KR20080010194A - Liquid crystal display - Google Patents

Abstract

A liquid crystal display device capable of suppressing EMI radiated from the front side of a liquid crystal panel is provided. The liquid crystal display includes a liquid crystal panel having a ground contact pad formed at an edge thereof, an accommodating frame for supporting the liquid crystal panel, a lower accommodating container accommodating the accommodating frame and the liquid crystal panel, and a ground contact pad and a lower accommodating container electrically connected to each other. And a gasket and an upper accommodating container engaged with the lower accommodating container so as to cover the upper surface of the liquid crystal panel.

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 perspective view illustrating a liquid crystal panel included in the liquid crystal display of FIG. 1.

3 is a cross-sectional view taken along line AA ′ after assembling the liquid crystal display of FIG. 1.

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

100: liquid crystal display device 110: upper storage container

130: liquid crystal panel assembly 131: gate tape carrier package

132: data tape carrier package 133: thin film transistor array panel

134: common electrode display panel 135: printed circuit board

136: liquid crystal panel 140: backlight assembly

141: optical sheets 142: diffusion plate

143: lamp 144: reflector

145: side mold 148: lamp holder

150: storage frame 160: lower storage container

170: ground contact pad 180: gasket

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device for suppressing EMI (Electro-Magnetic Interference) radiated from the front surface of the liquid crystal panel.

Liquid crystal display is one of the most widely used flat panel displays. It consists of two substrates on which electrodes are formed and a liquid crystal layer interposed between them. The display device is applied to rearrange the liquid crystal molecules of the liquid crystal layer to control the amount of light transmitted.

Such a liquid crystal display device includes a backlight assembly that provides light passing through the liquid crystal layer. Here, the backlight assembly includes a lamp, various optical sheets, and a storage container for storing them.

As the liquid crystal display device has been improved in performance, driving frequency bands have increased, and thus, EMI shielding has emerged as an important problem. In particular, efforts are needed to efficiently remove the electromagnetic waves emitted from the front surface of the liquid crystal panel.

An object of the present invention is to provide a liquid crystal display device capable of suppressing EMI radiated from the front of the liquid crystal panel.

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

According to another aspect of the present invention, there is provided a liquid crystal display device including a liquid crystal panel having a ground contact pad formed at an edge thereof, a storage frame supporting the liquid crystal panel, the storage frame, and the liquid crystal panel. And a lower storage container, a gasket for electrically connecting the ground contact pad and the lower storage container, and an upper storage container coupled to the lower storage container so as to cover an upper surface of the liquid crystal panel.

Specific details of other embodiments are included in the detailed description and the 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 with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which 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 in detail with reference to FIGS. 1 to 3. 1 is an exploded perspective view showing a liquid crystal display according to an embodiment of the present invention. FIG. 2 is a perspective view illustrating a liquid crystal panel included in the liquid crystal display of FIG. 1. 3 is a cross-sectional view taken along line AA ′ after assembling the liquid crystal display of FIG. 1.

1 to 3, the liquid crystal display 100 generally includes a liquid crystal panel assembly 130, a backlight assembly 140, and an upper storage container 110.

The liquid crystal panel assembly 130 includes a thin film transistor array panel 133, a liquid crystal panel 136 including a common electrode display panel 134, a liquid crystal (not shown), a gate tape carrier package 131, and a data tape carrier package 132. ) And a printed circuit board 135.

The liquid crystal panel 136 includes a thin film transistor array panel 133 including a gate line (not shown) and a data line (not shown), a thin film transistor array, a pixel electrode, and the like, a black matrix, a common electrode, and the like. And a common electrode display panel 134 disposed to face the thin film transistor array panel 133.

Specifically, referring to FIG. 2, a ground contact pad 170 is formed at an edge of the liquid crystal panel 136. The ground contact pad 170 is formed on the thin film transistor array panel 133 exposed from the common electrode display panel 134 and electrically connected to the ground wire formed on the thin film transistor array panel 133. Accordingly, the ground contact pads 170 directly ground the liquid crystal panel 136 to remove electromagnetic waves emitted from the front surface of the liquid crystal panel 136. As the ground contact pad 170, a conductive bump such as Al, Cu, Au, or a combination thereof may be used.

Referring back to FIGS. 1 to 3, the gate tape carrier package 131 is connected to each gate line (not shown) formed on the thin film transistor array panel 133, and the data tape carrier package 132 is connected to the thin film transistor array panel 133. Is connected to each data line (not shown) formed in the figure.

As described above, since the gate line and the data line which are connected to the gate tape carrier package 131 and the data tape carrier package 132 are formed at the edges of the thin film transistor array panel 133, the ground contact pad 170 is connected to the gate tape carrier. It is preferable that the package 131 and the data tape carrier package 132 are formed where they are not formed. For example, the data tape carrier package 132 is connected to the first side of the thin film transistor array panel 133, and the gate tape carrier package 131 is connected to the second side adjacent to the first side. Therefore, the ground contact pad 170 may be formed on the third side facing the first side and / or the fourth side facing the second side. In addition, the present invention is not limited to the number of ground contact pads 170, and one or more ground contact pads 170 may be formed to efficiently remove electromagnetic waves.

Meanwhile, in the printed circuit board 135, various driving processes for processing both the gate driving signal and the data driving signal for inputting the gate driving signal to the gate tape carrier package 131 and the data driving signal to the data tape carrier package 132 are performed. The part is mounted.

The backlight assembly 140 includes optical sheets 141, a diffusion plate 142, a lamp 143, and a reflector plate 144.

The lamp 143 may be a Cold Cathode Fluorescent Lamp (CCFL), a Hot Cathode Fluorescent Lamp (HCFL), an External Electrode Fluorescent Lamp (EEFL), or the like. The lamp 143 generates light by a lamp driving voltage applied to the lamp 143 from the outside. In addition, the lamps 143 may be spaced apart at a uniform distance and connected in phase in parallel, and may be configured in a direct type. The lamp 143 is preferably arranged in the transverse direction with respect to the liquid crystal panel 136 so that the distribution of the discharge gas inside the lamp 143 is constant to obtain uniform luminance.

The lamp holder 148 is positioned at both ends of the lamp 143 and supports and fixes the lamp 143. Here, the lamp holder 148 may include voltage applying means (not shown) for transferring a lamp driving voltage provided from the outside to the electrode of the lamp 143.

In the present exemplary embodiment, the lamp 143 is used as the light source of the liquid crystal display 100, but the present invention may use a light emitting diode (LED) as a light source instead of the lamp 143.

The diffusion plate 142 may be installed on the upper part of the lamp 143, and serves to improve luminance uniformity of the light generated by the lamp 143. That is, the diffusion plate 142 allows the light emitted from the lamp 143 to face the front surface of the liquid crystal panel 136 and to be incident at a wide range of angles. The diffusion plate 142 may be formed by coating a light diffusion member on both surfaces of a transparent film such as an acrylic resin.

The reflection plate 144 is installed under the lamp 143 to reflect the light emitted to the bottom of the lamp 143 to the top. The reflective plate 144 may be integrally formed on the bottom surface of the lower receiving container 160. That is, the lower receiving container 160 may be made of a material having high reflectivity such as aluminum (Al) or an aluminum alloy so that the lower receiving container 160 may perform a function of the reflecting plate 144.

The optical sheets 141 are installed on the diffusion plate 142 and serve to diffuse and collect light transmitted from the lamp 143. The optical sheets 141 include a diffusion sheet, a first prism sheet, a second prism sheet, and the like.

In this case, the diffusion sheet is positioned above the lamp 143 and serves to improve brightness and uniformity of light incident from the lamp 143.

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. For example, a brightness enhancement film (BEF) may be used as the first prism sheet.

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. For example, a dual brightness enhancement film (DBEF) may be used as the second prism sheet. However, if only the first prism sheet can sufficiently secure the luminance and the viewing angle, the second prism sheet may be excluded.

The backlight assembly 140 includes an accommodating frame 150 and a lower accommodating container 160 accommodating the optical sheets 141, the diffusion plate 142, the lamp 143, and the reflecting plate 144.

The liquid crystal panel 136 is installed on the optical sheets 141 and is supported by the storage frame 150 and seated in the lower storage container 160. The storage frame 150 is formed of sidewalls formed along an edge of a rectangular shape, and has a structure capable of supporting the liquid crystal panel 136 by forming a stepped portion or a protrusion on an inner wall thereof. The lower storage container 160 has a rectangular shape and sidewalls are formed along the edge of the upper surface such that the optical sheets 141, the diffusion plate 142, the lamp 143, the reflective plate 144, and the liquid crystal panel 136 are formed in the sidewalls. Accepts and fixes the role. The lower accommodating container 160 also prevents the plurality of optical sheets 141 from bending. The printed circuit board 135 of the liquid crystal panel assembly 130 is bent along the outer wall of the lower housing 160 to be seated on the sidewall or the rear surface of the lower housing 160. Herein, according to the method of accommodating the optical sheets 141, the optical plate 142, the lamp 143, the reflecting plate 144, or the liquid crystal panel assembly 130 in the lower storage container 160, The shape may be variously modified.

When the liquid crystal panel 136 is supported by the storage frame 150 and is seated in the lower storage container 160, the ground contact pad 170 and the lower storage container 160 formed at the edge of the liquid crystal panel 136 may be electrically connected. A gasket 180 connecting to the wall is attached to the outer wall of the storage frame 150. The gasket 180 may be made of a flexible material having conductivity and freely deforming its shape. For example, the gasket 180 may be a conductive elastomer or a tape coated with a conductive material. Therefore, electromagnetic waves radiated from the front surface of the liquid crystal panel 136 may escape to the lower storage container 160 via the ground contact pad 170 and the gasket 180, thereby suppressing EMI. The lower storage container 160 may be formed of a conductive material such as a chassis.

When the reflecting plate 144, the lamp 143, and the lamp holder 148 are accommodated in the lower storage container 160, the side mold 145 may be coupled to both ends of the lamp 143 so that the lamp 143 and the lamp holder 148 may be provided. ) Is fixed in the lower storage container 160.

In addition, the upper accommodating container 110 is disposed to be coupled to the lower accommodating container 160 to cover an upper surface of the liquid crystal panel assembly 130 accommodated in the lower accommodating container 160. A window for exposing the liquid crystal panel assembly 130 to the outside is formed on an upper surface of the upper accommodating container 110.

The upper storage container 110 may be fastened to the lower storage container 160 through hook coupling (not shown) and / or screw coupling (not shown). In addition, the combination of the upper storage container 110 and the lower storage container 160 may be modified in various forms.

When the upper storage container 110 is coupled to the lower storage container 160, a gasket 180 is interposed between the upper storage container 110 and the lower storage container 160, and the gasket 180 is formed in the upper storage container ( 110 may also be contacted. Accordingly, electromagnetic waves emitted from the front surface of the liquid crystal panel 136 may also escape to the upper storage container 110 via the ground contact pad 170 and the gasket 180. Here, the upper storage container 110 may be made of a conductive material such as a chassis.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments, but can be manufactured in various forms, and the general knowledge in the art to which the present invention pertains. Those skilled in the art will appreciate that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

As described above, according to the liquid crystal display according to the present invention, EMI can be effectively suppressed by directly grounding the ground contact pad formed on the liquid crystal panel to the upper storage container or the lower storage container.

Claims (11)

A liquid crystal panel having a ground contact pad formed at an edge thereof; An accommodating frame for supporting the liquid crystal panel; A lower housing container for storing the storage frame and the liquid crystal panel; A gasket electrically connecting the ground contact pad and the lower storage container; And And an upper accommodating container coupled to the lower accommodating container so as to cover an upper surface of the liquid crystal panel. According to claim 1, The liquid crystal panel includes a thin film transistor array panel on which a thin film transistor array is formed, and a common electrode panel on which a common electrode is formed and coupled to face the thin film transistor array panel, And the ground contact pad is formed at an edge of the thin film transistor array panel exposed from the common electrode display panel. The method of claim 2, And the ground contact pad is electrically connected to a ground line on the thin film transistor array panel. The method of claim 2, A data tape carrier package is connected to a first side of the thin film transistor array panel, A gate carrier package is connected to the second side adjacent to the first side, And the ground contact pad is formed on a third side facing the first side and / or a fourth side facing the second side. According to claim 1, The ground contact pad may include a conductive bump. The method of claim 5, The ground contact pad may include Al, Cu, Au, or a combination thereof. According to claim 1, And the gasket is attached to an outer wall of the storage frame. According to claim 1, The gasket is made of a flexible material having conductivity. The method of claim 8, The gasket comprises a conductive elastomer or a tape coated with a conductive material. According to claim 1, The gasket is in contact with the upper storage container. According to claim 1, The upper storage container and the lower storage container is a liquid crystal display device made of a chassis.

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