KR20060012204A - Backlight assembly and display apparatus having the same - Google Patents

Abstract

Disclosed is a backlight assembly in which a sensing sensor unit for detecting a leakage current of a lamp is mounted. The backlight assembly includes a lamp assembly including a plurality of lamps for generating light, a sensor unit for detecting leakage current of each of the plurality of lamps, a storage container having a receiving groove formed therein to receive the sensor unit on the bottom surface thereof, and It includes a power generating unit mounted on the back of the storage container to generate a lamp driving voltage. Therefore, the reliability of the leakage current measurement value is increased.

Backlight Assembly, Sensor, Conductor

Description

BACKLIGHT ASSEMBLY AND DISPLAY APPARATUS HAVING THE SAME}

1 is an exploded perspective view illustrating a backlight assembly according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

3 is a cross-sectional view illustrating a first surface of the sensor unit illustrated in FIG. 1.

4 is a cross-sectional view illustrating a second surface of the sensor unit illustrated in FIG. 1.

5 is a perspective view showing in detail the storage container shown in FIG.

6 is a perspective view of the backlight assembly shown in FIG. 1 turned upside down.

FIG. 7 is an exploded perspective view illustrating a liquid crystal display device having the backlight assembly shown in FIG. 1.

<Brief description of the main parts of the drawing>

100: lamp assembly 300: sensor

110: lamp 310: base substrate

120,122: power supply module 320: sensor

200: storage container 330: conductive line

222: storage groove 400: power generation unit                 

225: opening 410: flexible circuit board

The present invention relates to a backlight assembly and a display device having the same, and more particularly, to a backlight assembly including a lamp having an electrode on the outside and a liquid crystal display device having the same.

In general, the liquid crystal display is one of flat panel displays that display an image using liquid crystal.

Recently, as the size of the liquid crystal display device increases, the size of the liquid crystal display panel and the backlight assembly also increases. As a result, the liquid crystal display device has widely adopted a direct type backlight assembly having a plurality of lamps arranged side by side at the rear of the liquid crystal display panel to provide light directly to the liquid crystal display panel.

As the number of lamps increases, a liquid crystal display device having a parallel driving method in which a plurality of lamps are arranged in parallel and electrically arranged in parallel, and a plurality of lamps are simultaneously lit by one or two inverters has been developed. There is a bar.

The liquid crystal display of this type has the advantage of reducing the number of inverters. Instead, when one of the plurality of lamps is turned off, an overcurrent is applied to the remaining lamps, thereby shortening the life of a normally operated lamp and preventing lamp breakage or fire. There is a risk of occurrence.

The present invention is to solve such a problem, the first object of the present invention is to provide a backlight assembly that prevents the remaining light source is continuously broken when any one of the light sources for generating light is broken.

It is a second object of the present invention to provide a liquid crystal display device including the backlight assembly.

The backlight assembly for achieving the above object of the present invention is a lamp assembly. It includes a sensor unit, a storage container, and a power generation unit.

The lamp assembly includes a plurality of lamps for generating light and both ends of the plurality of lamps, and a power supply module for applying a lamp driving voltage to both ends.

The sensor unit detects leakage current of each of the plurality of lamps, outputs a detection value to the power generation unit, and includes a base substrate, a plurality of conductors and conductive lines formed on one surface of the base substrate.

The storage container includes a bottom surface and sidewalls extending from the bottom surface to accommodate the lamp assembly, and a receiving groove for accommodating the sensor part is formed on the bottom surface, and an opening is formed in a portion of the receiving groove. .

The power generation unit is mounted on the rear surface of the storage container, and generates the lamp driving voltage and applies it to the power supply module.

In addition, the backlight assembly further includes a flexible circuit board 410 connecting the power generation unit and the sensor unit and transferring a leakage current value of each lamp detected by the sensor unit to the power generation unit.

According to the backlight assembly, a thinner sensor part can be realized by forming a conductor and a conductive line together on the first surface of the base substrate. Since the thickness of the sensor unit mounted in the storage groove of the storage container is thin, the thickness of the storage container is also reduced and more stable mounting is possible.

In addition, there is an effect of reducing the cost compared to both sides by using the sensor of the cross section.

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

1 is an exploded perspective view of a backlight assembly according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

1 and 2, the backlight assembly 600 according to an embodiment of the present invention includes a lamp assembly 100, a storage container 200, a sensor unit 300, and a power generator 400. .

The lamp assembly 100 includes a plurality of lamps 110 for generating light and power supply modules 120 and 122 for fixing both ends of the plurality of lamps 110 and applying a lamp driving voltage to both ends. .

Specifically, the plurality of lamps 110 are arranged in parallel to each other in a parallel manner. Each lamp 110 is formed of a lamp body 112 having a tube shape, a first electrode 114 formed on the first end surface of the lamp body 112, and a lamp body 112 facing the first end. And a second electrode 116 formed on the second end surface. Here, the first electrode 114 and the second electrode 116 are external electrodes formed through a process such as plating or taping.

The power supply modules 120 and 122 may include a first power supply module 120 disposed at a first end of the plurality of lamps 110 and a second power supply module disposed at a second end of the plurality of lamps 110. Consisting of 122. Each of the first and second power supply modules 120 and 122 may include a clip portion 120b and 122b and a plurality of clip portions 120b and 122b coupled to the first and second electrodes 114 and 116. It consists of fixing plates 120a and 122a connecting to each other. In this case, the clip parts 120b and 122b and the fixing plates 120a and 122a are electrically conductive to apply the lamp driving voltage applied from the power generating part 400 to the first and second electrodes 114 and 116. It is made of material. In addition, power lines 120c and 122c for electrical connection with the power generating unit 400 are connected to the fixing plates 120a and 122a, respectively.

The storage container 200 accommodates the lamp assembly 100 in a storage space consisting of a bottom surface 220 and four side walls 230 extending from the bottom surface 220. In addition, an accommodating groove 222 for accommodating the sensor unit 300 is formed on the bottom surface 220 of the accommodating container 200.

The sensor unit 300 accommodated in the receiving groove 222 includes a base substrate 310 made of an insulating material, a plurality of sensors 320 formed on the base substrate 310, and the plurality of sensors 320. A plurality of conductive lines 330 connected to each other. The plurality of sensors 320 correspond to the plurality of lamps 110 one-to-one and are formed on the base substrate 310 by the number of the lamps 110. In this case, the sensor 320 is made of a conductive material to detect the leakage current generated from the lamp 110. In addition, the plurality of conductive lines 330 are connected to each of the plurality of conductors 320 to extend. The sensor unit 300 is fixed to the receiving groove 222 by a screw fastening or a double-sided tape attached.

The power generator 400 is disposed on the rear surface of the storage container 200, and generates a lamp driving voltage for driving the plurality of lamps 110 and outputs the generated lamp driving voltages to the power supply modules 120 and 122. In addition, the power generation unit 400 is connected to the sensor unit 300 and the flexible circuit board 410, and receives the leakage current value of each lamp 110 detected by the plurality of sensors 320. . Here, the power generator 400 determines whether the lamps 110 operate normally by using the leakage current values of the lamps 110 applied from the sensor unit 300. When the normal leakage current value is not applied from the 110, the lamp assembly 100 is protected in such a manner that no lamp driving voltage is applied to all the lamps 110.

In addition, the backlight assembly 600 further includes a reflective sheet 500 disposed between the plurality of lamps 110 and the bottom surface 220. The reflective sheet 500 is disposed on the entire surface of the bottom surface 220 of the storage container 200, and reflects the light directed downward among the light generated from the plurality of lamps 110 to face upward. In this case, the reflective sheet 500 is made of an insulating material to insulate the plurality of sensors 320.

3 is a perspective view illustrating a first surface of the sensor unit illustrated in FIG. 1, and FIG. 4 is a perspective view illustrating a second surface of the sensor unit soldered to the flexible circuit board.

3 and 4, the sensor unit 300 includes a base substrate 310, a plurality of sensors 320 formed on the first surface 310a of the base substrate 310, and the plurality of sensors ( 320 includes a plurality of conductive lines 330 connected to and extending from each other.

In detail, the base substrate 310 is made of an insulating material, and has a first surface 310a facing the plurality of lamps 110 and a second surface 310b opposite to the first surface 310a. Have

The plurality of sensors 320 are formed at regular intervals on the first surface 310a to correspond one to one to each of the plurality of lamps 110.

Preferably, the plurality of conductive lines 330 connected to the plurality of sensors 320 are formed, and the plurality of conductive lines 330 are formed to be gathered in a predetermined region for connection with the flexible circuit board 410. One end of the conductive line and the flexible circuit board 410 gathered in a predetermined region is soldered, and the opposite end is connected to the power supply 400.

In this case, the sensor unit 300 preferably forms a predetermined opening 310c in an area connected to the flexible circuit board 410. By forming a predetermined opening, the flexible circuit board 410 and the sensor unit do not overlap, thereby ensuring stability when the flexible circuit board is connected to the power supply unit 400.

The sensor unit 300 further includes a first ground layer (not shown) formed on the first surface 310a of the base substrate 310.

The first ground layer (not shown) is made of an electrically conductive material, and is formed in an area except for the plurality of sensors 320 and the conductive line 330 formed on the first surface 310a. do. The first ground layer formed as described above blocks the leakage current generated between the sensor 320 and the sensor 320 or between the conductive line 330 and the conductive line 330, thereby preventing the leakage of the sensor 320. Improve sensor sensitivity.

Here, the first ground layer (not shown) may be connected to each other along the side of the base substrate 310, the second ground layer 350 is the ground container 200 is grounded with the ground (GND) By contact with the ground, it is grounded to the ground GND level.

The sensor unit 300 having such a structure is accommodated in the accommodation groove 222 of the storage container 200.

5 is a perspective view showing in detail the storage container shown in FIG.

Referring to FIG. 5, the storage container 200 includes a bottom surface 220 and four sidewalls 230 extending from the bottom surface 220. The bottom surface 220 is formed in a direction perpendicular to the lengthwise direction of the plurality of lamps 110 mounted on the storage container 200, and has a receiving groove 222 for accommodating the sensor unit 300. do.

The accommodating groove 222 is formed to protrude to the outside of the accommodating container 200 to have a predetermined depth from the bottom surface 220 for accommodating the sensor part 300, and preferably, the sensor part. When protruding by a thickness of 300 to the sensor unit 300 is mounted,

It is formed to form the same plane as the bottom surface 220 of the storage container 200.

In addition, an opening 225 through which the flexible circuit board 410 connecting the sensor unit 300 and the power supply unit 400 may be formed in a portion of the storage container.

FIG. 6 is a perspective view of the backlight assembly shown in FIG. 1 upside down. FIG.

Referring to FIG. 6, an accommodation groove 222 extending in one direction and protruding outward from the bottom surface 220 by a predetermined distance is formed on the bottom surface 220 of the storage container 200. The sensor unit 300 is mounted at 222.

In addition, the power generation unit 400 is disposed to be biased toward one side of the receiving groove 222 on the rear surface of the storage container 200. In this case, power lines 120c and 122c drawn from the power supply modules 120 and 122 are respectively connected to the power generating unit 400.

The power generator 400 and the sensor unit 300 are connected to each other through the flexible circuit board 410. Specifically, one end of the flexible circuit board 410 is electrically connected to the plurality of conductive lines 330, and the other end of the flexible circuit board 410 is the power generation through an opening formed in a portion of the receiving groove. It is connected to the unit 400. In this case, the flexible circuit board 410 is connected to the sensor unit 300 and the power generator 400 using soldering, an anisotropic conductive film (ACF) or a connector. In this case, one end of the flexible circuit board connected to the conductive line 340 is preferably formed by soldering. Therefore, the leakage current value of each lamp 110 detected from the sensor unit 300 is transmitted to the power generation unit 400 through the flexible circuit board 410.

 That is, in the state in which the sensor unit 300 is accommodated in the receiving groove 222, the reflective sheet 500 and the lamp assembly 100 are sequentially mounted in the storage container 200.

7 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention. In the present embodiment, the configuration of the lamp assembly, the sensor unit, the storage container, and the power generation unit is the same as the above-described embodiment of the backlight assembly, and thus duplicated description thereof will be omitted, and the same reference numerals and names are used for the same parts. Let's use.

Referring to FIG. 7, the liquid crystal display 900 according to an exemplary embodiment of the present invention may include a display unit 700 for displaying an image, a backlight assembly 600 for providing light to the display unit 700, and And a top chassis 800 for fixing the display unit 700 to the backlight assembly 600.

The display unit 700 includes a liquid crystal display panel 710 for displaying an image, data and gate printed circuit boards 720 and 730 for providing a driving signal for driving the liquid crystal display panel 710. In this case, the data and gate printed circuit boards 720 and 730 are electrically connected to the liquid crystal display panel 710 through a data tape carrier package (TCP) 740 and a gate TCP 750. do.

The liquid crystal display panel 710 includes a thin film transistor (TFT) substrate 712, a color filter substrate 714 coupled to the TFT substrate 712, and the two substrates 712 and 714. It includes a liquid crystal layer (not shown) interposed therebetween.

The TFT substrate 712 is a transparent glass substrate on which a switching element TFT (not shown) is formed in a matrix form. Data and gate lines are respectively connected to the source and gate terminals of the TFTs, and a pixel electrode (not shown) made of a transparent conductive material is connected to the drain terminal.

The color filter substrate 714 is a substrate in which RGB pixels (not shown) which are color pixels are formed by a thin film process. A common electrode (not shown) made of a transparent conductive material is coated on the front surface of the color filter substrate 714.

A backlight assembly 600 is provided below the display unit 700 having the above configuration to provide uniform light to the display unit 700.

The backlight assembly 600 includes a first fixing member 610 for accommodating the lamp assembly 100, a diffusion plate 620 for diffusing light generated from the lamp assembly 100, and the diffusion plate 620. A plurality of optical sheets 630 and a second fixing member 640 for fixing the diffusion plate 620 and the plurality of optical sheets 630 are provided on the to improve the brightness and viewing angle of the light.

The first fixing member 610 accommodates and fixes the lamp assembly 100, and is fastened and fixed to the storage container 200. In addition, the first fixing member 610 has a stepped portion for receiving the diffusion plate 620 and the plurality of optical sheets 630 on the upper surface. Here, the first fixing member 610 may have a rectangular frame shape, but may be separated into four rod shapes and separately assembled to the storage container 200.                     

The plurality of optical sheets 630 may include a diffusion sheet for diffusing the light passing through the diffusion plate 620 and a prism sheet for collecting the diffused light.

The second fixing member 640 is fastened with the storage container 200 to fix the diffusion plate 620 and the plurality of optical sheets 630, and guides the storage of the liquid crystal display panel 710 on an upper surface thereof. It has a step for

As described above, the liquid crystal display panel 710 mounted on the first fixing member 640 is fixed by the top chassis 800.

According to such a backlight assembly, by forming the conductor and the conductive line of the sensor portion for detecting the leakage current of each lamp together on one surface of the base substrate, the thickness of the sensor portion can be reduced to ensure mounting stability. As the base board can play the role of the sensor unit, it is possible to reduce the cost.

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

Claims (8)

A lamp assembly having a plurality of lamps and a power applying module for supplying power to the lamps; A sensor unit detecting a leakage current of the lamp, including a base substrate, a plurality of conductors and a plurality of conductive lines formed on the first surface of the base substrate; And And a power supply unit supplying the lamp driving voltage. The backlight assembly of claim 1, further comprising a housing for accommodating the lamp assembly. The backlight assembly of claim 2, wherein the storage container comprises a bottom surface and a side wall extending from the bottom surface. The backlight assembly of claim 3, wherein an accommodation groove is formed in the bottom surface to accommodate the sensor unit. The backlight assembly of claim 1, wherein the conductors are disposed to correspond to the plurality of lamps, and the plurality of conductive lines are connected to the conductors, respectively. The backlight assembly of claim 1, further comprising a flexible circuit board for connecting the sensor unit and the power generation unit, wherein the flexible circuit board is connected to a conductive line formed on the first surface of the base substrate. The backlight assembly of claim 1, further comprising a reflective sheet disposed between the plurality of lamps and the bottom surface. A lamp assembly comprising a plurality of lamps and a power supply module for supplying power to the lamp, a sensor unit for detecting a leakage current of the lamp, a power supply unit for supplying a driving voltage to the lamp, the sensor unit base substrate A backlight assembly including a conductor formed on the first surface of the base substrate and a plurality of conductive lines; And And a display panel for modulating the light generated from the backlight assembly to display an image.

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