KR101075597B1 - Bottom chassis and liquid crystal display comprising the same - Google Patents

Abstract

The present invention relates to a liquid crystal display device, comprising: a liquid crystal panel; A lamp for irradiating light to the rear of the liquid crystal panel; A lamp holder coupled to an end of the lamp to support the lamp; Optical sheets positioned between the lamp and the liquid crystal panel; And a bottom including a lamp, a lamp holder and an optical sheet, and having a support staircase which is raised in a step shape along at least one side of the bottom and the bottom to support the side ends of the optical sheets and has an opening for accommodating the lamp holder. It is characterized by including a chassis. As a result, the heat radiation efficiency and the lamp efficiency can be increased.

Description

Bottom chassis and liquid crystal display including the same {BOTTOM CHASSIS AND LIQUID CRYSTAL DISPLAY COMPRISING THE SAME}

1 is a perspective view of main parts of a conventional liquid crystal display device;

2 is an exploded perspective view of a liquid crystal display device according to the present invention;

3 is an essential part perspective view of a liquid crystal display device according to the present invention;

It is sectional drawing along the IV-IV line | wire of FIG.

Explanation of Signs of Major Parts of Drawings

1 liquid crystal display 10 top chassis

20 liquid crystal display panel 21 front polarizer

23 color filter substrate 25 thin film transistor substrate

27: rear polarizer 40: optical sheet

41: protective sheet 43: prism sheet

45 diffuser 50 lamp

60: lamp holder 65: reflective sheet

70: backlight assembly 80: bottom chassis

81: bottom 82: diffuser plate support surface

83 prism sheet support surface 84 liquid crystal panel support surface                 

85: support stairs 86: the upper surface of the lamp holder

87: opening 100: side mold

110: hall

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having an improved structure of a bottom chassis.

In general, a liquid crystal display is a device that displays a desired image by adjusting the light transmittance of liquid crystal cells arranged in a matrix form according to image signal information.

Such a liquid crystal display is not self-emission and displays a screen by using light emitted from the backlight assembly. Accordingly, a backlight assembly including a lamp and a diffusion plate is provided on the rear surface of the liquid crystal panel forming the image. The backlight assembly is classified into an edge method and a direct method according to the location where the lamp is installed.

The direct method is a method of irradiating light directly to a liquid crystal panel by arranging a plurality of lamps in a row on the back of the diffusion plate. The direct method is mainly used in large liquid crystal display devices that require high brightness due to the low light uniformity and durability but good light efficiency compared to the edge method.

As shown in FIG. 1, in the conventional direct type backlight, the side reflection of the light of the lamp 50 is performed on the side surface of the bottom chassis 80 to support the liquid crystal panel and the diffusion plate positioned on the lamp 50. Side mold 100 was placed. Then, the hole 110 is inserted into the side mold side is inserted into the lamp 110, the lamp holder 60 is located in the side mold 100 so that the end of the lamp 50 through the hole 110 To the holder 60.

However, since the side mold 100 having poor thermal conductivity has a structure surrounding the lamp holder 60, there is a problem in that the heat generated from the electrode portion of the lamp 50 may not be effectively released.

Accordingly, an object of the present invention is to provide a liquid crystal display device having good heat dissipation efficiency and lamp efficiency.

The object is a liquid crystal panel; A lamp for irradiating light to the rear of the liquid crystal panel; A lamp holder coupled to an end of the lamp to support the lamp; Optical sheets positioned between the lamp and the liquid crystal panel; And a bottom including a lamp, a lamp holder and an optical sheet, and having a support staircase which is raised in a step shape along at least one side of the bottom and the bottom to support the side ends of the optical sheets and has an opening for accommodating the lamp holder. It is achieved by a liquid crystal display device comprising a chassis.

Here, it is preferable to include a side mold which covers the lamp holder and the support staircase and supports the optical sheet.

In addition, the optical sheet includes a diffusion plate and a prism sheet, and the support stair portion preferably includes a diffusion plate support surface for supporting the diffusion plate and a prism sheet support surface for supporting the prism sheet.

The support staircase includes a diffusion plate support surface for supporting the diffusion plate and a prism sheet support surface for supporting the prism sheet, and the opening is preferably formed on the diffusion plate support surface.

In addition, it is preferable that the liquid crystal panel support surface for supporting the liquid crystal panel is formed in the support stair part.

And, it includes a reflective sheet located between the lamp and the bottom chassis, the reflective sheet is preferably covered along the surface of the bottom and the support stair.

Here, the lamp holder accommodated in the opening is preferably supported by a surface extending from the bottom of the bottom chassis.

In addition, the lamp holder is preferably accommodated in the opening formed in the support stair portion is coupled to the bottom chassis.

The support staircase includes a diffuser plate support surface, and the upper surface of the lamp holder is preferably horizontal with the diffuser plate support surface.

In addition, the upper surface of the lamp holder is preferably lower than the diffusion plate support surface.

The object of the present invention is achieved by a bottom chassis characterized in that it comprises a bottom and a support staircase which is raised in a step shape along at least one side of the bottom and has an opening for accommodating the lamp holder.

Hereinafter, a liquid crystal display according to the present invention will be described in detail with reference to the drawings. Prior to the description, the liquid crystal display device shown in the present specification is schematically illustrated by taking an example of a liquid crystal display device having a direct type backlight assembly and highlighting its features.

As shown in FIG. 2, the liquid crystal display device 1 according to an exemplary embodiment of the present invention includes a liquid crystal panel 20 for forming an image and a driver integrated circuit (not shown) for driving the liquid crystal panel 20. And a mold frame 30 for supporting the liquid crystal panel 20 spaced apart from the optical sheets 40, a backlight assembly 70 for irradiating light to the rear surface of the mold frame 30, and a backlight assembly 70. A bottom chassis 80 for accommodating the top chassis and a top chassis 10 coupled to the bottom chassis 80 to cover the front surface of the liquid crystal panel 20 are included.

The liquid crystal panel 20 is injected between the thin film transistor substrate 25, the color filter substrate 23 attached to face the thin film transistor substrate 25, and the thin film transistor substrate 25 and the color filter substrate 23. It includes a liquid crystal (not shown). The liquid crystal (not shown) is injected between the thin film transistor substrate 25 and the color filter substrate 23 and then sealed. In addition, the liquid crystal panel 20 further includes a front polarizer 21 attached to the front surface of the color filter substrate 23 and a rear polarizer 27 attached to the rear surface of the thin film transistor substrate 25. The liquid crystal panel 20 is arranged in a matrix form of the liquid crystal cells forming a pixel unit, and forms an image by adjusting the light transmittance of the liquid crystal cells according to the image signal information transmitted from the driver integrated circuit (not shown).

A plurality of gate wirings and a plurality of data wirings are formed in a matrix form on the thin film transistor substrate 25, and a pixel electrode and a thin film transistor (TFT) are formed at the intersection of the gate wiring and the data wiring. The signal voltage applied through the thin film transistor is applied to the liquid crystal (not shown) by the pixel electrode, and the liquid crystal (not shown) is aligned according to the signal voltage to determine the light transmittance.

The color filter substrate 23 is formed with a color filter and a common electrode formed of RGB pixels through which light passes and a predetermined color is expressed. The common electrode is made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). The color filter substrate 23 has a smaller area than the thin film transistor substrate 25 because the driver integrated circuit and the PCB are coupled to the side end of the thin film transistor substrate 25.

The front flat plate 21 and the rear polarizer 27 are arranged to cross-polarize each other, the rear polarizer 27 polarizes the light incident on the liquid crystal panel 20, and the front polarizer 21 serves as an analyzer. .

The driver integrated circuit (not shown) has terminals for electrically connecting, and ends of the gate wiring and the data wiring of the thin film transistor substrate 25 mounted on the thin film transistor substrate 25 and extending from the display area to the non-display area. Is connected to.

The backlight assembly 70 is connected to the lamp 50 and the bottom chassis 80 that irradiate light to the rear surface of the liquid crystal panel 20 through the optical sheets 40 disposed in parallel to the rear surface of the liquid crystal panel 20. The lamp holder 60 which is fixed and supports the lamp 50, and is provided between the lamp 50 and the bottom chassis 80, and the light irradiated from the lamp 50 is uniformly spread, so that all of the back of the liquid crystal panel 20 It includes a reflective sheet 65 facing toward.                     

Here, the bottom chassis 80 is stepped along the bottom 81 and at least one side of the bottom 81 is formed with a support step 85 for supporting the side ends of the optical sheet (40). It is.

In the embodiment according to the present invention, as shown in Figures 2 and 3, the support staircase 85 is formed in a three-step staircase shape, one end to support the side end of the diffusion plate 45 A diffusion plate support surface 82 for the second stage, and a prism sheet support surface 83 for supporting the prism sheet 43 and the protective sheet 41, and three stages of the liquid crystal for supporting the liquid crystal panel 20. It becomes the panel support surface 84.

Unlike the above embodiment, the support stairs 85 may be formed in one or more stages to support the liquid crystal panel 20 and the optical sheets 40, respectively. Further, in order to support the optical sheets 40 such as the diffusion plate 45, the prism sheet 43, and the protective sheet 41, each of the plurality of stages may be formed.

In addition, an opening 87 is provided at the support stairway 85 of the bottom chassis 80, and an end of the lamp 50 is coupled to the opening 87 to support the lamp holder 60. Are accepted. That is, the support staircase 85 is stepped and the place where the lamp holder 60 is located is open, so that the lamp holder 60 is exposed. In the embodiment according to the present invention, the bottom chassis surface to which the lamp holder 60 is coupled is fully open. By such a structure, the heat generated in the electrode portion of the lamp 50 coupled to the lamp holder 60 can be blown off efficiently.

Here, the side mold 100 covering the lamp holder 60 and the support stairs 85 may be further coupled. In this case, the diffusion plate 45 is supported on the upper surface of the side mold 100. Side mold 100 may be manufactured in a step shape as shown in the drawings of the present invention, the side mold 100 of the same shape as the conventional may also be applied. That is, any shape can be applied to the present invention as long as it is a shape suitable for the function of supporting the optical sheets 40.

However, in another embodiment, the bottom chassis 80 may be manufactured in a structure that supports the lamp holder 60 by a surface extending from the bottom portion 81. The bottom surface 81 may be formed to have a structure that supports the bottom surface or the bottom surface and side surfaces of the lamp holder 60. Alternatively, the bottom chassis 80 may be manufactured in a structure in which only a side surface of the lamp holder 60 is supported. In this case, the lamp holder 60 is in direct contact with the surface of the bottom chassis 80, thereby effectively dissipating heat generated from the lamp electrode portion, thereby increasing the heat dissipation efficiency of the backlight assembly. In addition, the lamp holder 60 may be coupled to a surface extending from the bottom portion 81.

When the lamp holder 60 is accommodated in the opening 87 formed in the support stairway 85, the diffusion plate support surface 82 and the lamp holder upper surface 86 support the diffusion plate 45 while being horizontal. The side end of the diffusion plate 45 is supported on the horizontal surface.

Unlike the above embodiment, the lamp holder upper surface 86 may be lower than the diffusion plate support surface 82 to improve the heat dissipation efficiency of the lamp. The lamp holder 60 accommodated in the opening 87 is coupled to the bottom chassis 80.

Here, the reflective sheet 65 covers the surface of the bottom 81 and the support staircase 85 of the bottom chassis 80. Since the reflection sheet 65 is covered on the surfaces of the diffusion plate support surface 82, the prism sheet support surface 83, and the liquid crystal panel support surface 84, the diffusion plate 45, the prism sheet 43, and the liquid crystal panel ( The side end of 20 is in contact with and supported by the reflective sheet 65. Since the reflective sheet 65 is covered only on the surface of the bottom chassis 80, it is not covered by the lamp holder upper surface 86 accommodated in the opening 87. The diffusion plates 45, the prism sheet 43, and the liquid crystal panel 20 may be spaced apart at predetermined intervals by the supporting surfaces, and the supported positions may be clearly distinguished so that the liquid crystal display device 1 The assembly can be improved during the assembly process. In addition, the volcanic plate 45, the prism sheet 43, the protective sheet 41, and the liquid crystal panel 20 can be stably supported.

With this arrangement, the assembling process of the liquid crystal display device 1 according to the exemplary embodiment of the present invention will be described with reference to FIGS. 2 to 4. First, the lamp holder 60 to which the lamp 50 is coupled is accommodated in the opening 87 of the bottom chassis 80 to which the reflective sheet 65 is attached. Then, the lamp 50 and the lamp holder 60 is accommodated in the bottom chassis 80, the lamp holder 60 is coupled to the bottom chassis 80 to be fixed. The diffusion plate 45 is disposed on the diffusion plate support surface 82 and the lamp holder upper surface 86. Although not shown, one end of the diffusion plate 45 is coupled to the bottom chassis 80 to be stably supported without moving. The prism sheet 43, the protective sheet 41, and the liquid crystal panel 20 are disposed on the prism sheet support surface 83 and the liquid crystal panel support surface 84.

Here, the mold frame 30 having a quadrangular shape along the edge of the liquid crystal panel 20 and spaced apart from the diffusion plate 45 to support the liquid crystal panel 20 may be excluded and may be used separately to clearly distinguish. have. However, even without the mold frame 30, the structure of the bottom chassis 80 may sufficiently complement the role of the conventional mold frame 30.

One end of the prism sheet 43 and the protective sheet 41 is coupled to the bottom chassis 80 and stably supported. The liquid crystal display device 1 is completed by arranging the top chassis 10 to cover and couple the liquid crystal panel 20.

By using the bottom chassis 80 having the above structure, the lamp holder 60 is accommodated in the opening 87 and simply coupled to the bottom chassis 80, thereby improving the assembling convenience of the backlight assembly 70. In particular, the lamp holder 60 to which the end of the lamp 50 is coupled is exposed, thereby effectively dissipating heat generated from the lamp electrode part. In particular, the bottom portion 81 and the support stair part 85 of the bottom chassis 80 having the opening 87 are opened to effectively release heat generated from the lamp electrode part, thereby increasing the heat dissipation efficiency of the backlight assembly. do.

The reflective sheet 65 positioned between the lamp 50 and the bottom chassis 80 covers the surface of the bottom 81 and the support stairway 85 of the bottom chassis 80, thereby reflecting the side surface of the light. Becomes possible, and the efficiency of the lamp 50 is increased.

As described above, according to the present invention, a liquid crystal display device having good heat dissipation efficiency and lamp efficiency can be provided.

Claims (11)

A liquid crystal panel; A lamp for irradiating light to the rear of the liquid crystal panel; A lamp holder coupled to an end of the lamp to support the lamp; Optical sheets positioned between the lamp and the liquid crystal panel; And The lamp, the lamp holder and the optical sheet is accommodated, the step is raised along at least one side of the bottom and the bottom portion to support the side end portion of the optical sheet and an opening for receiving the lamp holder is provided Including a bottom chassis formed with a support stair, And a portion of the support staircase in which the lamp holder is located is open to expose the lamp holder. The method of claim 1, And a side mold covering the lamp holder and the support stair part and supporting the optical sheets. The method of claim 1, The optical sheet includes a diffusion plate and a prism sheet, The support staircase is formed with a diffusion plate support surface for supporting the diffusion plate and a prism sheet support surface for supporting the prism sheet. The method of claim 1, The support staircase includes a diffusion plate support surface for supporting the diffusion plate and a prism sheet support surface for supporting the prism sheet, And the opening is formed in the diffusion plate support surface. The method of claim 1, And a liquid crystal panel support surface for supporting the liquid crystal panel at the support stair portion. The method of claim 1, It includes a reflective sheet located between the lamp and the bottom chassis, And the reflective sheet covers the bottom and the support stairs. The method of claim 1, And the lamp holder accommodated in the opening is supported by a surface extending from the bottom of the bottom chassis. The method of claim 1, And the lamp holder is accommodated in the opening formed in the support stair part and coupled to the bottom chassis. The method of claim 1, The support staircase includes a diffusion plate support surface, And an upper surface of the lamp holder is flush with the diffusion plate support surface. The method of claim 9, And an upper surface of the lamp holder is lower than the diffusion plate supporting surface. Bottom View, A support staircase which is raised in a step shape along at least one side of the bottom and has an opening for receiving a lamp holder, A bottom chassis, wherein the portion of the lamp holder is located in the support staircase is open to expose the lamp holder.

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