CN203404682U

CN203404682U - Backlight module and liquid crystal display device

Info

Publication number: CN203404682U
Application number: CN201320526068.4U
Authority: CN
Inventors: 杨敏娜
Original assignee: Shenzhen TCL New Technology Co Ltd
Current assignee: Shenzhen TCL New Technology Co Ltd
Priority date: 2013-08-27
Filing date: 2013-08-27
Publication date: 2014-01-22
Anticipated expiration: 2023-08-27

Abstract

The utility model discloses a backlight module and a liquid crystal display device. The backlight module comprises a printing circuit board, a reflector plate, a plurality of blue light LEDs arranged on the printing circuit board and a plurality of secondary lenses arranged on the printing circuit board and in one-to-one correspondence to the blue light LEDs. The reflector plate is located on the printing circuit board, the reflector plate is provided with a plurality of holes allowing the secondary lenses to penetrate through, and a plurality of red quantum dots and a plurality of green quantum dots are arranged in the reflector plate. According to the backlight module and the liquid crystal display device, excitation light emitting through the quantum dots is adopted to replace excitation light emitting through fluorescent powder in the prior art, light-emitting luminance and color saturation can be effectively increased by controlling of dimension distribution of quantum dot materials and the combination of the blue light LEDs to carry out excitation light emitting, the problem of chromaticity deviation can be effectively avoided, and due to the fact that light-emitting purity of the quantum dots is high, high-color-gamut backlight can be achieved.

Description

Backlight module and liquid crystal indicator

Technical field

The utility model relates to a kind of technical field of liquid crystal display, particularly a kind of backlight module and liquid crystal indicator.

Background technology

The implementation of existing down straight aphototropism mode set, normally on whole backboard, be covered with white light LEDs, by coordinating secondary lens that single white light LEDs lighting angle is become to large, make whole even back, by LGP and the various blooming pieces of collocation, further improve area source brightness and the uniformity again, finally provide the required high brightness of liquid crystal, high uniformity backlight.

In prior art, white light LEDs is mainly to have fluorescent material to encapsulate and form together with blue-light-emitting chip.Particularly, the white light LEDs of direct-light-type backlight, in the process of using, is difficult to effectively dispel the heat, and heat easily exerts an influence to fluorescent material, causes brightness decline, color saturation deviation and chroma offset.

Utility model content

Main purpose of the present utility model is for providing a kind of white light that can easily realize high brightness, high colour gamut and high color saturation backlight module backlight and the liquid crystal indicator that comprises this backlight module.

The utility model proposes a kind of backlight module, comprise printed circuit board (PCB), reflector plate, a plurality of be arranged on blue-ray LED on printed circuit board (PCB) and a plurality of be arranged on described printed circuit board (PCB) and with described blue-ray LED secondary lens one to one; Described reflector plate is positioned on described printed circuit board (PCB), and described reflector plate has the hole that the described secondary lens of a plurality of confessions passes, and is provided with some red quantum dots and some green quantum dots in described reflector plate.

Preferably, described red quantum dot and described green quantum dot are evenly distributed in described reflector plate.

Preferably, also comprise backboard, described backboard comprises the side plate of base plate and four inclinations, and described printed circuit board (PCB) is arranged on described base plate, and described reflector plate covers the surface of described printed circuit board (PCB) and the surface of described side plate.

Preferably, also comprise be positioned at directly over blue-ray LED for weakening a plurality of optical filters of blue light.

Preferably, also comprise diffuser plate and blooming piece, described diffuser plate is arranged on the top of described a plurality of secondary lens, and described blooming piece is located at the top of described diffuser plate.

Preferably, described optical filter is attached on described diffuser plate surface or is attached on described blooming piece.

The utility model also proposes a kind of liquid crystal indicator, comprises backlight module as above.

Backlight module of the present utility model and liquid crystal indicator, adopt the luminous alternative prior art excitated fluorescent powder of excitation quantum point luminous, and then can be by controlling the Size Distribution of quanta point material and carrying out stimulated luminescence in conjunction with blue-ray LED, can there be the luminous brightness of effective increase and color saturation, and can effectively avoid chroma offset problem, because the luminance purity of quantum dot is higher, therefore can realize high colour gamut backlight again.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model backlight module the first embodiment;

Fig. 2 is quantum dot distribution schematic diagram in the reflector plate of the utility model backlight module the first embodiment;

Fig. 3 is the light schematic diagram of the secondary lens of the utility model backlight module the first embodiment;

Fig. 4 is the structural representation of the utility model backlight module the second embodiment.

The realization of the utility model object, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.

The specific embodiment

Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.

With reference to Fig. 1-3, Fig. 1 is the structural representation of the utility model backlight module the first embodiment, Fig. 2 is quantum dot distribution schematic diagram in the reflector plate of the utility model backlight module the first embodiment, and Fig. 3 is the light schematic diagram of the secondary lens of the utility model backlight module the first embodiment.

The backlight module that this embodiment proposes, comprise printed circuit board (PCB) 60, a plurality of be arranged on blue-ray LED 10 on printed circuit board (PCB) 60, a plurality of be arranged on printed circuit board (PCB) 60 and with blue-ray LED 10 secondary lens 30, reflector plate 20 one to one.Described reflector plate 20 is positioned on printed circuit board (PCB) 60, and reflector plate 20 has a plurality of holes of passing for secondary lens 30.Secondary lens 30 bottoms are provided with for accommodating the groove 31 of blue-ray LED, are provided with some red quantum dots and some green quantum dots in reflector plate 20.Concrete, backlight module also comprises backboard 70, diffuser plate 40 and blooming piece 50, diffuser plate 40 is arranged on the top of a plurality of secondary lens 30, blooming piece 50 is located at the top of diffuser plate 40, backboard 70 comprises the side plate 72 of base plate 71 and four inclinations, printed circuit board (PCB) 60 is arranged on base plate 71, and reflector plate 20 covers the surface of printed circuit board (PCB) 60 and the surface of four side plates 72.

The bright dipping mode of the backlight module of the present embodiment is: most of light (blue ray) that blue-ray LED 10 sends has three kinds of light directions after entering secondary lens 30, wherein: 1, seldom the light of amount directly penetrates from the top of secondary lens 30, arrive diffuser plate; 2, a part of light, via after secondary lens 30 total reflections and reflecting, from the side outgoing of secondary lens 30, arrives reflector plate 20; 3, after another part light reflects via secondary lens 30, from the two sides outgoing of secondary lens 30, along the both sides transmission of blue-ray LED 10.The red quantum dot that light is mapped in reflector plate 20 inspires ruddiness, the green quantum dot that light is mapped in reflector plate 20 inspires green glow, the ruddiness inspiring, green glow reflect and the blue light penetrating from secondary lens 30 from reflector plate 20, and in the region between reflector plate 20 and diffuser plate 40, mixed light obtains white light and arrives diffuser plate 40.The white light being mixed to get is broken up homogenising through the diffusion of diffuser plate 40 by light, then coordinates blooming piece 50 that light is uniformly distributed.

Compared to prior art, the backlight module of the present embodiment, adopt the luminous alternative prior art excitated fluorescent powder of excitation quantum point luminous, and then can be by controlling the Size Distribution of quanta point material and carrying out stimulated luminescence in conjunction with blue-ray LED 10, can there be the luminous brightness of effective increase and color saturation, and can effectively avoid chroma offset problem, again because the luminance purity of quantum dot is higher, therefore can realize high colour gamut backlight.

More even for the light that backlight module is sent, the present embodiment is evenly distributed on red quantum dot and green quantum dot in described reflector plate 20.

Further, with reference to Fig. 4, Fig. 4 is the structural representation of the utility model backlight module the second embodiment, the scheme of the present embodiment based on the first embodiment.The backlight module of the present embodiment also comprise be positioned at directly over blue-ray LED 10 for weakening a plurality of optical filters 80 of blue light, optical filter 80 is attached to diffuser plate 40 surfaces upper (upper surface or lower surface) or is attached to blooming piece 50(upper surface or lower surface) on.It is example that the present embodiment be take the upper surface that optical filter 80 is attached to blooming piece 50.The blue light sending due to blue-ray LED 10 has minority to penetrate directly over secondary lens 30, ruddiness and green glow directly over secondary lens 30 are fewer, mixed light is fainter, the blue light that has part can be arrived and reach diffuser plate 40 without mistake mixed light, makes the meeting backlight after diffuser plate 40 and blooming piece 50 homogenising partially blue.In order to remove the blue light in backlight, make color backlight even, obtain uniform white backlight, therefore the corresponding LED10 of upper surface at blooming piece 50 attaches for weakening a plurality of optical filters 80 of blue light.

The utility model also proposes a kind of liquid crystal indicator, comprises backlight module, and this backlight module can comprise that earlier figures 1 is to all technical schemes in embodiment illustrated in fig. 4, and its detailed structure can, with reference to previous embodiment, not repeat at this.

The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model description and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.

Claims

1. a backlight module, is characterized in that, comprise printed circuit board (PCB), reflector plate, a plurality of be arranged on blue-ray LED on printed circuit board (PCB) and a plurality of be arranged on described printed circuit board (PCB) and with described blue-ray LED secondary lens one to one; Described reflector plate is positioned on described printed circuit board (PCB), and described reflector plate has the hole that the described secondary lens of a plurality of confessions passes, and is provided with some red quantum dots and some green quantum dots in described reflector plate.

2. backlight module according to claim 1, is characterized in that, described red quantum dot and described green quantum dot are evenly distributed in described reflector plate.

3. backlight module according to claim 1, it is characterized in that, also comprise backboard, described backboard comprises the side plate of base plate and four inclinations, described printed circuit board (PCB) is arranged on described base plate, and described reflector plate covers the surface of described printed circuit board (PCB) and the surface of described side plate.

4. backlight module according to claim 1, is characterized in that, also comprise be positioned at directly over blue-ray LED for weakening a plurality of optical filters of blue light.

5. backlight module according to claim 4, is characterized in that, also comprises diffuser plate and blooming piece, and described diffuser plate is arranged on the top of described a plurality of secondary lens, and described blooming piece is located at the top of described diffuser plate.

6. backlight module according to claim 5, is characterized in that, described optical filter is attached on described diffuser plate or is attached on described blooming piece.

7. a liquid crystal indicator, is characterized in that, comprises the backlight module as described in any one in claim 1-6.