KR20080011960A - Liquid crystal display - Google Patents

Abstract

An LCD is provided to form permeation preventing films around joining holes of a bottom chassis of a backlight assembly to prevent external particles from being permeated into an LCD panel, thereby improving the display quality. A backlight assembly includes a lamp, a reflection plate positioned below the lamp, and a bottom chassis(350) for housing the lamp and the reflection plate in a housing space, which is defined by a housing surface and a lateral surface. A plurality of joining holes(351-1,351-2,351-3,351-4) are formed in the housing surface of the bottom chassis. A plurality of permeation preventing films(360-1,360-2,360-3,360-4) are formed on the housing surface around the joining holes. An LCD panel is positioned above the backlight assembly to display an image. A printed circuit board is positioned on a rear surface of the bottom chassis, wherein the printed circuit board is joined to the joining holes of the bottom chassis through screws.

Description

Liquid crystal display

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

FIG. 2 is a bottom perspective view for explaining fastening of the bottom chassis, the printed circuit board, and the shield case of FIG. 1. FIG.

3 is a perspective view of the bottom chassis of FIG. 1.

4 is a cross-sectional view for explaining the foreign matter permeation prevention film.

(Explanation of symbols for the main parts of the drawing)

100: liquid crystal display 200: liquid crystal panel assembly

212: first display panel 214: second display panel

210: liquid crystal panel 250: printed circuit board

300: backlight assembly 310: optical sheets

320: mold frame 330: lamp

340: reflector 350: bottom chassis

360: foreign matter penetration prevention film 400: top chassis

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and to a liquid crystal display device capable of improving display quality.

The liquid crystal display device includes a liquid crystal panel assembly for displaying an image and a backlight assembly for providing light. The liquid crystal panel assembly includes a printed circuit board in which a driving circuit for processing an image signal is integrated, and the backlight assembly includes a lamp for emitting light and a bottom chassis for receiving the lamp.

The printed circuit board is positioned on the rear surface of the bottom chassis and fastened through fastening grooves and screws formed in the bottom chassis. It further includes a shield case for shielding the electromagnetic waves emitted from the printed circuit board. The shield case covers the printed circuit board and is fastened to the bottom chassis.

According to the conventional liquid crystal display device, foreign matter penetrates into the liquid crystal display device through the fastening groove, causing a lot of problems. That is, the optical sheets due to the foreign matters were broken, or the luminance was lowered, or the foreign matters were visually recognized and the display quality was lowered.

An object of the present invention is to provide a liquid crystal display device capable of improving display quality.

The technical problem of the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a liquid crystal display device including a lamp for providing light, a reflecting plate positioned below the lamp to reflect light, and extending from a storage surface and the storage surface. A bottom chassis in which the lamp and the reflecting plate are accommodated in the storage space formed on the side surface, and a fastening groove penetrating the receiving surface is formed, and a bottom chassis in which a foreign matter penetration prevention film is attached to a predetermined area on the receiving surface on which the fastening groove is formed. A backlight assembly including a backlight assembly, a liquid crystal panel positioned at an upper portion of the backlight assembly to display an image, and positioned at a rear surface of the bottom chassis and fastened to the fastening groove through a screw to display the image. It includes a printed circuit board for providing a signal for the liquid crystal panel.

Other specific details of the present invention are included in the detailed description and drawings.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms. It is provided to fully convey the scope of the invention to those skilled in the art, and the invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, a liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 4. 1 is an exploded perspective view for explaining a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a bottom perspective view for explaining fastening of a bottom chassis, a printed circuit board, and a shield case, and FIG. It is a perspective view of the bottom chassis of FIG. 1, and FIG. 4 is sectional drawing for demonstrating a foreign material penetration prevention film.

Referring to FIG. 1, the liquid crystal display 100 generally includes a liquid crystal panel assembly 200, a shield case 260, a backlight assembly 300, and a top chassis 400.

Here, the liquid crystal panel assembly 200 includes a liquid crystal panel 210, a gate driving semiconductor chip package 230, a data driving semiconductor chip package 240, and a printed circuit board 250.

The liquid crystal panel 210 includes a first display panel 212 including a gate line (not shown) and a data line (not shown), a thin film transistor array (not shown), a pixel electrode (not shown), and a black matrix (black). The second display panel 214 may include a matrix (not shown), a common electrode (not shown), and the like, and may be disposed to face the first display panel 212.

The gate tape carrier package 230 is connected to each gate line (not shown) formed on the first display panel 212, and the data tape carrier package 240 is each data line (not shown) formed on the first display panel 212. ) Is connected.

Meanwhile, in the printed circuit board 250, various driving components for providing a gate driving signal to the gate tape carrier package 230 and providing a data driving signal to the data tape carrier package 240 are mounted.

The backlight assembly 300 includes optical sheets 310, an optical plate 315, a mold frame 320, a lamp 330, a reflector 340, and a bottom chassis 350.

The optical sheets 310 are installed on the optical plate 315 and serve to diffuse and collect light transmitted from the lamp 330. The optical sheets 310 include a diffusion sheet, a first prism sheet, a second prism sheet, and the like.

The diffusion sheet is positioned above the lamp 330 and serves to improve brightness and uniformity of light incident from the lamp 330.

The first prism sheet is positioned above the diffusion sheet, and one surface of the first prism sheet has a triangular prism pattern (not shown) for condensing and emitting light diffused from the diffusion sheet and having a constant arrangement. The second prism sheet is a reflective polarizing prism sheet having a multi-layered structure positioned on the first prism sheet and condensing and polarizing light. However, if only the first prism sheet can sufficiently secure the luminance and the viewing angle, the second prism sheet may be excluded.

The optical plate 315 may be installed on the upper portion of the lamp 330, and serves to improve luminance uniformity of light generated from the lamp 330.

The mold frame 320 supports and fixes the optical sheets 310, the lamp unit 320, and the reflecting plate 330, and the top chassis 400 is positioned on the upper portion of the liquid crystal panel assembly 200. It is fastened to the chassis 350. The mold frame 320 is formed of sidewalls formed along an edge of a rectangular shape, and has a structure in which a stepped portion or a protrusion is formed on an inner wall to support the liquid crystal panel assembly 200.

The bottom chassis 350 has a rectangular shape and a sidewall is formed along the edge of the top surface to receive and fix the reflective plate 340, the lamp 330, and the liquid crystal panel assembly 200 in the sidewall.

Fastening grooves 351_1, 351_2, 351_3, and 351_4 for fastening with the printed circuit board 250 and the shield case 260 are formed in the storage surface 352 of the bottom chassis 350, and the fastening grooves 351_1, Foreign material penetration preventing films 360_1, 360_2, 360_3, and 360_4 are attached to a predetermined region on the receiving surface 352 on which 351_2, 351_3, and 351_4 are formed. The foreign material penetration prevention layer 360_1, 360_2, 360_3, 360_4 prevents foreign matter from penetrating through the fastening grooves 351_1, 351_2, 351_3, and 351_4 of the bottom chassis 350. Let's explain.

Meanwhile, the lamp 330 emits light. As the lamp 330, a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), an external electrofluorescent lamp (EEFL), or the like may be used. The lamp 330 generates light by a lamp driving voltage applied to the lamp 330 from the outside. In addition, the lamp 330 may be configured as a direct type connected in parallel with the same phase spaced apart at a uniform distance. Or it may be an edge type, if the edge type may further include a light guide plate (not shown). The lamp 330 is preferably arranged in the horizontal direction with respect to the liquid crystal panel 200 in order to obtain a uniform brightness by distributing the discharge gas inside the lamp 330.

The reflection plate 340 is installed under the lamp 330 to reflect the light emitted to the bottom of the lamp 330 to the top. The reflective plate 340 may be integrally formed on the receiving surface 352 of the bottom chassis 350. That is, the bottom chassis 350 may be formed of a material having high reflectivity such as aluminum (Al) or an aluminum alloy so that the bottom chassis 350 itself may perform the function of the reflector 340.

The bottom chassis 350 accommodates the lamp 330 and the reflector 340 in an accommodation space formed by the storage surface 352 and the side surface 354 extending from the storage surface 352. The mold frame 320 is supported by the side surface 354, and the liquid crystal panel assembly 200 supported by the mold frame 320 is also received in the bottom chassis 350.

The top chassis 400 descends from the top of the liquid crystal panel assembly 200 and is fastened to the bottom chassis 350. The top chassis 400 may be coupled to the bottom chassis 350 through hook coupling (not shown) and / or screw coupling (not shown). In addition, the combination of the top chassis 400 and the bottom chassis 350 may be modified in various forms. A window for exposing the liquid crystal panel assembly 200 to the outside is formed on an upper surface of the top chassis 400.

As illustrated in FIG. 2, the printed circuit board 250 is bent along an outer surface of the bottom chassis 350 and positioned at a rear surface of the bottom chassis 350 to be coupled to the bottom chassis 350. In addition, the shield case 260 covers the printed circuit board to shield electromagnetic waves emitted from the printed circuit board 250, and is fastened to the printed circuit board 250 and the bottom chassis 350 by a screw. Therefore, the plurality of fastening grooves 251_1, 251_2, 251_3, 251_4, 261_1, 261_2, 261_3, 261_4, 351_1, 351_2, 351_3, and 351_4 are formed in the printed circuit board 250, the shield case 260, and the bottom chassis 350. Formed.

3 and 4, each of the fastening grooves 251_1, 251_2, 251_3, 251_4, 261_1, and 261_2 of the bottom chassis 350, the printed circuit board 250, and the shield case 260. , 261_3, 261_4, 351_1, 351_2, 351_3, 351_4).

Foreign material penetration preventing films 360_1, 360_2, 360_3, and 360_4 are attached to the storage surface 352 of the bottom chassis 350. The foreign material penetration prevention layer is attached to a predetermined area where the fastening grooves 351_1, 351_2, 351_3, and 351_4 are formed, and may be attached to the entire area of the storage surface 352 of the bottom chassis 350.

Referring to FIG. 4, the portion in which the fastening groove 351 is formed is protruded in the rear direction of the bottom chassis 350 to be fastened with the screw 269, so that the foreign matter penetration preventing film 360 may receive the receiving surface of the bottom chassis 350. 352 may be attached. The foreign material penetration prevention film 360 may be composed of two layers. That is, the foreign material penetration prevention layer 360 may include an adhesive layer 362 attached to the receiving surface 352 of the bottom chassis 350 and a coating layer 364 facing the reflective plate 340.

The coating layer 364 may be the same color as the reflective plate 340. Alternatively, the foreign matter penetration prevention layer 360 may be made of a transparent material. The foreign material penetration prevention layer 360 is introduced into the backlight assembly (see 300 in FIG. 1) or the liquid crystal display (see 100 in FIG. 1) through the fastening groove (see 351_1, 351_2, 351_3, and 351_4 in FIG. 1). Prevent it.

Here, when the foreign matter penetration prevention film 360 is made of the same color as the reflective plate 340, the foreign matter penetration prevention film 360 is not visually recognized and thus the display quality is not deteriorated. In the case where the reflector 340 is not provided and the bottom chassis 350 functions as a reflector, that is, when the bottom chassis 350 is made of a material having high reflectivity such as aluminum (Al) or an aluminum alloy, a foreign material The penetration barrier 360 is preferably made of a transparent or highly reflective material.

Since the foreign matter does not penetrate through the fastening groove 351 of the bottom chassis 350, the liquid crystal display (see 100 of FIG. 1) and the optical sheets (see 310 of FIG. 1) and the optical plate (FIG. 1) by the foreign matter. (See 340), and the display quality can be improved since the deterioration of luminance is improved.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can realize that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. I can understand. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

According to the liquid crystal display according to the exemplary embodiment of the present invention as described above, the display quality can be improved by preventing foreign matter from penetrating into the liquid crystal display.

Claims (4)

The lamp and the reflecting plate are accommodated in a lamp for providing light, a reflecting plate positioned below the lamp to reflect light, and a storage space formed by a receiving surface and a side surface extending from the receiving surface, and penetrating the receiving surface. A bottom chassis having a fastening groove formed therein, the backlight assembly including a bottom chassis having a foreign matter permeation prevention film attached to a predetermined area on the receiving surface on which the fastening groove is formed; A liquid crystal panel positioned on the backlight assembly and configured to receive the light and display an image; And And a printed circuit board positioned on a rear surface of the bottom chassis and fastened to the fastening groove through a screw to provide a signal for displaying the image to the liquid crystal panel. The method of claim 1, The foreign material penetration prevention layer is the same color as the reflective plate. The method of claim 1, A pressure-sensitive adhesive is applied to one surface of the foreign matter penetration prevention film to be attached to the storage surface. The method of claim 1, The foreign material penetration preventing film includes a pressure-sensitive adhesive layer attached to the receiving surface, and a coating layer facing the reflective plate and having the same color as the reflective plate.

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