KR20070102841A - Back light assembly and display apparatus having the same - Google Patents

Abstract

A backlight assembly and a display apparatus having the same are provided to support a diffusion plate and fix a plurality of lamps by a lamp guide by bending a reflection sheet without using a conventional lamp support, thereby reducing manufacturing cost and process through the reduction of the number of parts. A backlight assembly and a display apparatus having the same comprise the following units: a plurality of lamps(300) for generating light; a diffusion plate(330) in which the plurality of lamps is installed; a reflection sheet(400) for reflecting light generated from the plurality of lamps; and a lamp guide(410) which is constructed with a projecting unit for supporting the diffusion plate by bending a part of the reflection sheet towards a space side where the lamps are installed and grooves, installed in the projecting unit, for fixing the lamps.

Description

BACK LIGHT 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 illustrating a combined cross section of the backlight assembly illustrated in FIG. 1.

3 is an enlarged view of a portion A shown in FIG. 1.

4 is a view for explaining a method of forming the reflective sheet shown in FIG.

5 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention.

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

100: backlight assembly 200: storage container

220: side member 300: lamp

310: lamp holder 330: diffusion plate

340: optical sheet 360: side mold

370: top chassis 400: reflective sheet

The present invention relates to a backlight assembly and a display device having the same, and more particularly, to a backlight assembly without a lamp supporter and a display device having the same.

In general, a liquid crystal display is a flat panel display that displays an image using liquid crystal, and is thinner and lighter than other display devices, and has a low driving voltage and low power consumption. It is widely used throughout the industry.

Such a liquid crystal display device requires a separate backlight assembly for irradiating uniform light to the display panel because the display panel for displaying an image is a non-light emitting device that does not emit light by itself.

The backlight assembly includes a metal storage container (eg, a bottom chassis), a plurality of lamps that generate light and are stored in the storage container, and various optical sheets.

Meanwhile, a plurality of lamps are fixed to the storage container, and a lamp support for supporting the diffusion plate disposed on the lamp is coupled. The lamp support is provided with fixing pins for fixing a plurality of lamps, and a cone shape is formed at the center thereof to support the diffusion plate. Since each lamp is fixed by the lamp support, the number of lamp supports increases as the number of lamps increases.

The lamp support has a hook shape coupled to the hole of the storage container. This causes interference in the assembly process, which leads to design constraints, and hooking is difficult to engage during assembly, which requires an additional process. As such, when using a lamp support coupled to a storage container for fixing the lamp, the number of parts increases, the design is restricted, and the manufacturing process and manufacturing cost increase.

Accordingly, an object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a backlight assembly having a lamp support omitted and a display device having the same.

The backlight assembly according to the embodiment for realizing the object of the present invention includes a plurality of lamps, a diffuser plate, a reflective sheet and a lamp guide for generating light. The diffuser plate is disposed above the plurality of lamps, and the reflecting sheet reflects light generated from the plurality of lamps. The lamp guide may include a protrusion for bending a portion of the reflective sheet to a space in which the lamps are disposed to support the diffuser plate, and grooves formed in the protrusion to fix the lamps.

A display device according to an exemplary embodiment for realizing the above object includes a display panel, a plurality of lamps, and a reflective sheet. The display panel displays an image, and the plurality of lamps supply light to the display panel. The reflective sheet has a lamp guide which is bent to the space side where the lamps are arranged to fix the plurality of lamps, and reflects the light generated by the lamps.

According to the backlight assembly and the display device having the same, by fixing the plurality of lamps with the lamp guide formed by bending the reflective sheet and supporting the diffusion plate, the number of parts can be reduced, thereby reducing the manufacturing process and manufacturing cost.

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

1 is an exploded perspective view for explaining a backlight assembly according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a combined cross-sectional view of the backlight assembly shown in Figure 1, Figure 3 is a portion A of FIG. It is an enlarged view.

1 and 3, the backlight assembly 100 according to an embodiment of the present invention includes a storage container 200, a plurality of lamps 300, a diffusion plate 330, an optical sheet 340, and a reflective sheet ( 400 and a mold frame 370.

The storage container (eg, bottom chassis 200) is composed of a bottom member 210 and a side member 220 extending from an edge of the bottom member 210 to define a storage space. For example, the side member 220 may be formed to have a "-" shape to provide a coupling space with other components and to improve the bonding force. The storage container 200 is formed of, for example, a metal having high strength and low deformation.

The plurality of lamps 300 are arranged parallel to each other on the same line, but not shown to operate by the driving voltage provided from the inverter through the lamp wire to generate light. The lamp 300 used for the backlight assembly 100 includes, for example, a Cold Cathode Fluorescent Lamp (CCFL) and an External Electrode Fluorescent Lamp (EEFL). The plurality of lamps 300 may be arranged at equal intervals for uniformity of brightness of the backlight assembly 100, and the number of lamps 300 may be variously changed according to the size of the display panel and the required brightness. In addition, the method of applying the driving voltage may also be variously changed according to the design purpose and characteristics.

Meanwhile, the backlight assembly 100 covers the lamp holder 310 for fixing the plurality of lamps 300 and the distal ends of the plurality of lamps 300, and the side mold 360 supporting the diffuser plate 330. It may further include. End portions of the plurality of lamps 300 are fixed to the lamp holders 310, and the lamp holders 310 are fixed to the storage container 200. For example, two lamps 300 adjacent to each other are coupled to one lamp holder 310. The side mold 360 consists of two side molds 360 to respectively cover both end portions of the plurality of lamps 300. The side mold 360 secures the lamp holders 310 while covering the lamp holders 310 so as not to be exposed to the outside.

The diffusion plate 330 is disposed above the plurality of lamps 300 to diffuse the light generated by the plurality of lamps 300. The diffuser plate 330 has a plate shape having a predetermined thickness, and diffuses light incident from the plurality of lamps 300 to improve luminance uniformity of the emitted light.

The optical sheet 340 is disposed on the diffuser plate 330 and is formed of at least one sheet. The optical sheet 340 changes the path of the light diffused and emitted through the diffusion plate 330 to improve luminance uniformity or to improve front luminance. To this end, the optical sheet 340 is made of a light collecting sheet for condensing the light diffused through the diffusion plate 330 to improve the front brightness, or to diffuse the light diffused through the diffusion plate 330 once again It consists of a diffusion sheet. Meanwhile, the backlight assembly 100 may add or remove the optical sheet 340 according to required luminance characteristics.

The mold frame 370 is combined with the storage container 200 to fix the diffusion plate 330 and the optical sheet 340. In detail, the mold frame 370 is coupled to the side member 220 of the storage container 200 while pressing the edges of the upper surface of the diffusion plate 330 and the optical sheet 340. As the mold frame 370 increases in size, it becomes difficult to manufacture a single piece, and thus the mold frame 370 may be formed by dividing into two or four pieces.

The reflective sheet 400 is disposed under the plurality of lamps 300 to reflect the light generated from the plurality of lamps 300 to travel upward. That is, the reflective sheet 400 is configured to allow light from the plurality of lamps 300 to be directed toward the diffuser plate 30 disposed above the lamps 300 to be directed toward the lower direction of the lamps 300. Reflection to improve light utilization efficiency.

The reflective sheet 400 includes a lamp guide 410 that is bent toward the space in which the plurality of lamps 300 are disposed at the center and protrudes upward. That is, the lamp guide 410 extends in a direction crossing the plurality of lamps 300 and has a shape protruding toward the diffusion plate 330.

The lamp guide 410 provided in the reflective sheet 400 is a protrusion 410b formed by bending a portion of the reflective sheet 400 and a groove formed in the protrusion 410b to fix the plurality of lamps 300 ( 410a). Here, the protrusion 410b supports the diffusion plate 330 disposed on the plurality of lamps 300. The grooves 410a are formed in the middle region of the protrusion 410b. For example, the lamp guide 410 is formed in a sawtooth shape. The grooves 410a are preferably formed in a shape that surrounds the lamp 300 at least half in order to stably fix the lamp 300. When the contact area between the protrusion 410b and the diffuser plate 330 becomes large, a dark area is generated at the contact point. Thus, the protrusion 410b has a form in which the contact area of the diffuser plate 330 is small.

As such, the lamp guide 410 has a flexible characteristic because the reflective sheet 400 is formed by bending a portion thereof. Therefore, although the lamp support made of PC material has a problem in that the diffusion plate 330 is worn during the vibration test, the lamp guide 410 using the reflective sheet 400 may improve the wear of the diffusion plate 330. have. In addition, since the lamp support, which is conventionally used, may be omitted by the use of the lamp guide 410 that is formed by bending the reflective sheet 400, it has an advantage of preventing additional processes and coupling failure due to the lamp support.

4 is a view for explaining a method of forming the reflective sheet shown in FIG.

1 to 4, the formation of the reflective sheet 400 defines the first bent surface 410c and the second bent surface 410d that are bent toward the space in which the plurality of lamps 300 are disposed. Next, grooves 410a for fixing the plurality of lamps 300 are formed in the first bent surface 410c and the second bent surface 410d so that the contact area with the diffuser plate 330 becomes small. Form a pattern. When the pattern is formed, the first curved surface 410c and the second curved surface 410d are bent to form the lamp guide 410. That is, the reflective sheet 400 is cut to form a pattern, and the reflective sheet 400 having the pattern is bent to form the lamp guide 410.

Here, corresponding patterns are formed on the first bent surface 410c and the second bent surface 410d. The first bent surface 410c and the second bent surface 410d may correspond to face each other to face each other, or the upper end may be connected, and the lower end may be formed in an isosceles triangle shape at predetermined intervals. In addition, two reflective sheets 400 including the first bent surface 410c and the second bent surface 410d are formed to correspond to the first bent surface 410c and the second bent surface 410d. It may be formed to face each other.

The reflective sheet 400 bent to form the lamp guide 410 is applied to the front surface of the storage container using, for example, double-sided tape. That is, the first bent surface 410c and the second bent surface 410d for forming the lamp guide 410 may be naturally formed by bonding the reflective sheet 400 to the storage container 200. The surfaces 410c and 410d may be directly bonded together.

Meanwhile, only a case in which a single lamp guide 410 is formed in the center of the reflective sheet 400 to fix the plurality of lamps 300 and supports the diffusion plate 330 is described. However, a small number of lamps 300 are grouped. In addition, the lamp guide 410 may be formed for each group. In addition, in the case of forming a plurality of lamp guides 410 may be formed by varying the formation position of each lamp guide 410. That is, the number and formation positions of the lamp guide parts 410 may be freely changed according to the number of lamps 300, the storage container 200, the display panel, and the like.

5 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention.

In the display device according to the exemplary embodiment of the present invention, since the backlight assembly has the same configuration as that shown in FIGS. 1 to 4, descriptions overlapping with those of FIGS. 1 to 4 will be omitted.

Referring to FIG. 5, the display apparatus 700 according to an exemplary embodiment of the present invention may include a backlight assembly 100 for supplying light, a display unit 500 for displaying an image, and a display unit 500 for fixing the display unit 500. Top chassis 600.

The display unit 500 includes a display panel 510 for displaying an image, data for providing a driving signal for driving the display panel 510, and gate printed circuit boards 520 and 530. The driving signals provided from the data and the gate printed circuit boards 520 and 530 are applied to the display panel 510 through the data flexible circuit film 540 and the gate flexible circuit film 550.

The data and gate flexible circuit films 540 and 550 are formed of, for example, a tape carrier package (TCP) or a chip on film (COF). In addition, each of the data and the gate flexible circuit films 540 and 550 controls data to drive the driving signal to apply the data and the driving signal provided from the gate printed circuit boards 520 and 530 to the display panel 510 at an appropriate timing. And gate driving chips 542 and 552.

The data printed circuit board 520 is disposed on the rear surface of the storage container 300 by bending the data flexible circuit film 540, and the gate printed circuit board 530 is received by bending the gate flexible circuit film 550. It is disposed on the side or the back of the container (300). Meanwhile, the gate printed circuit board 530 may be removed by integrating a function into the data printed circuit board 520.

The display panel 510 includes an array substrate 512, an opposing substrate 514 (eg, a color filter substrate) coupled to the array substrate 512, and a liquid crystal 516 interposed between the two substrates 512 and 514. do. Although not shown, a plurality of pixel portions are formed on the display panel 510 by intersecting gate lines and data lines, and each pixel portion includes a thin film transistor as a switching element, a liquid crystal capacitor and a storage capacitor electrically connected to the thin film transistor. Is formed.

In the display panel 510 having such a configuration, when power is applied to the gate terminal of the thin film transistor and the thin film transistor is turned on, an electric field is applied to the liquid crystal 516. The arrangement of the liquid crystal 516 is changed according to the intensity of the applied electric field, and the transmittance of light supplied from the backlight assembly 100 is changed according to the arrangement change of the liquid crystal 516 to display an image of a desired gray scale.

The top chassis 600 is coupled to the storage container 200 while surrounding the edge of the display panel 510 to fix the display panel 510 to the upper portion of the backlight assembly 100. The top chassis 800 prevents the display panel 510 from being damaged by an impact from the outside and prevents the display panel 510 from being separated from the backlight assembly 100.

As described above, according to the present invention, the lamp support, which is conventionally used, is omitted, and the lamp guide is formed by bending the reflective sheet, thereby fixing the plurality of lamps and supporting the diffusion plate on the upper part, thereby eliminating the lamp support. Reducing the number reduces the manufacturing process and manufacturing costs. In addition, since the diffuser plate is supported using a flexible reflective sheet, wear of the diffuser plate by the lamp guide can be improved during vibration.

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

Claims (6)

A plurality of lamps for generating light; A diffuser plate disposed on the plurality of lamps; A reflective sheet reflecting light generated from the plurality of lamps; And A portion of the reflective sheet includes a protrusion configured to be bent toward the space in which the lamps are disposed to support the diffuser plate, and a lamp guide including grooves formed in the protrusion to fix the lamps. The method of claim 1, wherein the lamp guide is And a first bent surface and a second bent surface correspondingly protruding from each other. The backlight assembly of claim 2, wherein the lamp guide has a sawtooth shape. The backlight assembly of claim 3, wherein the lamp guide is formed to cross the lamps. A display panel displaying an image; A plurality of lamps supplying light to the display panel; And And a reflector sheet having a lamp guide bent toward a space in which the lamps are arranged to fix the plurality of lamps, and reflecting light generated from the lamps. The method of claim 5, further comprising a diffusion plate disposed on the plurality of lamps to diffuse the light, And the lamp guide includes a protrusion supporting the diffusion plate and grooves formed in the protrusion to fix the lamps.

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