KR20060029342A - Backlight unit - Google Patents

Abstract

The present invention can reduce the production cost by eliminating the synchronous cable connector and one input connector and the synchronous cable, improve the temperature characteristics by placing the control board at the bottom of the back of the LCM, to secure the free space on the back of the LCM In order to provide a suitable backlight unit, a backlight unit for achieving the above object comprises a plurality of light emitting lamps arranged in one direction on the upper structure; A master / slave integrated inverter PCB disposed in one direction on a lower rear surface of the lower structure; It characterized in that it comprises a control board spaced apart a predetermined interval on the center upper side of the master / slave integrated inverter PCB.

Master, Slave, Inverter PCB, Control Board

Description

Backlight unit

1 is a rear configuration diagram of a backlight unit according to the prior art

2 is a rear configuration diagram of the backlight unit according to the embodiment of the present invention;

3 is a cross-sectional view taken along line II ′ of FIG. 2.

4 is a cross-sectional view taken along line II-II ′ of FIG. 2.

Explanation of symbols on the main parts of the drawings

20: substructure

30: master / slave inverter PCB

31: input connector 32a: first output connector

32b: 2nd output connector 33: 1st holder

34: second cradle 40: control board

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit, and more particularly, to a backlight unit that can reduce production costs, improve temperature characteristics, and secure a free space on the back of an LCM.                         

CRT (Cathode Ray Tube), one of the commonly used display devices, is mainly used for monitors such as TVs, measuring devices, and information terminal devices.However, due to the weight and size of the CRT itself, Could not respond actively to demands.

Therefore, in the trend of miniaturization and light weight of various electronic products, CRT has a certain limit in weight and size, and is expected to replace the liquid crystal display (LCD) and gas discharge using electro-optic effects. Plasma Display Panels (PDPs) and Electro Luminescence Displays (ELDs) using electroluminescent effects are used. Among them, research on liquid crystal displays is being actively conducted.

In order to replace the CRT, liquid crystal display devices having advantages such as small size, light weight, and low power consumption have been actively developed. Recently, the liquid crystal display device has been developed enough to perform a role as a flat panel display device. As it is used for a monitor of a desktop computer and a large information display device, the demand for a liquid crystal display device is continuously increasing.

Since most of the liquid crystal display devices are light-receiving devices that display images by controlling the amount of light coming from the outside, a separate light source for illuminating the LCD panel, that is, a backlight unit, is necessary.

In general, a backlight unit used as a light source of a liquid crystal display device is a method of disposing a cylindrical light emitting lamp, and is divided into an edge method and a direct method.                         

In the double-edge method, the lamp unit is installed on the side of the light guide plate for guiding the light, and the lamp unit covers a lamp emitting light, a lamp holder inserted at both ends of the lamp to protect the lamp, and an outer circumferential surface of the lamp, and one side It is provided with a lamp reflector plate fitted to the side of the light guide plate to reflect the light emitted from the lamp toward the light guide plate.

The edge method in which the lamp unit is installed on the side of the light guide plate is applied to a relatively small liquid crystal display device such as a monitor of a laptop computer and a desktop computer, and has good uniformity of light and a long service life. It is advantageous to thin the liquid crystal display device.

On the other hand, the direct type method has been developed mainly as the size of the liquid crystal display device has increased to 20 inches or more, and a plurality of lamps are arranged in a row on the lower surface of the diffuser plate to direct light directly to the front of the LCD panel. will be.

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

However, the liquid crystal display device adopting the direct method is used as a large monitor or a television, so it takes longer to use than a laptop computer and the number of lamps is larger, so the liquid crystal of the direct method is lower than the edge type liquid crystal display device. It is more likely that a lamp that will not turn on will appear due to the failure and life of the lamp in the display.

In addition, in the edge method in which the lamp units are installed on both side surfaces of the light guide plate, due to the life and failure of the lamp, for example, when only one lamp is not turned on, only the brightness on the screen is lowered. However, in the direct method, since a plurality of lamps are installed at the bottom of the screen, for example, if one lamp does not light up, the lamp is not lit. The unseen part will appear on the screen immediately.

For this reason, since the lamp is frequently replaced in the direct type liquid crystal display device, the direct type liquid crystal display device should have an easy structure for disassembling and assembling the lamp unit.

Hereinafter, a conventional backlight unit will be described with reference to the accompanying drawings.

1 is a rear configuration diagram of a backlight unit according to the prior art.

As shown in FIG. 1, the conventional backlight unit includes a plurality of light emitting lamps (not shown) arranged in one direction on the lower structure 10 and a master provided spaced apart from both side edges of the rear surface of the lower structure 10. And a control board 15 for outputting drive signals to the inverter PCB 11a, the slave inverter PCB 11b, and the LCD panel.

In this case, the light emitting lamp is an external electrode light emitting lamp (EEFL) having first and second electrodes formed at both ends of the tube, and the first and second electrodes of the plurality of light emitting lamps are first and second power lines (not shown). Are connected in parallel. The first and second power lines are connected to the master inverter PCB 11a and the slave inverter PCB 11b, respectively.

The master inverter PCB 11a and the slave inverter PCB 11b are disposed at both bottom edges of the bottom of the lower structure 10, respectively, and the control board 15 is disposed at the top of the bottom of the lower structure 10.

The light emitting lamp of the backlight unit is driven in a high-high (HH) manner, and one side of the lower structure 10 includes a master inverter PCB 11a mounted with a main controller, and the other side has a gating signal from the main controller. The slave inverter PCB 11b is configured to receive and operate via a synchronous cable connector.

The master inverter PCB 11a has not only a first input connector 12a and a first output connector 13a and a first synchronous cable connector 14a and a plurality of transformers T11 and T12 but also mains, although not shown in the drawing. The controller and the protection circuit are configured, and the slave PCB 11b includes a second input connector 12b, a second output connector 13b, a second synchronous cable connector 14b, and a plurality of transformers T13 and T14. It is.

As described above, since the main controller and the protection circuit are further mounted on the master inverter PCB 11a than the slave inverter PCB 11b, the master inverter PCB 11a is larger than the slave inverter PCB 11b.

As described above, the conventional backlight unit has the following problems.

First, since the main controller and the protection circuit are mounted more on the master inverter PCB 11a, the size of the master inverter PCB 11a is larger than that of the slave inverter PCB 11b. It is difficult to work or assembly process because it needs to be handled separately and assembled separately when assembling the backlight unit.

Second, since the master inverter PCB and the slave inverter PCB are separated from each other, a medium for transmitting and receiving signals, that is, a first and a second synchronous cable connector and a power line for connecting the same, additionally, there is a limit in reducing production costs.

Third, the operating frequency of the control board is increasing at a high frequency. Since the LCM is used upright, there is a problem in that the temperature of the upper LCM is further increased due to convection.

Fourth, the control board, the master inverter PCB and the slave inverter PCB occupy a high proportion on the back of the LCM, and thus are restricted spatially to arrange the power supply on the set.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a backlight unit that can reduce the production cost by eliminating the synchronous cable connector and one input connector and the synchronous cable.

Another object of the present invention to provide a backlight unit that can improve the temperature characteristics by placing the control board on the bottom of the back of the LCM.

Another object of the present invention is to provide a backlight unit suitable for securing a free space on the back of the LCM.

The backlight unit according to the present invention for achieving the above object comprises a plurality of light emitting lamps arranged in one direction on the lower structure; A master / slave integrated inverter PCB disposed in one direction on a lower rear surface of the lower structure; It characterized in that it comprises a control board spaced apart a predetermined interval on the center upper side of the master / slave integrated inverter PCB.

The master / slave integrated inverter PCB on one side of the control board is provided with an input connector, a first output connector and a plurality of transformers, and the master / slave integrated inverter PCB on the other side of the control board has a second output connector and a plurality of transformers. Characterized in that they are configured.

The plurality of transformers are characterized in that arranged in the horizontal direction.

The master / slave inverter PCB is supported by a plurality of first cradles between the lower structure and the lower structure.

The control board is supported by a plurality of second holders between the lower structure.

The first and second cradles are characterized in that the embossed shape.

The light emitting lamp is characterized by using an external electrode light emitting lamp (EEFL) having first and second electrodes formed at both ends of the tube.

Hereinafter, a backlight unit according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a rear configuration diagram of a backlight unit according to an exemplary embodiment of the present invention, FIG. 3 is a cross-sectional view taken along the line II ′ of FIG. 2, and FIG. 4 is a cross-sectional view taken along the line II-II ′ of FIG. 2. to be.

As shown in FIGS. 2, 3, and 4, a backlight unit according to an embodiment of the present invention includes a plurality of light emitting lamps (not shown) arranged in one direction on an upper portion of the lower structure 20, and the lower portion. Master / slave integrated inverter PCB 30 disposed in one direction at the bottom of the rear surface of the structure 20, and the control board 40 is spaced at a predetermined interval above the center of the master / slave integrated inverter PCB 30. It is configured by. The control board 40 outputs a driving signal to the LCD panel (not shown).

The light emitting lamp of the backlight unit is driven in a high-high (HH) manner, and requires a master inverter PCB mounted with a main controller and a slave inverter PCB for operating by receiving a gating signal from the main controller. And Slave are integrated in one inverter PCB.

In this case, the light emitting lamp is an external electrode light emitting lamp (EEFL) having first and second electrodes formed at both ends of the tube, and the first and second electrodes of the plurality of light emitting lamps are first and second power lines (not shown). Are connected in parallel. The first and second power lines are connected to the master / slave inverter PCB 30.

The master PCB / slave inverter PCB 30 on one side of the control board 40 is provided with an input connector 31, a first output connector 32a, and a plurality of transformers T21 and T22. 40) The second output connector 32b and the plurality of transformers T23 and T24 are formed in the master / slave inverter inverter 30 on the other side.

The plurality of transformers T21 and T22 (T23 and T24) are disposed in a horizontal direction to reduce the width of the master / slave integrated inverter PCB 30 as much as possible.                     

In addition, the master / slave integrated inverter PCB 30 is supported by the plurality of first cradles 33 between the lower structure 20 and the control board 40 also between the lower structure 20. It is supported by a plurality of second holders 34. The first and second holders 33 and 34 have an embossed shape.

In this case, the second cradles 34 have an appropriate height such that the control board 40 can be spaced apart from the master / slave inverter inverter 30 by a predetermined distance.

As described above, since the master and the slave are mounted on one inverter PCB, the synchronous cable connector and the synchronous cable and the input connector for the slave are not required to connect them.

In consideration of the temperature rise and the free space on the back of the LCM, the master / slave integrated inverter PCB 30 and the control board 40 were arranged on the same line at the bottom of the back of the LCM.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the above embodiments, but should be defined by the claims.

The backlight unit according to the present invention as described above has the following effects.

First, since the master and slave are mounted on one inverter PCB, the production cost can be reduced because a synchronous cable connector and a synchronous cable and an input connector for a slave are not required to connect them.                     

Second, when the LCM is used upright, the temperature at the top rises due to convection. By placing the control board at the bottom of the back of the LCM, it is possible to prevent the problem of temperature increase.

Third, by placing the master / slave integrated inverter PCB and the control board on the same line at the bottom of the LCM back, it is advantageous to secure the free space by reducing the ratio occupied on the back of the LCM.

Fourth, it is easy to configure to minimize the width by placing the transformer in the horizontal direction on the master / slave integrated inverter PCB.

Fifth, since the master and slave are mounted on one inverter PCB, the process of mounting and assembling the PCB can be simplified.

Claims (7)

A plurality of light emitting lamps arranged in one direction on the lower structure; A master / slave integrated inverter PCB disposed in one direction on a lower rear surface of the lower structure; And a control board spaced apart from the center of the master / slave inverter PCB by a predetermined distance. The method of claim 1, The master / slave integrated inverter PCB on one side of the control board is provided with an input connector, a first output connector and a plurality of transformers, And a second output connector and a plurality of transformers are formed in the master / slave integrated inverter PCB on the other side of the control board. The method of claim 2, And the plurality of transformers are arranged in a horizontal direction. The method of claim 1, And the master / slave integrated inverter PCB is supported by a plurality of first cradles between the lower structure and the lower structure. The method of claim 1, The control board is a backlight unit, characterized in that supported by a plurality of second cradle between the lower structure. The method according to claim 4 or 5, And the first and second cradles have an embossed shape. The method of claim 1, The light emitting lamp is a backlight unit using an external electrode light emitting lamp (EEFL) having first and second electrodes formed on both ends of the outer tube.

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