CN202484733U

CN202484733U - Direct-type single LED (light-emitting diode) backlight module

Info

Publication number: CN202484733U
Application number: CN2011205386522U
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: 2011-12-21
Filing date: 2011-12-21
Publication date: 2012-10-10
Anticipated expiration: 2021-12-21

Abstract

The utility model discloses a direct-type single-LED (light-emitting diode) backlight module, which comprises a light source module. The light source module comprises a cone-shaped luminous cavity cover and an LED circuit board provided with an LED, and the LED circuit board is fixed at the bottom of the cone-shaped luminous cavity cover. The direct-type single-LED backlight module is additionally provided with the light source module (comprising the cone-shaped luminous cavity cover and the LED circuit board with the single LED) to replace the existing LED circuit board with a plurality of LEDs and the existing metal back plate, thereby reducing the cost. The inner wall of the cone-shaped luminous cavity cover is provided with a reflective layer which is used for improving light utilization ratio of the single LED, thereby reducing the number of the LEDs of the backlight module (namely allowing the direct-type single LED backlight module to be provided with only one LED) and the cost. The direct-type single-LED backlight module has good product reliability and trustworthiness.

Description

The single LED-backlit module of straight-down negative

Technical field

The utility model relates to a kind of module backlight, particularly a kind of down straight aphototropism mode set.

Background technology

Traditional direct-light type LED backlight module comprises usually: glue frame, optical diaphragm group, diffuser plate, backboard and led circuit plate; Wherein the led circuit plate is made up of light emitting diode (LED) and printed circuit board (PCB).Fig. 1 is the decomposing schematic representation of traditional direct-light type LED backlight module, and the LED-backlit module is by the light source that light emitting diode sent on the led circuit plate, and then provides liquid crystal panel required light source.Tradition direct-light type LED backlight module when excessive as if the distance (Pitch) between the LED, will cause occurring between the LED dark space, and the exiting surface of diffuser plate will produce the optics grade bad phenomenon of light and shade inequality; Though the distance of dwindling between the LED can be improved above-mentioned bad phenomenon, therefore the employed LED of direct-light type LED backlight module number can increase, and causes the cost of direct-light type LED backlight module to improve.

The utility model content

The utility model purpose: to the problem and shortage of above-mentioned existing existence, the purpose of the utility model provides the single LED-backlit module of a kind of straight-down negative that reduces cost.

Technical scheme: for realizing above-mentioned utility model purpose; The technical scheme that the utility model adopts is the single LED-backlit module of a kind of straight-down negative; Comprise a light source module; Said light source module comprises taper lighting cavity cover and the led circuit plate that is provided with a LEDs, and said led circuit plate is fixed in the bottom of taper lighting cavity cover.

The profile of said taper lighting cavity cover can be circular cone or pyramid or other form taper.

The inwall of said taper lighting cavity cover can be provided with the reflecting layer; The reflecting layer material (for example: SiO2/TiO2) or attach reflector plate and realize can be ink printing; Reflectivity is generally 95% to 98%; In order to improve the light utilization efficiency of LED, the LED that can reduce module backlight uses a number (the utility model only needs a LEDs) and cost.

Said led circuit plate can be fixed in the bottom of taper lighting cavity cover through adhesive tape.

The sidewall of said taper lighting cavity cover and the angle of horizontal plane have three kinds at least.

The sidewall of said taper lighting cavity cover and the angle of horizontal plane have three kinds; And from the bottom up; The angle of first section said sidewall and horizontal plane is 160 degree, and the angle of second section said sidewall and horizontal plane is less than 160 degree, and the angle of the 3rd section said sidewall and horizontal plane is spent greater than 160.

Beneficial effect: the newly-increased light source module of the utility model (taper lighting cavity cover and the led circuit plate that is provided with single LED); Replace the existing led circuit plate of plurality of LEDs and the backboard of metal material of being provided with; (cost of reduction is relevant with the size of liquid crystal panel, and size is big more, and the cost of reduction is many more to have reduced cost; With 31.5 inches liquid crystal panels is example, and the required LED quantity of the utility model has saved about 97.5% to 99.1% than prior art); The inwall of taper lighting cavity cover is provided with the reflecting layer, and in order to improve the light utilization efficiency of single LED, the LED that can reduce module backlight uses a number (the utility model only needs a LEDs) and cost, and has good production reliability and reliability.

Description of drawings

Fig. 1 is the decomposing schematic representation of traditional direct-light type LED backlight module;

Fig. 2 is the assembling sketch map of light source module;

Fig. 3 is the structural representation of light source module;

Fig. 4 is the decomposing schematic representation of the direct-light type LED backlight module of embodiment 1;

Fig. 5 is the structural representation of the direct-light type LED backlight module of embodiment 1;

Fig. 6 is the A-A cross-sectional schematic of Fig. 5;

Fig. 7 is the B-B cross-sectional schematic of Fig. 5;

Fig. 8 is the taper lighting cavity cover contour structures sketch map of embodiment 2;

Fig. 9 is the cross-sectional schematic of Fig. 8;

Figure 10 is the cross-sectional schematic of the direct-light type LED backlight module of embodiment 2.

The specific embodiment

Below in conjunction with accompanying drawing and specific embodiment; Further illustrate the utility model; Should understand these embodiment only be used to the utility model is described and be not used in the restriction the utility model scope; After having read the utility model, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the utility model.

Embodiment 1:

As shown in Figure 2; The led circuit plate that is provided with single LED is assembled in the taper lighting cavity cover from top to bottom; Just form a light source module; Wherein the led circuit plate comprises printed circuit board (PCB) and is fixed in the LEDs on this printed circuit board (PCB), and fixing (certain, as also can to lock or other engaging mode is fixed through screw) pasted through the adhesive tape (not shown) in the bottom of the bottom of led circuit plate and taper lighting cavity cover.This taper lighting cavity cover external form is a pyramid, also can be circular cone or other form tapers certainly; This taper lighting cavity cover inwall forms the reflecting layer through ink printing silica, improves the light utilization efficiency of single LED; The sidewall of this taper lighting cavity cover and the angle of horizontal plane and the lighting angle of LED adapt, and are generally 110 degree to 170 degree, consider cost factor, preferred 160 degree of present embodiment.Light source module after the assembling is as shown in Figure 3.

As shown in Figure 4, the direct-light type LED backlight module of present embodiment comprises with lower component: glue frame, optical diaphragm group, diffuser plate and a light source module, wherein optical diaphragm group comprises 2 blooming pieces.Direct-light type LED backlight module after the above component-assembled is as shown in Figure 5, because the glue frame has blocked optical diaphragm group and diffuser plate, so should scheme not shown.Light source module in the present embodiment has replaced the led circuit plate that is provided with plurality of LEDs and the backboard of metal material in traditional direct-light type LED backlight module, has reduced cost.

Fig. 6 and Fig. 7 are respectively A-A cross-sectional schematic and the B-B cross-sectional schematic of Fig. 5; Arrow among the figure shows the direction of propagation of the light that LED launches; Can find out that the angle of sidewall and the horizontal plane of taper lighting cavity cover equals the lighting angle of LED; Do not cover so the light that LED is launched can not receive the sidewall of taper lighting cavity cover, after the light that LED launched is passed through fixed range, can provide liquid crystal panel required whole area source.

Embodiment 2:

As shown in Figure 8, the difference of present embodiment and embodiment 1 is: the angle of taper lighting cavity hood side and horizontal plane is not the angle of embodiment 1, but three different angles are arranged.As shown in Figure 9; The sidewall in taper lighting cavity cover L4 zone and the angle of horizontal plane are 160 degree, and the sidewall in taper lighting cavity cover L3 zone and the angle of horizontal plane are that 150 degree (are not limited to 150 degree, as long as less than 160 degree; And being not less than 110 degree gets final product); The sidewall in taper lighting cavity cover L2 zone and the angle of horizontal plane be 170 degree (be not limited to 170 degree, as long as greater than 160 degree, and be not more than 170 spend get final product).The sidewall of taper lighting cavity cover is not to have three different angles with the angle of horizontal direction, and its angle also can be more than 3.

Shown in figure 10; Arrow among the figure shows the direction of propagation of the light that LED launches; The angle of sides in taper lighting cavity cover L4 zone and the angle of horizontal plane equal lighting angle 160 degree of LED, so the light that LED launched can not covered by the sidewall in taper lighting cavity cover L4 zone; When light arrived the sidewall in taper lighting cavity cover L3 zone, the reflecting layer of sidewall surfaces changed direction of light, and the lighting angle of LED is increased; When light arrives the sidewall in taper lighting cavity cover L2 zone, spend greater than the lighting angle 160 of LED because of the angle of this region side walls and horizontal direction, so light can not covered by this regional sidewall, can provide liquid crystal panel required whole area source.Present embodiment taper lighting cavity hood side height less than embodiment 1 under the situation of taper lighting cavity hood side height, realized identical effect (promptly providing liquid crystal panel required whole area source), further reduced cost.

Claims

1. the single LED-backlit module of straight-down negative comprises a light source module, and said light source module comprises taper lighting cavity cover and the led circuit plate that is provided with a LEDs, and said led circuit plate is fixed in the bottom of taper lighting cavity cover.

2. according to the single LED-backlit module of the said straight-down negative of claim 1, it is characterized in that: the profile of said taper lighting cavity cover is circular cone or pyramid.

3. according to the single LED-backlit module of the said straight-down negative of claim 1, it is characterized in that: the inwall of said taper lighting cavity cover is provided with the reflecting layer.

4. according to the single LED-backlit module of the said straight-down negative of claim 1, it is characterized in that: said led circuit plate is fixed in the bottom of taper lighting cavity cover through adhesive tape.

5. according to the single LED-backlit module of the said straight-down negative of claim 1, it is characterized in that: the sidewall of said taper lighting cavity cover and the angle of horizontal plane are that 110 degree are to 170 degree.

6. according to the single LED-backlit module of the said straight-down negative of claim 1, it is characterized in that: the sidewall of said taper lighting cavity cover and the angle of horizontal plane are 160 degree.

7. according to the single LED-backlit module of the said straight-down negative of claim 1, it is characterized in that: the sidewall of said taper lighting cavity cover and the angle of horizontal plane have three kinds at least.

8. according to the single LED-backlit module of the said straight-down negative of claim 1; It is characterized in that: the sidewall of said taper lighting cavity cover and the angle of horizontal plane have three kinds; And from the bottom up; The angle of first section said sidewall and horizontal plane is 160 degree, and the angle of second section said sidewall and horizontal plane is less than 160 degree, and the angle of the 3rd section said sidewall and horizontal plane is spent greater than 160.