KR100948622B1 - Back light assembly and liquid crystal display device having same - Google Patents

Abstract

Background Art A backlight assembly capable of reducing thickness and a liquid crystal display having the same are disclosed. The backlight assembly includes a lamp assembly including a plurality of lamps for generating light, a bottom part and a side part, and is disposed at the side of the storage container accommodating the lamp assembly and a storage container parallel to the longitudinal direction of the lamp to generate a lamp driving voltage. It includes a power generator. Since the power generating unit is disposed on the side of the storage container, the thickness can be reduced, and the temperature deviation along the longitudinal direction of the lamp can be eliminated.

Description

BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY APPARATUS HAVING THE SAME}

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

FIG. 2 is a cross-sectional view of the backlight assembly shown in FIG. 1.

3 is a perspective view illustrating a coupling relationship between the storage container, the power generator, and the shield case illustrated in FIG. 1.

4 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

5 is a cross-sectional view of the liquid crystal display shown in FIG. 4.

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

1000: backlight assembly 100: lamp assembly

200: storage container 300: power generation unit

310: inverter 320: shield case

700: display unit 710: liquid crystal display panel

800: top chassis

The present invention relates to a backlight assembly and a liquid crystal display having the same, and more particularly, to a backlight assembly including an inverter for driving a lamp for generating light and a liquid crystal display having the same.

In general, the liquid crystal display device (Liquid Crystal Display Device) is a flat panel display device that displays an image using a liquid crystal (Liquid Crystal), is thinner and lighter than other display devices, has a low power consumption and low driving voltage It has advantages and is used extensively throughout the industry.

The LCD includes a liquid crystal display panel for displaying an image and a backlight assembly for supplying light to the liquid crystal display panel.

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, 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 is widely employed.

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 connected in parallel, and a plurality of lamps are simultaneously lit by one or two inverters is developed. It has been. In this case, the inverter is disposed at the rear of the backlight assembly.

The liquid crystal display of this type has the advantage of reducing the number of inverters, the following problems occur.

First, in order to drive several lamps with one inverter, the size of the inverter is increased, which causes a problem of increasing the thickness of the liquid crystal display. Second, the length of the lamp wire for applying the driving voltage to the lamp is long, the problem that the amount of leakage current is increased. Third, the inverter is disposed to be biased to one side of the rear surface of the backlight assembly to generate a left and right deviation of the heat generation amount.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a backlight assembly capable of reducing the thickness of the liquid crystal display and reducing leakage current and temperature variation.

Another object of the present invention is to provide a liquid crystal display device having the above-described backlight assembly.

The backlight assembly for achieving the above object of the present invention includes a lamp assembly, a housing and a power generator.

The lamp assembly includes a plurality of lamps for generating light.

The storage container includes a bottom portion and a side portion extending from the bottom portion to accommodate the lamp assembly.

The power generation unit generates a lamp driving voltage for driving the lamp, and the lamp is disposed on the side of the storage container parallel to the longitudinal direction.                     

A liquid crystal display device for achieving another object of the present invention includes a lamp assembly, a storage container, a power generator, a liquid crystal display panel and a top chassis.

The configuration of the lamp assembly, the housing and the power generator is the same as the backlight assembly.

The liquid crystal display panel is disposed above the storage container and displays an image using light generated from the plurality of lamps.

The top chassis is combined with the storage container to fix the liquid crystal display panel.

According to the backlight assembly and the liquid crystal display having the same, the power generation unit for generating the lamp driving voltage for driving the lamp is disposed on the side of the storage container instead of the rear side, thereby reducing the thickness of the liquid crystal display and reducing leakage current and temperature. The deviation can be reduced.

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

1 is an exploded perspective view of a backlight assembly according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the backlight assembly shown in FIG.

1 and 2, the backlight assembly 1000 according to an embodiment of the present invention includes a lamp assembly 100, a storage container 200, and a power generator 300.

The lamp assembly 100 includes a plurality of lamps 110 for generating light and conductive clip parts 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 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 surface of the first end of the lamp body 112, and a lamp body 112 facing the first end. The second electrode 116 is formed on the two end surfaces. Here, the first electrode 114 and the second electrode 116 are external electrodes formed through a process such as plating or taping.

The conductive clips 120 and 122 may include a first conductive clip 120 disposed at a first end of the plurality of lamps 110 and a second conductive clip portion disposed at a second end of the plurality of lamps 110. 122). Each of the first and second conductive clips 120 and 122 may include first and second clips 120a and 122a coupled to the first and second electrodes 114 and 116, and a plurality of first and second clips. It consists of first and second fixing plates 120b and 122b connecting the clip portions 120a and 122a, respectively. In this case, the first and second clip parts 120a and 122a and the first and second fixing plates 120b and 122b may use the first and second electrodes 114, 114 to apply the lamp driving voltage applied from the power generator 300. 116 is made of a conductive material. In addition, the first and second fixing plates 120b and 122b are connected to the first and second power lines 120c and 122c for electrical connection with the power generator 300, respectively.

The storage container 200 includes a bottom portion 220 and a side portion 230 extending from the bottom portion 220. The lamp assembly 100 is accommodated in the storage space formed of the bottom portion 220 and the side portion 230 of the storage container 200.

The power generator 300 is disposed outside the side portion 230 of the storage container 200. Specifically, the power generation unit 300 is disposed on the side portion 230 parallel to the longitudinal direction of the lamp 110 of the four side portions 230 of the storage container 200. As such, the power generator 300 may be disposed on the side portion 230 of the storage container 200, thereby reducing the overall thickness of the backlight assembly 1000.

The power generator 300 includes an inverter 310 for generating a lamp driving voltage. The inverter 310 boosts the voltage of the low potential applied from the outside to the voltage of the high potential for driving the lamp 110. The lamp driving voltage boosted by the high potential voltage is connected to the first and second conductive clips 120 and 122 through the first and second power lines 120c and 122c respectively connected to both ends of the power generator 300. Is applied to. As such, by directly connecting the first and second power lines 120c and 122c to both ends of the power generator 300, the lengths of the first and second power lines 120c and 122c may be reduced. The leakage current generated from the second power lines 120c and 122c can be reduced.

The backlight assembly 1000 according to an embodiment of the present invention further includes a shield case 320. The shield case 320 is disposed to surround the power generator 300 disposed on the side portion 230 of the storage container 200 to shield the electromagnetic waves generated from the power generator 300 from leaking to the outside.

In addition, the backlight assembly 1000 further includes a reflective sheet 400 disposed on the bottom portion 220 of the storage container 200. The reflective sheet 400 reflects the light directed downward among the light generated from the plurality of lamps 110.

3 is a perspective view illustrating a coupling relationship between the storage container, the power generating unit, and the shield case shown in FIG. 1.

Referring to FIG. 3, the power generator 300 and the shield case 320 are coupled to the side portion 230 of the storage container 200.

The power generator 300 includes an inverter 310 mounted on a printed circuit board (PCB) and other electronic components (not shown), and is insulated from the storage container 200 made of a conductive chassis material. It is coupled to the side 230 and a predetermined distance apart for. To this end, the storage container 200 includes a screw hole and a first coupling portion 232 protruding from the side portion 230 by a predetermined height. The power generation unit 300 is fixed to the side portion 230 of the storage container 200 by screwing with the first coupling portion 232.

The shield case 320 is coupled to the side portion 230 to which the power generator 300 is coupled to surround the power generator 300. The storage container 200 further includes a second coupling part 234 including a screw hole and protruding to a predetermined height from the side part 230, and the shield case 320 is connected to the screw coupling with the second coupling part 234. It is fixed to the side portion 230 of the storage container 200 by. Here, since the housing 200 itself is grounded, the power generator 300 and the shield case 320 do not need to be grounded separately.

On the other hand, although not shown, the power generating unit 300 and the shield case 320 may be manufactured in one set, and then coupled to the side portion 230 of the storage container 200, and received by various other methods. It may be disposed on the side portion 230 of the container 200.

4 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 5 is a cross-sectional view of the liquid crystal display shown in FIG. 4. In the present embodiment, the same name and reference numerals will be used for the same configuration as that of the backlight assembly 1000.

4 and 5, the liquid crystal display 2000 according to an exemplary embodiment of the present invention may include a display unit 700 for displaying an image and a backlight assembly 600 for providing light to the display unit 700. ) And a top chassis 800 for securing 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 for providing driving signals for driving the liquid crystal display panel 710, and gate printed circuit boards 720 and 730. 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.

The liquid crystal display panel 710 is interposed between a thin film transistor (hereinafter, referred to as TFT) substrate 712, a color filter substrate 714 coupled to the TFT substrate 712, and two substrates 712 and 714. Liquid crystal (not shown).

The TFT substrate 712 is a transparent glass substrate on which a switching element TFT (not shown) is formed in a matrix form. A data line is connected to a source terminal of the TFTs, and a gate line is connected to a gate terminal. In addition, a pixel electrode made of a transparent conductive material is connected to the drain terminal.

The color filter substrate 714 is disposed to face the TFT substrate 712 at regular intervals. The color filter substrate 714 is a substrate in which RGB pixels, which are color pixels expressed in a predetermined color when light passes, are formed by a thin film process. A common electrode made of a transparent conductive material is formed on the front surface of the color filter substrate 714.

In the liquid crystal display panel 7510 having such a configuration, when power is applied to the gate terminal and the source terminal of the TFT and the TFT is turned on, an electric field is formed between the pixel electrode and the common electrode. By the electric field, the arrangement angle of the liquid crystal injected between the TFT substrate 712 and the color filter substrate 714 is changed, and the light transmittance is changed according to the changed arrangement angle to obtain an image having a desired gradation.

The backlight unit 600 is provided below the display unit 700 to provide uniform light to the display unit 700.

The backlight assembly 600 includes a lamp assembly 100 including a plurality of lamps 110 for generating light, a bottom portion 220, and a side portion 230 extending from the bottom portion 220. It includes a receiving container 200 for receiving a, and a power generating unit 300 is disposed on the side portion 230 of the receiving container 200 parallel to the longitudinal direction of the lamp 110 to generate a lamp driving voltage.

In addition, the backlight assembly 600 includes a first fixing member 610 for fixing the lamp assembly 100, a diffusion plate 620 for diffusing light generated from the lamp 110, and improving luminance uniformity. A plurality of optical sheets 630 provided on the plate 620 to improve luminance uniformity and front luminance, and a second fixing member 640 for fixing the diffusion plate 620 and the plurality of optical sheets 630. More).

The first fixing member 610 accommodates and fixes the lamp assembly 100 and is fastened and fixed inside the storage container 200. In addition, a stepped portion for accommodating the diffusion plate 620 and the plurality of optical sheets 630 is formed on an upper surface of the first fixing member 610. 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 include a diffusion sheet for diffusing the light passing through the diffusion plate 620 and a prism sheet for condensing 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 a stepped portion for guiding the storage of the liquid crystal display panel 710 on the upper surface thereof. Is formed.

The liquid crystal display panel 710 mounted on the first fixing member 640 is fixed by the top chassis 800.

The top chassis 800 is made of metal having high strength such as stainless steel, and an upper surface of the top chassis 800 presses the periphery of the liquid crystal display panel 710, and sidewalls of the top chassis 800 are accommodated. The liquid crystal display panel 710 is coupled to the side portion 230 of the container 200 to prevent the liquid crystal display panel 710 from being separated from the backlight assembly 600. At this time, the sidewalls corresponding to the power generator 300 and the shield case 320 among the four sidewalls of the top chassis 800 are different from the sidewalls of the other sidewalls, so that the upper surface thereof is further extended so that the power generator 300 and the shield case It is formed to surround the (320). Therefore, the coupling reliability of the power generator 300 can be further improved, and the electromagnetic waves generated from the power generator 300 can be shielded more efficiently.

According to such a backlight assembly and a liquid crystal display having the same, the thickness of the liquid crystal display can be reduced by disposing a power generation unit for generating a lamp driving voltage on the side of the backlight assembly.

In addition, by arranging the power generating portion on the side parallel to the longitudinal direction of the lamp, the length of the power line connecting the lamp assembly and the power generating portion can be reduced to reduce the leakage current generated through the power line, The resulting temperature deviation can be eliminated.

In addition, by disposing the power generator between the storage container and the top chassis, it is possible to shield the electromagnetic waves generated by the power generator more efficiently.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (10)

A lamp assembly comprising a plurality of lamps for generating light; A storage container accommodating the lamp assembly comprising a bottom part and a side part extending from the bottom part; And a power generation unit configured to generate a lamp driving voltage for driving the lamp, and to be disposed at a side of the storage container parallel to a length direction of the lamp. delete The backlight assembly of claim 1, wherein the power generation unit includes an inverter for boosting a low potential voltage applied from the outside to a high potential voltage for driving the lamp. The backlight assembly of claim 1, further comprising a shield case for shielding electromagnetic waves generated from the power generator. The backlight assembly of claim 1, wherein the plurality of lamps are disposed in parallel with each other on a bottom portion of the storage container, and external electrodes are formed at both ends of the lamps. The lamp assembly of claim 5, wherein the lamp assembly is connected to the external electrode to fix both ends of the plurality of lamps, and further includes a conductive clip unit configured to apply lamp driving voltages generated from the power generator to the plurality of lamps. Backlight assembly comprising a. A lamp assembly comprising a plurality of lamps for generating light; A storage container accommodating the lamp assembly comprising a bottom part and a side part extending from the bottom part; A power generation unit arranged at a side of the storage container parallel to the longitudinal direction of the lamp to generate a lamp driving voltage; A liquid crystal display panel disposed on the storage container and configured to display an image by using light generated from the plurality of lamps; And And a top chassis coupled to the storage container for fixing the liquid crystal display panel. The liquid crystal display of claim 7, wherein the power generating unit is disposed between the storage container and the top chassis. The method of claim 7, wherein the power generating unit An inverter for boosting a low potential voltage applied from the outside to a high potential voltage; And And a shield case for shielding electromagnetic waves generated from the inverter. The liquid crystal display of claim 7, wherein the plurality of lamps are disposed in parallel with each other on the bottom of the storage container, and external electrodes are formed at both ends of the lamps.

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