KR100857849B1 - Liquid crystal display apparatus - Google Patents

Abstract

A liquid crystal display device capable of improving display characteristics is disclosed. The liquid crystal display device is disposed between a lamp for generating light to generate light, a storage container having a storage space for storing the lamp, and a storage container and the lamp to transfer heat generated from the lamp to the storage container to the outside. A heat conducting sheet for emitting light and a liquid crystal display panel for receiving light and displaying an image. Here, the thermally conductive sheet is made of a combination of a silicone gel and a thermally conductive inorganic material, and are disposed at both ends of the lamp, respectively. Therefore, the display characteristic of a liquid crystal display device can be improved.

Description

Liquid crystal display device {LIQUID CRYSTAL DISPLAY APPARATUS}

1 is an exploded perspective view of a liquid crystal display having a conventional direct type backlight assembly.

2 is an exploded perspective view showing in detail a direct type liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 3 is a cross-sectional view of the direct type liquid crystal display shown in FIG. 2 taken along a cutting line A-A '.

4 is a plan view illustrating the direct backlight assembly illustrated in FIG. 2.

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of improving display characteristics.

Recently, with the development of the technology of the information processing apparatus, the development of the technology of the display apparatus for interfacing so that the user can recognize the data processed in the information processing apparatus has been made.

As a display device, a liquid crystal display device having a light weight, a small size, and a function such as full-color and high resolution is widely used. Specifically, the liquid crystal display device is a display device for converting a change in optical properties of the liquid crystal cell into a visual change. Such a liquid crystal display requires light because an image is displayed by using a liquid crystal, which is a light receiving element that does not emit light by itself. Therefore, the liquid crystal display receives light from the backlight assembly attached to the rear surface of the liquid crystal display panel and displays an image.

The backlight assembly is divided into a direct type and an edge type according to the position of the light source. The edge type backlight assembly has a structure in which a lamp unit is installed on the side of the light guide plate, and is mainly applied to a relatively small liquid crystal display device such as a laptop and a desktop computer. Such an edge type backlight assembly has advantages of good light uniformity, long life, and thinning of a liquid crystal display device.

On the other hand, the direct type backlight assembly is a structure mainly developed as the size of the liquid crystal display device increases in size, and one or more lamps are arranged in a row on the lower surface of the diffusion plate to irradiate light on the entire liquid crystal display panel. Such a direct type backlight assembly has advantages in that a plurality of lamps may be used in comparison with an edge type backlight assembly, thereby ensuring high luminance.

1 is an exploded perspective view showing a direct type liquid crystal display device having a conventional direct type backlight assembly.

Referring to FIG. 1, the direct type liquid crystal display device 100 includes a liquid crystal display panel assembly 110 displaying an image and a direct type backlight assembly 120 providing light to the liquid crystal display panel assembly 110. .                         

The liquid crystal display panel assembly 110 may include a liquid crystal display panel 111, a data printed circuit board 115, a gate printed circuit board 114, a data side tape carrier package (hereinafter referred to as TCP) 113, and A gate side TCP 112.

The liquid crystal display panel 111 implements a screen and includes a thin film transistor (TFT) substrate 111a, a color filter substrate 111b facing the TFT substrate 111a, and the TFT substrate 111a. And liquid crystal (not shown) injected between the color filter substrate 111b.

Meanwhile, the direct backlight assembly 120 has one or more lamps 121 for generating first light, a reflector 140 for reflecting the first light, and a uniform luminance distribution by diffusing the first light. And a diffuser plate 122 for emitting the second light and a bottom chassis 123 for accommodating the one or more lamps 121, the reflector plate, and the diffuser plate 122. The diffusion sheet 124 is further provided on the diffusion plate 122 to diffuse the second light.

The bottom chassis 123 is formed in a box shape of a rectangular parallelepiped having an upper surface opened. A storage space having a predetermined depth is formed inside the bottom chassis 123, and a first step 123a is formed at an upper end of the side wall constituting the storage space. The reflecting plate 140 is disposed along the inner surface of the storage space, and the one or more lamps 121 are installed side by side on the reflecting plate 140. In this case, the one or more lamps 121 are completely coupled by being coupled to the conductive sockets 125 installed in the bottom chassis 123 at both ends thereof, and receive power from the outside through the conductive sockets 125. The diffusion plate 122 and the diffusion sheet 124 are seated on the first step 123a.

In this case, a part of the first light is directly incident on the diffusion plate 122, and the other part is reflected toward the diffusion plate 122 through the reflection plate 140. The first light is emitted as the second light by the diffusion plate 122.

The middle chassis 130 is disposed on the diffusion sheet 124, and the liquid crystal display panel 111 is seated on the second step 131 of the middle chassis 130. Thereafter, the top chassis 140 coupled to the bottom chassis 123 is provided on the liquid crystal display panel 111 to complete the direct type liquid crystal display device 100.

Since the conventional direct type liquid crystal display device adopts a direct type backlight assembly structure, it is possible to use a plurality of lamps as compared to the edge type backlight assembly, and thus has a relatively high luminance.

However, this structure uses several lamps, thereby increasing the amount of heat generated from the lamps. Accordingly, a phenomenon occurs in which a plurality of sheets disposed on the one or more lamps are crying by the heat, and the liquid crystal constituting the liquid crystal display panel changes yellow. As described above, the heat generated from the one or more lamps is a factor that lowers the display characteristics of the direct type liquid crystal display.

Accordingly, it is an object of the present invention to provide a liquid crystal display device capable of improving display characteristics.

The liquid crystal display device for achieving the above object of the present invention, a) a lamp for generating light, b) a storage container formed with a storage space for storing the lamp, c) is disposed between the storage container and the lamp, And a heat conductive sheet for transferring heat generated from the lamp to the storage container, and d) a liquid crystal display panel for receiving the light and controlling the transmittance of the light to display an image.

Two or more lamps may be provided and disposed in a parallel manner on a side of the second surface facing the first surface of the liquid crystal display panel implementing the screen. At this time, the heat conduction sheet is disposed at both ends of the plurality of lamps, respectively.

According to the present invention, a liquid crystal display device is disposed between a lamp for generating light and a storage container for storing the lamp, and includes a heat conducting sheet for dissipating heat generated from the lamp to the outside through the storage container. Therefore, it is possible to prevent the deterioration of display characteristics of the liquid crystal display device generated by the heat generated from the lamp.

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

2 is an exploded perspective view showing in detail a direct type liquid crystal display according to an exemplary embodiment of the present invention. FIG. 3 is a cross-sectional view of the direct type liquid crystal display shown in FIG.

2 and 3, the direct type liquid crystal display device 600 includes a liquid crystal display panel assembly 200 displaying an image and a direct type backlight assembly 300 providing light to the liquid crystal display panel assembly 200. It includes.

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 between the TFT substrate 211, the color filter substrate 213 facing the TFT substrate 211, and the TFT substrate 211 and the color filter substrate 213. It is made of a liquid crystal (not shown) injected into.

The TFT substrate 211 is a transparent glass substrate in which a switching element TFT (not shown) is formed in a matrix form. Data and gate lines are respectively connected to the source and gate terminals of the TFTs, and a pixel electrode made of indium tin oxide (ITO), which is a transparent conductive material, is formed at the drain terminal.

The color filter substrate 213 provided to face the TFT substrate 211 is a substrate in which RGB pixels, which are color pixels expressed in a predetermined color by light passing through, are formed by a thin film process. The common electrode made of ITO is coated on the front surface of the color filter substrate 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 connects the gate side TCP 250. It is electrically connected to the gate printed circuit board 230 through. Accordingly, the data and gate printed circuit boards 220 and 230 which receive an electrical signal from the outside may output a driving signal and a timing signal for controlling driving and driving timing of the liquid crystal display panel assembly 200. And through the gate-side TCPs 240 and 250 to the gate line and the data line, respectively.

Meanwhile, the direct type backlight assembly 300 has one or more lamps 310 for generating a first light, a reflector 140 for reflecting the first light, and a uniform luminance distribution by diffusing the first light. A bottom chassis 330 for accommodating the second light to emit the second light, the one or more lamps 310, the reflector and the diffusion plate 320, and the bottom chassis 330 and the one or more lamps ( And a thermally conductive sheet 370, 380 disposed between and for dissipating heat generated from the one or more lamps 310.

The bottom chassis 330 is made of a hard and light material such as aluminum, and is formed in a box shape of a rectangular parallelepiped having an upper surface opened. A storage space having a predetermined depth is formed inside the bottom chassis 330, and a first step 331 is formed at an upper end of the side wall constituting the storage space. The reflecting plate 140 is disposed along the inner surface of the storage space, and the one or more lamps 310 are installed side by side on the reflecting plate 140.

In this case, the one or more lamps 310 are completely coupled to the bottom chassis 330 by being coupled to the first and second conductive sockets 350 and 360 installed at the bottom chassis 330 at both ends 311 and 312, respectively. Combined. In this case, the one or more lamps 310 are driven by receiving power from the outside through the first and second conductive sockets 350 and 360.                     

In detail, the first conductive socket 350 is made of a conductive material, and the first base substrate 351 extends in a direction in which the one or more lamps 310 are arranged, that is, extending in the first direction D1 in the drawing. The first and second pillars 352a and 352b protruding from the first base substrate 351 may include the one or more lamps in an accommodation space formed by the first and second pillars 352a and 352b. And a first clip portion 352 for inserting and fixing the first end 311 of 310.

The second conductive socket 360 has the same structure as the first conductive socket 350, the second base substrate 361 extending in the first direction D1, and the second base substrate 361. And a second clip portion 362 formed of the third and fourth pillars 362a and 362b protruding from each other, and inserting and fixing the second end 312 of the lamp 310.

The first and second pillars 352a and 352b protrude in a second direction D2 orthogonal to the first direction D1 and form a cylindrical shape with one side wall opened. Accordingly, the first end 311 of the lamp 310 is inserted through the opening, and is firmly fixed by the elasticity of the first and second pillars 352a and 352b. In addition, the third and fourth pillars 362a and 362b are formed in the same manner as the first and second pillars 352a and 352b to firmly fix the second end 312 of the one or more lamps 310. Let's do it.

Meanwhile, first and second heat conductive sheets 370 and 380 are disposed between the first and second conductive sockets 350 and 360 and the bottom chassis 330, respectively. The first and second heat conducting sheets 370 and 380 are made of a combination of a silicon (Si) gel and an inorganic material, and have more flexible properties than rubber, and also have excellent thermal conductivity.                     

The silicone gel has a significantly lower crosslink density than silicone rubber, and the basic chemical structure thereof is the same as that of Chemical Formula 1.

When the first and second conductive sockets 350 and 360 directly contact the bottom chassis 330, the contact thermal resistance increases to transfer heat generated from the at least one lamp 310 to the bottom chassis 330. It is difficult to deliver and release. That is, an air layer is formed between the first and second conductive sockets 350 and 360 and the bottom chassis 330, so that heat transfer is not easy.

Accordingly, in the present invention, by using the first and second heat conducting sheets 370 and 380, the contact thermal resistance is reduced to sufficiently transfer heat from the one or more lamps 310 to the bottom chassis 330. do. That is, the first and second heat conducting sheets 370 and 380 have a property of sticking to the surface, thereby preventing an air layer between the contact surface with the bottom chassis 330, and further, the first and second conductive sockets. Prevents air layer formation between contact surfaces 350 and 360.

Such a property is a main cause of disposing the first and second heat conducting sheets 370 and 380 on the bottom chassis 330 without a separate fixing member. That is, since the first and second heat conductive sheets 370 and 380 stick to the surface, the fixing member for coupling the first and second heat conductive sheets 370 and 380 and the bottom chassis 330 to each other. Does not need Thus, the first and second heat conducting sheets 370 and 380 are simply seated in the bottom chassis 330.

In order to improve the thermal conductivity of the first and second thermally conductive sheets 370 and 380, the first and second thermally conductive sheets 370 and 380 may be particularly softened or the thickness may be increased. In this case, when the thicknesses of the first and second heat conducting sheets 370 and 380 are increased, the overall thickness of the liquid crystal display device 600 is increased.

The diffusion plate 320 is seated on the first step 331 of the bottom chassis 330. The diffusion sheet 340 is further provided on the diffusion plate 320 to diffuse the second light. In this case, a predetermined separation space is formed between the one or more lamps 310 and the diffusion plate 320, and the separation space receives the first light generated from the one or more lamps 310 in the diffusion plate. It is a light guide area for guiding to 320.

A portion of the first light is directly incident on the diffuser plate 320, and a portion of the first light is reflected toward the diffuser plate 320 through the reflector plate 140. The first light is emitted as the second light by the diffusion plate 320.

As described above, the reflector plate 340, the first and second heat conducting sheets 370 and 380, the first and second conductive sockets 350 and 360, the lamp 310, and the bottom chassis 330. When the diffusion plate 320 and the diffusion sheet 340 are sequentially received, the middle chassis 400 is provided thereon. The middle chassis 400 fixes the diffusion plate 320 and the diffusion sheet 340 to the bottom chassis 330.

That is, the middle chassis 400 is formed to have a rectangular band shape in which the second stepped portion 410 protruding from the inner wall is formed. Accordingly, the bottom surface of the second step 410 is in contact with the diffusion sheet 340 to press the diffusion plate 320 and the diffusion sheet 340 toward the bottom chassis 330.

On the other hand, the liquid crystal display panel 210 is mounted on an upper surface of the second step 410 of the middle chassis 400, and the data and gate printed circuit boards for controlling the driving of the liquid crystal display panel 210 ( 220 and 230 are bent to the outer surface of the bottom chassis 330 is fixed to the rear surface.

A top chassis having a cramped shape in which an upper and a lower surface of the liquid crystal display panel 210 is coupled to the bottom chassis 330 to fix the liquid crystal display panel 210 to the bottom chassis 330. 500) is provided.

FIG. 4 is a plan view of the direct type backlight assembly shown in FIG. 2. However, in order to reliably indicate the positions of the first and second heat conductive sheets 370 and 380, the first and second conductive sockets 350 and 360 are omitted.

Referring to FIG. 4, the first and second heat conducting sheets 370 and 380 are disposed at the first and second ends 311 and 312 of the one or more lamps 310, respectively. In detail, the one or more lamps 310 receive power from the outside through the first and second ends 311 and 312. Here, the one or more lamps 310 are external electrode lamps, including a working gas (not shown) and a fluorescent material (not shown) inside the tube body 313a and the tube body 313a to generate light. It consists of a lamp tube 313, a first electrode 314 surrounding the outer side of the first end 311 of the lamp tube 313 and a second electrode 315 surrounding the outer side of the second end 312. .

In this case, since voltages for driving the one or more lamps 310 are applied to the first and second electrodes 314 and 315, the first and second ends 311 and 312 of the one or more lamps 310 are provided. The heat is generated the most. Accordingly, the first and second heat conducting sheets 370 and 380 may correspond to the first and second electrodes 314 and 315. The first and second ends 311 and 312 of the one or more lamps 310 may be used. Will be placed on each).

Here, the one or more lamps 310 are formed of the effective light emitting area D in which light is generated except for the areas in which the first and second electrodes 314 and 315 are formed among the lamp tubes 313. do. Accordingly, the first and second heat conducting sheets 370 and 380 are disposed so as not to overlap the effective light emitting area D when viewed from the liquid crystal display panel 210.

Here, although one or more lamps 310 are shown as external electrode lamps, internal electrode lamps may be used for the one or more lamps 310.

According to the liquid crystal display device described above, a heat is disposed between a lamp for generating light and a storage container in which a storage space for accommodating the lamp is formed to transfer heat generated from the lamp to the storage container to be discharged to the outside. A conductive sheet is provided.                     

Therefore, it is possible to prevent the liquid crystal used in the liquid crystal display device from changing yellow or changing the shape of the plurality of sheets by heat generated from the lamp, and further improve the display characteristics of the liquid crystal display device. have.

Although described with reference to the examples, those skilled in the art can understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention described in the claims below. There will be.

Claims (5)

A liquid crystal display panel for displaying an image by controlling light transmittance; A plurality of lamps disposed in a parallel manner on a side of a second surface facing the first surface of the liquid crystal display panel for implementing a screen to provide light to the liquid crystal display panel; Conductive sockets disposed at both ends of the lamps to apply power to external electrodes formed at both ends of the lamps; A storage container formed of a metal material and having a storage space for storing the lamps; And And a heat conduction sheet disposed between the storage container and the conductive socket to transfer heat generated from external electrodes of the lamps to the storage container. delete delete The liquid crystal display device according to claim 1, wherein the heat conducting sheet is made of a combination of a silicon gel and an inorganic material having thermal conductivity. delete

Images