KR20080035743A - Mold frame and liquid crystaldisplay device having the same - Google Patents

Abstract

A mold frame and an LCD(Liquid Crystal Display) having the same are provided to form plural hollows in a middle mold frame and a side mold frame, thereby preventing heat generated from a light source unit from being transferred to an LCD panel. A middle mold frame(700) comprises the followings. A plane unit(710) is formed in a rectangular frame shape. A rib(730) is vertically protruded within the plane unit. A side wall part(720) is vertically and downwardly bent from the outside of the plane unit. Within at least one of the plane unit, the rib and the side wall part, plural hollows(740) are formed. In the hollow, one of air, gas and fluid is included. The mold frame further comprises a side mold frame for receiving a part of a light source unit. Within the side mold frame, plural hollows are formed.

Description

MOLD FRAME AND LIQUID CRYSTALDISPLAY DEVICE HAVING THE SAME}

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 illustrating a liquid crystal display according to a first exemplary embodiment of the present invention.

3 is a schematic cross-sectional view showing a part of the middle mold frame according to the first embodiment of the present invention.

4 is a schematic cross-sectional view showing a part of the side mold frame according to the first embodiment of the present invention.

5 is an exploded perspective view illustrating a liquid crystal display according to a second exemplary embodiment of the present invention.

6 is a cross-sectional view illustrating a liquid crystal display according to a second exemplary embodiment of 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: diffusion sheet 600: prism sheet

700: middle mold frame 740: hollow

800: side mold frame 880: light source receiving groove

910: lower chassis 920: upper chassis

The present invention relates to a liquid crystal display device, and more particularly, to a mold frame for preventing heat generated from a light source from being transferred to a liquid crystal display panel, and a liquid crystal display device having the same.

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 use about 20 to 50 Cold Cathod Flourscent Lamps (CCFLs), and heat generated from the light sources is transferred into the backlight assembly, and passes through the backlight assembly to the liquid crystal display panel. It has a form to be delivered. That is, since the heat is transferred to the liquid crystal display panel by the mold frame supporting the liquid crystal display panel, temperature deviation occurs at the edge of the liquid crystal display panel. Therefore, the heat as described above causes a problem of deterioration of the liquid crystal of the liquid crystal display panel, thereby causing a luminance deviation, thereby causing a problem of reducing the light efficiency of the liquid crystal display device.

In addition, studies have been 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 use of the heat dissipation member may increase the thickness of the liquid crystal display, It causes problems of reduced brightness, increased workability and increased price.

In order to solve the above problems, an object of the present invention is to provide a mold frame and a liquid crystal display device having the same to improve the light efficiency by preventing the heat generated from the light source is transferred to the liquid crystal display panel.

In order to achieve the above object, the mold frame of the present invention and a liquid crystal display device having the same include a liquid crystal display panel, a light source unit for providing light to the liquid crystal display panel, and an optical sheet for providing a path of light generated from the light source unit. And a mold frame configured to receive a backlight assembly, and a liquid crystal display panel mounted thereon, and accommodate the backlight assembly, wherein a plurality of hollows are formed in the mold frame.

The mold frame includes a planar portion having a rectangular frame shape, a rib formed to protrude horizontally inwardly of the planar portion, and a sidewall portion vertically bent from the outside of the planar portion to at least one of the planar portion, the ribs, and the sidewall portion. It characterized in that the hollow is formed in.

Further comprising a side mold frame for receiving a portion of the light source, characterized in that the hollow inside the side mold frame.

The side mold frame may include a first sidewall, a second sidewall facing the first sidewall and smaller than a length of the first sidewall, a first planar portion connecting one end of the first sidewall and the second sidewall; A second planar portion connected to the other end of the second sidewall, an inclined portion connected to the second planar portion, and a third sidewall formed parallel to the first sidewall from the inclined portion, wherein the hollow is formed in the inclined portion It features.

It further comprises a light guide plate coupled to one side of the light source.

The hollow size is characterized in that 10 to 50 micrometers.

The hollow is characterized in that any one of air, gas and fluid included.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments are intended to complete the disclosure of the present invention, the scope of the invention to those skilled in the art 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 device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating a liquid crystal display device according to a first embodiment of the present invention, and FIG. 3 is a first view of the first embodiment of the present invention. 4 is a schematic cross-sectional view showing a part of the middle mold frame according to the embodiment, and FIG. 4 is a schematic cross-sectional view showing a part of the side mold frame according to the first embodiment of the present 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.

Accordingly, the CF substrate 110 and the TFT substrate 120 having the above-described 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 TFT. After dropping onto the substrate 120, the CF substrate 110 and the TFT substrate 120 are bonded to each other to complete the liquid crystal display panel 100.

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, a diffusion sheet 500 provided on the light source unit 300, and the diffusion sheet 500. It includes a prism sheet 600 provided in the upper portion.

The light source unit 300 includes a plurality of rod-shaped lamps 310 arranged in parallel, and a lamp support part 320 for fixing and supporting the lamps 310.

The plurality of lamps 310 mainly uses cold cathode fluorescent lamps, and each lamp 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. 320 serves to fix the plurality of lamps 310.

In the present invention, a cold cathode fluorescent lamp is shown as an example of the light source, but this is merely to illustrate the present invention, and the present invention is not limited thereto, and a light emitting diode (LED) may be used as the light source. .

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 diffusion sheet 500 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. It diffuses light so as to irradiate the liquid crystal display. In this case, beads may be further formed below the diffusion sheet 500.

The prism sheet 600 may be provided as a plurality of sheets on the diffusion sheet 500, and the light diffused from the diffusion sheet 500 may be perpendicular to the liquid crystal display panel 100 to display the light in a liquid crystal display. It serves to condense toward the panel 100. In this case, a pattern may be formed on the upper and lower portions of the prism sheet 600 to collect and diffuse light, and may further include a protective sheet (not shown) to protect the surface of the prism sheet 600. . Of course, the prism sheet 600 may be provided as one sheet.

The accommodating member 3000 serves to accommodate the display assembly 1000 and the backlight assembly 2000, and includes mold frames 700 and 800, an upper chassis 920, and a lower chassis 910.

The mold frame includes a middle mold frame 700 and a side mold frame 800. The middle mold frame 700 is a rectangular frame of a rectangular parallelepiped having an upper and lower portions open, and a liquid crystal display panel 100 is mounted on an upper portion of the middle mold frame 700, and a backlight is formed inside the middle mold frame 700. The assembly 2000 is received.

The side mold frame 800 serves to receive a part of the light source unit 300. That is, a plurality of light source accommodating grooves 880 are formed on one side of the side mold frame 800 to correspond to the number of lamps 310 so that a part of the light source unit 300 is accommodated. A part of the light source unit 300 is accommodated by

The mold frames 700 and 800 will be described in detail later with reference to the drawings.

In addition, the upper chassis 920 and the lower chassis 910 are upper and lower portions of the middle mold frame 700 to protect the display assembly 1000 and the backlight assembly 2000 housed in the middle mold frame 700. Combined with.

Meanwhile, as shown in FIG. 3, the middle mold frame 700 includes a flat portion 710 and a sidewall portion 720 bent downward from the flat portion 710. A rib 730 extending inwardly of the middle mold frame 700 is formed on an inner side of the flat portion 710 so that the liquid crystal display panel 100 is seated on the rib 730. In this case, a plurality of hollows 740 are formed in the ribs 730 and the planar portion 710 of the middle mold frame 700, and the plurality of hollows 740 are rectangular frames of the middle mold frame 700. It is formed along the inside.

The hollow 740 is formed in a circular shape, the diameter (A) of the diameter of the hollow is preferably 10 to 50 micrometers. This is because the size (A) of the hollow diameter should be 10 to 50 micrometers to ensure thermal conductivity and to prevent mechanical properties.

Air is inserted into the hollow 740 to form an air layer by injection molding the middle mold frame 700. That is, the air layer existing inside the hollow 740 blocks heat generated from the light source 300 from being transferred to the rib 730 and the planar portion 710 of the middle mold frame 700. Heat may be prevented from being transferred to the liquid crystal display panel 100 mounted on the rib 730 and the planar portion 710 of the middle mold frame 700.

In the above, the hollow 740 formed in the middle mold frame 700 is formed in a circular shape, but is not limited thereto. The hollow 740 may be formed as a triangle, a quadrangle, or another polygon, and may be formed in combination with each other. Thus, the shape of the hollow 740 may be a variety of shapes without departing from the object of the present invention.

Although the hollow 740 is illustrated as being formed in the rib 730 and the planar portion 710 of the middle mold frame 700, the hollow 740 may be formed in the rib 730 or the planar portion 710, respectively. It may be formed on the side wall portion 720 of the frame 700.

In addition, in the above, although the air layer is formed by inserting air into the hollow 740, the middle mold frame 700 may be injection-molded by forming a gas layer or a fluid layer by inserting gas or fluid in a critical state, respectively.

Meanwhile, the hollow 870 may be formed in the side mold frame 800 to block heat generated from the light source unit 300.

That is, as shown in FIG. 4, the side mold frame 800 faces the first sidewall 810 and the second sidewall facing the first sidewall 810 and smaller than the length of the first sidewall 810. 820, a first planar portion 830 connecting one end of the first sidewall 810 and the second sidewall 820, and a second planar portion 840 connected to the other end of the second sidewall 820. ), An inclined portion 850 connected to the second planar portion 840, and a third sidewall 860 formed to be parallel to the first sidewall 810 from the inclined portion 850.

A plurality of hollows 870 are formed in the inclined portion 850, and the hollow 870 is formed in the left and right directions inside the inclined portion 850. The hollow 870 is formed in a circular shape, the size (B) of the diameter inside the hollow is preferably 10 to 50 micrometers. In addition, air is inserted into the hollow 870 to form an air layer.

Accordingly, the air layer prevents heat generated from the light source 300 from being transferred to the inside of the backlight assembly 2000, thereby more effectively preventing heat from being transferred to the liquid crystal display panel 100. . In addition, since the light generated inside the backlight assembly 2000 is reflected along the air layer, the reflection efficiency may be increased to increase the luminance of the light provided to the liquid crystal display panel 100.

In this case, the gas layer and the fluid layer may be formed in place of the air layer to form a gas layer and the fluid layer. In addition, the hollow 870 may include the first planar part 830 and the in addition to the inclined part 850 of the side mold frame 800. Of course, the second planar portion 840 and the first to third sidewalls 810, 820, and 860 may also be formed.

In the above description, the middle mold frame 700 and the side mold frame 800 are separately described, but the middle mold frame 700 and the side mold frame 800 may be integrally formed.

In the above description, the mold frames 700 and 800 applied to the backlight assembly 2000 to which the direct type light source is mounted have been described, but may be applied to the mold frame of the backlight assembly to which the edge type light source is mounted.

5 is an exploded perspective view illustrating a liquid crystal display according to a second embodiment of the present invention, and FIG. 6 is a cross-sectional view illustrating a liquid crystal display according to the second embodiment of the present invention. In this case, the liquid crystal display according to the second exemplary embodiment is the same as the first exemplary embodiment except that the light source of the backlight assembly is an edge type, and thus the same configuration is omitted.

That is, as shown in FIGS. 5 and 6, the liquid crystal display of the present invention includes a display assembly 1000, a backlight assembly 2000 disposed below the display assembly 1000, and the display assembly 1000. ) And a mold frame 700, an upper chassis 920, and a lower chassis 910 for receiving the backlight assembly 2000.

The backlight assembly 2000 may include a light source unit 350, a light guide plate 360 coupled to the light source unit 350, a reflector plate 400 disposed below the light guide plate 360, and an upper portion of the light guide plate 360. And a plurality of optical sheets 500, 600.

That is, the light source unit 350 includes a lamp 330 and a lamp cover 340, and is positioned on at least one side of the light guide plate 360. As the lamp 330, an electroluminescent lamp (EL), a light emitting diode (LED), a cold cathode fluorescent lamp, or the like may be used. Of these, a cold cathode fluorescent lamp may be used. In addition, the lamp cover 340 is an elliptical shape having an opening on one side, and is surrounded in a form surrounding three surfaces of the lamp 330, thereby reflecting light generated from the lamp 330 in one direction.

In the drawing, the light source unit 350 is installed on one side of the light guide plate 360, but may be installed on both sides of the light guide plate 360.

The light guide plate 360 has a rectangular parallelepiped plate shape and serves to change light having a light distribution in the form of a point light source or a linear light source from the light source unit 350 to light having a light distribution in the form of a surface light source.

As illustrated in FIG. 6, the mold frame 700 includes a flat portion 710 and a sidewall portion 720 bent downward from the flat portion 710. A rib 730 extending inwardly of the mold frame 700 is formed on an inner side of the flat portion 710, and the liquid crystal display panel 100 is seated on the rib 730.

A plurality of hollows 740 are formed in the rib 730 and the planar portion 710 of the mold frame 700, and the hollows 740 are formed along the inside of the rectangular frame of the mold frame 700. . At this time, the hollow 740 may be formed in the side wall portion 720 in addition to the rib 730 and the flat portion 710. In addition, an air layer may be formed by inserting air into the hollow 740, and a gas layer or a fluid layer may be formed by inserting a gas or a fluid in a critical state, respectively.

Therefore, the air layer can effectively prevent the heat generated from the light source unit 350 from being transferred to the liquid crystal display panel 100.

That is, when the hollow layer 740 is formed in the mold frame 700 to form an air layer, the temperature of the liquid crystal display panel 100 of the present invention is 0.165 W / mK, compared to the conventional liquid crystal display panel having a temperature of 0.22 W / mK. It can be seen that the measurement is about 1 degree drop. This is a product such as a large monitor or television, because the reliability evaluation is made by a difference of 1 to 2 degrees, it can be seen that the above configuration has excellent heat dissipation effect.

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 within the scope without departing from the spirit of the invention described in the claims below. I can understand.

As described above, the mold frame of the present invention and the liquid crystal display device having the same form a plurality of hollows in the middle mold frame and the side mold frame. Therefore, the present invention has an effect of preventing the light generated from the light source unit from being transmitted to the liquid crystal display panel.

In addition, the present invention has the effect of forming a plurality of hollows in the side mold frame to block heat generated from the light source unit and increase reflection efficiency to increase the luminance of light provided to the liquid crystal display panel.

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 (10)

A flat part in the form of a square frame, A rib formed to protrude horizontally into the planar portion; A sidewall portion bent vertically downward from the outside of the planar portion, Mold frame, characterized in that the hollow is formed inside at least one of the planar portion, rib and side wall portion. The mold frame of claim 1, wherein the hollow includes any one of air, gas, and fluid. The mold frame according to claim 2, wherein the hollow size is 10 to 50 micrometers. A liquid crystal display panel, A backlight assembly including a light source unit for providing light to the liquid crystal display panel, an optical sheet for providing a path of light generated from the light source unit, A liquid crystal display panel is mounted on the upper portion, and includes a mold frame for receiving the backlight assembly. And a plurality of hollows formed in the mold frame. The method according to claim 4, wherein the mold frame includes a planar portion of a rectangular frame shape, ribs protruding horizontally inwardly of the planar portion, and the sidewall portion vertically bent from the outside of the planar portion to the bottom, And a hollow formed in at least one of the planar portion, the rib, and the sidewall portion. The liquid crystal display of claim 5, further comprising a side mold frame accommodating a portion of the light source unit, wherein a hollow is formed in the side mold frame. The apparatus of claim 6, wherein the side mold frame comprises a first sidewall, a second sidewall facing the first sidewall and smaller than a length of the first sidewall, and a first sidewall connecting one end of the first sidewall and the second sidewall. A planar portion, a second planar portion connected to the other end of the second sidewall, an inclined portion connected to the second planar portion, and a third sidewall formed to be parallel to the first sidewall from the inclined portion, wherein the inclined portion A hollow is formed in the liquid crystal display device. The liquid crystal display of claim 5, further comprising a light guide plate coupled to one side of the light source unit. The liquid crystal display device according to claim 7, wherein the hollow size is 10 to 50 micrometers. The liquid crystal display device according to any one of claims 4 to 9, wherein the hollow includes any one of air, gas, and fluid.

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