CN203757520U

CN203757520U - Side-entry LED backlight module and display device

Info

Publication number: CN203757520U
Application number: CN201420145087.7U
Authority: CN
Inventors: 陈耀华; 熊书明; 陈智辉
Original assignee: Huarui Photoelectric (huizhou) Co Ltd; HUIZHOU HUARUI LIGHT SOURCE SCIENCE & TECHNOLOGY Co Ltd
Current assignee: Huarui Photoelectric (huizhou) Co Ltd; HUIZHOU HUARUI LIGHT SOURCE SCIENCE & TECHNOLOGY Co Ltd; Huizhou Very Light Source Technology Co Ltd
Priority date: 2014-03-27
Filing date: 2014-03-27
Publication date: 2014-08-06
Anticipated expiration: 2024-03-27

Abstract

The utility model is applicable to the backlight technical field and provides a side-entry LED backlight module and a display device. The backlight module comprises a light guide plate and an LED light bar arranged on the light incoming face of the light guide plate. The LED light bar comprises a printed circuit board (PCB) and a plurality of LED light sources arranged on the PCB at equal intervals and arranged in a line. The light emitting faces of the LED light sources are perpendicular to the surface of the PCB and face towards the light incoming face of the light guide plate and deviate towards the center area of the light incoming face of the light guide plate, and the deviation angles of the plurality of light emitting faces are changed towards the two sides symmetrically gradually. According to the backlight module and the display device, the LED light emitting faces deviate by certain angles symmetrically from the middle to the two sides, so that the brightness of the backlight module is changed uniformly from the middle to the two sides slowly; the LED light sources are arranged at equal intervals, so that cooling conditions of all positions are identical, the LED attenuation ageing rate everywhere is identical, and the long service life of the backlight module is guaranteed; spots of the light guide plate are not needed to be designed specially, the light guide plate development complexity is simplified, and the cost is saved.

Description

A kind of side entering-type LED backlight module and display device

Technical field

The utility model relates to backlight technology field, relates in particular to a kind of side entering-type LED backlight module and display device.

Background technology

At display device, manufacture field as television set, centered by the Luminance Distribution of the backlight module of the desirable television set that common manufacturer is desired, briliancy is high, surrounding briliancy is slightly low, brightness everywhere slowly changes, so both can promote the center briliancy of display floater, can not leave in viewing area visual brightness and change vestige, thereby reach energy-conservation object yet.At present, the scheme that realizes the gradual change of backlight module briliancy has following two kinds: the first, by controlling the spacing of LED on PCB, adjust Luminance Distribution, LED comparatively dense in the middle of making, edge LED is more sparse, the shortcoming of this scheme is: when the spacing of LED is wide, can on backlight module, form hot spot phenomenon, it is firefly phenomenon, thereby the display device of narrow frame is made in impact, and because LED spacing is different, the situation of dispelling the heat everywhere difference, cause the temperature of different LED different, and then make the speed that LED decays aging different everywhere, make to reach the longest the service life of backlight module and display device, the second, brightness is adjusted in distribution by light guide plate mesh point, but this scheme need to be modulated the size of site and density in two dimensions of LGP, complex structure, R&D cycle is long, and cost is high, and the light that sends of LED can not effectively deviation to the central area of LGP, quite a few light is depleted in transmitting procedure, and the method effect that realizes brightness gradual change by leaded light site is unsatisfactory.

Utility model content

The purpose of this utility model is to provide a kind of side entering-type LED backlight module, make its briliancy by centre to edge slow even variation, guarantee each LED synchronous fading simultaneously, extend the life-span of backlight module, and simplify the structure of LGP, shorten the R&D cycle, save cost.

The utility model is achieved in that a kind of side entering-type LED backlight module, the LED lamp bar that comprises LGP and be arranged at the incidence surface of described LGP, and described LED lamp bar comprises pcb board and in a plurality of LED light sources of described pcb board equal intervals and word order; The light-emitting area of described LED light source is vertical with the surface of described pcb board and towards the incidence surface of described LGP, the light-emitting area of described LED light source is to the central area deflection of the incidence surface of described LGP, and the deflection angle of the light-emitting area of a plurality of LED light sources is certainly middle to both sides symmetrical expression gradual change.

As optimal technical scheme of the present utility model:

The difference of the deflection angle of the light-emitting area of adjacent described LED light source is less than 3 °.

The difference that is positioned at the deflection angle of the light-emitting area of LED light source at two ends and the light-emitting area of the LED light source of center is less than 30 °.

The surface of described LGP is densely covered with leaded light site, described leaded light site in the direction that is parallel to described LED lamp bar equal and opposite in direction and density constant, in the direction perpendicular to described LED lamp bar, by centre, to both sides, diminished gradually.

Described leaded light site is sparse gradually to both sides by centre in the direction perpendicular to described LED lamp bar.

One side of described LGP is provided with described LED lamp bar.

The relative both sides of described LGP be respectively provided with one described in LED lamp bar.

Another object of the present utility model is to provide a kind of display device, comprises display screen and for described display screen provides backlight module backlight, and described backlight module adopts described side entering-type LED backlight module.

The light-emitting area that the side entering-type LED backlight module that the utility model provides makes LED light source by centre to both sides symmetrical expression deflection certain angle, and be partial to the central area of LGP, the briliancy that makes backlight module by centre to both sides slow even variation, meet the requirement of manufacturer; And due to LED light source spaced set, make the situation of dispelling the heat identical everywhere, guarantee that everywhere the LED light source aging speed that decays is identical, and then guaranteed the service life that backlight module is longer; And can not form hot spot, be conducive to the narrow frame design of display device; Further, do not need the site of LGP to carry out particular design, need in two dimensions, not design size and the density of site, greatly simplified the research and development complexity of LGP, shortened the R&D cycle, save cost.

Accompanying drawing explanation

Fig. 1 is the perspective view of the side entering-type LED backlight module that provides of the utility model embodiment;

Fig. 2 is the planar structure schematic diagram of the side entering-type LED backlight module that provides of the utility model embodiment.

The specific embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.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.

Fig. 1,2 shows respectively solid and the plane structural representation of the side entering-type LED backlight module that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the present embodiment.

Please refer to Fig. 1 and Fig. 2, this side entering-type LED backlight module comprises LGP 1 and LED lamp bar 2, LED lamp bar 2 is arranged at incidence surface one side of LGP 1, specifically a LED lamp bar 2 can be set in a side of LGP 1, also a LED lamp bar 2 can be respectively set at two opposite sides of LGP 1, specifically according to the actual demand setting of application end.LED lamp bar 2 comprises pcb board 21 and is arranged at a plurality of LED light sources 22 on pcb board 21, and the plurality of LED light source 22 is equidistantly and along lamp bar length direction word order.And the light-emitting area 221 of LED light source 22 is vertical with the surface of pcb board 21 and towards the incidence surface of LGP 1, is about to LED light source and stands on pcb board luminous towards the incidence surface of LGP 1.In addition, the light-emitting area of LED light source 22 is all to the central area deflection of the incidence surface of LGP, except middle one or the light-emitting area 221 of a few LED light source 22 and the incidence surface of LGP 1 parallel, other LED light sources 22 are all not parallel with the incidence surface of LGP.And, the deflection angle of the light-emitting area 221 of a plurality of LED light sources 22 is certainly middle to both sides symmetrical expression gradual change, that is to say, the light-emitting area 221 of each LED light source 22 is towards the deflection of the central area of LGP 1, and the normal integral body of the light-emitting area 221 of a plurality of LED light sources 22 is convergent manner and mirror image is symmetrical.

The light-emitting area 221 that the side entering-type LED backlight module that the present embodiment provides makes LED light source 22 by centre to both sides symmetrical expression deflection certain angle, and be partial to the central area of the incidence surface of LGP 1, make backlight module LGP 1 exiting surface briliancy by the slow even variation of mind-set surrounding, meet the requirement of manufacturer; And due to LED light source 22 spaced sets, make the situation of dispelling the heat identical everywhere, guarantee that the aging speed of LED light source 22 decay is everywhere identical, and then guaranteed the service life that backlight module is longer; Further, do not need the site of LGP 1 to carry out particular design, need in two dimensions, not design size and the density of site, greatly simplified the research and development complexity of LGP, shortened the R&D cycle, save cost.

Further, for better realize LGP 1 exiting surface briliancy by the slow even variation of mind-set surrounding, the present embodiment is designed to the difference of the deflection angle of the light-emitting area of adjacent LED light source 22 in 3 °, in so little angle excursion, the brightness that can guarantee LGP 1 bright dipping changes slowly evenly, there is not bright dark variation vestige, improve back of the body uniformity of light.

Further, the central area of exiting surface and the briliancy of surrounding for fear of the LGP 1 of backlight module have big difference, can limit the deflection angle of the light-emitting area 221 of the LED light source 22 on LED lamp bar 2 both sides, concrete, the difference of the deflection angle of the light-emitting area of LED light source 22 at two ends and the light-emitting area of the LED light source of center 22 is less than 30 °.

Further, because the present embodiment has been realized the briliancy gradual change of exiting surface of the LGP 1 of backlight module by arranging of the light-emitting area 221 to LED light source 22, so the structure of LGP 1 can be simplified.Concrete, the surface of LGP 1 is densely covered with leaded light site, and this leaded light site is equal and opposite in direction in the direction that is parallel to LED lamp bar 2, density is constant, in the direction perpendicular to LED lamp bar 2, by centre, to both sides size, diminished gradually, or density diminishes, or size and density diminish simultaneously.In a word, only need in a dimension, design the distribution of leaded light site, its R&D cycle shortens greatly, and then provides cost savings.

Certainly, this backlight module can also comprise other blooming pieces, as diffusion sheet, blast sheet etc. are set on the exit facet at LGP 1, reflector plate is set to improve the utilization rate etc. of light at the back side of LGP 1, and the present embodiment repeats no longer one by one.

The side entering-type LED backlight module that the utility model provides is applicable in various display devices, and the display device that therefore comprises this backlight module is also in protection domain of the present utility model.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. a side entering-type LED backlight module, is characterized in that, the LED lamp bar that comprises LGP and be arranged at the incidence surface of described LGP, and described LED lamp bar comprises pcb board and in a plurality of LED light sources of described pcb board equal intervals and word order; The light-emitting area of described LED light source is vertical with the surface of described pcb board and towards the incidence surface of described LGP, the light-emitting area of described LED light source is to the central area deflection of the incidence surface of described LGP, and the deflection angle of the light-emitting area of a plurality of LED light sources is certainly middle to both sides symmetrical expression gradual change.

2. side entering-type LED backlight module as claimed in claim 1, is characterized in that, the difference of the deflection angle of the light-emitting area of adjacent described LED light source is less than 3 °.

3. side entering-type LED backlight module as claimed in claim 1, is characterized in that, the difference that is positioned at the deflection angle of the light-emitting area of LED light source at two ends and the light-emitting area of the LED light source of center is less than 30 °.

4. the side entering-type LED backlight module as described in claim 1 or 2 or 3, it is characterized in that, the surface of described LGP is densely covered with leaded light site, described leaded light site in the direction that is parallel to described LED lamp bar equal and opposite in direction and density constant, in the direction perpendicular to described LED lamp bar, by centre, to both sides, diminished gradually.

5. side entering-type LED backlight module as claimed in claim 4, is characterized in that, described leaded light site is sparse gradually to both sides by centre in the direction perpendicular to described LED lamp bar.

6. the side entering-type LED backlight module as described in claim 1 or 2 or 3, is characterized in that, a side of described LGP is provided with described LED lamp bar.

7. the side entering-type LED backlight module as described in claim 1 or 2 or 3, is characterized in that, the relative both sides of described LGP be respectively provided with one described in LED lamp bar.

8. a display device, comprises display screen and for described display screen provides backlight module backlight, it is characterized in that, described backlight module adopts the side entering-type LED backlight module described in claim 1 to 7 any one.