CN200944171Y

CN200944171Y - Backlight module using LED reflective depression

Info

Publication number: CN200944171Y
Application number: CN 200620120893
Authority: CN
Inventors: 宋义; 定毛山; 苏遵惠; 定伯元
Original assignee: Shenzhen Diguang Electronics Co Ltd
Current assignee: Shenzhen Diguang Electronics Co Ltd
Priority date: 2006-07-11
Filing date: 2006-07-11
Publication date: 2007-09-05
Anticipated expiration: 2016-07-11

Abstract

The utility model provides a backlight module of the reflect pit of the light emitting diode (LED). The backlight module comprises a circuit board used to fix the LED and the connecting wires. The circuit board is provided with a plurality of pits, a plurality of slices of the LED, a light propagation dissipation material, a diffuser plate, a light propagation scattering material. The circuit is provided with at least one hole on the peripheral thereof, as well as a shell. The pits on the circuit board forms a reflect cup, which reflects the lateral light of LED onto the light propagation scattering material. Therefore, the lateral light of the LED is educed with high efficiency. The light propagation material passes through the across hole to emit the energy produced by the backlight module.

Description

Use the module backlight of LED reflection pit

Technical field

The utility model provides a kind of module backlight of the LED of use reflection pit, is efficiently luminous, a simple in structure module backlight.

Background technology

Module backlight is the assembly that light source is provided to the LCD product, is one of its key component, has been widely used in all many-sides such as mobile phone, digital camera, video camera, computer display screen, flat-surface television, plane outdoor advertising at present.Module backlight is arranged at the below of display screen, with provide evenly disperse and the light of certain brightness to display screen, form the colour picture of different brightness, different color and different gray scales by the pixel electrode on the control display screen.And module backlight is divided into straight-down negative module (light source places under the display screen) and side-light type module (light source places the display screen side) according to the light source position.Because the light source of direct-light-type backlight module under display screen, therefore can satisfy the demand of higher brightness or large-size display screen.

Fig. 1 is known module cut-open view backlight.As shown in Figure 1, directly behind fixing on the PCB, lead-in wire, welding LED, with the transparent resin perfusion, this is the simplest module of using always backlight.The lateral emitting of LED can't reflex on the light guide plate, so the sidelight of LED is not fully utilized.This a part of light becomes heat energy because of not deriving, and the temperature of LED and the temperature of module are raise, and module backlight need increase heat abstractor.

Summary of the invention

The purpose of this utility model is to provide a kind of module backlight of the LED of use reflection pit, be in the down straight aphototropism mode set of led chip as light source, under the condition that does not increase cost, the side light of LED is applied more fully, the brightness of module backlight is improved.

To achieve these goals, the utility model provides a kind of module backlight of the LED of use reflection pit, and comprising: some LED provide light source; Circuit board, LED and line are fixed on the described circuit board; Several pits are arranged on the circuit board, and LED is placed in the pit, forms reflector; At least open a via hole that is used for discharging heat that module backlight produces at the LED periphery on the circuit board; The leaded light heat sink material is poured into LED and goes up sealing LED, by the heat of via hole discharging LED generation; Light guide plate places between leaded light heat sink material and the diffuser plate, and the light scattering that LED is produced is to diffuser plate; Diffuser plate places on the light guide plate, and the light scattering that LED produces is exported.

Further preferred version of the present utility model is that this module backlight also includes shell, places with the upper module outside, and is coated with upper module, and circuit board, diffuser plate, light guide plate and leaded light scattering material are fixed.

Further preferred version of the present utility model is that the material of described shell is a metal.

Above-mentioned and additional features, advantage of the present utility model can further be understood by the detailed description below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is the LED-backlit module sectional view of no reflection events device;

Fig. 2 is a LED-backlit module sectional view of the present utility model

Fig. 3 is local one of two views that amplify of the present utility model;

Fig. 4 is local two of two views that amplify of the present utility model.

Description of reference numerals: circuit board 10; Pit 11; Via hole 12; LED 20; Leaded light heat sink material 30; Light guide plate 40; Diffuser plate 50; Shell 60.

Embodiment

With reference to Fig. 2, be the sectional view of first embodiment of the present utility model.As shown in Figure 2, use the module backlight of LED to comprise several light emitting diodes (LED) 20; One is used for fixing the circuit board 10 that LED and line are used, pit 11 with LED 20 equal numbers (or counting on the same group mutually) is arranged on circuit board, at each pit internal fixation a slice (or one group) LED 20, has a via hole 12 near each LED 20 at least, perfusion leaded light heat sink material 30 on LED, with LED 20 sealing, and will be in the via hole 12 perfusion leaded light heat sink material 30, be communicated with shell 60 and be beneficial to heat radiation.Light guide plate 40 and diffuser plate 50 place leaded light heat sink material 30 upper ends, are fixed on the shell 60.Leaded light heat sink material 30 is poured into sealing LED 20 on the LED 20, by the heat of via hole 12 discharging LED 20 generations; Light guide plate 40 places between leaded light heat sink material 30 and the diffuser plate 50, with LED

20 light scattering that produce are to diffuser plate 50; Diffuser plate 50 places on the light guide plate 40, and the light scattering that LED 20 produces is exported.Shell 60 places with the upper module outside, and is coated with upper module, and circuit board 10, diffuser plate 50, light guide plate 40 and leaded light scattering material 30 is fixing.

Generally speaking, the corresponding a slice LED of each pit, in the most preferred embodiment of first embodiment of the present utility model, each pit is placed a slice LED.In another embodiment, when each pit is placed red (R), green (G), blue (B) one group of LED, pit diameter is answered corresponding expansion, and the angle of frustum cone side and bottom surface changes to some extent, and the position of the thickness of perfusion leaded light heat sink material and leaded light scattering material, diffuser plate is all identical with requirement.

Consult Fig. 3, Fig. 4 and amplify two views, via hole 12 can with the perpendicular direction of the pad of LED 20, according to the size in line gap, open 1 hole or a plurality of hole, in order to the discharge of heat.

Pit 11 is the reverse frustoconic pit, and no matter the size of LCDs is much, all can one-shot forming when printed circuit board (PCB) is produced, and via hole 12 also can once be finished when printed circuit board (PCB) is produced.When the angle of the circular diameter up and down of pit 11 and side and lower plane during in certain limit, several reflectors promptly on circuit board, have been formed naturally, a slice led chip can be put in each reflector bottom, also can put one group of led chip, the reflective cup reflects of the side light of led chip by on circuit board is to light guide plate 40 and diffuser plate 50.Its sidelight is utilized fully.The heat that led chip produces then dispels the heat to the external world by leaded light heat sink material 30 and via hole 12, or will pour into leaded light heat sink material 30 in the via hole 12, is communicated with shell to be beneficial to heat radiation.

Be to be understood that, below explanation in conjunction with the embodiments is for the utility model illustrative and nonrestrictive just, in not breaking away from spirit and scope of the present utility model, can make many changes and modification to the utility model, it all will drop in the scope of the present utility model defined by the claims.

Claims

1. a module backlight that uses LED reflection pit is characterized in that, comprising:

Some LED provide light source;

Circuit board, LED and line are fixed on the described circuit board;

Several pits are arranged on the circuit board, and LED is placed in the pit, forms reflector;

At least open a via hole that is used for discharging heat that module backlight produces at the LED periphery on the circuit board;

The leaded light heat sink material is poured into LED and goes up sealing LED, by the heat of via hole discharging LED generation;

Light guide plate places between leaded light heat sink material and the diffuser plate, and the light scattering that LED is produced is to diffuser plate;

Diffuser plate places on the light guide plate, and the light scattering that LED produces is exported.

2. the module backlight of use LED reflection pit as claimed in claim 1, it is characterized in that: this module backlight also includes shell, places with the upper module outside, and is coated with upper module, and circuit board, diffuser plate, light guide plate and leaded light scattering material are fixed.

3. the module backlight of use LED reflection pit as claimed in claim 2, it is characterized in that: the material of described shell is a metal.