KR20070079182A - Liquid crystal display - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to prevent a leakage current and improve the brightness by disposing a lamp wire and a bottom chassis such that they are spaced by a predetermined interval and maintaining the interval. A liquid crystal display panel(210) displays an image. A backlight assembly(300) includes a lamp(311) that provides a light to the liquid crystal display panel and a lamp wire(313) that transmits power to the lamp. An opening(421) supports and receives the backlight assembly. The lamp wire is drawn out to a rear surface through the opening. A support guide supports and guides the lamp wire drawn out through the opening and separates the lamp wire from the rear surface. An inverter is electrically connected to the lamp wire on the rear surface and supplies the power to the lamp.

Description

Liquid crystal display

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

2 is a perspective view of a support guide included in a liquid crystal display according to an exemplary embodiment of the present invention.

3 is a perspective view partially illustrating a rear surface of a liquid crystal display according to an exemplary embodiment of the present invention.

4 is a perspective view of a support guide included in a liquid crystal display according to another exemplary embodiment of the present invention.

5 is a perspective view partially illustrating a rear surface of a liquid crystal display according to another exemplary embodiment of the present invention.

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

310: lamp unit 311: lamp

313: lamp wire 420: bottom chassis

421: opening 360, 370: support guide

361, 371: support fixing part 362: hole

363, 372: spacing 364, 373: groove

600: inverter

TECHNICAL FIELD The present invention relates to a flat panel display, and more particularly, to a liquid crystal display.

The liquid crystal display device includes, for example, a liquid crystal display panel including a liquid crystal layer filled with liquid crystal molecules to a predetermined thickness between two transparent insulating substrates, and a backlight assembly for providing light to the liquid crystal display panel. Such a liquid crystal display device is a display device that displays an image by changing an arrangement of liquid crystal molecules according to a voltage change applied to a liquid crystal display panel, and changing transmittance of light provided from the backlight assembly to the liquid crystal display panel.

In recent years, as the size of liquid crystal displays increases, the light source of the backlight assembly has been changed and applied to a direct type structure including a plurality of fluorescent lamps. In the case of the direct backlight assembly, as the distance between the lamp wire for supplying power to the lamp and the lower housing member made of metal approaches, the parasitic capacitance increases to increase the leakage current. This leakage current results in a reduction in tube current that affects the brightness characteristics of the lamp.

It is an object of the present invention to provide a liquid crystal display device having a structure in which generation of a leakage current is suppressed.

Technical problems of the present invention are not limited to the technical problems 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, a liquid crystal display device includes a liquid crystal display panel displaying an image, a lamp providing light toward the liquid crystal display panel, and a lamp wire transferring power to the lamp. A lower housing member including a backlight assembly, an opening for supporting and receiving the backlight assembly, an opening for drawing the lamp wire to the back, guide and support the lamp wire drawn through the opening, and supporting the back and the lamp wire. And a support guide spaced apart from the backside and an inverter electrically connected to the lamp wire to supply the power to the lamp.

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 may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. 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.

The spatially relative terms " below ", " beneath ", " lower ", " above ", " upper " It may be used to easily describe the correlation of a device or components with other devices or components. Spatially relative terms are to be understood as including terms in different directions of the device in use or operation in addition to the directions shown in the figures. For example, when flipping a device shown in the figure, a device described as "below or beneath" of another device may be placed "above" of another device. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be oriented in other directions as well, in which case spatially relative terms may be interpreted according to orientation.

Hereinafter, a liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is an exploded perspective view of a liquid crystal display according to an embodiment of the present invention, FIG. 2 is a perspective view of a support guide included in the liquid crystal display according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. A perspective view partially showing the back of the liquid crystal display according to the example.

As illustrated in FIG. 1, the liquid crystal display device 100 includes a liquid crystal display panel assembly 200 for displaying an image and a backlight assembly 300 for providing light to the liquid crystal display panel assembly 200.

The liquid crystal display panel assembly 200 includes a liquid crystal display panel 210, a data printed circuit board 220, a gate printed circuit board 230, a data side TCP 240, and a gate side TCP 250.

The liquid crystal display panel 210 implements a screen, and includes a first display panel 211, a second display panel 213 facing the first display panel 211, a first display panel 211, and a second display panel 213. It consists of a liquid crystal (not shown) arrange | positioned between and. Here, the first substrate 211 is a transparent glass substrate in which a thin film transistor (not shown) which is a switching element is formed in a matrix form. A data line and a gate line are respectively connected to the source and gate terminals of the thin film transistor, and a pixel electrode (not shown) made of indium tin oxide or indium zinc oxide of a transparent conductive material is disposed at the drain terminal.

The second display panel 213 facing the first display panel 211 is, for example, a display panel in which red, green, and blue pixels, which are color pixels expressed in a predetermined color by light passing through, are formed by a thin film process. A common electrode made of indium tin oxide or indium zinc oxide is disposed on the front surface of the second display panel 213.

The data line formed on the liquid crystal display panel 210 is electrically connected to the data printed circuit board 220 through the data side TCP 240, and the gate line is connected to the gate printed circuit board through the gate side TCP 250. 230 is electrically connected. Accordingly, the data and gate printed circuit boards 220 and 230 which receive an electric signal from the outside transmit a driving signal and a timing signal for controlling the driving and driving timing of the liquid crystal display panel assembly 200. The signals are transferred to the gate line and the data line through 240 and 250, respectively.

Meanwhile, the backlight assembly 300 may include one or more lamp units 310 generating light, a diffuser plate 330 for diffusing light from the lamp unit 310, and a lamp reflector plate for reflecting light to the diffuser plate 330. 320.

The lamp unit 310 may include a lamp 311 that emits light, a lamp lead (not shown) provided at an end of the electrode portion of the lamp 311, and a power source connected to the lamp lead to be applied to the lamp 311. Lamp wire 313 to transmit. An inverter (600 in FIG. 2) that applies power to the lamp 311 of the lamp unit 310 is electrically connected to the lamp unit 310 by a lamp wire 313. In the present specification, an eight-equal direct type liquid crystal display having eight lamp units 310 is illustrated. However, the present invention is not limited thereto, and the number of lamp units 310 may be variously changed and applied.

The diffusion plate 330 diffuses the first light generated from the lamp 311 of the lamp unit 310 to emit the second light having a uniform luminance distribution. A part of the first light generated from the lamp 311 is directly incident to the diffuser plate 330, and the other part is reflected toward the diffuser plate 330 through the lamp reflector 320. The first light is diffused by the diffusion plate 330 and is emitted as the second light having a wide range of angles.

The liquid crystal display panel assembly 200 and the backlight assembly 300 as described above are accommodated in the housing member. The housing member includes a bottom housing member including a bottom morph frame 410 and a bottom chassis 420, and an upper housing member including an upper mold frame 430 and a top chassis 440.

The bottom mold frame 410 is formed in a rectangular tee shape, and the sidewall surface parallel to the longitudinal direction of the lamp 311 is inclined at a predetermined angle. In addition, a jaw in which the diffusion plate 330 is seated is formed at an upper end of the side wall surface 341. In addition, although not specifically illustrated in the drawings, the sidewall surface of the bottom mold frame 410 is provided with fixing parts (not shown) that are engaged with both ends of the lamp 311. Specifically, in order to arrange the lamps 311 spaced at predetermined intervals, fixing parts spaced at predetermined intervals are formed on the sidewall surface of the bottom mold frame 410. The lamp 311 is inserted and fixed to the fixing part.

On the other hand, the bottom chassis 420 is composed of a bottom surface and sidewalls extending from the bottom surface, the top surface is formed in the form of a box of rectangular parallelepiped opened. A predetermined opening 421 may be formed in the bottom surface of the bottom chassis 420 so that the lamp wire 313 of the lamp unit 310 may be drawn out to the rear surface. In this case, the size of the opening 421 is not particularly limited as long as the size of the lamp wire 313 can pass therethrough, and the number of the openings 421 is not particularly limited, but is the number of the lamp units 310. It may be provided on the bottom surface of the low bottom chassis 420. In addition, a storage space having a predetermined depth is formed inside the bottom chassis 420, a lamp reflecting plate 320 is installed in the storing space, and a lamp 311 is disposed above the lamp reflecting plate 320.

In addition, a support guide for guiding and supporting the lamp wire 313 drawn out to the rear surface of the bottom chassis 420 through the bottom surface of the bottom chassis 420 on the rear surface of the bottom chassis 420 ( support guide 360 is disposed.

Referring to FIG. 3, the support guide 360 will be described in more detail. The support guide 360 fixes a support guide 360 to the rear surface of the bottom chassis 420 and a hole for drawing out the lamp wire 313. The support fixing part 362 including the 361 and the lamp wire 313 includes a spacing protrusion 363 so as to be spaced apart from the rear surface of the bottom chassis 420 by a predetermined interval. The height of the separation protrusion 363 is not particularly limited, but may be selected in a range such that the thickness of the liquid crystal display device is not too thick. The spacing protrusion 363 is provided with a groove 364 to allow the lamp wire 313 to be fixed, for example to be fitted into a defect.

The support guide 360 is an insulating material, for example, polyterephthalate, polystyrene, polyethylene, polypropylene, polyester, polyacryl, etc., unlike the bottom chassis 420 made of a conductive material, for example, stainless steel or aluminum. It can be made of plastic.

Referring again to FIG. 2, the support guide 360 overlaps the opening (421 in FIG. 1) of the bottom surface of the bottom chassis 420, but the size of the support fixing portion 365 of the support guide 360 is at least the bottom. It has a size larger than the size of the opening in the bottom surface of the chassis 420 (421 in FIG. 1). Accordingly, the lamp wire 313 is led out from the bottom surface of the bottom chassis 420 to the back through the opening of the bottom chassis 420 (421 in FIG. 1), and the drawn lamp wire 313 is opened from the opening ( It exits through the hole 361 of the support guide 360 positioned to overlap with 421 of FIG. 1. After the lamp wire 313 exited through the hole 361 is fixed to, for example, a groove 364 positioned above the spaced protrusion 363 of the support guide 360, the bottom chassis 420 is fixed thereto. It is electrically connected to the inverter 600 located on the back of the bottom surface. Although not specifically illustrated in the drawings, the support guide 360 may be fixed to a rear surface of the bottom surface of the bottom chassis by fixing means, for example, a screw.

As described above, the lamp wire 313 is fixed to the support guide 360 and spaced apart from the rear surface of the bottom chassis 420 by a predetermined distance or more. Therefore, the leakage current generated by the parasitic capacitance increase due to the decrease in the distance between the lamp wire 313 and the bottom chassis 420 is suppressed. Therefore, the luminous efficiency of the backlight assembly due to the leakage current can be prevented from being lowered. In addition, since the lamp wires 313 of all the lamp units 310 have substantially the same distance from the bottom chassis 420, the lamp wires 313 of each lamp unit 310 are different from the bottom chassis 420. It is possible to suppress an increase in leakage current due to different parasitic capacitances generated at a distance from each other. For example, when the support guide 360 as described above is applied to a liquid crystal display having a 27-inch display screen, the luminance improvement of about 20 to 40 nit can be confirmed at the 430 nit luminance.

When the lamp unit 310 and the diffusion plate 330 are sequentially received in the lower housing member including the bottom morph frame 410 and the bottom chassis 420, the upper mold frame 430 is provided thereon. The upper mold frame 430 fixes the diffusion plate 330 to the bottom mold frame 410. That is, the upper mold frame 430 has a rectangular band shape in which a seating surface protruding from the inner wall is formed. At this time, the upper mold frame 430 interviews the diffusion plate 330 to press the diffusion plate 330 toward the bottom mold frame 410. In addition, the liquid crystal display panel 210 is mounted on the mounting surface of the upper mold frame 430.

A top chassis 440 having a cramped shape with upper and lower surfaces opened is provided on the liquid crystal display panel 210. The top chassis 440 is coupled to the bottom chassis 420 to fix the liquid crystal display panel 210 to the bottom chassis 420. Here, the top chassis 440 and the bottom chassis 420 may be coupled by a hook or a screw. This structure is a coupling structure used in the related art, and a detailed description of the coupling structure of the top chassis 440 and the bottom chassis 420 will be omitted.

Hereinafter, a liquid crystal display according to another exemplary embodiment of the present invention will be described with reference to FIGS. 4 and 5. 4 is a perspective view of a support guide included in a liquid crystal display according to another exemplary embodiment of the present invention, and FIG. 5 is a perspective view partially illustrating a rear surface of the liquid crystal display according to another exemplary embodiment of the present invention. Since the liquid crystal display according to another exemplary embodiment of the present invention is substantially the same as the liquid crystal display according to the exemplary embodiment of the present invention except for the support guide, a redundant description is omitted and the liquid crystal according to the exemplary embodiment of the present invention is omitted. The difference with a display apparatus is demonstrated.

As shown in FIG. 4, the bottom of the bottom chassis 420 has a lamp wire 313 drawn out to the bottom of the bottom chassis 420 through the bottom surface of the bottom chassis 420 as shown in FIG. 2. Supporting guides 360, 370 for guiding are arranged.

As illustrated in FIG. 4, support guides 360 and 370 are disposed on the rear surface of the bottom chassis 420 to guide and support the lamp wire 313 to the rear surface of the bottom chassis 420. The support guides 360 and 370 are positioned on the first support guide 360 and the inverter 600, which overlap each other with an opening (421 in FIG. 1) of the bottom surface of the bottom chassis 420. Guide 370. Since the first support guide 360 is the same as the support guide 360 in the liquid crystal display according to the exemplary embodiment of the present disclosure, duplicate description thereof will be omitted.

Referring to FIG. 5, the second support guide 370 will be described in more detail. The second support guide 370 is a support fixing part 371 that fixes the second support guide 370 to the bottom of the bottom chassis 420. ) And the lamp wire 313 may be spaced apart from the rear surface of the bottom chassis 420 by a spaced apart projection 372. The height of the spacing protrusion 371 may be substantially the same height as the spacing protrusion 362 of FIG. 4 of the first support guide 360 (FIG. 4), or may be higher. The spacing protrusion 372 is provided with a groove 373 to allow the lamp wire 313 to be fixed, for example to be fitted into a defect. The second support guide 370 is an insulating material, for example, polyterephthalate, polystyrene, polyethylene, polypropylene, polyester, poly, unlike the bottom chassis 420 made of a conductive material, for example, stainless steel or aluminum. It may be made of plastic such as acrylic.

The second support guide 370 serves to support and fix the lamp wire 313 once again drawn out to the rear surface of the bottom chassis 420 and fixed by the first support guide 360. Even though the lamp wire 313 is guided and fixed by the first support guide 360 to be spaced apart from the bottom chassis 420 by a predetermined distance, the lamp wire 313 is connected to the inverter (see FIG. 4) in the first support guide 360. The distance to the bottom chassis 420 may be reduced toward the side 600. In this case, leakage current may occur due to an increase in parasitic capacitance due to a decrease in the distance between the lamp wire 313 and the bottom chassis 420. Thus, the second support guide 370 continues until the ramp wye 313 spaced a predetermined distance from the bottom chassis 420 by the first support guide (360 in FIG. 4) until the interlock (600 in FIG. 4). In order to maintain a predetermined distance from the bottom chassis 420.

Referring back to FIG. 4, the first support guide 360 is moved out through the hole 361 of the first support guide 360 positioned to overlap the opening (421 of FIG. 1) of the bottom chassis 420. The lamp wire 313, which is fitted and fixed to the groove 364 positioned at the upper portion of the spaced protrusion 363, is continuously positioned at the top of the spaced protrusion 370 of the second support guide 370. 372, for example, is then electrically coupled with the inverter 600. Although not specifically illustrated in the drawings, the first and second support guides 360 and 370 may be fixed to the rear surface of the bottom chassis by fixing means, for example, screws or the like.

As described above, the lamp wire 313 is fixed to the first and second support guides 360 and 370 and spaced apart from the rear surface of the bottom chassis 420 by a predetermined distance or more. Therefore, as in the liquid crystal display according to the exemplary embodiment of the present invention, the leakage current generated by the parasitic capacitance increase can be suppressed, and thus the luminous efficiency due to the leakage current can be prevented from being lowered.

Although 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 may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

In the liquid crystal display according to the present invention as described above, by causing the lamp wire and the bottom chassis to be spaced apart from each other at a predetermined interval, the occurrence of leakage current is suppressed, and as a result, the luminance is improved.

Claims (8)

A liquid crystal display panel displaying an image; A backlight assembly including a lamp for providing light toward the liquid crystal display panel and a lamp wire for transmitting power to the lamp; A lower accommodating member supporting and accommodating the backlight assembly, the lower accommodating member including an opening through which the lamp wire is led out; A support guide for guiding and supporting the lamp wire drawn out through the opening and separating the lamp wire from the rear surface; And And an inverter electrically connected to the lamp wire at the rear surface to supply the power to the lamp. The method of claim 1, The support guide is provided with a support fixing part fixed to the back, the support fixing part, the separation protrusion having a hole for drawing out the lamp wire, protruding from the support fixing part, and having a groove for fixing the lamp wire. Liquid crystal display comprising a. The method of claim 2, And the support fixing part is positioned to overlap the opening at the rear surface, and is larger than the size of the opening. The method of claim 2, The support guide is a liquid crystal display device made of an insulating material. The method of claim 1, The support guide may include a first support fixing part fixed to the rear surface, a first support fixing part, a hole for drawing out the lamp wire, protruding from the first support fixing part, and fixing the lamp wire. A first support guide including a first spacing protrusion having a first groove, a second support fixing portion fixed to the rear surface, a second projecting portion protruding from the second support fixing portion, and capable of fixing the lamp wire; And a second support guide including a second spacing protrusion having a groove. The method of claim 5, The fixing part of the first supporting guide is positioned to overlap the opening on the rear surface, and is larger than the size of the opening. The method of claim 5, The second support guide is positioned between the first support guide and the inverter. The method of claim 5, And the first and second support guides are made of an insulating material.

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