CN1441286A - Backlight module and liquid crystal display - Google Patents

Abstract

The present invention discloses a backlight module for a liquid crystal display, which includes a plurality of lamp tubes located above a reflector, each lamp tube includes two ends, each end includes an electrode, and the voltage required by each lamp tube is provided by at least one circuit board arranged on the side of the reflector, and the electrode is directly electrically connected to the circuit board. The present invention can reduce the size of the backlight module, and can reduce materials and manufacturing procedures to reduce the manufacturing cost.

Description

Backlight module and liquid crystal display

technical field

The present invention mainly relates to a backlight module used for liquid crystal display, in particular, the invention relates to a connection design between a lamp tube and a circuit board of the backlight module.

Background technique

A typical liquid crystal display mainly includes a liquid crystal panel. Since the liquid crystal panel itself cannot emit light, a backlight module is required to provide sufficient incident light for the liquid crystal panel. Among them, the design of the backlight module is gradually striving towards the direction of small size and low price in response to the needs of consumers.

At present, there are many types of backlight modules used in liquid crystal displays in the industry. Among them, the direct-type backlight module 1 is shown in FIG. Used to provide liquid crystal panel light source. Each end of each lamp tube 11 is respectively connected to a wire 113 via an electrode 111, and each wire 113 located at both ends of the same lamp tube 11 is jointly connected to a joint 114, and the joint 114 is further connected to a circuit board 12 to provide a lamp. The tube 11 is connected to a power supply output terminal 121 of the required voltage for emitting light. In addition, in order to protect the electrodes 111, the industry usually wraps the electrodes 111 with a sleeve 112 made of insulating material, which can isolate the electrodes 111 with high voltage flow and allow the wires 113 to protrude outward. .

This existing backlight module 1 has the shortcoming that the size is too large, because the circuit board 12 is placed flatly in the backlight module, and each lamp tube 11 is connected with the circuit board 12 by each wire 113 and the joint 114, so the liquid crystal display is used for In addition to a display area for displaying information, it is also necessary to reserve space in the non-display area to accommodate the circuit boards 12, wires 113 and joints 114, so that the size cannot be reduced; in addition, in the manufacturing process, each lamp tube 11 The electrode 111 of the electrode 111 needs to be connected to the wire 113 first, and then the wire 113 located at both ends of the same lamp tube 11 is connected to the connector 114 before the connector 114 can be connected to the circuit board 12. Poor contact may occur at these complicated connections. However, defective products are formed, and each of the lamp tubes 11 is connected to the power output end 121 by a separate joint 114, which is not conducive to the control of material and manufacturing costs.

In view of this, the present invention is committed to developing a novel and progressive backlight module, in order to achieve the purpose of reducing the size and cost of the liquid crystal display.

Contents of the invention

The object of the present invention is to provide a backlight module for a liquid crystal display, which includes a plurality of lamp tubes, each of the two ends of each lamp tube includes an electrode and is electrically connected with each electrode to provide the voltage required by each lamp tube. At least one circuit board, each electrode is adjacent to the circuit board. The invention can reduce the size of the backlight module, and can reduce the material and manufacturing process to reduce the manufacturing cost.

Description of drawings

FIG. 1 is a partial perspective view of a backlight module in the prior art;

Fig. 2a is a partial perspective view of Embodiment 1 of the backlight module of the present invention;

Figure 2b is a schematic plan view of Figure 2a;

FIG. 3a is a partial perspective view of Embodiment 2 of the backlight module of the present invention;

Fig. 3b is a schematic plan view of Fig. 3a.

Detailed ways

Embodiment one

The backlight module 2 shown in Fig. 2a and 2b, it comprises a plurality of U-shaped lamp tubes 21, and a reflective plate 23 placed under each lamp tube 21 reflects its divergent light source to the liquid crystal panel; wherein each lamp tube 21 It includes two ends, and each end has an electrode 211 that can input power to each lamp tube 21, and each electrode 211 is further electrically connected to an electrode 211 that can provide the voltage required by each lamp tube 21 and is located on the side of the reflector 23. A circuit board 22; wherein the circuit board can utilize a single power supply terminal 221 and a circuit located on the circuit board 22 to distribute the output voltage of the power supply terminal 221 to each electrode 211; and the circuit board 22 is arranged perpendicular to the reflector 33, Each electrode 211 can be directly connected to the circuit board 22 . Preferably, the height of the circuit board is smaller than the overall thickness of the backlight module. In this embodiment, the backlight module further includes a backboard (not shown), and the circuit board 22 may further include a plurality of fixing components that can vertically fix the circuit board 22 on the backboard; The sleeve 212 of the electrodes 211 may also be applied to cover each electrode 211 .

The present invention uses the circuit board 22 perpendicular to the reflector 23 to directly electrically connect the electrodes 211 of the lamp tubes 21, but it can realize this electrical connection in any existing way, such as direct welding, or first connect through a wire After the electrodes 211 and the circuit board 22 are removed, the redundant wires are cut off. The present invention does not need wires to be connected to the joints, and does not need to provide power output terminals for each joint. It can not only greatly reduce the complicated connections in the prior art and reduce the chance of defective products due to poor connections, but also greatly reduce The steps of making. In addition, the present invention avoids setting redundant wires, connectors and power input ends, and is more competitive in cost control. The great progress of the present invention on the size of the liquid crystal display is that the backlight module only needs to reserve a very small space for setting the vertical circuit board in a non-display area, and does not increase the thickness of the backlight module, so the liquid crystal display of the present invention is more It has the advantage of small size.

Embodiment two

The backlight module 3 shown in Figure 3a and 3b is similar to the backlight module 2 of the first embodiment, including a plurality of straight lamp tubes 31 located on a reflector 33, wherein each lamp tube 31 includes two ends, and Each end is electrically connected to a first circuit board 32 and a second circuit board 34 on opposite sides of the reflector 33 with an electrode 311, wherein each circuit board 32 is arranged perpendicular to the reflector 33, and each electrode 311 can be directly connected to the circuit board 32 . In this embodiment, the first circuit board 32 includes a power supply terminal 321 that can provide the voltage of each lamp tube 31, and is electrically connected with the second circuit board 34 through wires (not shown), so that the voltage can be further distributed. To each lamp tube 31.

In the present invention, the connection mode between the circuit board and the lamp tube electrodes, and the arrangement and design of the printed circuit and the power input terminal in the circuit board can be completed by those skilled in the art with specific circuit knowledge. In addition, other components added to achieve other additional functions, such as fixing components or sleeves, can also be provided in the backlight module of the present invention as required.

The present invention is applicable to various types of direct-lit backlight modules, and the number and types of lamp tubes and circuit design and configuration of circuit boards are not limited to the above examples. It is the protection scope of the present invention to have a plurality of lamp tubes directly electrically connected to at least one circuit board, so that a plurality of electrodes of the lamp tubes are adjacent to the circuit board disposed on the backlight module of the liquid crystal display.

The above-mentioned embodiments are only to illustrate the principles and functions of the present invention, but not to limit the present invention. Therefore, modifications and changes made to the above-mentioned embodiments by those skilled in the art still do not violate the spirit of the present invention.

Claims (9)

1. A backlight module for a liquid crystal display, comprising a reflector; A plurality of lamp tubes are arranged above the reflecting plate, each lamp tube includes two ends, and each end includes an electrode; and At least one circuit board providing voltage required by each lamp tube is arranged on the side of the reflector, and each electrode is directly electrically connected to the circuit board. 2. The backlight module according to claim 1, characterized in that it comprises a circuit board, and each lamp tube is a U-shaped lamp tube, and two ends of each electrode are connected to the circuit board. 3. The backlight module according to claim 1, characterized in that: it includes two circuit boards, which are respectively arranged on two opposite sides of the reflector, wherein the light tubes are straight light tubes, and the two ends of each light tube are respectively connected to the two circuit boards. 4. The backlight module according to claim 1, further comprising a plurality of sleeves made of insulating material, each sleeve covering each electrode. 5. The backlight module as claimed in claim 1, wherein each circuit board includes at least one power supply terminal disposed thereon. 6. The backlight module according to claim 1, wherein the backlight module further comprises a backplane, and the circuit board further comprises a plurality of fixing components for fixing the circuit board on the bottom plate. 7. The backlight module according to claim 1, wherein the height of each circuit board is smaller than the thickness of the backlight module. 8. The backlight module according to claim 1, wherein each electrode is directly welded on each circuit board. 9. A liquid crystal display, characterized in that it comprises the backlight module as claimed in claim 1.

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