KR20080041016A - Liquid crystal display device - Google Patents

Abstract

An LCD device is provided to contact a part of a bottom chassis to a lamp socket, thereby preventing heat in a light source from being transferred to an LCD panel to improve optical efficiency. A plurality of second cut portions(820) is formed to be spaced from a first cut portion(810) at a predetermined distance. The second cut portion is formed not to be influenced by the first cut portion and is formed at a nearest distance from the electrode portion of a lamp(310). A fourth projected portion(822) is formed in a side of the second cut portion. The fourth projected portion is formed not to be influenced by a lamp socket(320) and the lamp contained in the first cut portion. The fourth projected portion can absorb heat in the electrode of a light source. Accordingly, the amount of heat transferred to a bottom chassis increases to prevent the heat from being transferred to an LCD panel.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

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

2 is a cross-sectional view of A-A showing a combined state of a liquid crystal display according to a first exemplary embodiment of the present invention.

3 and 4 are perspective views showing a modification of the bottom chassis according to the first embodiment of the present invention.

5 is a perspective view illustrating a bottom chassis according to a second embodiment of the present invention.

6 is a graph measuring the thermal analysis of the conventional structure and the structure according to the present invention.

             <Description of the code | symbol about the principal part of drawings>

100: liquid crystal display panel 200: driver

300: light source 400: reflector

500: optical sheet 610: middle mold frame

620: side mold frame 800: bottom chassis

810: first incision 820: second incision

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device for lowering the temperature of the liquid crystal display panel by changing the structure of the bottom chassis.

In general, a flat panel display (FPD) is a display device essential for realizing a compact and lightweight system such as a monitor of a desktop computer, a portable computer such as a notebook computer, a PDA, or a mobile phone terminal. The device includes a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), and the like.

In particular, since the liquid crystal display is a non-emissive type display device that displays an image by controlling the amount of light source coming from the outside, a backlight assembly including a separate light source for irradiating light to the liquid crystal display panel is required. Do.

Recently, large LCD-TVs and digital information displays (DIDs) use about 20 to 50 cold cathode fluorescent lamps (CCFLs) as light sources, and heat is generated from the electrode parts of the lamps.

Heat generated from the light source is transferred to the liquid crystal display panel, the top chassis, and the bottom chassis, and the heat transferred to the liquid crystal display panel causes deterioration problems in the liquid crystal of the liquid crystal display panel, thereby causing luminance deviation in the liquid crystal display panel. This causes a problem of reducing the light efficiency of the liquid crystal display device.

Accordingly, studies are being conducted to lower the temperature of the panel by additionally using a heat dissipation member so that heat generated by the light source is not transmitted to the liquid crystal display panel. However, the additional use of the heat dissipation member increases the thickness of the liquid crystal display, It causes problems of reduced brightness, increased workability and increased price.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a liquid crystal display device for improving light efficiency by preventing heat generated from a light source from being transferred to a liquid crystal display panel.

In order to achieve the above object, the liquid crystal display device of the present invention includes a liquid crystal display panel, a backlight assembly including a light source and a light source socket for providing light to the liquid crystal display panel, and accommodates the liquid crystal display panel and the backlight assembly. The bottom chassis includes a bottom chassis in which a plurality of cutouts are formed and fixed to accommodate the light source socket, and at least one side of the cutout includes a protrusion extending upward.

The protrusion may be formed on at least one side of three sides except for one side that interferes with the light source stored in the light source socket.

Further comprising a flat portion extending perpendicularly to the upper portion of the protrusion, characterized in that the flat portion is formed to cover the upper portion of the light source socket.

The protrusion may be formed to be bent from the bottom chassis.

The protrusion may be in contact with at least one surface of the light source socket.

In addition, in order to achieve the above object, the liquid crystal display device of the present invention, a liquid crystal display panel, a backlight assembly including a light source and a light source socket for providing light to the liquid crystal display panel, the liquid crystal display panel and the backlight assembly And a bottom chassis configured to receive and fix the light source socket, wherein the bottom chassis includes a cutout portion spaced apart from the light source socket by a predetermined distance, and at least one side of the cutout portion has a protrusion extending upward. It is done.

The protrusion may be formed so as not to interfere with the light source.

The protrusion is characterized in that formed on one side of the cutout portion close to the light source socket.

The protrusion may be formed to be bent from the bottom chassis.

Hereinafter, with reference to the drawings will be described an embodiment of the present invention; However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Like reference numerals in the drawings refer to like elements.

1 is an exploded perspective view showing a liquid crystal display according to a first embodiment of the present invention, FIG. 2 is a cross sectional view of AA showing a combined state of the liquid crystal display according to the first embodiment of the present invention, and FIG. 4 is a perspective view showing a modification of the bottom chassis according to the first embodiment of the present invention, Figure 5 is a perspective view showing a bottom chassis according to a second embodiment of the present invention, Figure 6 is a conventional structure and the present It is a graph measuring the thermal analysis of the structure according to the invention.

1 and 2, a liquid crystal display according to the present invention includes a display assembly 1000, a backlight assembly 2000 that provides light to the display assembly 1000, the display assembly 1000, and a backlight. And an accommodating member 3000 for accommodating the assembly 2000.

The display assembly 1000 includes a liquid crystal display panel 100 and a driver 200 for driving the liquid crystal display panel 100.

The liquid crystal display panel 100 includes a color filter (CF) substrate 110 and a thin firt transistor (TFT) substrate 120 disposed under the CF substrate 110.

The CF substrate 110 is coated with a common electrode made of a color filter on one surface and a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO) on the color filter. have.

The TFT substrate 120 is a transparent glass substrate on which a TFT in a matrix form is formed. A data line is connected to a source terminal of the TFTs, and a gate line is connected to a gate terminal. In addition, a pixel electrode made of a transparent conductive material is connected to the drain terminal.

Therefore, the CF substrate 110 and the TFT substrate 120 having the above configuration are bonded to each other, and a liquid crystal is injected between the CF substrate 110 and the TFT substrate 120, or the liquid crystal is injected into the CF substrate 110 or the like. The liquid crystal display panel 100 is completed by dropping the TFT substrate 120 and then bonding the CF substrate 110 and the TFT substrate 120 together.

The driver 200 is installed on one side of the liquid crystal display panel 100, that is, one side of a data line and a gator line of the TFT substrate 120, and a data printed circuit board (PCB) 210a and a gate PCB. 210b, a data tape carrier package (TCP 220a) and a gate TCP 220b for connecting the data PCB 210a and the gate PCB 210b to data lines and gate lines.

That is, the driver 200 generates a data signal for driving the liquid crystal display, a gate driving signal, and a plurality of driving signals for applying these signals at an appropriate time, thereby generating the gate driving signal and the data driving signal through the liquid crystal display panel ( Serves to apply to the gate line and the data line of (100).

The backlight assembly 2000 is provided below the display assembly 1000 to provide uniform light to the display assembly 1000.

The backlight assembly 2000 includes a light source unit 300, a reflector plate 400 provided below the light source unit 300, an optical sheet 500 provided above the light source unit 300, the light source unit 300, And a mold frame 600 accommodating the reflector plate 400 and the optical sheet 500.

The light source unit 300 includes a plurality of bar lamps 310 arranged in parallel, a lamp socket 320 for fixing and supporting the lamp 310, and a lamp 310 connected to the lamp socket 320. Inverter 330 for applying power to the.

The lamp 310 mainly uses a cold cathode fluorescent lamp (CCFL), and each of the lamps 310 includes a glass tube, light emitting gases contained in the glass tube, and a negative electrode and a positive electrode installed at both ends of the glass tube. . The lamp socket 320 has a lamp seating portion 322 formed therein to seat the lamp 310 on the lamp seating portion 322 and to fix the lamp 310 on both sides of the lamp 310. Play a role. In addition, the inverter 330 serves to apply a driving voltage to the lamp by transforming the external power to a constant voltage level.

In this case, the lamp socket 320 is inserted into the cutout 810 formed in the bottom chassis 800, and the inverter 330 connected to the lamp socket 320 is disposed on the bottom of the bottom chassis 800. In addition, an inverter cover (not shown) is further provided to fix the inverter 330, and the inverter cover is fixed to the rear surface of the bottom chassis 800 while covering the inverter 330. In this case, a plurality of holes (not shown) may be formed in the inverter cover, and the holes serve to help heat dissipation of the inverter 330.

The reflecting plate 400 is disposed under the light source unit 300 and uses a plate having a high light reflectance. Although the reflective plate 400 is illustrated as having a flat shape in the drawing, the reflective plate 400 may be manufactured to have a reference reflective surface and an inclined surface having a predetermined angle inclination from the reference reflective surface.

The optical sheet 500 includes a diffusion sheet 510 and a plurality of prism sheets 520 disposed on the diffusion sheet 510.

The diffusion sheet 510 is a mixture of a diffusion agent in a resin plate such as acrylic or polycarbonate, and directs light incident from a plurality of light sources toward the front of the liquid crystal display panel 100, and provides a uniform distribution in a wide range. Diffuses light so as to irradiate the liquid crystal display, and the prism sheet 520 is provided as a plurality of sheets on the diffusion sheet 510, and the light diffused from the diffusion sheet 510 It is perpendicular to the liquid crystal display panel 100 to condense the light toward the liquid crystal display panel 100.

In this case, a pattern may be formed on the upper and lower portions of the prism sheet 520 to collect and diffuse light, and may further include a protective sheet (not shown) to protect the surface of the prism sheet 520. .

The mold frame 600 includes a middle mold frame 610 and a side mold frame 620.

The middle mold frame 610 is in the form of a rectangular frame having an open top and bottom, and the liquid crystal display panel 100 is mounted on the middle mold frame 610, the inside of the middle mold frame 610 The light source unit 300 and the plurality of sheets 400 and 500 are accommodated.

The side mold frame 620 has sidewalls and inclined portions facing each other, and a planar portion connecting the sidewalls and the inclined portions is formed at an upper portion thereof. In addition, a stepped portion is formed in the inclined portion, and a plurality of light source accommodating grooves 622 are formed in the lower portion of the inclined portion. That is, a part of the light source unit 300 is accommodated in the light source accommodating groove 622, and the diffusion sheet 510 and the prism sheet 520 are seated on the step.

The accommodation member 3000 serves to accommodate and fix the display assembly 1000 and the backlight assembly 2000, and includes a top chassis 900 and a bottom chassis 800.

The top chassis 900 is formed in a rectangular frame shape having upper and lower portions open, and includes a sidewall portion bent downward from an edge of the top chassis 900. That is, the top chassis 600 covers the upper portion of the liquid crystal display panel 100 to protect and fix the liquid crystal display panel 100. The bottom chassis 800 accommodates the backlight assembly 2000 and is combined with the top chassis 900 to form a liquid crystal display.

In detail, as shown in FIGS. 1 and 2, the bottom chassis 800 includes a base 801 and first to fourth sidewall portions bent vertically from an edge of the base 801. 802 to 808). In this case, the first sidewall portion 802, the second sidewall portion 804, the third sidewall portion 806, and the fourth sidewall portion 808 are formed to face each other.

A plurality of upper and lower cutouts 810 are formed at one side of the base 801 and the other side facing the one side, and specifically, the third sidewall part 806 and the fourth sidewall part 808 are perpendicular to each other. A plurality of cutouts 810 are formed in the direction. The lamp socket 320 is inserted into the cutout 810, and the shape of the cutout 810 is formed to correspond to the lamp socket 320.

In addition, the lamp socket 320 and the inverter 330 are connected through the cutout 810, and the inverter 330 is seated on the rear surface of the bottom chassis 800. Although the cutout 810 is formed in the vertical direction of the third sidewall portion 806 and the fourth sidewall portion 808 in the drawing, the present invention is not limited thereto. The lamp 810 may be formed along the portion where the light source 300 is seated. The socket 320 may be provided at a corresponding position.

One side of the cutout 810 is formed with a first protrusion 812 that is bent upwards of the base 801. In detail, the first protrusion 812 is bent upward from one side of the cutout 810, and the first protrusion 812 is formed to contact the rear portion of the lamp socket 320.

Accordingly, the first protrusion is formed to be in contact with the rear portion of the lamp socket 320 assembled to the cutout 810 of the bottom chassis 800, whereby the heat generated from the electrode portion of the lamp 310 Since it is transmitted to the bottom chassis 800 through the protrusion 812 and discharged to the outside, that is, the amount of heat radiated through the bottom chassis 800 is increased, thereby reducing the heat transmitted to the liquid crystal display panel 100. The light efficiency of the liquid crystal display device can be improved.

In the above, the first protrusion 812 is formed by bending the cut portion upward, but the protrusion is formed on one side of the cutout 810, but the present invention is not limited thereto, and the cutout 810 may be formed using a separate member. Of course, it can be formed on one side. In addition, when using a separate member, it is more preferable to use the same material as the bottom chassis 800.

In addition, the structure of the bottom chassis 800 may be configured as shown in FIGS. 3 and 4.

That is, as shown in FIG. 3, the second protrusion 814 may be formed on one side of the cutout 810 formed in the bottom chassis 800, specifically, on the vertical side of the first sidewall part 802. And, it is formed on one side of the four sides of the cutout 810, it is preferable to exclude the direction in which the lamp 310 is seated. In addition, at least one protrusion may be formed on the remaining sides except for the direction in which the lamp 310 is seated.

At this time, the second protrusion 810 is in contact with the lamp socket, whereby heat generated in the electrode portion of the lamp 310 is transmitted to the bottom chassis 800 through the second protrusion 814 to the outside In other words, the heat transmitted to the liquid crystal display panel 100 may be reduced by increasing the amount of heat radiated through the bottom chassis 800, thereby improving the light efficiency of the liquid crystal display device.

In addition, as shown in FIG. 4, the second protrusions 814 and the third protrusions 816 are formed on both sides of the protrusions facing each other, specifically, both sides of the first side wall portion 802 that are perpendicular to each other. In addition, a planar portion 818 connecting upper portions of the second protrusion 814 and the third protrusion 816 may be formed. In this case, the protrusion may further form a protrusion (not shown) to connect the edges of the second protrusion 814 and the third protrusion 816 in addition to the second protrusion 814 and the third protrusion 816.

Therefore, the second and third protrusions 814 and 816 and the flat portion 818 as described above are formed to surround three or four sides of the lamp socket 312 assembled to the bottom chassis 800, but the bottom chassis ( And the heat generated at the electrode of the lamp 310 is transferred to the bottom chassis 800 through the second and third protrusions 814 and 816 and the planar portion 818. It is possible to absorb more heat than the structure according to the first embodiment of the present invention, thereby preventing heat from being transferred to the liquid crystal display panel 100 to improve the light efficiency.

In addition, the bottom chassis 800 may have a structure as shown in FIG. 5.

That is, as shown in FIG. 5, a plurality of second cutouts 820 are formed in the cutout (hereinafter, referred to as a first cutout) according to the first embodiment to be spaced a predetermined distance from the 810. In this case, the second cutout 820 is formed so as not to interfere with the first cutout 810, but is formed as close as possible to the first cutout 810, that is, the closest distance to the electrode of the lamp. It is desirable to.

One side of the second cutout 820 is formed with a fourth protrusion 822 which is bent upward, and the fourth protrusion 822 is a lamp socket 320 housed in the first cutout 810 and It is preferable to form so as not to interfere with the lamp 310.

That is, the fourth protrusion 822 is formed by cutting a part of the second cutout 820 and bending the cut-out portion upward. In this case, although the fourth protrusion 822 is formed by bending the cut portion from the second cutout 820, it may be formed using a separate member, and of course, the separate member may be the bottom chassis. It is preferable to form the same as the material of (800).

Accordingly, the fourth protrusion 822 may absorb heat generated from the electrode of the light source, thereby increasing the amount of heat transferred to the bottom chassis 800, thereby transferring the heat to the liquid crystal display panel 100. Can be prevented and the light efficiency of the liquid crystal display can be improved.

That is, as a result of performing thermal analysis on the DID 46 "Narrow Bezel model having the above structure, as shown in FIG. 6, the temperature (B) generated in the liquid crystal display panel of the conventional structure is 39.7 degrees, The temperature (C) generated in the liquid crystal display panel 100 of the structure according to the present invention is measured 39.1 degrees, it can be seen that about 0.6 degrees apart, and the temperature (D) generated in the bottom chassis of the conventional structure is 50.1 Compared to the figure, the temperature E generated in the bottom chassis 800 of the structure according to the present invention is 56.6 degrees, indicating that more heat is absorbed from the bottom chassis 800 of the structure according to the present invention.

In addition, in the present invention, the leakage current also decreases, and the leakage current reduction and the heat dissipation effect are combined to reduce the overall temperature by about 2 to 4 degrees, thereby increasing the brightness by about 4%.

Although the fourth protrusion 822 is formed on one side of the second cutout 820, the present invention is not limited thereto, and the protrusion may be formed on at least one side of the second cutout 820.

In addition, although the above description has been made focusing on one end of the lamp electrode unit, it can be applied to the other end of the lamp electrode unit.

In addition, of course, the first and second embodiments may be used alone or in combination.

Although described above with reference to the drawings and embodiments, those skilled in the art that the present invention can be variously modified and changed without departing from the spirit of the invention described in the claims below. I can understand.

As described above, the liquid crystal display of the present invention has an effect of improving light efficiency by preventing the heat generated from the light source from being transferred to the liquid crystal display panel by contacting a portion of the bottom chassis with the lamp socket.

In addition, the present invention by changing only the structure of the bottom chassis, it is possible to prevent the transfer of the heat to the liquid crystal display panel without additional components, there is an effect that can reduce the cost and improve the productivity.

In addition, the present invention can block the heat without a separate heat radiating member has the effect of reducing the thickness of the liquid crystal display device.

Claims (9)

A liquid crystal display panel, A backlight assembly including a light source and a light source socket for providing light to the liquid crystal display panel; A bottom chassis includes a bottom chassis in which a plurality of cutouts are formed to accommodate and fix the liquid crystal display panel and the backlight assembly, and to accommodate the light source socket. At least one side of the cutout includes a protrusion extending upwardly. The liquid crystal display of claim 1, wherein the protrusion is formed on at least one side of the three sides except for one side that interferes with the light source stored in the light source socket. The liquid crystal display device of claim 2, further comprising a planar portion extending perpendicularly to an upper portion of the protrusion, wherein the planar portion is formed to cover an upper portion of the light source socket. The liquid crystal display of claim 3, wherein the protrusion is bent from the bottom chassis. The liquid crystal display device as claimed in claim 1, wherein the protrusion is in contact with at least one surface of the light source socket. A liquid crystal display panel, A backlight assembly including a light source and a light source socket for providing light to the liquid crystal display panel; A bottom chassis configured to receive and fix the liquid crystal display panel and the backlight assembly and to receive the light source socket, The bottom chassis includes a cutout formed to be spaced apart from the light source socket by a predetermined distance, and at least one side of the cutout has a protrusion extending upwardly. The liquid crystal display of claim 6, wherein the protrusion is formed not to interfere with the light source. The liquid crystal display device of claim 7, wherein the protrusion is formed at one side of a cutout portion close to the light source socket. The liquid crystal display of claim 8, wherein the protrusion is bent from the bottom chassis.

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