KR20070066116A - Liquid crystal display device - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to reinforce a coupling force between a bottom chassis and a top chassis by forming a first hook including an insertion hole at the bottom chassis and a second hook at the top chassis, inserting the second hook to the insertion hole and thus coupling the top chassis to the bottom chassis. A backlight unit(200) supplies light. An LCD panel(300) is disposed on the backlight unit and displays an image. A bottom chassis(500) includes a bottom surface and a sidewall(520) extending from an edge of the bottom surface to form a receiving space receiving the backlight unit, and a first coupling part(530) including a first hook(532) having an insertion hole opened upwardly and protruding outwardly is formed at a predetermined position of the sidewall. A top chassis(600) includes an upper surface(610) fixing an edge of the LCD panel and a coupling surface(620) extending from the upper surface in parallel with the sidewall, and a second coupling part(630) having a second hook(632) inserted into the insertion hole is formed at a predetermined position of the coupling surface.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

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

FIG. 2 is an exploded perspective view illustrating the first and second fastening parts shown in FIG. 1.

3 is an enlarged perspective view of the second fastening unit illustrated in FIG. 1.

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

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

100: liquid crystal display 200: backlight unit

300: liquid crystal display panel 500: bottom chassis

510: floor surface 520: side wall

530: first fastening portion 532: first hook portion

534: insertion hole 600: top chassis

610: upper surface 620: coupling surface

630: second fastening portion 632: second hook portion

634 opening

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and to a liquid crystal display device capable of improving a grounding property by strengthening a fastening force.

In general, the liquid crystal display is a flat panel display that displays an image by using the electrical and optical characteristics of the liquid crystal (Liquid Crystal) having the intermediate characteristics of liquid and solid, and is thinner, lighter, and lower than other display devices. There is an advantage of having a driving voltage and low power consumption, which is widely used throughout the industry.

The liquid crystal display device includes a liquid crystal display panel for displaying an image. The liquid crystal display panel includes a thin film transistor (TFT) substrate, a color filter substrate facing the TFT substrate, and a liquid crystal layer interposed between the substrates.

Since the liquid crystal display device is a non-light emitting device in which the liquid crystal display panel for displaying an image does not emit light by itself, a separate backlight assembly is disposed under the liquid crystal display panel to supply light to the liquid crystal display panel.

The liquid crystal display includes a bottom chassis at the bottom and a top chassis at the top to protect the LCD panel and the backlight assembly from the outside. The bottom chassis consists of a bottom surface and sidewalls extending vertically from the bottom surface to receive the backlight assembly. The top chassis consists of a top surface and a mating surface extending from the top surface in parallel with the side wall of the bottom chassis to fix the edge of the liquid crystal display panel. The top chassis is grounded while being engaged with the bottom chassis to prevent electromagnetic interference.

Conventional liquid crystal display devices are fastened by hook coupling between protrusions formed on the sidewalls of the bottom chassis and openings formed on the mating surfaces of the top chassis.

However, in the hook coupling between the bottom chassis and the top chassis, the coupling between the protrusions of the bottom chassis and the openings of the top chassis is not completely performed, and thus a phenomenon in which the bottom chassis and the top chassis are not completely grounded occurs. Due to this phenomenon, deviations with respect to electromagnetic waves are generated, which adversely affects display quality.

Accordingly, the present invention has been made in view of the above problems, and the present invention provides a liquid crystal display device capable of improving a grounding ability by strengthening a fastening force.

The LCD according to an aspect of the present invention includes a backlight unit, a liquid crystal display panel, a bottom chassis, and a top chassis. The backlight unit supplies light to the liquid crystal display panel. The liquid crystal display panel is disposed on the backlight unit to display an image. The bottom chassis includes a bottom surface and a side wall extending from an edge of the bottom surface to form an accommodation space for accommodating the backlight unit. The bottom chassis protrudes in an outward direction with an insertion opening opened upwardly at a predetermined position of the side wall. A first fastening portion having a first hook portion is formed. The top chassis includes an upper surface fixing an edge of the liquid crystal display panel and a coupling surface extending in parallel with the sidewall from the upper surface, and having a second hook portion inserted into the insertion hole at a predetermined position of the coupling surface. The second fastening portion is formed.

According to the liquid crystal display device, the bottom chassis and the top chassis are fastened in a structure in which the second hook portion formed in the second fastening portion of the top chassis is inserted into the insertion hole of the first hook portion formed in the first fastening portion of the bottom chassis. It can be strengthened to improve grounding ability.

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 liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the liquid crystal display device 100 according to an exemplary embodiment of the present invention includes a backlight unit 200, a liquid crystal display panel 300, a bottom chassis 500, and a top chassis 600.

The backlight unit 200 may include a lamp 210 for generating light, a light guide plate 220 disposed at a side of the lamp 210, and guide the light generated from the lamp 210 to the liquid crystal display panel 300. ) Includes a reflective sheet 230 disposed below the optical sensor 240 and an optical sheet 240 disposed above the light guide plate 220.

The lamp 210 generates light in response to the driving power applied from the outside. At least one lamp 210 is disposed at both sides of the light guide plate 220 corresponding to the long side of the light guide plate 220. Alternatively, the lamp 210 may be disposed on one side of the light guide plate 220.

The lamp 210 is formed of a cold cathode fluorescent lamp (CCFL) having an elongated cylindrical shape. In contrast, the lamp 210 may be formed of an external electrode fluorescent lamp (EEFL) having external electrodes formed at both ends thereof.

The light guide plate 220 is made of a transparent material for guiding light incident from the lamp 210. For example, the light guide plate 220 is made of polymethyl methacrylate (PMMA).

A predetermined reflection pattern (not shown) for scattering reflection of light is formed on the bottom surface of the light guide plate 220. For example, the reflective pattern consists of a printing pattern or an uneven pattern. Light incident from the lamp 210 into the light guide plate 220 is scattered and reflected by a reflection pattern, and light exceeding a specific critical angle is emitted through the top or bottom surface of the light guide plate 220.

The reflective sheet 230 reflects light leaking to the outside through the lower surface of the light guide plate 220 and is incident to the inside of the light guide plate 220. The reflective sheet is made of a material having high light reflectance. For example, the reflective sheet 230 is made of polyethylene terephthalate (PET) material, or polycarbonate (PC) material.

The optical sheet 240 changes the path of the light emitted through the light guide plate 220 to improve the brightness characteristic of the backlight assembly. For example, the optical sheet 240 may include a diffusion sheet 242 for diffusing light, a prism sheet 244 for reflecting light, a reflective polarizing sheet 246, or the like.

The liquid crystal display panel 300 displays an image using light supplied from the backlight unit 200. The liquid crystal display panel 300 includes a first substrate 310, a second substrate 320 facing the first substrate 310, and a liquid crystal layer 330 injected between the first and second substrates 310 and 320. It includes.

The first substrate 310 is a TFT substrate in which a thin film transistor (hereinafter, referred to as TFT) as a switching element is formed in a matrix form. A data line and a gate line are respectively connected to the source terminal and the gate terminal of the TFTs, and a pixel electrode made of a transparent conductive material is connected to the drain terminal.

In the second substrate 320, RGB pixels for forming colors are formed in a thin film form. The common electrode made of a transparent conductive material is formed on the second substrate 320.

In the liquid crystal display panel 300 having such a configuration, when power is applied to the gate terminal of the TFT and the TFT is turned on, an electric field is formed between the pixel electrode and the common electrode. The arrangement of liquid crystal molecules of the liquid crystal layer 330 interposed between the first and second substrates 310 and 320 is changed by such an electric field, and the transmittance of light supplied from the backlight unit 200 is changed according to the arrangement of the liquid crystal molecules. Is changed to display an image of a desired gradation.

In addition, the liquid crystal display device 100 further includes a driving circuit unit 400 for driving the liquid crystal display panel 300.

The driving circuit unit 400 includes a data printed circuit board 410 for supplying a data driving signal to the liquid crystal display panel 300, a gate printed circuit board 420 for supplying a gate driving signal to the liquid crystal display panel 300, and data printing. And a data driving circuit film 430 connecting the circuit board 410 to the liquid crystal display panel 300, and a gate driving circuit film 440 connecting the gate printed circuit board 420 to the liquid crystal display panel 300. .

The data driving circuit film 430 and the gate driving circuit film 440 may be formed of, for example, a tape carrier package (TCP) or a chip on film (COF). Meanwhile, the gate printed circuit board 420 may be removed by forming separate signal wires on the liquid crystal display panel 300 and the gate driving circuit film 440.

The bottom chassis 500 includes a bottom surface 510 and sidewalls 420 extending from an edge of the bottom surface 510 to form a storage space for storing the backlight unit 200. The first fastening part 530 having the first hook part 532 protruding outward is formed at a predetermined position of the side wall 420. The bottom chassis 500 is made of a metal material having excellent conductivity.

 The top chassis 600 includes an upper surface 610 that fixes an edge of the liquid crystal display panel 300, and a coupling surface 620 extending in parallel with the sidewall 420 from the upper surface 610. A second fastening part 630 having a second hook part 632 inserted into the insertion hole 534 is formed at a predetermined position of the coupling surface 620. The top chassis 600 is made of the same material as the bottom chassis 500.

The first fastening part 530 and the second fastening part 630 are fastened to each other to electrically ground the top chassis 600 to the bottom chassis 500, and details thereof will be described with reference to the accompanying drawings.

2 is an exploded perspective view showing an enlarged first and second fastening parts shown in FIG. 1, FIG. 3 is an enlarged perspective view showing a second fastening part shown in FIG. 1, and FIG. 4 is a line II ′ of FIG. 1. It is a cross section which cut along.

2 to 4, the second fastening part 630 formed on the engaging surface 620 of the top chassis 600 is connected to the first fastening part 530 formed on the side wall 420 of the bottom chassis 500. By being fastened, the top chassis 600 is electrically grounded to the bottom chassis 500.

The first fastening part 530 is formed by cutting a portion from the side wall 420 to protrude in an outward direction. Since the first fastening part 530 has only a bottom end connected to the side wall 420, the upper end part has a predetermined elastic force. Due to this elastic force, the fastening state of the bottom chassis 500 and the top chassis 600 is more closely maintained.

The first fastening part 530 includes a first hook part 532 fastened to the top chassis 600. The bottom of the first hook portion 532 has a wedge shape that is in contact with the side wall 420 at a predetermined angle. Alternatively, the first hook portion 532 may be formed by opening the bottom.

The first hook portion 532 is manufactured at the same time as the bottom chassis 500 by changing the shape of the mold for manufacturing the bottom chassis 500. Alternatively, the first hook portion 532 may be formed on the side wall 520 using a press.

The first hook portion 532 includes an insertion opening 534 having an upper portion. The first fastening part 530 corresponding to the insertion hole 534 is opened. The corners of the first hook portion 532 corresponding to the upper end of the insertion hole 534 is rounded to facilitate the insertion of the second hook portion 632. In addition, the inner surface in contact with the insertion hole 534 of the first hook portion 532 is smoothly surface-treated to reduce the friction force when the second hook portion 632 is inserted, thereby making insertion easier. An inner surface of the first hook portion 532 that contacts the insertion hole 534 is, for example, polished or buffed.

The first hook portion 532 has a square pillar shape in which the bottom is inclined at a predetermined angle. The cross section of the first hook portion 532 has an insertion hole 534 is formed in the center, the one surface has an "c" shaped opening.

The second fastening part 630 includes a second hook part 632 inserted into the insertion hole 534 at a predetermined position of the coupling surface 620. The second hook portion 632 is bent in the inward direction of the coupling surface 620 and is formed to protrude in the downward direction. The end of the second hook portion 632 is formed in a wedge shape inclined at a predetermined angle so as to be easily inserted into the insertion hole 534. For example, the end of the second hook portion 632 is inclined in a direction in which an adjacent surface thereof faces the coupling surface 620. On the other hand, the opposite ends of the second hook portion 632 may be inclined in the direction of the center of the two surfaces.

The second hook portion 632 is manufactured at the same time as the top chassis 600 by changing the shape of the mold for manufacturing the top chassis 600. Alternatively, the second hook portion 632 may be formed on the coupling surface 620 using a press.

The cross section of the second hook portion 632 has substantially the same shape as the insertion hole 534 formed in the cross section of the first hook portion 532, and the cross section of the second hook portion 632 is formed in the insertion hole 534. It has a smaller area than the insertion opening 534 with a predetermined difference so as to easily insert it. The outer surface of the second hook portion 632 is smoothly surface treated to reduce the friction when inserted into the insertion hole 534 to facilitate insertion. The outer surface of the first hook portion 532 may be polished or buffed, for example.

The second fastening part 630 further includes an opening 634 in which an area corresponding to the first hook part 532 is cut. The opening 634 is produced at the same time as the top chassis 600 by changing the shape of the mold for manufacturing the top chassis 600.

The opening 634 is the same as the area where the first hook portion 532 is inserted into the opening 634 so that the first hook portion 532 is inserted when the bottom chassis 500 and the top chassis 600 are coupled to each other. Or wider with a predetermined difference. The opening 634 has a quadrangular shape corresponding to the first hook portion 532.

The edge of the opening 634 is chamfered to prevent the occurrence of foreign matters due to contact with the first hook portion 532 when coupled to the bottom chassis 500, and reduces the frictional force. For example, the edge of the opening 634 is chamfered by using abrasives such as fine sandpaper or grindstone.

As such, the bottom chassis 500 and the top chassis 600 may be formed of the top chassis 600 at the insertion hole 534 of the first hook portion 532 formed at the first fastening portion 530 of the bottom chassis 500. By fastening the structure in which the second hook portion 632 formed in the second fastening portion 630 is inserted, the fastening force may be strengthened to improve the grounding ability.

According to the liquid crystal display device, a first hook portion having an insertion opening having an upper opening is formed on the sidewall of the bottom chassis, and a second hook portion inserted into the insertion opening is formed on the coupling surface of the top chassis to insert the second hook portion into the insertion opening. In this way, the top chassis is fastened to the bottom chassis. Therefore, the tightening force of the bottom chassis and the top chassis is strengthened.

In addition, since the bottom chassis and the top chassis are electrically grounded by the first and second hook portions, such tightening force reinforcement may result in an improvement in the grounding ability.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be 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 (6)

A backlight unit for supplying light; A liquid crystal display panel disposed on the backlight unit to display an image; A first hook which includes a bottom surface and a side wall extending from an edge of the bottom surface to form an accommodation space for accommodating the backlight unit, the first hook protruding outwardly with an insertion opening opened upward at a predetermined position of the side wall; A bottom chassis in which a first fastening portion having a portion is formed; And A second fastening portion having an upper surface fixing an edge of the liquid crystal display panel and a coupling surface extending from the upper surface in parallel with the sidewall, and having a second hook portion inserted into the insertion hole at a predetermined position of the coupling surface; Liquid crystal display comprising a formed top chassis. The liquid crystal display device according to claim 1, wherein the second hook portion is formed to be bent inwardly of the coupling surface and to protrude downwardly. The liquid crystal display of claim 1, wherein a bottom end of the first hook portion is formed to be inclined at a predetermined angle. The liquid crystal display of claim 1, wherein the first fastening part is formed to be cut out from the side wall and protrude in an outward direction. The liquid crystal display of claim 1, wherein the second fastening part further comprises an opening in which an area corresponding to the first hook part is cut. The method of claim 1, wherein the backlight unit A lamp for generating light; A light guide plate disposed at a side of the lamp to guide light generated from the lamp to the liquid crystal display panel; A reflective sheet disposed under the light guide plate; And And an optical sheet disposed on the light guide plate.

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