CN100365486C - Backlight module - Google Patents

Abstract

The invention discloses a backlight module which comprises a light emitting diode circuit board, light emitting diodes and a driving circuit board. The light emitting diode circuit board is provided with a first surface and a second surface, and the second surface is provided with a first connecting head. The light emitting diode is electrically connected with the first connector. The surface of the driving circuit board is provided with a second connector which can be combined with the first connector. The driving circuit board is directly assembled with the light-emitting diode circuit board through the mutual embedding of the first connector and the second connector so as to drive the light-emitting diodes on the light-emitting diode circuit board. The invention avoids using connecting wires, thereby avoiding the trouble of wire arrangement, simultaneously increasing the available space in the backlight module, and greatly improving the flexibility of design besides simpler design for designers.

Description

Backlight module

technical field

The invention relates to a backlight module, in particular to a backlight module which can be assembled conveniently.

Background technique

Nowadays, liquid crystal display has been widely used in various information display devices. Its main structure can be divided into two parts: liquid crystal panel and backlight module. The liquid crystal panel roughly includes ITO conductive glass substrate, liquid crystal layer, alignment film, color filter plate, polarizer and other components; the backlight module mainly includes a light source, light guide plate, prism sheet, diffuser plate, reflector sheet and various optical films, and provides light source to the LCD panel through the backlight module to achieve the purpose of information display. The overall characterization of an LCD product is affected by the interaction of all internal components, with the backlight module playing an important role in screen brightness, uniformity, contrast and viewing angle.

In the backlight module, currently used light sources include Cold Cathode Fluorescent Lamp (CCFL), External Electrode Fluorescent Lamp (EEFL) or Light Emitted Diode (LED). Among them, the light-emitting diode is a light-emitting component made of semiconductor materials. The component has two electrode terminals, and a voltage is applied between the terminals, and the energy is excited and released in the form of light through the combination of electron holes. Light-emitting diodes have the advantages of small size, long life, low driving voltage, low power consumption and good shock resistance, so they are getting more and more attention.

In addition, in the backlight module, there is usually a driving circuit board, which is used to control the power supply of the light source therein. Because the driving circuit board will generate high temperature, in order to reduce the impact of the driving circuit board on the liquid crystal display, the driving circuit board is usually arranged on the back of the backlight module, and the driving circuit board and the light source in the backlight module need to be connected through various connection lines.

However, in practice, in addition to complicated wiring and difficult assembly, the method of connecting using connecting wires often has the problem of wire management that the connecting wires are not easy to fix and the connecting wires are easy to tangle.

What's more, due to the large variety of LED bulbs or LED modules currently provided by LED suppliers, the design of the application of LEDs in the backlight module is relatively complicated. When designers use these various types of LED modules, they also need to consider their respective wiring methods, which makes the design more complicated. In addition, different ways of fixing the connecting wires also increase the difficulty of assembly.

Therefore, how to effectively solve the aforesaid cable management problem and at the same time improve the assembly efficiency of the liquid crystal display is the direction of efforts of those skilled in the art.

Contents of the invention

Accordingly, the technical problem to be solved by the present invention is to provide a backlight module, which can avoid the trouble of cable management, and for the designer, besides making the design easier, the flexibility of the design can be greatly improved. The backlight module provided by the present invention includes a light emitting diode circuit board, a light emitting diode and a driving circuit board.

The LED circuit board has a first surface and a second surface, and a first connector (Connector) is arranged on the second surface.

The light emitting diode is embedded in the light emitting diode circuit board, which is electrically connected with the first connecting head.

The driving circuit board has a second connector which can be combined with the first connector.

Wherein, the first connecting head and the second connecting head are concave-convex matched with each other, that is, if one connecting head is a convex end, the other connecting head is a concave end, and the two are fitted together.

By means of the mutual fitting of the first connector and the second connector, the driving circuit board can be electrically connected with the LED circuit board to drive the circuit board to drive the LEDs on the LED circuit board. In this way, there is no need to use connecting wires, thus avoiding the trouble of wire management, and it can also increase the available space in the backlight module. For designers, not only the design is more convenient, but also the design flexibility is greatly improved. .

Description of drawings

In order to further illustrate the advantages and concepts of the present invention, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

Figure 1A is a cross-sectional view of a preferred embodiment of the present invention;

Figure 1B is an exploded perspective view of the main components of a preferred embodiment of the present invention;

2 to 4 are schematic diagrams of different implementations in which light emitting diodes are embedded in light emitting diode circuit boards in the present invention.

Explanation of reference signs

1 backlight module 111 first surface

10 backplane 112 second surface

11 Light-emitting diode circuit board 113 The first connector

12 light-emitting diodes 121 base

13 drive circuit board 122 light-emitting terminal

14 frame 131 second connector

101 through hole 15 thermal conductive film

Detailed ways

Please refer to FIG. 1A , which is a schematic side view of a preferred embodiment of the backlight module disclosed in the present invention. FIG. 1B is an exploded schematic view of the main components in FIG. 1A . In this embodiment, the backlight module 1 includes a backplane 10 , an LED circuit board 11 , an LED 12 and a driving circuit board 13 .

The back bezel 10 (back bezel) can be made of aluminum, plastic or various materials, and its periphery has side walls, and forms a shallow groove-like accommodation space. In general, the backlight module also has a frame (frame) 14, which can be assembled with the backplane 10, and can accommodate such as LED circuit board 11, LED 12, or other optical components (such as diffusion plate, reflector) placed in it. In addition, in this embodiment, the backplane 10 also has a through hole 101 passing through the backplane.

The light-emitting diode circuit board 11 can be various substrates (such as printed circuit boards) with circuit wiring, which has a first surface 111 and a second surface 112 facing the first surface, and on the second surface 112 is also provided with The first connector 113. More specifically, the second surface 112 of the LED circuit board 11 is a wiring surface on which wires are distributed, and the first connector 113 can be a plug or a socket. In this embodiment, it is an insertable socket, which is directly welded on the second surface 112 of the LED circuit board 11 .

The light-emitting diode circuit board 11 is arranged on the backboard 10 (that is, in the accommodating space formed by the backboard 10 and the frame 14), and its second surface 112 faces the backboard 10, and the first connector 113 connects from the backboard 10 through the Holes 101 pass through.

The LED 12 is embedded in the LED circuit board 11 and electrically connected to the first connector 113 . Furthermore, the LED 12 can be divided into a base 121 and a light emitting end 122 . The electrode pins of the base 121 can be soldered on the first surface 111 or the second surface 112 of the LED circuit board 11 to receive power. The electric signal received by the first connector 131 controls the light emitted from the light emitting end 122 .

If it is designed to weld the electrode pins of the base 121 on the second surface 112 , it is particularly suitable for use with the first connector 113 of the present invention.

Because, when the base 121 and the first connector 113 are separately arranged on the first surface 111 and the second surface 112 of the LED circuit board 11, the LED circuit board 11 needs to use a multilayer printed circuit board or a double-sided printed circuit board. board, and then connect the first surface 111 and the second surface 112 through via holes, which is relatively complicated. In other words, preferably, the base 121 and the first connector 113 are disposed on the same wiring surface. Therefore, in this embodiment, the base 121 is soldered on the second surface 112 of the LED circuit board 11 , and the first connector 113 is also disposed on the second surface 112 .

Furthermore, since the circuit in the base 121 is often the main heat source of the LED 12, when the base 121 is welded on the second surface 112 of the LED circuit board 11 so that the light-emitting end 122 is exposed outside the first surface, the base 121 and the light-emitting end 122 are located on two sides of the LED circuit board 11 respectively, so that the heat dissipated by the base 121 will not affect the overall light output efficiency of the backlight module. In a preferred situation, a heat conduction film 15 can also be provided between the backplane 10 and the LEDs 12 to guide the heat dissipated by the base 121 into the backplane 10 for dissipation.

Due to the above reasons, in the backlight module of the present invention, it is particularly suitable to weld the base 121 of the light emitting diode 12 on the second surface 112 .

It should be noted that the LEDs 12 can be embedded in the LED circuit board 11 in various ways, please refer to FIG. 2 , FIG. 3 and FIG. 4 together. Although one light emitting diode is taken as an example for illustration in these embodiments, in practice, multiple light emitting diodes may be installed in the backlight module, not limited to one light emitting diode.

As shown in FIG. 2 , the LED circuit board 11 may have a hole, and the LED 12 may be inserted into the hole.

As shown in FIG. 3 , the LED circuit board 11 may have a groove, and the LED 12 may be disposed in the groove.

Also as shown in FIG. 4 , the LED circuit board 11 may include two sub-circuit boards, and the LED 12 may be disposed between the two sub-circuit boards, that is, sandwiched by the two sub-circuit boards.

Please refer to FIG. 1A and FIG. 1B again. Wherein, the driving circuit board 13 is a circuit board provided with a power driving chip, which can be used to control the power supply to the LED 12 , that is, to activate the light source of the backlight module 1 . Moreover, a second connector 131 is provided on the surface of the driving circuit board 13 , and the second connector 131 and the first connector 113 are mutually concave-convex matched. For example, in this embodiment, the first connector 113 is a socket with a groove, and the second connector 131 is a protruding plug, which can be inserted into the first connector 113 .

It can be seen from the foregoing description that in the present invention, the LED circuit board and the driving circuit board are electrically connected by directly fitting the first connector and the second connector. It does not require the use of connecting wires, thereby solving the problem of tangled connecting wires. In addition, the designer does not need to consider the fixing method and routing arrangement of the connecting wires, thereby reducing the routing space required for the connecting wires and increasing the available space in the backlight module. The design is more convenient and convenient, and the flexibility of the design is also greatly improved.

Furthermore, when the backlight module of the present invention is assembled, the following steps can be followed:

Embed the light emitting diode 12 into the light emitting diode circuit board 11 in the aforementioned manner; after the first connector 113 of the light emitting diode circuit board 11 passes through the through hole 101 of the backplane, fix the light emitting diode circuit board 11 on the backplane 10; Position the driving circuit board 13 according to the position of the first connecting head 113 , so that the second connecting head 131 of the driving circuit board 13 can be inserted into the first connecting head 113 to electrically connect the driving circuit board 13 and the LED circuit board 11 .

It can be seen from the above steps that the assembly process of the backlight module of the present invention is very simple, and the assembly of the driving circuit board can be completed only by inserting the second connecting head of the driving circuit board according to the position of the first connecting head. In addition to the convenience of assembly, the first connector can also be used to display the corresponding position where the driving circuit board should be assembled on the backplane, thus having a positioning function at the same time.

In summary, compared with the prior art, the present invention has indeed made great progress. Apparently, those skilled in the art can better understand the concept of the present invention and its various advantages or functions after reading this description and the above implementations.

The present invention has been described in detail above only through a preferred embodiment. Obviously, this is not a limitation to the scope of the present invention. Those skilled in the art can understand that the present invention can be modified without departing from the concept and protection scope of the present invention. Make some modifications.

Claims (9)

1. backlight module comprises:

LED circuitboard, it has first surface and second surface, and described second surface is provided with first connector;

Light emitting diode, it is embedded on the described LED circuitboard, and electrically connects with described first connector;

Drive circuit board, it has second connector, and this second connector and described first connector are chimeric; With

Backboard with through hole, described LED circuitboard are set on the described backboard, and described first connector passes in the through hole of described backboard.

2. backlight module as claimed in claim 1, wherein, described LED circuitboard has hole, and described light emitting diode is embedded in this hole.

3. backlight module as claimed in claim 1, wherein, described LED circuitboard has groove, and described light emitting diode is set in this groove.

4. backlight module as claimed in claim 1, wherein, described LED circuitboard has two sub-circuit boards, and described light emitting diode is set between described two sub-circuit boards.

5. backlight module as claimed in claim 1, wherein, described light emitting diode is welded on the described LED circuitboard by the electrode leg of its base.

6. backlight module as claimed in claim 1, wherein, described first connector is a socket, and this socket is outwards outstanding from the second surface of described LED circuitboard, described second connector is a plug, and this plug is outwards outstanding from the surface of described drive circuit board.

7. backlight module as claimed in claim 5 comprises:

Described light emitting diode is welded on the described second surface of described LED circuitboard by the electrode leg of its base, and its luminous end is exposed to the described first surface outside; And

Described second connector and described first connector are chimeric, signal is transferred to described LED circuitboard.

8. backlight module as claimed in claim 1, wherein, described backlight module also has framework, and this framework and the combination of described backboard are with ccontaining described LED circuitboard and described light emitting diode.

9. backlight module as claimed in claim 1 wherein, is provided with heat conducting film between described backboard and the described light emitting diode.

Images