CN103175033A

CN103175033A - Side light source light-emitting diode (LED) backlight module

Info

Publication number: CN103175033A
Application number: CN2013100973980A
Authority: CN
Inventors: 江政升; 曾威扬; 赵圣杰
Original assignee: Nanjing CEC Panda LCD Technology Co Ltd
Current assignee: Nanjing CEC Panda LCD Technology Co Ltd
Priority date: 2013-03-25
Filing date: 2013-03-25
Publication date: 2013-06-26
Anticipated expiration: 2033-03-25
Also published as: CN103175033B

Abstract

The invention discloses a side light source light-emitting diode (LED) backlight module. The side light source LED backlight module comprises a light guide plate and a reflective sheet, wherein the light guide plate is provided with a light-in surface and a light-out surface, and an LED light source is arranged on one side of the light-in surface; and the reflective sheet is located below the light guide plate, a plurality of notches in spaced preset distance are formed on one side of the reflective sheet at intervals, and each notch is arranged on the position, corresponding to LED lights, in the reflective sheet so as to reduce reflection brightness of the position of the light source. The width of each notch is smaller than the widths of reflective surfaces of the LED lights, the depth of each notch is larger than the heights of the LED lights, and each notch is a quadrate notch, a triangular notch, a semicircle notch or an oval notch. Due to the technical scheme of the side light source LED backlight module, the notches in the reflective sheet are correspondingly matched with the light source LED lights of the backlight module to reduce reflection light on an arranged position of the LED light source corresponding to the reflective sheet, and accordingly when the distance (Pitch) among LEDs is too large, appearance of dark space among the LEDs is avoided, and the optical abnormal phenomenon that brightness of the light-in surface of the light guide plate is uneven is improved effectively.

Description

Side light source LED-backlit module

Technical field

The present invention relates to a kind of LED-backlit module, relate in particular to the side entering type LED light source backlight module that liquid crystal indicator is used.

Background technology

Along with development and the client of LED lamp technology has been tending towards obviously to liquid crystal display and the lightening demand of LCD TV, the backlight module of side entering type LED light source (the LED lamp is placed on the side of LGP) has become the main flow of this 2 years prior aries; The backlight module of side entering type LED light source has energy-saving and environmental protection, low-power consumption, the advantage such as ultra-thin.

The side entering type LED light source is spot light, and for spot light being become line source and area source, side entrance back need to be used LGP.Fig. 1 is prior art side entering-type LED backlight module exploded view, and Fig. 2 is the partial top view of Fig. 1, and this side light source LED-backlit module comprises backboard 10, one LED lamp bar light source 20, one LGPs 40, is provided with incidence surface and exiting surface, and the incidence surface side is provided with LED light source; One reflector plate 30 is positioned at the below of described LGP; Some blooming pieces 50 are positioned at the top of described LGP 40; And one glue frame 70 with its assembling.As shown in Figure 2, in side light source LED-backlit module when design,, the size of blooming piece is usually little than LGP, and the size of LGP is usually little than reflector plate, and the size dimension of optics section material is designed to: blooming piece＜LGP＜reflector plate.

In side light source LED-backlit module, as shown in Figure 3 the light path schematic diagram of light inlet side of part sectioned view.The light source 20 that light emitting diode sends penetrates LGP 40(LGP) incidence surface transmit light source to LGP, light source forms area source, and then provides liquid crystal panel required light source by the conduct direction of light guide plate mesh point converted light source.Be reflected back in LGP and be arranged at the light that the reflector plate 30 below LGP spills bottom surface of light guide plate, prevent that light source from leaking outside, to increase the service efficiency of light.For the design of side light source LED-backlit module, if when the distance between LED (Pitch) is excessive, the reverberation at place, LED lamp source is many, and distance L ED lamp source reverberation relatively at a distance is fewer, just causes occurring between LED the dark space.Produce the optics grade bad phenomenon (being Hot Spot phenomenon) of LGP incidence surface light and shade inequality; Although can improve the problems referred to above by the distance of dwindling the distance between LED or increase between LED and LGP, but when can therefore increasing by dwindling distance between LED LED the number that backlight module uses can improve the problems referred to above the time, cause the cost of backlight module to improve; When the distance between increase LED and LGP also can be improved the problems referred to above, also cause the reduction of LED light source utilization rate simultaneously; In addition, the blooming piece correspondence that increases LED number or replacing high price also can be improved the problems referred to above, but such scheme all can cause the backlight module cost to increase.

Summary of the invention

Goal of the invention: in order solving in prior art in the design of side light source LED-backlit module, when the distance between LED (Pitch) is excessive, produces between the LED lamp and the dark space occurs, and then cause the optics grade bad phenomenon of LGP incidence surface light and shade inequality.

Technical scheme: in order to achieve the above object, the invention provides a kind of side light source LED-backlit module, comprise that a LGP is provided with incidence surface and exiting surface; The incidence surface side is provided with LED light source; One reflector plate is positioned at the below of described LGP; Form a plurality of breach of the preset distance that is spaced apart from each other to reduce the reflecting brightness at light source place on reflector plate one side.

Further, the width of described each breach is less than the width of the light-emitting area of LED lamp;

Further, the degree of depth of described each breach is greater than the height of LED lamp;

Further, described each breach is square, triangle, semicircle or oval breach;

Further, described each breach is arranged on LED lamp place corresponding to described reflector plate.

Beneficial effect: by a plurality of square breach of the preset distance that is spaced apart from each other is set on a side of the corresponding LED lamp of reflector plate, the breach that reaches on reflector plate coordinates in correspondence with each other with the light source led lamp of backlight module.Can make the reverberation minimizing of the corresponding LED light source of reflector plate placement, and then when the distance between LED (Pitch) is excessive, avoid occurring between LED the dark space, effectively improve the optical anomaly phenomenon of LGP incidence surface light and shade inequality.

Description of drawings

Fig. 1 is prior art side entering-type LED backlight module exploded view;

Fig. 2 is prior art side entering-type LED backlight module partial top view;

Fig. 3 is the part sectioned view of prior art and the light path signal of light inlet side;

Fig. 4 is side light source LED-backlit module partial top view of the present invention;

Fig. 5 is reflector plate in Fig. 4 and the partial top view of LED lamp source;

Fig. 6 is that the breach that arranges on reflector plate of the present invention is the partial top view of vee;

Fig. 7 is the partial top view of the breach half round cut that arranges on reflector plate of the present invention;

In figure 10, backboard, 20, the LED lamp, 30, reflector plate, 40, LGP, 50, blooming piece, 70, the glue frame, 301, breach.

The specific embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.

Be illustrated in figure 4 as a kind of side light source LED-backlit module partial top view of this programme, this module comprises: a backboard 10, the LED lamp bar light source that a plurality of LED lamps 20 that are arranged on backboard 10 and are separated from each other form, one LGP 40, be provided with incidence surface and exiting surface, the corresponding LED lamp of incidence surface side bar light source; One reflector plate 30 is positioned at the below of described LGP 40; Some blooming pieces 50 are positioned at the top of described LGP 40.In order to improve when the distance between LED (Pitch) is excessive, will cause occurring between LED the dark space, produce the optics grade bad phenomenon (being Hot Spot phenomenon) of LGP incidence surface light and shade inequality.The edge contour place that this programme has changed the corresponding LED lamp of reflector plate 30 bar light source one side is a smooth linear structure.This programme forms a plurality of breach of the preset distance that is spaced apart from each other to reduce the reflecting brightness at light source place on a side of the corresponding LED lamp of reflector plate 30 bar light source, improve optics grade bad phenomenon, simultaneously topical product reliability and service life.

The partial top view in reflector plate as shown in Figure 5 and LED lamp bar source form a plurality of square breach 301 of the preset distance that is spaced apart from each other on a side of 20 light sources of the corresponding LED lamp of reflector plate 30, and square breach is square being projected as of backboard.And square breach 301 is arranged on LED lamp 20 places.A plurality of square breach 301 are corresponding one by one with a plurality of LED lamps 20.In order to make the optics utilization rate the highest, square breach 301 width are less than the light-emitting area width of LED lamp 20, and namely square breach 301 is at the width W of the projection on the backboard width ω less than light-emitting area projection on backboard of LED lamp 20; And the degree of depth of square breach 301 is greater than the height of LED lamp 20, i.e. the depth H of square breach 301 projection on backboard is greater than the height of LED lamp 20.By shown in Figure 5, breach 301 on reflector plate coordinates in correspondence with each other with the light source led lamp 20 of backlight module, can make the reverberation minimizing of the corresponding LED light source of reflector plate placement, when the distance between LED (Pitch) is excessive, avoid Duoing and causing occurring between the LED lamp phenomenon of dark space than the reverberation away from LED lamp source place at the reverberation of LED lamp source placement, and then effectively improved the optical anomaly phenomenon of LGP incidence surface light and shade inequality.

A plurality of square breach of the corresponding LED lamp of the reflector plate of the present embodiment bar light source one side setting also can be set as vee, semicircle breach, half elliptic breach.Also can reach effective optical anomaly phenomenon of improving LGP incidence surface light and shade inequality.

Be illustrated in figure 6 as the part section schematic top plan view that also can form a plurality of vees of the preset distance that is spaced apart from each other in a side of the corresponding LED lamp of reflector plate 30 bar light source.A plurality of vees 301 are corresponding one by one with a plurality of LED lamps 20.In order to make the optics utilization rate the highest, vee 301 width are less than the light-emitting area width of LED lamp 20, and namely vee 301 is at the length W on the projection gained leg-of-mutton base on the backboard width ω less than the projection of light-emitting area on backboard of LED lamp 20; And the degree of depth of vee 301 is greater than the height of LED lamp 20, and namely the leg-of-mutton height H of vee 301 projection gained on backboard is greater than the height of LED lamp 20.

Be illustrated in figure 7 as a plurality of semicircle breach that forms the preset distance that is spaced apart from each other in a side of the corresponding LED lamp of reflector plate 30 bar light source, a plurality of semicircle breach 301 are corresponding one by one with a plurality of LED lamps 20.In order to make the optics utilization rate the highest, the width of semicircle breach 301 is less than the light-emitting area width of LED lamp 20, and namely semicircle breach 301 is at the semicircular diameter W of the projection gained on the backboard width ω less than the projection of light-emitting area on backboard of LED lamp 20; And the degree of depth of semicircle breach 301 is greater than the height of LED lamp 20, i.e. the semicircular radius of the projection of semicircle breach 301 on backboard is greater than the height h of LED lamp 20.

In like manner, also can form a plurality of half elliptic breach of the preset distance that is spaced apart from each other in a side of the corresponding LED lamp of reflector plate 30 bar light source, and a plurality of semicircle breach is corresponding one by one with a plurality of LED lamps 20.In order to make the optics utilization rate the highest, set the width of half elliptic breach less than the light-emitting area width of LED lamp 20; The degree of depth of half elliptic breach is greater than the height of LED lamp 20; Can reach identical purpose.

By the enforcement to this programme, not only effectively improve the optical anomaly phenomenon of LGP incidence surface light and shade inequality, and then reduce the cost of backlight module, and have good production reliability and reliability.

Claims

1. a side light source LED-backlit module, comprise that a LGP is provided with incidence surface and exiting surface; The incidence surface side is provided with LED light source; One reflector plate is positioned at the below of described LGP; It is characterized in that: form a plurality of breach of the preset distance that is spaced apart from each other to reduce the reflecting brightness at light source place on reflector plate one side.

2. a kind of side light source LED-backlit module according to claim 1, it is characterized in that: the width of described each breach is less than the width of the light-emitting area of LED lamp.

3. a kind of side light source LED-backlit module according to claim 1, it is characterized in that: the degree of depth of described each breach is greater than the height of LED lamp.

4. a kind of side light source LED-backlit module according to claim 1 is characterized in that: described each breach is square, triangle, semicircle or oval breach.

5. a kind of side light source LED-backlit module according to claim 1 is characterized in that: described each breach is arranged on LED lamp place corresponding to described reflector plate.