KR20070118742A - Liquid crystal display - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to enable a bottom sash to ground electromagnetic waves and prevent the electromagnetic waves from being radiated to the outside, and prevent malfunction and performance obstacle of an electronic device caused by interference of the electromagnetic waves by joining the bottom sash to a top sash in order to shield the electromagnetic waves. An LCD includes a liquid crystal panel(10), a driving circuit unit(20), a mold frame(30), a top sash(40), a backlight assembly(50), and a bottom sash(60). The liquid crystal panel displays an image. The driving circuit unit is attached to a side of the liquid crystal panel. The mold frame contains the liquid crystal panel. The top sash fixes the liquid crystal panel and covers the driving circuit unit and the mold frame. The bottom sash includes a container(61), a first support unit(63), a second support unit(65), and a shielding unit(67).

Description

Liquid crystal display {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 cross-sectional view illustrating a cross section taken along line II ′ of the LCD shown in FIG. 1.

3 is a cross-sectional view illustrating a bottom chassis coupled to a mold frame and a top chassis by a coupling member in the liquid crystal display shown in FIG. 1.

<Description of main parts of drawing>

10: liquid crystal panel 11: color filter substrate

13: thin film transistor substrate 20: driving circuit section

21: data integrated circuit 23: data tape carrier package

25: printed circuit board 30: mold frame

31: Panel mounting part 40: Top chassis

50: backlight assembly 51: lamp

53: reflective sheet 55: diffuser plate

57: prism sheet 58: protective sheet

60: bottom chassis 61: storage

63: first support 65: second support

67: shield 68, 69: first and second coupling member

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device which blocks electromagnetic waves emitted to the outside by changing the structure of a bottom chassis.

The development of electronic communication technology enables high speed and wideband electronic devices, as well as the ability to drive electronic devices with very little energy. However, these electronic devices are sensitive to the slight electromagnetic interference (EMI), causing the system to malfunction. Here, electromagnetic interference refers to a phenomenon in which the performance of another device is disturbed due to the radiation or conduction of electromagnetic waves generated by the electronic device. Therefore, in recent years, measures to solve the electromagnetic interference problem have been actively progressed in each field, and in the case of the liquid crystal display device, various methods for solving this problem have been proposed.

In general, electromagnetic interference occurs in an electronic device using a lot of high-frequency signals as electric and magnetic fields are mixed in the air when high-frequency current flows on a certain wire.

In the case of a liquid crystal display device, as the resolution increases, the operating frequency increases, and thus the amount of electromagnetic waves emitted increases. As the liquid crystal display device becomes larger, the space in which electromagnetic waves can be radiated in the liquid crystal display device increases.

Conventional liquid crystal display devices for large TVs have a printed circuit board and a non-conductive mold frame, which generate electromagnetic waves between the top chassis and the bottom chassis. The mold frame and the lower part of the printed circuit board are not shielded. Therefore, the liquid crystal display device has a structure in which electromagnetic waves are hardly prevented from being emitted below the mold frame.

The technical problem to be achieved by the present invention is to provide a liquid crystal display device that blocks the electromagnetic radiation emitted to the outside by combining the structure of the bottom chassis with the top chassis so that the lower portion of the mold frame is shielded.

In order to achieve the above technical problem, the present invention provides a liquid crystal panel for displaying an image, a driving circuit portion attached to one side of the liquid crystal panel, a mold frame for accommodating the liquid crystal panel, and fixing the liquid crystal panel to drive the liquid crystal panel. A top chassis surrounding the circuit part and the mold frame, a backlight assembly for supplying light to the liquid crystal panel, an accommodating part accommodating the backlight assembly, and an outer side of the accommodating part along one end of the accommodating part, A first support part supporting the lower part of the mold frame, a second support part formed parallel to one side of the accommodating part at an end of the first support part to support the outside of the mold frame, and extending from an end of the second support part; And a bottom chassis including a shielding portion electrically connected to the top chassis to shield electromagnetic waves. It provides a liquid crystal display device.

More specifically, it further comprises a coupling member for coupling the shield and the top chassis.

The coupling member is at least one of a hook and a screw.

Other technical problems and features of the present invention in addition to the above technical problem will be apparent through the description of the embodiments with reference to the accompanying drawings.

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

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating a cross section taken along line II ′ of the liquid crystal display of FIG. 1.

1 and 2, the present invention provides a liquid crystal panel 10 for displaying an image, a driving circuit 20 attached to one side of the liquid crystal panel 10, and a mold for accommodating the liquid crystal panel 10. A top chassis 40 for fixing the frame 30, the liquid crystal panel 10, and enclosing the driving circuit unit 20 and the mold frame 30, a backlight assembly 50 for supplying light to the liquid crystal panel 10; The accommodating part 61 accommodating the backlight assembly 50 and a first support part extending outward of the accommodating part 61 along one end of the accommodating part 61 and supporting the lower portion of the mold frame 30 are provided. (63) of the second support portion 65 and the second support portion 65 which are formed in parallel with one side of the storage portion 61 at the end of the first support portion 63 to support the outside of the mold frame 30; Provided is a liquid crystal display device having a bottom chassis 60 formed at an end and electrically connected to the top chassis 40 and including a shield 67 to shield electromagnetic waves. .

Specifically, the liquid crystal panel 10 includes a thin film transistor substrate 13 and a color filter substrate 11 facing the thin film transistor substrate 13. Liquid crystal (not shown) is injected between the thin film transistor substrate 13 and the color filter substrate 11 and the light transmittance of the liquid crystal using a thin film transistor (TFT) (not shown) formed in a matrix form as a switching element. The image is displayed by adjusting.

A gate line (not shown) is connected to a gate electrode (not shown) of the thin film transistor, a data line (not shown) is connected to a source electrode (not shown), and a pixel electrode (not shown) is connected to a drain electrode (not shown). Is connected. The color filter substrate 11 is formed with color pixels for displaying an image. Therefore, the light transmitted through the liquid crystal is expressed in a predetermined color through the pixel to implement the image.

The driving circuit unit 20 is attached to the thin film transistor substrate 13 and electrically connected to the thin film transistor substrate 13 by a data tape carrier package 23 in which a data integrated circuit 21 for driving data lines is mounted. do. The driving circuit unit 20 includes a printed circuit board 25 mounted with a plurality of electronic components (eg, a timing controller, a resistor, a capacitor, an inductor, etc.) to drive the liquid crystal panel 10. In addition, a gate integrated circuit (not shown) for driving the gate line is also electrically connected to the thin film transistor substrate 13 by a gate tape carrier package (not shown).

The mold frame 30 includes a panel seating portion 31 on which the liquid crystal panel 10 is mounted. The mold frame 30 accommodates the liquid crystal panel 10 to prevent flow and absorbs external shocks applied to the liquid crystal panel 10. In addition, the mold frame 30 is formed of a non-conductive material such as synthetic resin or plastic to insulate the driving circuit unit 20.

The backlight assembly 50 that supplies light to the liquid crystal panel 10 includes a plurality of lamps 51 for generating light and a reflection sheet 53 for reflecting light supplied from the lower part of the lamp 51 to the upper part of the lamp 51. ), A diffuser plate 55 for scattering and diffusing the light supplied by the lamp 51, and a prism sheet 57 and a prism sheet for condensing the light diffused through the diffuser plate 55 to improve luminance. 57 is formed on top of the protective sheet 58 to protect the sheets against dust or scratches and to prevent the sheets from flowing.

The backlight assembly 50 is accommodated in the bottom chassis 60.

The bottom chassis 60 includes an accommodating part 61 accommodating the backlight assembly 50, a first support part 63 extending outwardly of the accommodating part 61 along one end of the accommodating part 61, and A shielding part extending from the end of the second support part 65 and the second support part 65 formed in parallel with one side of the accommodating part 61 at the end of the first support part 63 and coupled to the top chassis 40. (67) is provided.

The accommodating part 61 attaches the reflective sheet 53 using an adhesive member. The accommodating portion 61 accommodates the lamp 51, the diffusion plate 55, the prism sheet 57, and the protective sheet 58 on the reflective sheet 53. In this case, the accommodating part 61 includes a flat plate formed in parallel with the liquid crystal panel 10, and sidewalls formed on both sides of the flat plate to be perpendicular to the flat plate.

The first support part 63 is formed outwardly of the accommodating part 61 along the end of the side wall formed on one side of the accommodating part 61, and the second support part 65 extends from the end of the first support part 63. It is formed in parallel with one side wall of the housing 61. Here, the first and second support parts 63 and 65 support the mold frame 30 and prevent the flow of the mold frame 30.

The shield 67 is formed by extending outward from the second support 65 at the end of the second support 65. In addition, the shield 67 is coupled to the top chassis 40. The shield 67 is coupled to the top chassis 40 to shield between the bottom chassis 60 and the top chassis 40. Through this, the shield 67 prevents the electromagnetic wave generated from the driving circuit unit 20 to be radiated to the outside.

The top chassis 40 is formed to surround the liquid crystal panel 10, the driving circuit unit 20, and the mold frame 30 on the upper portion of the liquid crystal panel 10 and is connected to the shielding part 67.

The top chassis 40 fixes the liquid crystal panel 10 and prevents damage to the liquid crystal panel 10 and the driving circuit unit 20 from external impact. In this case, the top chassis 40 is formed of a conductive material together with the bottom chassis 60 and electrically connected thereto. Thus, the top chassis 40 and the bottom chassis 60 ground the electromagnetic waves to block the electromagnetic waves radiated to the outside.

3 is a cross-sectional view illustrating a bottom chassis coupled to a mold frame and a top chassis by a coupling member in the liquid crystal display shown in FIG. 1.

Referring to FIG. 3, in contrast to the liquid crystal display shown in FIG. 2, the present invention provides a first coupling member 68 for coupling the bottom chassis 60 and the mold frame 30 to the bottom chassis 60. It has the same components except that it further includes a second coupling member 69 for coupling the top chassis 40. Therefore, detailed description of the same components will be omitted.

Specifically, the bottom chassis 60 is coupled to the mold frame 30 using the first coupling member 68 to the second support 65 to prevent the flow of the mold frame 30. At this time, the second support portion 65 and the mold frame 30 are coupled using a screw.

A hook may be formed on the second support part 65, and a groove may be formed on the mold frame 30 to be coupled. On the contrary, a groove may be formed in the second support part 65 and a hook may be formed in the mold frame 30 to be coupled.

The first coupling member 68 firmly fixes the mold frame 30 to the bottom chassis 60 to prevent the mold frame 30 from being separated from the bottom chassis 60 when the liquid crystal display is transported later.

The shielding part 67 forms an end side by side with the top chassis 40 and is coupled to the top chassis 40 with the second coupling member 69. At this time, the end of the shield 67 and the top chassis 40 is coupled with a screw. In addition, a hook is formed at the end of the shield 67, and a groove is formed in the top chassis 40 to be coupled. On the contrary, a groove is formed at the end of the shield 67, and a hook is formed at the top chassis 40 to be coupled.

Here, the shield 67 may be coupled to the top chassis 40 inside the top chassis 40. In addition, the shield 67 may be coupled to the top chassis 40 on the outside of the top chassis 40.

At this time, the second coupling member 69 is firmly fixed between the bottom chassis 60 and the top chassis 40 so as to prevent the play of electromagnetic waves radiating to the outside. Therefore, the second coupling member 69 seals between the bottom chassis 60 and the top chassis 40 to block electromagnetic waves radiated to the outside.

The second coupling member 69 electrically connects the bottom chassis 60 and the top chassis 40 to ground electromagnetic waves.

As described above, in the liquid crystal display according to the present invention, the bottom chassis and the top chassis are electrically connected to each other to shield electromagnetic waves. Therefore, the bottom chassis grounds electromagnetic waves to prevent them from radiating to the outside and prevents malfunction and performance failure of electronic devices due to electromagnetic interference.

In addition, the top chassis and the bottom chassis are fastened to the mold frame and the top chassis to prevent flow of the liquid crystal panel and the backlight assembly and to prevent damage from external impact. Thus, a defect caused by damage in the liquid crystal display device can be prevented.

Although the detailed description of the present invention described above has been described with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art, those skilled in the art, described in the claims below It will be understood that various modifications and changes can be made in the present invention without departing from the spirit and scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (3)

A liquid crystal panel which displays an image; A driving circuit unit attached to one side of the liquid crystal panel; A mold frame accommodating the liquid crystal panel; A top chassis fixing the liquid crystal panel and surrounding the driving circuit unit and the mold frame; A backlight assembly supplying light to the liquid crystal panel; An accommodating part accommodating the backlight assembly, a first support part formed to extend outwardly of the accommodating part along one end of the accommodating part, and supporting a lower portion of the mold frame, and an accommodating part at an end of the first supporting part A bottom chassis including a second support part formed parallel to one side and extending from an end of the second support part and extending from an end of the second support part, and a shield part electrically connected to the top chassis to shield electromagnetic waves; Liquid crystal display device characterized in that. The method of claim 1, And a coupling member for coupling the shield and the top chassis. The method of claim 2, The coupling member is at least one of a hook and a screw.

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