KR20080030755A - Liquid crystal display - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to miniaturize the whole of an LCD and reduce a manufacturing cost by modifying the structure of the LCD in which a liquid crystal panel driving board is installed. An LCD comprises a light source unit, a liquid crystal panel, optical sheets, a mold frame, fixing members(24), a liquid crystal panel driving board(31), and a top chassis. The light source unit generates light. The optical sheets are arranged between the light source unit and the liquid crystal panel. The mold frame has an inner lateral and an outer lateral. The light source unit, the liquid crystal panel, and the optical sheets are mounted at the inner lateral of the mold frame. The fixing member is formed at the outer lateral of the mold frame. The liquid crystal panel driving board, where liquid crystal panel driving components(41) are mounted, is put on the top of the fixing members. The top chassis, enclosing the side of the mold frame, is put on the upper part of the liquid crystal panel. The liquid crystal panel driving components are arranged at a space which is formed between the liquid crystal panel driving board and the outer lateral of the mold frame and by the fixing members.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY}

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

FIG. 2 is a rear view of FIG. 1;

3 is a side cross-sectional view cut out and partially enlarged in FIG. 2;

4 is a side cross-sectional view of a portion of a liquid crystal display according to a second exemplary embodiment of the present invention, cut out and enlarged.

* Explanation of symbols for main parts of the drawings

24, 25: fixed member 26: protective member

31, 32: board for driving liquid crystal display panel

41, 42: liquid crystal display panel drive component

70: liquid crystal display 71: top chassis

72: optical sheet 73: reflector

74: light guide plate 76: light source

78: light source accommodating part 75: mold frame

701: thin film transistor substrate 703: color filter substrate

704, 705: circuit board 706, 707: driving chip

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a structure of a liquid crystal display device in which a liquid crystal display panel drive board is mounted on a lower surface of a mold frame in order to make the liquid crystal display device compact and thin.

Cathode ray tube (CRT), one of the widely used display devices, is mainly used for monitors such as TVs, measuring devices, and information terminals.However, due to the weight and size of the CRT itself, Could not respond actively to the demand. In order to replace the CRT, liquid crystal display devices having the advantages of miniaturization and thinning have been actively developed, and recently, the liquid crystal display device has been developed to be sufficiently capable of performing a role as a flat panel display device, and the demand for the liquid crystal display device is increasing.

Since the liquid crystal display is a non-light emitting device that does not emit light by itself, a backlight unit for supplying light is required in a commonly used transmissive liquid crystal display.

The backlight unit includes a light source unit, a light guide plate and an optical sheet, a mold frame for accommodating and fixing the light source unit, the light guide plate and the optical sheet, and a top chassis coupled to the mold frame.

On the other hand, when a liquid crystal display panel driving board is added, the liquid crystal display panel is assembled by assembling the liquid crystal display panel driving board in a free space created by using an inclined light guide plate or by mounting the liquid crystal display panel driving board on the back of the backlight unit. The driving board is protruding so that it is not visible.

However, when the liquid crystal display panel driving board is mounted on the back of the backlight unit, the entire liquid crystal display device becomes thick by mounting the liquid crystal display panel driving board on the lower surface of the mold frame.

Accordingly, the technical problem to be solved by the present invention is to solve such a problem and to reduce the size and thickness of the entire liquid crystal display device by changing the structure of the liquid crystal display device on which the liquid crystal display panel driving board is mounted.

The liquid crystal display according to the first embodiment of the present invention includes a light source unit for generating light, a liquid crystal display panel, an optical sheet disposed between the light source unit and the liquid crystal display panel, the light source unit having an inner side and an outer side; A mold frame for accommodating the optical sheet and the liquid crystal display panel on the inner surface, a fixing member formed on an outer surface of the mold frame, and a liquid crystal display panel driving mounted on the fixing member and mounting a liquid crystal display panel driving component; And a top chassis bent over a side portion of the mold board and the mold frame and mounted on an upper portion of the liquid crystal display panel, wherein the liquid crystal display panel driving component includes an outer portion of the liquid crystal display panel driving board and the mold frame. It is arrange | positioned in the space formed by the said fixing member between side surfaces.

The liquid crystal display according to the second exemplary embodiment of the present invention has a light source unit for generating light, a liquid crystal display panel, an optical sheet disposed between the light source unit and the liquid crystal display panel, an inner side surface and an outer side surface, and the light source unit A liquid crystal display panel drive board accommodating the optical sheet and the liquid crystal display panel on the inner side, a mold frame having a cutout portion, a liquid crystal display panel drive board housed in a cutout portion of the mold frame, and mounting a liquid crystal display panel drive component; A protection member covering the liquid crystal display panel driving component, and a top chassis bent over a side portion of the mold frame and placed on the upper portion of the liquid crystal display panel.

In the liquid crystal display panel driving board, the rear surface of the liquid crystal display panel driving board may be in contact with the light source unit.

The liquid crystal display may further include a fixing member configured to press an edge of the liquid crystal display panel driving board and to fix the edge in the cutout of the mold frame.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a portion of a layer, film, region, plate, etc. is said to be "on top" of another part, this includes not only when the other part is "right over" but also when there is another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

In the following embodiments, the same reference numerals refer to the same components. The same components are representatively described in the first embodiment and may be omitted in other embodiments.

A liquid crystal display 70 according to a first exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

FIG. 1 is an exploded perspective view of a liquid crystal display 70 according to a first embodiment of the present invention, FIG. 2 is a rear view of FIG. 1, and FIG. 3 is a side cross-sectional view of a portion of FIG.

A cold cathode fluorescent lamp (CCFL) is used as the light source 76 of the light source units 76 and 78 shown in the drawing, and is provided in an edge type. The shape and type of the light source 76 and the shape and type of the light guide plate 74 are not limited thereto, and various applications are possible. In addition, an LED may be used as the light source units 76 and 78.

The liquid crystal display device 70 includes a liquid crystal display panel 701 to 709, an optical sheet 72 disposed on the rear surface of the liquid crystal display panels 701 to 709, and a light source unit disposed on the rear surface of the liquid crystal display panels 701 to 709 ( 76, 78, a light guide plate 74 for guiding light emitted from the light source units 76, 78, a reflector plate 73 for reflecting light emitted from the light source units 76, 78, and a top chassis 71 containing them. ) And the mold frame 75.

The liquid crystal display panels 701 to 709 bond the thin film transistor substrate 701 on which the thin film transistors are formed, the color filter substrate 703 facing the thin film transistor substrate 701, and the two substrates 701, 703, and the cell gap. a sealant (not shown) forming a cell gap, and a liquid crystal layer (not shown) positioned between the substrates 701 and 703 and the sealant. The liquid crystal display panels 701 to 709 form a screen by adjusting the arrangement of the liquid crystal layers, but since the liquid crystal display panels are non-light emitting devices, light must be supplied from the light source units 76 and 78 located on the rear surface. Drivers 704 to 709 are provided on the side of the thin film transistor substrate 701 to apply a drive signal.

The driving units 704 to 709 may include the driving chips 706 and 707 and the flexible printed circuit boards 708 and 709 mounted on the flexible printed circuit boards FPC, 708 and 709 and the flexible printed circuit boards 708 and 709. It includes a circuit board (PCB, 704, 705) connected to the other side. The driving units 704 to 709 illustrated in FIG. 1 represent a chip on film (COF) method, and other known methods such as a tape carrier package (TCP) and a chip on glass (COG) may be used. In addition, the driving units 704 to 709 may be mounted on the thin film transistor substrate 701.

The optical sheet 72 is positioned between the liquid crystal display panels 701 to 709 and the light source units 76 and 78, and is attached to the transparent plate and the transparent film surface facing the liquid crystal display panels 701 to 709. A diffusion film attached to the transparent plate surface facing the units 76, 78.

As the optical film according to the first embodiment of the present invention, a prism film was used. The prism film may have a triangular pillar-shaped condensing pattern formed on the upper surface thereof, and may condense the light diffused from the diffusion film in a direction perpendicular to the plane of the upper liquid crystal display panels 701 to 709. do. The light passing through the prism film almost passes vertically to provide a uniform luminance distribution.

Alternatively, the optical film may be a reflective polarizing film or a prism film and a reflective polarizing film may be used in one piece.

The reflective polarizing film passes a specific kind of polarizing component and reflects the other polarizing component. That is, when unpolarized natural light emitted from the light source units 76 and 78 is incident on the reflective polarizing film, only a specific polarization component is passed, and other polarization components are reflected. Thereafter, the reflected polarization component is reflected again by the reflecting plate 73 or the like to change the polarization state, and is incident again on the reflective polarization film so that only a specific polarization component is transmitted again. By repeating this process, almost all components of the light can be used to increase the brightness.

As the reflective polarizing film, a dual brightness enhancement film (DBEF), a cholesteric liquid crystal film (CLCF), or a diffuse reflective polarizer film (DRPF) may be used. Here, the reflective polarizing film is not limited, but may be made of polyethylene resin, for example, polyethylene naphthalate (hereinafter referred to as 'PEN'), PEN copolymer, or the like. In addition, a polycarbonate member may be deposited or coated on the entrance or exit surface of the reflective polarizing film.

The diffusion film may diffuse light from the light source units 76 and 78 to supply light to the transparent plate, and may be one in which acrylic beads are coated on the polyethylene film. Since the lamps of the light source units 76 and 78 are likely to be recognized by the user as the line light source, the diffusion film prevents this and makes the luminance uniform. The diffusion film preferably has a transmittance of 50% or less in order to prevent recognition of the arrangement patterns of the light source units 76 and 78. In the case of two or more diffusion films having a transmittance of more than 50%, the transmittance condition may be satisfied.

The light source units 76, 78 include a plurality of light sources 76 arranged parallel to each other. The light source 76 is disposed on the rear surface of the liquid crystal display panels 701 to 709. Both ends of the light source 76 are electrode parts (not shown) and are accommodated in the light source accommodating part 78.

The light source accommodating part 78 may be disposed in the side mold through an accommodation groove (not shown) formed in the side mold (not shown) so as not to be exposed.

The light guide plate 74 has an incidence surface receiving light from the light source units 76 and 78, an emission surface parallel to the liquid crystal panel at right angles to the incidence surface, and light irradiated from the light source units 76 and 78 to the incidence surface. It has the back surface in which the pattern was formed so that it might advance to this exit surface. Accordingly, the light guide plate 74 converts the light irradiated from the light source units 76 and 78 disposed adjacent to the incident surface of the light guide plate 74 into the incident light into planar light, and then, through the emission surface, the liquid crystal display panels 701 to 709. To be delivered uniformly. As the material of the light guide plate 74, PMMA (Polymethylmethacrylate) having high strength is not easily deformed or broken and has good transmittance.

The reflector 73 is positioned below the light source units 76 and 78 to reflect the light of the light source units 76 and 78 to supply the light toward the optical sheet 72. The reflective plate 73 may be made of polyethylene terephthalate (PET) or polycarbonate (PC).

The liquid crystal display panels 701 to 709, the optical sheet 72, the light source units 76 and 78, the light guide plate 74, and the reflecting plate 73 described above have an inner side and an outer side, and the inner side of the mold frame 75. And a predetermined end is bent while surrounding the side of the mold frame is accommodated in the top chassis 71 mounted on the upper portion of the liquid crystal display panel.

The liquid crystal display panel drive board 31 having the liquid crystal display panel drive component 41 mounted thereon includes liquid crystal display panels 701 to 709 of the mold frame 75, an optical sheet 72, light source units 76 and 78, The light guide plate 74 and the reflecting plate 73 are mounted on the outer surface opposite to the accommodation space. The component mounting surface on which the liquid crystal display panel driving component 41 of the liquid crystal display panel driving board 31 is mounted faces the outer surface opposite to the accommodation space of the mold frame 75, and the component mounting surface has a plurality of component mounting surfaces. Can be supported by two fixing members 24. In this case, since the component mounting surface faces the receiving space, it is not necessary to use a protective member used for component protection and antistatic purposes, thereby reducing the thickness of the entire liquid crystal display 70 and reducing component cost. It can also have an effect.

However, in this case, the fixing member 24 may be longer so that the liquid crystal display panel driving component 41 mounted on the component mounting surface is spaced apart from the mold frame 75.

4 is a side cross-sectional view of a portion of the liquid crystal display 70 according to the second exemplary embodiment of the present invention, cut out and enlarged.

As shown in FIG. 4, some side surfaces of the liquid crystal display panel driving board 32 may be accommodated in the cutout of the mold frame 75 having the cutout. At this time, the component mounting surface on which the liquid crystal display panel driving component 42 is mounted is different from the first embodiment in the mold frame 75, the liquid crystal display panels 701 to 709, the optical sheet 72, and the light source unit 76. 78, the light guide plate 74 and the reflecting plate 73 face opposite sides, and the rear surface of the liquid crystal display panel driving board 32 is in contact with the parts accommodated in the accommodation space of the mold frame 75. According to the second embodiment of the present invention, the reflective plate 73 may be in contact with the light guide plate 74 or another component when the reflective plate 73 is not present.

When the liquid crystal display device 70 is normally placed, the component mounting surface faces to the opposite side of gravity, so that the fixing member 25 which presses the edge of the liquid crystal display panel driving board 32 and fixes it in the cutout of the mold frame 75. Can be fixed using).

The protection member 26 may be used to protect the liquid crystal display panel driving component 42 mounted on the liquid crystal display panel driving board 32. The protective member 26 may be fixed to the mold frame 75 using various types of fixing means.

In the liquid crystal display device 70 according to the second exemplary embodiment of the present invention, the liquid crystal display panel driving board 32 is disposed in a cutout portion in which a part of the mold frame 75 is cut off, so that the entire liquid crystal display device 70 The thickness can be reduced.

The liquid crystal display panels accommodated in the cutouts of the liquid crystal display panels 701 to 709, the optical sheet 72, the light source units 76 and 78, the light guide plate 74, the reflecting plate 73, and the mold frame 75 described above. The driving board 32 is in contact with the reflecting plate 73, and a predetermined end portion of the driving board 32 is bent while covering the inner side of the mold frame 75 having an inner side and an outer side and a side portion of the mold frame, thereby forming an upper portion of the liquid crystal display panel. It is housed in the top chassis 71 mounted on it.

Here, the rear surface of the liquid crystal display panel driving board 32 may be in contact with the light source units 76 and 78, and in the second embodiment, is in contact with the reflecting plate 73.

Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of the invention.

As described above, by changing the structure of the liquid crystal display device in which the liquid crystal display panel driving board is mounted, the entire liquid crystal display device can be made compact and thin, and the cost of parts can be reduced.

Claims (4)

Light source unit for generating light, Liquid crystal display panel, An optical sheet disposed between the light source unit and the liquid crystal display panel, A mold frame having an inner side and an outer side and accommodating the light source unit, the optical sheet and the liquid crystal display panel on the inner side; A fixing member formed on an outer surface of the mold frame, A liquid crystal display panel driving board mounted on the fixing member and mounting a liquid crystal display panel driving component; A top chassis having a predetermined end bent and covering the side of the mold frame to be placed on the liquid crystal display panel. Including, And the liquid crystal display panel driving component is disposed in a space formed by the fixing member between the liquid crystal display panel driving board and an outer surface of the mold frame. Light source unit for generating light, Liquid crystal display panel, An optical sheet disposed between the light source unit and the liquid crystal display panel, A mold frame having an inner side and an outer side and accommodating the light source unit, the optical sheet and the liquid crystal display panel on the inner side, and having a cutout; A liquid crystal display panel drive board accommodated in a cutout of the mold frame and mounting a liquid crystal display panel drive component; A protective member covering the liquid crystal display panel drive component; A top chassis having a predetermined end bent and covering the side of the mold frame to be placed on the liquid crystal display panel. Liquid crystal display comprising a. In claim 2, And a rear surface of the liquid crystal display panel driving board is in contact with the light source unit. In claim 3, And a fixing member which presses an edge of the liquid crystal display panel driving board and fixes the edge of the mold frame in the cutout portion of the mold frame.

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