KR20060028882A - Liquid crystal display device - Google Patents

Abstract

The liquid crystal display device of the present invention comprises a liquid crystal panel; A backlight unit; A cover bottom accommodating the liquid crystal panel and the backlight unit therein; An inverter positioned on a rear surface of the cover bottom and having a transformer; And a cover shield having a perforation structure in a region corresponding to the transformer.

The liquid crystal display as described above can prevent the magnetic field from crossing the cover shield and prevent the generation of eddy currents to prevent heat generation.

LCD, inverter, cover shield, perforation, heat dissipation

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

1 is an exploded perspective view showing a general direct type liquid crystal display device.

2 is a view illustrating a rear structure of a cover bottom of a conventional liquid crystal display device.

3 is a rear view of a cover bottom of the liquid crystal display according to the first embodiment of the present invention.

4 is an enlarged view of a cover shield corresponding to region A according to the first embodiment of the present invention shown in FIG.

5 is an enlarged view of a cover shield corresponding to an upper end portion of a transformer according to a second embodiment of the present invention;

6 is an enlarged view of a cover shield corresponding to an upper end portion of a transformer according to a third embodiment of the present invention;

<Description of Symbols for Main Parts of Drawings>

525: cover bottom 560: cover shield

570a: primary side wire 570b: secondary side wire

570: transformer 600: insulating paper

650: inverter 700: slit

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 capable of smoothly dissipating heat from a transformer provided in an inverter for supplying power to the liquid crystal display device, and a manufacturing method thereof. .

Recently, liquid crystal display devices, which are one of the flat panel display devices that are continuously attracting attention, are liquid.

A device that changes the optical anisotropy by applying an electric field to a liquid crystal that combines the liquidity and optical properties of the crystal.It has a low power consumption, a small volume, a large size, and a high definition compared to a conventional cathode ray tube. have.

In general, since most liquid crystal display devices are light-receiving devices that display images by controlling the amount of light coming from the outside, a separate light source for illuminating the liquid crystal panel, that is, a backlight unit, is necessarily required. Such a backlight unit is classified into an edge type and a direct type according to the location where the lamp unit is installed.

The edge type is a lamp unit is installed on the side of the light guide plate for guiding the light, the lamp unit is a lamp that emits light, a lamp holder which is inserted at both ends of the lamp to protect the lamp, and wraps around the outer surface of the lamp It is provided with a lamp reflection plate fitted to the side of the light guide plate to reflect the light emitted from the lamp toward the light guide plate.

The edge type is mainly applied to a liquid crystal display device having a relatively small size, such as a monitor of a laptop computer and a desktop computer, and has good light uniformity, a long durability life, and is advantageous for thinning of the liquid crystal display device.

On the other hand, the direct type is mainly developed as the liquid crystal display device is large screen, and a plurality of lamps are arranged in a row on the lower surface of the diffusion plate to direct light directly to the front of the liquid crystal display panel. Such a direct type is mainly used for a large screen liquid crystal display device requiring high luminance because the light utilization efficiency is higher than that of the edge type.

The backlight unit is generally divided into a light emitting part and a waveguide part. The waveguide part is an optical part system that makes light emitted from a light emitting lamp into a uniform surface light source, and is composed of a reflector plate, a diffuser plate, and a prism sheet. A light emitting lamp, an inverter for supplying power to the light emitting lamp, and a shield cover for protecting the inverter are provided.

1 is an exploded perspective view illustrating a general direct type liquid crystal display.

As shown in FIG. 1, a general direct type liquid crystal display device 100 includes a direct type backlight unit 120 that provides light to the liquid crystal panel 110 representing a screen.

Although not shown in FIG. 1, the liquid crystal panel 110 includes a thin film transistor (TFT) substrate, a color filter substrate, and liquid crystal injected between the substrates. Also, a data printed circuit board, a gate printed circuit board, a data side tape carrier package (hereinafter referred to as TCP) and a gate side TCP.                         

Meanwhile, the direct type backlight unit 120 diffuses the lamp unit 121 generating the first light, the reflecting plate 123 for reflecting the first light generated from the lamp unit 121, and the first light. It consists of a light control unit 122 for emitting a second light having a uniform luminance distribution.

A cover bottom 125 is provided to accommodate the liquid crystal panel 110 and the backlight unit 120.

The light control unit 122 includes a diffuser plate 122a, a first diffuser sheet 122b, a prism sheet 122c, and a second diffuser that are sequentially disposed on the diffuser plate 122a. The sheet 122d is included.

Here, the lamp unit 121 is an inverter for supplying power to the lamp unit 121 and the lamp holder 121b respectively installed at opposite ends of the at least one lamp 121a, the at least one lamp 121a. (Inverter: 150) is provided, the inverter 150 is surrounded by a cover shield (Cover Shield; 160).

2 is a diagram illustrating a rear structure of a cover bottom of a conventional liquid crystal display.

As shown in FIG. 2, the inverter 150 is disposed at one edge of the rear surface of the cover bottom 125, and the inverter 150 includes a transformer (not shown) and an inverter IC (not shown) for converting a voltage. Not shown).

A cover shield 160 is disposed on the inverter 150 to protect the inverter 150 from external static electricity. In order to smoothly dissipate heat generated by the inverter 150, a plurality of cover shields are provided on the surface of the cover shield. Holes were formed.

In addition, voltage conversion is performed in the transformer (not shown) included in the inverter 150. As the liquid crystal display device is enlarged in recent years, a backlight using a high output transformer increases, and the high output transformer is used. In the case of the backlight unit, a large amount of magnetic flux (x) is bound to the cover shield, the resulting eddy current (Eddy Current) the system is subjected to high heat dissipation and power loss.

Disclosure of Invention An object of the present invention is to provide a liquid crystal display device in which a cover shield on a transformer for converting voltage is perforated according to the transformer shape and size to minimize eddy currents to smooth heat dissipation and prevent power loss. It is.

The liquid crystal display device of the present invention comprises a liquid crystal panel; A backlight unit; A cover bottom accommodating the liquid crystal panel and the backlight unit therein; An inverter positioned on a rear surface of the cover bottom and having a transformer; And a cover shield having a perforation structure in a region corresponding to the transformer.

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

<First Embodiment>

FIG. 3 is a rear view of a cover bottom of the liquid crystal display according to the first exemplary embodiment of the present invention, and FIG. 4 is a cover shield corresponding to region A according to the first exemplary embodiment of the present invention shown in FIG. This is an enlarged drawing.

As shown in FIGS. 3 and 4, the cover shield 560 according to the first embodiment of the present invention includes a cover bottom 525 including a liquid crystal panel (not shown) and a backlight unit (not shown). It is disposed on one side of the back of the) and includes an inverter 650 therein.

Although not shown, the liquid crystal panel is composed of a liquid crystal layer largely sandwiched between the upper and lower substrates and the upper and lower substrates, and serves to display using a change in liquid crystal arrangement according to a selective change in voltage. The backlight unit usually serves to supply light to the liquid crystal panel.

Therefore, an inverter 650 is required to supply a constant voltage and current to the backlight unit, and the backlight unit is driven by the voltage and current supplied from the inverter 650, and the brightness of the lamp is determined by the magnitude of the lamp current. The brightness is maintained in proportion.

In addition, the inverter 650 for supplying power to the backlight unit is disposed on the inner surface of the cover shield 560 and is composed of a transformer 570 and an inverter IC (not shown).

The transformer 570 has a high output and includes a primary side wire 570a and a secondary side wire 570b.

Although not shown, the inverter IC includes a first switch transistor, a second switch transistor, a first snubber capacitor, a second snubber capacitor, a reset capacitor, a control circuit, and the like.

As described above, since the inverter 650 that changes and supplies power to the backlight unit emits heat by itself, a cover hole 560 surrounding the backlight unit 560 forms a plurality of holes for dissipation of heat generated from the inverter 650.

However, as the liquid crystal display becomes larger, the transformer 570 constituting the inverter 650 becomes higher in output, and the magnetic field generated in the high output transformer 570 approaches the cover shield 560.

The cover shield 560 is manufactured by mixing any one or two or more of metal, silicon, rubber, or plastic. As the magnetic field is bridged to the cover shield 560, eddy currents are generated, thereby causing the system to dissipate heat. And loss of power through this.

Therefore, by perforating the cover shield 560 by an area corresponding to the upper end of the transformer 570, it is possible to prevent the magnetic field from crossing the cover shield 560 to prevent the generation of eddy currents to prevent the heat generation phenomenon.

Second Embodiment

In the liquid crystal display according to the second exemplary embodiment of the present invention, the perforation of the cover shield by the region corresponding to the upper end of the transformer is the same as described in the first exemplary embodiment of the present invention, and thus description thereof will be omitted.

5 is an enlarged view of a cover shield corresponding to an upper end portion of a transformer according to a second embodiment of the present invention.

As shown in FIG. 5, the cover shield 560 according to the second embodiment of the present invention has a rear surface of a cover bottom 525 including a liquid crystal panel (not shown) and a backlight unit (not shown). It is disposed on one side of and includes an inverter 650 therein.

The transformer 570-shaped perforations are formed in the cover shield 560 corresponding to the upper end of the transformer 570 on the inverter 650, thereby preventing the magnetic field from crossing the cover shield 560, thereby generating an eddy current. It can prevent fever phenomenon.

However, in general, since the secondary wire 570b of the transformer 570 of the inverter 650 is a high voltage, damage to the user may occur through the perforated portion of the cover shield 560.

Therefore, attaching the insulating paper 600 to the perforated area of the cover shield 560 not only prevents the magnetic field from crossing, but also prevents the user from contacting the high voltage secondary wire of the transformer.

Third Embodiment

In the liquid crystal display according to the third exemplary embodiment of the present invention, the perforation of the cover shield by the region corresponding to the upper end of the transformer is the same as described in the first and second exemplary embodiments of the present invention, and the description thereof is omitted. I'll do it.

6 is an enlarged view of a cover shield corresponding to an upper end portion of a transformer according to a third embodiment of the present invention.

As shown in FIG. 6, the cover shield 560 according to the third embodiment of the present invention has a rear surface of a cover bottom 525 including a liquid crystal panel (not shown) and a backlight unit (not shown). It is disposed on one side of and includes an inverter (not shown) inside.

A plurality of holes were formed in the entire area of the cover shield 560 and slit structures spaced at predetermined intervals were formed in the areas of the transformer 570 having high heat generation. Therefore, the area of the cover shield 560 corresponding to the transformer 650 is formed of the slits 700 perforated at predetermined intervals.

As shown in FIG. 6, the direction of the slit 700 is more effective when the direction of the slit 700 coincides with the direction of the winding.

In addition, the portion exposed by the slit 700 may prevent the generation of eddy current by preventing the generation of eddy current by reducing the area of the magnetic field to the cover shield 560.

In the liquid crystal display of the present invention, a transformer-shaped perforation is formed in the cover shield corresponding to the upper end of the transformer, thereby preventing the magnetic field from crossing on the cover shield and preventing generation of eddy currents, thereby preventing high temperature heat generation.

In addition, the liquid crystal display of the present invention forms a transformer-shaped perforation on the cover shield corresponding to the upper end of the transformer, attaches insulating paper, or perforates the slit structure, thereby preventing damage to the user from the perforated cover shield. This can be prevented.

In addition, the present invention is not limited to the embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

Claims (6)

A liquid crystal panel; A backlight unit; A cover bottom accommodating the liquid crystal panel and the backlight unit therein; An inverter positioned on a rear surface of the cover bottom and having a transformer; And a cover shield having a perforation structure in a region corresponding to the transformer. The method of claim 1, And a perforated shape of the cover shield is polygonal. The method of claim 1, And the perforated region is formed in a slit structure. The method of claim 3, wherein And the slit structure coincides with the winding direction. The method of claim 1, And an insulating sheet configured to cover the whole or part of the perforated area of the cover shield. The method of claim 1, And the cover shield is made by mixing any one or two or more of metal, silicon, rubber or plastic.

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