiment, the light source is preferably an LED light-emitting unit. As shown in FIG. 3 , a through hole for accommodating the LED light emitting unit is provided on the backplane 1 , and the LED light emitting unit is placed in the through hole.

In the direct-lit backlight of the present utility model, each LED light-emitting unit is completely embedded in the through hole on the backplane 1 from the outer surface of the backplane 1 (the back of the light emitting surface), thereby reducing light mixing. At the same time, the overall thickness of the direct-lit backlight is thinned.

In addition, the backlight also includes: a printed circuit board 2, each LED light-emitting unit is electrically connected to the printed circuit board 2, and the printed circuit board 2 is fixed on the outer surface of the backplane 1, for heat dissipation, the printed circuit board 2 and the A heat-conducting tape 5 is provided between the backplanes 1 except for the part connected to the LED light-emitting unit, which not only solves the technical problem of difficult heat dissipation of the backlight, but also does not require the heat-dissipating tape 5 to be attached to the corresponding part of the LED light-emitting unit, which reduces the cost.

The utility model also provides a display device. The display device includes the above-mentioned direct-type backlight source. Therefore, in the display device, the light source and the bottom reflection sheet can be substantially flush, effectively prolonging the light mixing distance, and making the light mixing The resulting light is more uniform and can achieve better optical effects. The display device can be a cell phone, a digital photo frame, a tablet computer, a liquid crystal TV, a liquid crystal display, or any other LCD that requires a direct backlight, and this is not a limitation to the technical solution of the present invention.

The above embodiments are only used to illustrate the utility model, but not to limit the utility model. Those of ordinary skill in the relevant technical fields can also make various changes and modifications without departing from the spirit and scope of the utility model. , so all equivalent technical solutions also belong to the category of the utility model, and the patent protection scope of the utility model should be defined by the claims.

Claims (6)

1. A direct type backlight source, comprising: a light source and a back plate, characterized in that a through hole is arranged on the back plate, and the light source is placed in the through hole. 2 . The direct-lit backlight according to claim 1 , wherein the backlight further comprises: a printed circuit board, and the light source is electrically connected to the printed circuit board. 3. The direct-lit backlight according to claim 2, wherein the printed circuit board is fixed on the back surface of the backplane opposite to the light emitting surface. 4 . The direct-lit backlight according to claim 2 , wherein a heat-conducting adhesive tape is arranged between the printed circuit board and the backplane except for the part connected to the light source. 5. The direct-lit backlight according to any one of claims 1-4, wherein the light source is an LED light emitting unit. 6 . A display device, comprising the direct-lit backlight according to claim 5 .

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