KR20030088646A - Back light assembly for liquid crystal display - Google Patents

Abstract

PURPOSE: A back light assembly for a liquid crystal display is provided to simplify an arrangement structure of return wires connected with lamps by using a printed circuit board. CONSTITUTION: A reflective plate(100) is provided. A plurality of lamps(210,220,230,240) are arranged on the reflective plate. A plurality of first connectors(310,320) are connected with first electrodes of the lamps respectively through first wires(212,222,234,244) for providing first power voltage to the first electrodes. A plurality of second connectors(410,420) are provided to receive second power voltage. A printed circuit board includes a third connector(530) connected with the second connectors for receiving the second power voltage, and a fourth connector(610) outputting second power voltage inputted through the third connector. A fifth connector provides second power voltage via a third wire(535) connected with the second electrodes of the lamps.

Description

BACK LIGHT ASSEMBLY FOR LIQUID CRYSTAL DISPLAY}

The present invention relates to a backlight assembly for a liquid crystal display device, and more particularly, to a backlight assembly for a liquid crystal display device in which a lamp wire alignment structure is simplified.

In general, since most liquid crystal display devices are light-receiving devices that display an image by adjusting the amount of light coming from the outside, a separate light source, that is, a backlight assembly, for irradiating light to the liquid crystal display panel is necessary.

The backlight assembly has an edge type backlight unit having a structure in which the light of the lamp is incident on the liquid crystal display panel through the light guide plate according to the position where the lamp unit is installed, and uniformly generated light from the lamp by the diffuser plate. After that, it is divided into a direct type backlight unit having a structure that is incident on the liquid crystal display panel.

The edge method in which the lamp unit is installed on the side of the light guide plate is mainly applied to a relatively small liquid crystal display device such as a monitor of a lap-top type computer and a desk-top type computer. The light uniformity is good, the durability life is long, and it is advantageous for the thinning of the liquid crystal display device.

On the other hand, as the size of the liquid crystal display device began to be enlarged to 20 inches or more, a direct development method is to directly illuminate the front surface of the liquid crystal display panel by arranging a plurality of lamps in a row on the lower surface of the diffusion plate.

Such a direct method is mainly used for a large screen liquid crystal display device requiring high brightness because the light utilization efficiency is higher than that of the edge method.

FIG. 1 is a view for explaining a general backlight assembly, and particularly for a backlight assembly for a direct type liquid crystal display.

Referring to FIG. 1, a typical backlight assembly for a direct type liquid crystal display includes a reflector 10, a plurality of lamps 22, 24, 26, and 28 disposed on the reflector, and lamps 22, 24, 26, and 28. First to fourth lamp wires 31, 33, 35, and 37 connected to hot electrodes of the first and fourth return wires 32 and 34, respectively, to cold electrodes of lamps 22, 24, 26, and 28, respectively. , 36, 38, and first through fourth connectors 42, 44, 46, and 48. Here, the first to fourth connectors 42, 44, 46, and 48 are connected to the hot electrodes and the cold electrodes of the lamps 22, 24, 26, and 28, respectively, to supply power voltages supplied from the outside to the lamps 22, 24. , 26 and 28, respectively.

When assembling, the lamp array is arranged on the upper part of the reflector plate 10, and return wires 32, 34, 36, and 38 for supplying power to the arranged lamp array are connected to the connector via the lower part of the reflector plate 10, respectively. Supply power to the lamp.

However, there is a problem in that a groove or a lamp reflector must be formed in the reflector in order to route the return wire under the reflector.

In addition, under the conventional backlight assembly structure, the reflective plate assembly process located under the lamp is very difficult, and there is a problem that the lamp may be broken or the return wire may be broken during operation.

Accordingly, the present invention provides a backlight assembly for a liquid crystal display device which simplifies a return wire alignment structure of a lamp by using a printed circuit board.

1 is a view for explaining a general backlight assembly.

2 is a view for explaining a direct type backlight assembly according to the present invention.

3 is a view for explaining a liquid crystal display device employing a direct type backlight assembly according to the present invention.

<Description of the symbols for the main parts of the drawings>

10, 100: reflector 22, 24, 26, 28, 200: lamp

42, 44, 46, 48: connector 300: hot electrode connection

400: first cold electrode connector 500: printed circuit board

600: second cold electrode connection 700: low mold

810: diffuser plate 820: upper mold

90 bottom chassis 900 liquid crystal display panel

910: top chassis

According to one aspect of the present invention, there is provided a backlight assembly for a liquid crystal display device comprising: a reflector; A plurality of lamps arranged above the reflector; A plurality of first connectors connected to the first electrodes of the lamps through first wires to provide first power voltages supplied from the outside to the first electrodes; A second connector for receiving a second power voltage provided from the outside; A third connector connected to the second connector through a second wire to receive the second power supply voltage, and a plurality of fourth connectors for outputting a second power supply voltage input through the third connector; A circuit board; And a fifth connector configured to provide the second power voltage input through the fastening with the fourth connector via a third wire connected to the second electrode of the lamp.

According to the backlight assembly for a liquid crystal display device, it is possible to simplify the alignment structure of the return wire connected to the lamp by using a printed circuit board.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the present invention.

2 is a view for explaining a backlight assembly for a liquid crystal display device according to the present invention, in particular a view for explaining a direct type backlight assembly.

2, the direct type backlight assembly according to the present invention includes a reflector plate 100, a lamp array 200, a hot electrode connector 300, a first cold electrode connector 400, a printed circuit board 500, and the like. The second cold electrode connection part 600 is included.

The reflector 100 is disposed under the lamp array 200 to reflect the light emitted from the lamp array 200 to improve the efficiency of the light. Here, the reflecting plate 100 may be a flat type that does not include a lamp reflector or forms a separate groove for accommodating the return wire of the lamp.

The lamp array 200 includes first to fourth lamps 210, 220, 230, and 240 arranged on the reflective plate 100 and first to fourth wires 212, 222, and 232 connected to hot electrodes of the respective lamps. 242, and fifth to eighth wires 214, 224, 234, and 244 connected to the cold electrodes of each lamp.

The hot electrode connection part 300 includes the first to second hot electrode connectors 310 and 320, and receives the first power voltage supplied from the outside to the first to fourth lamps 210, 220, 230, and 240. The first to fourth wires 212, 222, 232, and 242 are provided to the hot electrodes of the via electrodes. Of course, although two lamps are connected in parallel to one hot electrode connector in one embodiment, one lamp may be connected to one hot electrode connector, and three or more may be connected to one hot electrode connector. The lamps may be connected in parallel. Here, the first to second hot electrode connectors 310 and 320 are preferably plug-in.

The first cold electrode connector 400 is formed of the first to second cold electrode connectors 410 and 420, and the second power supply voltage is provided from the printed circuit board 500 through coupling with the printed circuit board 500. Preferably, the ground power source is provided to the cold electrodes of the first to fourth lamps 210, 220, 230, and 240 via the fifth to eighth wires 214, 224, 234, and 244. Of course, in the drawings, two lamps are connected to one cold electrode connector in parallel in one embodiment, but one lamp may be connected to one cold electrode connector, and three to one cold electrode connector. The above lamps may be connected in parallel. Here, the first to second cold electrode connectors 410 and 420 are preferably plug-in.

The printed circuit board 500 may include a first connector 510 for receiving a second power supply voltage, a second connector 520 for outputting a second power supply voltage, and a third connector 530 for outputting a second power supply voltage. And a second power supply voltage provided from the second cold electrode connector 600 to the cold electrodes of the first to fourth lamps 210, 220, 230, and 240 via the first cold electrode connector 400. Provide each. Here, the first connector 510 is preferably a socket for accommodating a plug connected to the wire 535, and the second and third connectors 520 and 530 are plug type first to second cold electrode connectors. It is preferably a socket for accommodating 410 and 420, respectively.

The second cold electrode connector 600 includes a fourth connector 610, and receives a second power voltage externally through a connector connection to the first connector 510 of the printed circuit board 500 through a wire 535 connected thereto. To provide. Here, the fourth connector 610 is preferably a plug-in.

Then, the assembly sequence of the direct type backlight assembly according to the present invention will be briefly described.

First, the wires 212, 222, 232, and 242 of the hot electrodes of the lamps 210, 220, 230, and 240 are connected to the connectors 310 and 320 for the first to second hot electrodes, and the wires for the cold electrodes. 214, 224, 234, and 244 are connected to the first to second cold electrode connectors 410 and 420, and then the reflective plate 100 is assembled.

Then, the connectors 410 and 420 respectively connected to the cold electrode wires 214, 224, 234 and 244 of the lamp are connected to the respective connectors 520 and 530 formed on the printed circuit board 500, and the printed circuit board The first connector 510 and the second cold electrode connector 600 of 500 are connected through the wire 535.

According to such a direct type backlight assembly, it is possible to solve the problem of damage to the return wire of the lamp caused by the reflector and the reduction of working efficiency by removing the return wire connected to the cold electrode of the lamp.

In addition, in order to align the return wire connected to the cold electrode of the lamp in general, a certain groove is formed in the reflector, and a return wire is inserted through the inside of the formed groove to connect with the connector connected to the hot electrode. The return wire can be easily processed without forming a groove.

3 is a view for explaining a liquid crystal display device employing a direct type backlight assembly according to the present invention.

Referring to FIG. 3, the direct type liquid crystal display according to the present invention includes a bottom chassis 90, a reflecting plate 100, a lamp 210, a low mold 700, a diffusion plate 810, an upper mold 820, The liquid crystal display panel 900 and the top chassis 910 are included.

The bottom chassis 90 has a rectangular shape corresponding to the liquid crystal panel 900, and a storage space having a predetermined depth is formed from an upper surface to a lower surface to accommodate the reflector plate 100 and the lamps 210. A diffuser plate support having a larger area than the storage space is formed so that the diffuser plate 810 is seated. An outer portion of the diffuser plate support includes a fastening part (not shown) to which the upper mold 820 and the top chassis 910 are coupled. Is formed. The lamp unit 210 may be installed to be spaced apart from the lamp unit 210 by a predetermined depth to prevent direct exposure to the heat emitted from the lamp 210.

The reflector 100 is accommodated in the bottom surface of the bottom chassis 90 to diffusely reflect light. Here, the reflector according to the present invention can easily accommodate the wire connected to the cold electrode of the lamp even without forming a separate groove for accommodating the return wire.

The lamp 210 is installed on the upper surface of the reflector 100 to emit light toward the liquid crystal display panel 900.

The row mold 700 is installed along the inner wall of the bottom chassis 90 and blocks the flow of the reflecting plate 100 and accommodates hot and cold electrodes of a plurality of lamps arranged in parallel, respectively, and the lamp 210. The lamp wire 214 drawn out from the hot electrode or the cold electrode of the printed circuit board accommodates the connector 510 for connection with the connector 410 connected to one side. In general, it is preferable that the printed circuit board be placed upright in consideration of the fact that it is flat.

In addition, it is preferable to further include a kind of reflecting means on the inner surface on which the row mold 700 is formed to reflect light toward the effective display area where the screen is displayed in the liquid crystal display device.

The diffusion plate 810 is installed to be spaced apart from the lamp units by a predetermined interval, and diffuses the light emitted from the lamp unit to improve the uniformity of the light. Although not shown in the drawings, it is obvious that various optical sheets such as a diffusion sheet, a lower prism sheet, an upper prism sheet, and a protective sheet are arranged on the upper portion of the diffusion plate 810.

The upper mold 820 is seated on the top surface of the bottom chassis 90 and the top surface of the diffusion plate 810 and is coupled to the bottom chassis 90 to block the flow or departure of the diffusion plate 90. Preferably not only the diffusion plate, but also blocks the flow or separation of the various optical sheets described above.

The liquid crystal display panel 900 is mounted on an upper surface of the upper mold 820, preferably on an upper portion of the support member extending inwardly, to display image information.

The top chassis 910 is covered on the upper portion of the liquid crystal display panel 900 to block the separation of the liquid crystal display panel 900 through the fastening of the upper mold 820 and the bottom chassis 90.

According to the present invention, it is possible to implement a backlight assembly even if a groove is formed in the reflector to accommodate a separate return wire or a separate lamp reflector is not received.

In addition, according to the present invention, when assembling the lamp on the upper part of the reflector assembly, the lamps and the reflecting plate is reversed, the return wires are aligned, and then reversed again to assemble other diffuser plates or liquid crystal display panels, etc. It is possible to assemble the lamp according to the order of assembling other diffuser plate or liquid crystal display panel after arranging the lamps directly on the reflector, and fastening with the connectors connected to the arranged lamps and the connectors formed on the printed circuit board. The number of processes can be reduced.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

As described above, according to the present invention, the wires connected to the hot electrodes of the lamps or the wires connected to the cold electrodes are performed through one connector in the direct type backlight assembly to separate the return wires under the reflector. The backlight assembly can be easily implemented even without forming the grooves of the grooves.

In addition, it is possible to solve the problem that the lamp is broken when assembling the direct type backlight assembly, or that the return wire accommodated in the lower portion of the reflector is disconnected.

Claims (6)

Reflector; A plurality of lamps arranged above the reflector; A plurality of first connectors connected to the first electrodes of the lamps through first wires to provide first power voltages supplied from the outside to the first electrodes; A second connector for receiving a second power voltage provided from the outside; A third connector connected to the second connector through a second wire to receive the second power supply voltage, and a plurality of fourth connectors for outputting a second power supply voltage input through the third connector; A circuit board; And And a fifth connector for providing the second power supply voltage input through the fastening with the fourth connector via a third wire connected to the second electrode of the lamp. The backlight assembly of claim 1, further comprising a bottom chassis for accommodating the reflective plate, and a row mold accommodated inside the bottom chassis to accommodate one end and the other end of the lamp, respectively. And the printed circuit board is accommodated in a predetermined gap formed under the sidewall of the row mold. The backlight assembly of claim 1, wherein the fifth connector is connected to second electrodes of at least two adjacent lamps among the plurality of lamps, respectively. The backlight assembly of claim 3, wherein the first connector is one-to-one symmetrical with the fifth connector and is connected to a first electrode of a lamp to which the fifth connector is connected. The backlight assembly of claim 1, wherein the third connector is a socket for receiving a plug connected to the second wire. The backlight assembly of claim 1, wherein the fifth connector is a plug, and the fourth connector is a socket for accommodating the fifth connector.