KR20070042332A - Chassis and backlight assembly and liquid crystal display device comprising the same - Google Patents

Abstract

The present invention relates to a chassis having a structure for lowering a temperature of a lamp central portion of a liquid crystal display, a backlight assembly including the same, and a liquid crystal display, the base plate and a plurality of sidewalls bent from the base plate and extended to a predetermined height. And a heat dissipation plate having a predetermined thickness is formed in a predetermined region of the base plate, and a backlight assembly including the same and a liquid crystal display device including the same.

Heat Sink, Chassis, Backlight Assembly, Liquid Crystal Display

Description

Chassis for liquid crystal display, backlight assembly and liquid crystal display including the same {CHASSIS AND BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY DEVICE COMPRISING THE SAME}

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

FIG. 1B is a schematic perspective view of the lower chassis of FIG. 1A.

2 is a diagram illustrating a temperature distribution of an LCD panel of a liquid crystal display device.

3 is a diagram illustrating a temperature distribution of an LCD panel of a large liquid crystal display.

4A is a perspective view of a chassis for a liquid crystal display according to a first embodiment of the present invention.

4B is a cross-sectional view taken along the line A-A of FIG. 4A.

5A is a perspective view of a chassis for a liquid crystal display according to a second exemplary embodiment of the present invention.

5B is a cross-sectional view taken along the line B-B in FIG. 5A.

6 is an exploded perspective view of a liquid crystal display including a chassis according to the present invention.

7 is a schematic cross-sectional view of a liquid crystal display device including a chassis for a liquid crystal display device according to a first embodiment of the present invention.

8 is a schematic cross-sectional view of a liquid crystal display including a chassis for a liquid crystal display according to a second embodiment of the present invention.

9A is an exploded perspective view of another liquid crystal display device including a chassis according to the present invention, and FIG. 9B is a schematic cross-sectional view of a liquid crystal display device including a chassis for a liquid crystal display device according to the present invention.

10A is a lamp temperature distribution when using the chassis according to the prior art, FIG. 10B is a lamp temperature distribution when using the chassis according to the first embodiment of the present invention, and FIG. 10C is a case when using the chassis according to the second embodiment of the present invention. Figure showing the lamp temperature distribution.

* Description of the symbols for the main parts of the drawings *

100: LCD panel 210: lamp unit

240: diffuser plate 250: optical plate

260: lower chassis 270: heat sink

280: reflector 300: mold frame

400: upper chassis

The present invention relates to a chassis for a liquid crystal display, a backlight assembly including the same, and a liquid crystal display, and more particularly, a chassis having a structure for lowering a temperature of a lamp center portion of the liquid crystal display, a backlight assembly and a liquid crystal display including the same. It is about.

In general, the liquid crystal display (LCD) is expanding its application range due to features such as lightweight, thin, low-power drive, full-color, high-resolution implementation. Currently, liquid crystal displays are used in computers, notebooks, PDAs, telephones, TVs, and audio / video devices. In such a liquid crystal display device, a light transmittance is adjusted according to an image signal applied to a plurality of control switches arranged in a matrix to display a desired image on a panel of the liquid crystal display device.

Such a liquid crystal display device displays a desired image on a screen by adjusting the amount of light transmitted according to image signals applied to a plurality of control switches arranged in a matrix form, and operates an LCD panel that directly displays an image. LCD driver IC, a backlight unit used as a light source of the liquid crystal display device, and a chassis for fastening each component of the liquid crystal display device into one unit, wherein the backlight unit is disposed on one side of the plane of the panel to form a front surface of the panel. It is divided into a direct method of dimming the light source and an edge method of reflecting and diffusing light to a light guide plate and a reflecting plate by disposing a light source on one side or a plurality of side surfaces of the panel.

FIG. 1A is an exploded perspective view of a general direct type liquid crystal display, and FIG. 1B is a schematic perspective view of the lower chassis of FIG. 1A.

The liquid crystal display shown in FIG. 1A includes an LCD panel 100, a backlight assembly 200 for use as a light source of the LCD panel 100, and a mold frame 300 for mounting the backlight assembly 200. A lower chassis 260 for accommodating the backlight assembly 200 and an upper chassis 400 for enclosing predetermined regions and sides of an upper portion of the LCD panel 100 and the backlight assembly 200, and a lower chassis 260 for accommodating the backlight assembly 200. It is composed of

FIG. 1B shows a schematic perspective view of the lower chassis 260 shown in FIG. 1A, which is composed of a base plate and four sidewalls extending in a vertical direction from the base plate. Form.

2 is a diagram illustrating a temperature distribution of an LCD panel of a general liquid crystal display, and FIG. 3 is a diagram illustrating a temperature distribution of an LCD panel of a large liquid crystal display.

As shown in FIG. 2, when looking at the temperature distribution of the LCD panel of the liquid crystal display, the maximum temperature is shown in the upper right part of the LCD panel. On the contrary, when looking at the temperature distribution of the LCD panel of the large liquid crystal display shown in FIG. 3, the temperature of the center portion of the LCD panel is the highest. As the liquid crystal display becomes larger, a phenomenon in which the LCD panel and the diffusion plate are struck toward the backlight assembly is occurring. As the distance between the center of the LCD panel and the lamp is getting closer, a problem occurs that the temperature of the center of the LCD panel rises.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-described problems, and the technical problem to be achieved by the present invention is to reduce the temperature of the center of the lamp, the chassis having a heat sink or a heat dissipation portion formed in the center of the chassis and a backlight assembly and a liquid crystal display including the same Relates to a device.

According to an aspect of the present invention for achieving the object of the present invention, a base plate and a plurality of sidewalls bent from the base plate extending to a predetermined height, the predetermined region of the base plate is a heat sink of a predetermined thickness There is provided a chassis for a liquid crystal display device, which is formed.

The heat sink is characterized in that disposed in the center portion of the base plate.

The heat sink is characterized in that it comprises aluminum or steel.

The heat sink is characterized in that the thickness of 0.5mm to 3mm.

According to an aspect of the present invention for achieving the object of the present invention, a base plate and a plurality of sidewalls bent from the base plate extending to a predetermined height, the predetermined region of the base plate is a sidewall extending A chassis for a liquid crystal display device is provided which protrudes a predetermined height in a direction to form a heat radiating portion.

The heat dissipation unit is characterized in that it is disposed in the central portion of the base plate.

The heat dissipation unit is characterized in that it is formed integrally with the base plate.

According to another aspect of the present invention for achieving the object of the present invention, the lamp unit for generating light; A plurality of optical sheets disposed on the lamp unit and a chassis for accommodating the lamp unit and the plurality of optical sheets, wherein the chassis includes a base plate and a plurality of sidewalls bent from the base plate and extended to a predetermined height. And a heat dissipation plate having a predetermined thickness is formed in a predetermined region of the base plate.

The backlight assembly may further include a reflecting plate disposed under the lamp unit, and an area of the reflecting plate corresponding to an area where the heat sink is formed may protrude to a predetermined height.

According to another aspect of the present invention for achieving the object of the present invention, the lamp unit for generating light; A plurality of optical sheets disposed on the lamp unit and a chassis for accommodating the lamp unit and the plurality of optical sheets, wherein the chassis includes a base plate and a plurality of sidewalls bent from the base plate and extended to a predetermined height. And a predetermined area of the base plate protrudes a predetermined height in a direction in which the side wall extends to form a heat dissipation part.

The backlight assembly may further include a reflecting plate disposed under the lamp unit, and an area of the reflecting plate corresponding to an area where the heat radiating part is formed may protrude to a predetermined height.

A liquid crystal display device including a backlight assembly having the above characteristics is provided.

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

4A is a perspective view of a chassis for a liquid crystal display according to a first embodiment of the present invention, and FIG. 4B is a cross-sectional view taken along the line A-A of FIG. 4A.

The chassis 260 for the liquid crystal display according to the first embodiment includes a base plate 260a and four sidewalls 260c extending in a vertical direction from the base plate, thereby forming a predetermined storage space. In addition, a heat sink 270 having a predetermined thickness is formed at a central portion of the base plate 260a. The heat sink 270 is formed of aluminum or steel (eg, SECC steel, etc.), and the thickness of the heat sink is preferably 0.5 mm to 3 mm.

If the heat sink 270 as described above is formed at the center portion of the base plate 260a, the distance between the base plate 260a of the chassis and the heat sink 270 is different from that of the lamp disposed above the chassis. . That is, the distance between the lamp and the heat sink 270 is closer than the distance between the lamp and the base plate 260a, so that the lamp disposed on the heat sink 270 is more easily heated through the heat sink 270. Is released.

5A is a perspective view of a chassis for a liquid crystal display according to a second exemplary embodiment of the present invention, and FIG. 5B is a cross-sectional view taken along line B-B of FIG. 5A.

The chassis 260 for the liquid crystal display according to the second embodiment includes a base plate 260a and four sidewalls 260c extending in a vertical direction from the base plate to form a predetermined storage space. The heat dissipation portion 260b is formed at a central portion of the base plate 260a by protruding a predetermined height in a direction in which the side wall 260c extends, that is, in a vertical direction of the base plate. The heat dissipation unit 260b is integrally formed when the chassis is formed.

When the heat dissipation unit 260b is formed at the center portion of the base plate 260a, the lamp disposed on the upper portion of the chassis may have a difference in distance from the base plate 260a of the chassis and the heat dissipation unit 260b. do. That is, the separation distance between the lamp and the heat dissipation unit 260b is closer than the separation distance between the lamp and the base plate 260a, so that the lamp disposed above the heat dissipation unit 260b is heated through the heat dissipation unit 260b. This is more easily released.

6 is an exploded perspective view of a liquid crystal display including a chassis according to the present invention.

The liquid crystal display includes an LCD panel 100, a backlight assembly 200 for use as a light source of the LCD panel 100, a mold frame 300 for mounting the backlight assembly 200, and an LCD panel 100. ) And an upper chassis 400 to surround a predetermined region and a side of the backlight assembly 200, and a chassis 260 located at a lower portion of the backlight assembly to accommodate the backlight assembly 200. In this case, the chassis 260 is a chassis in which a heat sink or a heat sink is formed according to the first or second embodiment of the present invention.

The LCD panel 100 includes a thin film transistor substrate 112, a data side and gate side tape carrier package (TCP) 120 and 125 connected to the thin film transistor substrate 112, a data side and a gate. Data side and gate side printed circuit boards 130 and 135 connected to the side tape carrier packages 120 and 125, the color filter substrate 111 corresponding to the thin film transistor substrate 112, and the thin film transistor substrate 112. ) And a liquid crystal layer (not shown) injected between the color filter substrate 111. The display device may further include a polarizer (not shown) formed to correspond to the upper portion of the color filter substrate 111 and the lower portion of the thin film transistor substrate 112. Here, the color filter substrate 111 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process. A common electrode (not shown) made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO) is formed on the front surface of the color filter substrate 111.

The data side and gate side tape carrier packages 120 and 125 are respectively connected to data lines and gate lines of the thin film transistor substrate 112 to apply a data driving signal and a gate driving signal to the thin film transistors. In this case, the driving IC may be mounted in the tape carrier packages 120 and 125. The data side and gate side printed circuit boards 130 and 135 are connected to the data side and gate side tape carrier packages 120 and 125 to apply external image signals and gate driving signals.

The backlight assembly 200 includes a lamp unit 210 for generating light, a diffusion plate 240 and an optical plate 250 disposed on the lamp unit 210, the lamp unit 210, and a diffusion plate ( And a chassis 260 for accommodating the 240 and the optical plate 250.

Here, the lamp unit 210 includes a plurality of bar lamps 210a arranged in parallel, a plurality of lamp fixing parts 220 for fixing the lamps, and a lamp support part in which the plurality of lamp fixing parts 220 are housed. 230. The lamp 210a generates light by a driving voltage applied from the outside. The plurality of lamps 210a mainly use cold cathode fluorescent lamps, and each lamp 210a includes a glass tube, inert gases contained in the glass tube, and a negative electrode and a positive electrode installed at both ends of the glass tube. At this time, the phosphor is coated on the inner wall of the glass tube. The lamps 210a are preferably arranged at equal intervals for luminance uniformity, and the number of lamps 210a is preferably determined according to the required luminance. Each of the lamp fixing parts 220 includes a base substrate on which one end of the lamp is mounted, and a fixing clip and a fixing protrusion for protruding from the base substrate to fix the lamp. The lamp support 230 includes a bottom surface on which the plurality of lamp fixing parts 220 are mounted and a sidewall extending vertically from the bottom surface. In this case, the lamp fixing part 220 may be formed of a conductive material to apply power to the electrode of the lamp 210a. In this case, the lamp support 230 must be formed of an insulating material to electrically insulate the electrode of the lamp 210a from the chassis 260.

The diffusion plate 240 directs the light incident from the plurality of lamps to the front of the LCD panel 100, diffuses the light to have a uniform distribution in a wide range, and irradiates the LCD panel 100 with the optical fibers. The plate 250 serves to change the light incident at an oblique angle among the light incident on the optical plate 250 to be emitted vertically.

The mold frame 300 is formed in a rectangular frame shape and includes a planar portion and sidewall portions bent at right angles therefrom. The mounting part is formed on the flat part, and the LCD panel 100 is seated, and the optical plate 250, the diffusion plate 240, and the lamp unit 210 are fixed between the mold frame 300 and the chassis 260. do.

As described above, the chassis 260 includes a base plate 260a and four sidewalls 260c extending in a vertical direction from the base plate to form a predetermined storage space. The heat sink 270 having a predetermined thickness is formed in the center portion of the base plate 260a, or the sidewall 260c extends in the center portion of the base plate 260a, that is, the vertical direction of the base plate. To a predetermined height to form a heat dissipation unit 260b.

In the present embodiment, the reflector is integrally formed with the chassis 260, and a separate reflector is not installed.

7 is a schematic cross-sectional view of a liquid crystal display device including a chassis for a liquid crystal display device according to a first embodiment of the present invention.

Referring to FIG. 7, a chassis 260 having a predetermined storage space is disposed under the liquid crystal display, and a heat sink 270 having a predetermined thickness in a central portion of the base plate 260a of the chassis 260. ) Is formed. A plurality of bar lamps 210a are disposed above the chassis, and a diffusion plate 240, an optical plate 250, and an LCD panel 100 are sequentially disposed on the lamps.

Since the separation distance between the lamp 210a and the heat sink 270 is closer than the separation distance between the lamp 210a and the base plate 260a, the lamp disposed on the heat sink 270 is disposed through the heat sink 270. Heat is released more easily.

8 is a schematic cross-sectional view of a liquid crystal display including a chassis for a liquid crystal display according to a second embodiment of the present invention.

Referring to FIG. 8, a chassis 260 in which a predetermined storage space is formed is disposed below the liquid crystal display, and in a center portion of the base plate 260a of the chassis 260 in the vertical direction of the base plate. The heat dissipation part 260b is formed to protrude a predetermined height. A plurality of bar lamps 210a are disposed above the chassis, and the diffusion plate 240, the optical plate 250, and the LCD panel 100 are sequentially disposed on the lamps.

The separation distance between the lamp 210a and the heat dissipation part 260b is closer than the separation distance between the lamp 210a and the base plate 260a, so that the lamp disposed above the heat dissipation part 260b is the heat dissipation part 260b. Heat is more easily released through

9A is an exploded perspective view of another liquid crystal display device including a chassis according to the present invention, and FIG. 9B is a schematic cross-sectional view of a liquid crystal display device including a chassis for a liquid crystal display device according to the present invention.

The liquid crystal display illustrated in FIG. 9A includes an LCD panel 100, a backlight assembly 200 for use as a light source of the LCD panel 100, and a mold frame 300 for mounting the backlight assembly 200. ), An upper chassis 400 for covering a predetermined area and a side of the LCD panel 100 and the backlight assembly 200, and a chassis 260 for accommodating the backlight assembly 200 located under the backlight assembly. ). In this case, the chassis 260 is a chassis in which a heat sink or a heat sink is formed according to the first or second embodiment of the present invention. Meanwhile, unlike the backlight assembly illustrated in FIG. 6, the backlight assembly 200 according to the present embodiment includes a separate reflector.

The backlight assembly 200 may include a lamp unit 210 for generating light, a reflector plate 280 disposed under the lamp unit 210, a diffuser plate 240 and an optical plate disposed over the lamp unit 210. And a chassis 260 for accommodating the reflective plate 280, the lamp unit 210, the diffusion plate 240, and the optical plate 250.

Referring to FIG. 9B, a chassis 260 having a predetermined storage space is disposed below the liquid crystal display, and a heat sink 270 having a predetermined thickness in a central portion of the base plate 260a of the chassis 260. ) Is formed. A reflector plate 280 is disposed above the chassis to reflect light from a lamp to the diffuser plate. At this time, the region of the reflecting plate 280 corresponding to the region where the heat sink 270 is formed is formed to protrude to a predetermined height. A plurality of bar lamps 210a are disposed on the reflective plate, and the diffusion plate 240, the optical plate 250, and the LCD panel 100 are sequentially disposed on the lamp.

In FIG. 9B, the chassis for the liquid crystal display according to the first exemplary embodiment of the present invention is described as an example. Even when the chassis for the liquid crystal display according to the second exemplary embodiment of the present invention is applied, the reflecting plate 280 may be used. The central portion of is formed to protrude to a predetermined height.

10A is a lamp temperature distribution when using the chassis according to the prior art, FIG. 10B is a lamp temperature distribution when using the chassis according to the first embodiment of the present invention, and FIG. 10C is a case when using the chassis according to the second embodiment of the present invention. Figure showing the lamp temperature distribution.

10A illustrates a lamp temperature distribution using a chassis according to the related art, and a lamp temperature of a central portion is about 76.63 ° C., and FIG. 10B illustrates a lamp temperature distribution using a chassis according to a first embodiment of the present invention. Lamp temperature is about 73.5 ℃, Figure 10c is a lamp temperature distribution when using the chassis according to the second embodiment of the present invention, it can be seen that the lamp temperature of the central portion is about 74.01 ℃. Therefore, when using the heat sink or the heat dissipation chassis according to the present invention, it can be seen that the temperature of the lamp center portion decreases.

What has been described above is only an exemplary embodiment of a chassis for a liquid crystal display device, a backlight assembly and a liquid crystal display device including the same, and the present invention is not limited to the above-described embodiment, and is claimed in the following claims. As will be appreciated, those skilled in the art to which the present invention pertains will have the technical spirit of the present invention to the extent that various modifications can be made without departing from the gist of the present invention.

As described above, according to the present invention, by providing a chassis in which a heat radiation plate having a predetermined thickness is formed in the center portion of the base plate of the chassis or the heat radiation portion is formed so that the center portion of the base plate protrudes to a predetermined height, thereby providing a light source of the liquid crystal display device. The distance between the central portion of the phosphorus lamp and the chassis is made close, and the effect of lowering the temperature of the central portion of the lamp is obtained. As a result. The temperature in the center of the LCD panel can be lowered.

Claims (15)

Base plate and And a plurality of sidewalls bent from the base plate and extending to a predetermined height, wherein a heat sink having a predetermined thickness is formed in a predetermined region of the base plate. The method of claim 1, And the heat sink is disposed at a central portion of the base plate. The method of claim 1, The heat sink is a chassis for a liquid crystal display device comprising aluminum or steel. The method of claim 1, The heat sink has a thickness of 0.5mm to 3mm chassis for a liquid crystal display device. Base plate and And a plurality of sidewalls bent from the base plate and extending to a predetermined height, wherein the predetermined region of the base plate protrudes a predetermined height in a direction in which the sidewall extends to form a heat dissipation unit. The method of claim 5, And the heat dissipation unit is disposed at a center portion of the base plate. The method of claim 5, And the heat dissipation unit is integrally formed with the base plate. A lamp unit for generating light; A plurality of optical sheets disposed on the lamp unit; A chassis for accommodating the lamp unit and the plurality of optical sheets, wherein the chassis includes a base plate and a plurality of sidewalls bent from the base plate and extended to a predetermined height, and the predetermined area of the base plate has a predetermined thickness. A backlight assembly, characterized in that the heat sink is formed. The method of claim 8, The backlight assembly, And a reflector disposed below the lamp unit, wherein a region of the reflector corresponding to a region where the heat sink is formed is formed to protrude to a predetermined height. The method according to claim 8 or 9, And the heat sink is disposed at a central portion of the base plate. A lamp unit for generating light; A plurality of optical sheets disposed on the lamp unit; A chassis for accommodating the lamp unit and a plurality of optical sheets, the chassis including a base plate and a plurality of sidewalls bent from the base plate and extending to a predetermined height, wherein the predetermined region of the base plate is the sidewall. A backlight assembly, characterized in that protruding a predetermined height in the extended direction to form a heat radiating portion. The method of claim 11, The backlight assembly, And a reflecting plate disposed under the lamp unit, wherein a region of the reflecting plate corresponding to a region where the heat radiating portion is formed is formed to protrude to a predetermined height. The method according to claim 11 or 12, wherein The heat dissipation unit is a backlight assembly, characterized in that disposed in the central portion of the base plate. The method according to claim 11 or 12, wherein The heat dissipation unit is a backlight assembly, characterized in that formed integrally with the base plate. 13. A liquid crystal display device comprising a backlight assembly according to any one of claims 8, 9, 11 or 12.

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